[llvm-branch-commits] [llvm] Update transformations sensitive to signaling NaNs (PR #199557)
Serge Pavlov via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Mon May 25 10:26:37 PDT 2026
https://github.com/spavloff created https://github.com/llvm/llvm-project/pull/199557
Previously exception handling behavior was uses as an indicator of sNaN support. With introducing a special function attribute `signaling_nans` the checks for sNaN support must be changed to use the function attribute rather than the exception behavior.
>From cef112e8c0c16dc1af3b161f2b67d5b36591feb5 Mon Sep 17 00:00:00 2001
From: Serge Pavlov <sepavloff at gmail.com>
Date: Thu, 21 May 2026 00:59:28 +0700
Subject: [PATCH] Update transformations sensitive to signaling NaNs
Previously exception handling behavior was uses as an indicator of sNaN
support. With introducing a special function attribute `signaling_nans`
the checks for sNaN support must be changed to use the function
attribute rather than the exception behavior.
---
llvm/include/llvm/Analysis/SimplifyQuery.h | 8 +
llvm/include/llvm/IR/FPEnv.h | 6 -
llvm/lib/Analysis/InstructionSimplify.cpp | 38 +--
.../Transforms/InstSimplify/fdiv-strictfp.ll | 28 ++
.../floating-point-arithmetic-strictfp.ll | 28 ++
.../Transforms/InstSimplify/strictfp-fadd.ll | 133 ++++++++-
.../Transforms/InstSimplify/strictfp-fsub.ll | 252 ++++++++++++++++--
7 files changed, 436 insertions(+), 57 deletions(-)
diff --git a/llvm/include/llvm/Analysis/SimplifyQuery.h b/llvm/include/llvm/Analysis/SimplifyQuery.h
index b81b1dae27471..9a605ea9ed3a4 100644
--- a/llvm/include/llvm/Analysis/SimplifyQuery.h
+++ b/llvm/include/llvm/Analysis/SimplifyQuery.h
@@ -126,6 +126,14 @@ struct SimplifyQuery {
/// Otherwise always return false.
LLVM_ABI bool isUndefValue(Value *V) const;
+ bool expectsSignalingNaNs() const {
+ if (CxtI)
+ if (const BasicBlock *BB = CxtI->getParent())
+ if (const Function *F = BB->getParent())
+ return F->hasFnAttribute(Attribute::SignalingNans);
+ return false;
+ }
+
SimplifyQuery getWithoutDomCondCache() const {
SimplifyQuery Copy(*this);
Copy.DC = nullptr;
diff --git a/llvm/include/llvm/IR/FPEnv.h b/llvm/include/llvm/IR/FPEnv.h
index 38395b15c8c09..a3b7d1c26972d 100644
--- a/llvm/include/llvm/IR/FPEnv.h
+++ b/llvm/include/llvm/IR/FPEnv.h
@@ -80,11 +80,5 @@ LLVM_ABI Intrinsic::ID getConstrainedIntrinsicID(const Instruction &Instr);
inline bool canRoundingModeBe(RoundingMode RM, RoundingMode QRM) {
return RM == QRM || RM == RoundingMode::Dynamic;
}
-
-/// Returns true if the possibility of a signaling NaN can be safely
-/// ignored.
-inline bool canIgnoreSNaN(fp::ExceptionBehavior EB, FastMathFlags FMF) {
- return (EB == fp::ebIgnore || FMF.noNaNs());
-}
}
#endif
diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index 4780c18bec421..956b2447d53ed 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -94,6 +94,10 @@ static Constant *getFalse(Type *Ty) { return ConstantInt::getFalse(Ty); }
/// with every element true.
static Constant *getTrue(Type *Ty) { return ConstantInt::getTrue(Ty); }
+inline bool canIgnoreSNaN(const SimplifyQuery &Q, FastMathFlags FMF) {
+ return !Q.expectsSignalingNaNs() || FMF.noNaNs();
+}
+
/// isSameCompare - Is V equivalent to the comparison "LHS Pred RHS"?
static bool isSameCompare(Value *V, CmpPredicate Pred, Value *LHS, Value *RHS) {
CmpInst *Cmp = dyn_cast<CmpInst>(V);
@@ -5935,14 +5939,14 @@ simplifyFAddInst(Value *Op0, Value *Op1, FastMathFlags FMF,
// not simplify to Op0:
// fadd SNaN, -0.0 --> QNaN
// fadd +0.0, -0.0 --> -0.0 (but only with round toward negative)
- if (canIgnoreSNaN(ExBehavior, FMF) &&
+ if (canIgnoreSNaN(Q, FMF) &&
(!canRoundingModeBe(Rounding, RoundingMode::TowardNegative) ||
FMF.noSignedZeros()))
if (match(Op1, m_NegZeroFP()))
return Op0;
// fadd X, 0 ==> X, when we know X is not -0
- if (canIgnoreSNaN(ExBehavior, FMF))
+ if (canIgnoreSNaN(Q, FMF))
if (match(Op1, m_PosZeroFP()) &&
(FMF.noSignedZeros() || cannotBeNegativeZero(Op0, Q)))
return Op0;
@@ -5997,14 +6001,14 @@ simplifyFSubInst(Value *Op0, Value *Op1, FastMathFlags FMF,
return C;
// fsub X, +0 ==> X
- if (canIgnoreSNaN(ExBehavior, FMF) &&
+ if (canIgnoreSNaN(Q, FMF) &&
(!canRoundingModeBe(Rounding, RoundingMode::TowardNegative) ||
FMF.noSignedZeros()))
if (match(Op1, m_PosZeroFP()))
return Op0;
// fsub X, -0 ==> X, when we know X is not -0
- if (canIgnoreSNaN(ExBehavior, FMF))
+ if (canIgnoreSNaN(Q, FMF))
if (match(Op1, m_NegZeroFP()) &&
(FMF.noSignedZeros() || cannotBeNegativeZero(Op0, Q)))
return Op0;
@@ -6012,13 +6016,13 @@ simplifyFSubInst(Value *Op0, Value *Op1, FastMathFlags FMF,
// fsub -0.0, (fsub -0.0, X) ==> X
// fsub -0.0, (fneg X) ==> X
Value *X;
- if (canIgnoreSNaN(ExBehavior, FMF))
+ if (canIgnoreSNaN(Q, FMF))
if (match(Op0, m_NegZeroFP()) && match(Op1, m_FNeg(m_Value(X))))
return X;
// fsub 0.0, (fsub 0.0, X) ==> X if signed zeros are ignored.
// fsub 0.0, (fneg X) ==> X if signed zeros are ignored.
- if (canIgnoreSNaN(ExBehavior, FMF))
+ if (canIgnoreSNaN(Q, FMF))
if (FMF.noSignedZeros() && match(Op0, m_AnyZeroFP()) &&
(match(Op1, m_FSub(m_AnyZeroFP(), m_Value(X))) ||
match(Op1, m_FNeg(m_Value(X)))))
@@ -6058,16 +6062,18 @@ static Value *simplifyFMAFMul(Value *Op0, Value *Op1, FastMathFlags FMF,
if (Constant *C = simplifyFPOp({Op0, Op1}, FMF, Q, ExBehavior, Rounding))
return C;
- if (!isDefaultFPEnvironment(ExBehavior, Rounding))
- return nullptr;
-
// Canonicalize special constants as operand 1.
if (match(Op0, m_FPOne()) || match(Op0, m_AnyZeroFP()))
std::swap(Op0, Op1);
// X * 1.0 --> X
- if (match(Op1, m_FPOne()))
- return Op0;
+ // except: SNaN * 1.0 -> QNaN
+ if (canIgnoreSNaN(Q, FMF))
+ if (match(Op1, m_FPOne()))
+ return Op0;
+
+ if (!isDefaultFPEnvironment(ExBehavior, Rounding))
+ return nullptr;
if (match(Op1, m_AnyZeroFP())) {
// X * 0.0 --> 0.0 (with nnan and nsz)
@@ -6158,13 +6164,15 @@ simplifyFDivInst(Value *Op0, Value *Op1, FastMathFlags FMF,
if (Constant *C = simplifyFPOp({Op0, Op1}, FMF, Q, ExBehavior, Rounding))
return C;
+ // X / 1.0 -> X
+ // except: SNaN / 1.0 -> QNaN
+ if (canIgnoreSNaN(Q, FMF))
+ if (match(Op1, m_FPOne()))
+ return Op0;
+
if (!isDefaultFPEnvironment(ExBehavior, Rounding))
return nullptr;
- // X / 1.0 -> X
- if (match(Op1, m_FPOne()))
- return Op0;
-
// 0 / X -> 0
// Requires that NaNs are off (X could be zero) and signed zeroes are
// ignored (X could be positive or negative, so the output sign is unknown).
diff --git a/llvm/test/Transforms/InstSimplify/fdiv-strictfp.ll b/llvm/test/Transforms/InstSimplify/fdiv-strictfp.ll
index a0fd8fe74bc67..de753adce84c2 100644
--- a/llvm/test/Transforms/InstSimplify/fdiv-strictfp.ll
+++ b/llvm/test/Transforms/InstSimplify/fdiv-strictfp.ll
@@ -84,6 +84,33 @@ define <2 x float> @fmul_fdiv_common_operand_commute_vec(<2 x float> %x, <2 x fl
ret <2 x float> %d
}
+define float @fmul_fdiv_unity(float %x) #0 {
+; CHECK-LABEL: @fmul_fdiv_unity(
+; CHECK-NEXT: ret float [[X:%.*]]
+;
+ %fdiv = call float @llvm.experimental.constrained.fdiv.f32(float %x, float 1.0, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %fdiv
+}
+
+define float @fmul_fdiv_unity_signaling(float %x) #1 {
+; CHECK-LABEL: @fmul_fdiv_unity_signaling(
+; CHECK-NEXT: [[FDIV:%.*]] = call float @llvm.experimental.constrained.fdiv.f32(float [[X:%.*]], float 1.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[FDIV]]
+;
+ %fdiv = call float @llvm.experimental.constrained.fdiv.f32(float %x, float 1.0, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %fdiv
+}
+
+define float @fmul_fdiv_unity_signaling_nnan(float %x) #1 {
+; CHECK-LABEL: @fmul_fdiv_unity_signaling_nnan(
+; CHECK-NEXT: ret float [[X:%.*]]
+;
+ %fdiv = call nnan float @llvm.experimental.constrained.fdiv.f32(float %x, float 1.0, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %fdiv
+}
+
+
+
declare double @llvm.experimental.constrained.fmul.f64(double, double, metadata, metadata) #0
declare <2 x float> @llvm.experimental.constrained.fmul.v2f32(<2 x float>, <2 x float>, metadata, metadata) #0
@@ -94,4 +121,5 @@ declare <2 x float> @llvm.experimental.constrained.fdiv.v2f32(<2 x float>, <2 x
declare float @llvm.experimental.constrained.frem.f32(float, float, metadata, metadata) #0
attributes #0 = { strictfp }
+attributes #1 = { signaling_nans strictfp }
diff --git a/llvm/test/Transforms/InstSimplify/floating-point-arithmetic-strictfp.ll b/llvm/test/Transforms/InstSimplify/floating-point-arithmetic-strictfp.ll
index 9a078a8f569da..e8082906dfce4 100644
--- a/llvm/test/Transforms/InstSimplify/floating-point-arithmetic-strictfp.ll
+++ b/llvm/test/Transforms/InstSimplify/floating-point-arithmetic-strictfp.ll
@@ -514,6 +514,33 @@ define float @maxnum_with_pos_one_op(float %a) #0 {
ret float %fabs
}
+define float @fmul_unity(float %x) #0 {
+; CHECK-LABEL: @fmul_unity(
+; CHECK-NEXT: [[FMUL:%.*]] = call float @llvm.experimental.constrained.fmul.f32(float [[X:%.*]], float 1.000000e+00, metadata !"round.dynamic", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[X]]
+;
+ %fmul = call float @llvm.experimental.constrained.fmul.f32(float %x, float 1.0, metadata !"round.dynamic", metadata !"fpexcept.strict")
+ ret float %fmul
+}
+
+define float @fmul_unity_signaling(float %x) #1 {
+; CHECK-LABEL: @fmul_unity_signaling(
+; CHECK-NEXT: [[FMUL:%.*]] = call float @llvm.experimental.constrained.fmul.f32(float [[X:%.*]], float 1.000000e+00, metadata !"round.dynamic", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[FMUL]]
+;
+ %fmul = call float @llvm.experimental.constrained.fmul.f32(float %x, float 1.0, metadata !"round.dynamic", metadata !"fpexcept.strict")
+ ret float %fmul
+}
+
+define float @fmul_unity_signaling_nnan(float %x) #1 {
+; CHECK-LABEL: @fmul_unity_signaling_nnan(
+; CHECK-NEXT: [[FMUL:%.*]] = call nnan float @llvm.experimental.constrained.fmul.f32(float [[X:%.*]], float 1.000000e+00, metadata !"round.dynamic", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[X]]
+;
+ %fmul = call nnan float @llvm.experimental.constrained.fmul.f32(float %x, float 1.0, metadata !"round.dynamic", metadata !"fpexcept.strict")
+ ret float %fmul
+}
+
declare float @llvm.fabs.f32(float)
declare <2 x float> @llvm.fabs.v2f32(<2 x float>)
@@ -532,3 +559,4 @@ declare float @llvm.experimental.constrained.maxnum.f32(float, float, metadata)
declare float @llvm.experimental.constrained.sqrt.f32(float, metadata, metadata)
attributes #0 = { strictfp }
+attributes #1 = { signaling_nans strictfp }
diff --git a/llvm/test/Transforms/InstSimplify/strictfp-fadd.ll b/llvm/test/Transforms/InstSimplify/strictfp-fadd.ll
index bfc7c038322d4..2c3299eb12599 100644
--- a/llvm/test/Transforms/InstSimplify/strictfp-fadd.ll
+++ b/llvm/test/Transforms/InstSimplify/strictfp-fadd.ll
@@ -17,6 +17,15 @@ define float @fadd_x_n0_defaultenv(float %a) #0 {
ret float %ret
}
+define float @fadd_x_n0_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fadd_x_n0_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[A1:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0:[0-9]+]]
+; CHECK-NEXT: ret float [[A]]
+;
+ %ret = call float @llvm.experimental.constrained.fadd.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
define <2 x float> @fadd_vec_x_n0_defaultenv(<2 x float> %a) #0 {
; CHECK-LABEL: @fadd_vec_x_n0_defaultenv(
; CHECK-NEXT: ret <2 x float> [[A:%.*]]
@@ -25,10 +34,18 @@ define <2 x float> @fadd_vec_x_n0_defaultenv(<2 x float> %a) #0 {
ret <2 x float> %ret
}
+define <2 x float> @fadd_vec_x_n0_defaultenv_signaling(<2 x float> %a) #1 {
+; CHECK-LABEL: @fadd_vec_x_n0_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A1:%.*]], <2 x float> splat (float -0.000000e+00), metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret <2 x float> [[A]]
+;
+ %ret = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float><float -0.0, float -0.0>, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret <2 x float> %ret
+}
+
define float @fadd_x_n0_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fadd_x_n0_ebmaytrap(
-; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0:[0-9]+]]
-; CHECK-NEXT: ret float [[RET]]
+; CHECK-NEXT: ret float [[RET:%.*]]
;
%ret = call float @llvm.experimental.constrained.fadd.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
ret float %ret
@@ -36,8 +53,7 @@ define float @fadd_x_n0_ebmaytrap(float %a) #0 {
define <2 x float> @fadd_vec_x_n0_ebmaytrap(<2 x float> %a) #0 {
; CHECK-LABEL: @fadd_vec_x_n0_ebmaytrap(
-; CHECK-NEXT: [[RET:%.*]] = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A:%.*]], <2 x float> splat (float -0.000000e+00), metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
-; CHECK-NEXT: ret <2 x float> [[RET]]
+; CHECK-NEXT: ret <2 x float> [[RET:%.*]]
;
%ret = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float><float -0.0, float -0.0>, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
ret <2 x float> %ret
@@ -45,7 +61,7 @@ define <2 x float> @fadd_vec_x_n0_ebmaytrap(<2 x float> %a) #0 {
define float @fadd_x_n0_ebstrict(float %a) #0 {
; CHECK-LABEL: @fadd_x_n0_ebstrict(
-; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET1:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[RET:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
; CHECK-NEXT: ret float [[RET]]
;
%ret = call float @llvm.experimental.constrained.fadd.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
@@ -54,7 +70,7 @@ define float @fadd_x_n0_ebstrict(float %a) #0 {
define <2 x float> @fadd_vec_x_n0_ebstrict(<2 x float> %a) #0 {
; CHECK-LABEL: @fadd_vec_x_n0_ebstrict(
-; CHECK-NEXT: [[RET:%.*]] = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A:%.*]], <2 x float> splat (float -0.000000e+00), metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET1:%.*]] = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[RET:%.*]], <2 x float> splat (float -0.000000e+00), metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
; CHECK-NEXT: ret <2 x float> [[RET]]
;
%ret = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float><float -0.0, float -0.0>, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
@@ -107,6 +123,15 @@ define float @fadd_x_n0_towardzero(float %a) #0 {
ret float %ret
}
+define float @fadd_x_n0_towardzero_signaling(float %a) #1 {
+; CHECK-LABEL: @fadd_x_n0_towardzero_signaling(
+; CHECK-NEXT: [[A:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[A1:%.*]], float -0.000000e+00, metadata !"round.towardzero", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[A]]
+;
+ %ret = call float @llvm.experimental.constrained.fadd.f32(float %a, float -0.0, metadata !"round.towardzero", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
; The rounding mode here needs to not be { tonearest, downward, dynamic }.
; Test one of the remaining rounding modes and the rest will be fine.
define <2 x float> @fadd_vec_x_n0_towardzero(<2 x float> %a) #0 {
@@ -117,6 +142,15 @@ define <2 x float> @fadd_vec_x_n0_towardzero(<2 x float> %a) #0 {
ret <2 x float> %ret
}
+define <2 x float> @fadd_vec_x_n0_towardzero_signaling(<2 x float> %a) #1 {
+; CHECK-LABEL: @fadd_vec_x_n0_towardzero_signaling(
+; CHECK-NEXT: [[A:%.*]] = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A1:%.*]], <2 x float> splat (float -0.000000e+00), metadata !"round.towardzero", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret <2 x float> [[A]]
+;
+ %ret = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float><float -0.0, float -0.0>, metadata !"round.towardzero", metadata !"fpexcept.ignore") #0
+ ret <2 x float> %ret
+}
+
define float @fadd_nnan_x_n0_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fadd_nnan_x_n0_ebmaytrap(
; CHECK-NEXT: ret float [[A:%.*]]
@@ -154,7 +188,7 @@ define <2 x float> @fadd_vec_nnan_x_n0_ebstrict(<2 x float> %a) #0 {
; Test with a fast math flag set but that flag is not "nnan".
define float @fadd_ninf_x_n0_ebstrict(float %a) #0 {
; CHECK-LABEL: @fadd_ninf_x_n0_ebstrict(
-; CHECK-NEXT: [[RET:%.*]] = call ninf float @llvm.experimental.constrained.fadd.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET1:%.*]] = call ninf float @llvm.experimental.constrained.fadd.f32(float [[RET:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
; CHECK-NEXT: ret float [[RET]]
;
%ret = call ninf float @llvm.experimental.constrained.fadd.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
@@ -164,7 +198,7 @@ define float @fadd_ninf_x_n0_ebstrict(float %a) #0 {
; Test with a fast math flag set but that flag is not "nnan".
define <2 x float> @fadd_vec_ninf_x_n0_ebstrict(<2 x float> %a) #0 {
; CHECK-LABEL: @fadd_vec_ninf_x_n0_ebstrict(
-; CHECK-NEXT: [[RET:%.*]] = call ninf <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A:%.*]], <2 x float> splat (float -0.000000e+00), metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET1:%.*]] = call ninf <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[RET:%.*]], <2 x float> splat (float -0.000000e+00), metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
; CHECK-NEXT: ret <2 x float> [[RET]]
;
%ret = call ninf <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float><float -0.0, float -0.0>, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
@@ -179,6 +213,15 @@ define float @fadd_n0_x_defaultenv(float %a) #0 {
ret float %ret
}
+define float @fadd_n0_x_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fadd_n0_x_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float -0.000000e+00, float [[A1:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[A]]
+;
+ %ret = call float @llvm.experimental.constrained.fadd.f32(float -0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
define <2 x float> @fadd_vec_n0_x_defaultenv(<2 x float> %a) #0 {
; CHECK-LABEL: @fadd_vec_n0_x_defaultenv(
; CHECK-NEXT: ret <2 x float> [[A:%.*]]
@@ -187,6 +230,15 @@ define <2 x float> @fadd_vec_n0_x_defaultenv(<2 x float> %a) #0 {
ret <2 x float> %ret
}
+define <2 x float> @fadd_vec_n0_x_defaultenv_signaling(<2 x float> %a) #1 {
+; CHECK-LABEL: @fadd_vec_n0_x_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> splat (float -0.000000e+00), <2 x float> [[A1:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret <2 x float> [[A]]
+;
+ %ret = call <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float><float -0.0, float -0.0>, <2 x float> %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret <2 x float> %ret
+}
+
; TODO: Canonicalize the order of the arguments. Then this will fire.
define float @fadd_n0_x_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fadd_n0_x_ebmaytrap(
@@ -219,6 +271,15 @@ define float @fold_fadd_nsz_x_0_defaultenv(float %a) #0 {
ret float %add
}
+define float @fold_fadd_nsz_x_0_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fadd_nsz_x_0_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fadd.f32(float [[A1:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[A]]
+;
+ %add = call nsz float @llvm.experimental.constrained.fadd.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %add
+}
+
define <2 x float> @fold_fadd_vec_nsz_x_0_defaultenv(<2 x float> %a) #0 {
; CHECK-LABEL: @fold_fadd_vec_nsz_x_0_defaultenv(
; CHECK-NEXT: ret <2 x float> [[A:%.*]]
@@ -227,6 +288,15 @@ define <2 x float> @fold_fadd_vec_nsz_x_0_defaultenv(<2 x float> %a) #0 {
ret <2 x float> %add
}
+define <2 x float> @fold_fadd_vec_nsz_x_0_defaultenv_signaling(<2 x float> %a) #1 {
+; CHECK-LABEL: @fold_fadd_vec_nsz_x_0_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A1:%.*]], <2 x float> zeroinitializer, metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret <2 x float> [[A]]
+;
+ %add = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float> zeroinitializer, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret <2 x float> %add
+}
+
define float @fold_fadd_nsz_x_0_neginf(float %a) #0 {
; CHECK-LABEL: @fold_fadd_nsz_x_0_neginf(
; CHECK-NEXT: ret float [[A:%.*]]
@@ -235,6 +305,15 @@ define float @fold_fadd_nsz_x_0_neginf(float %a) #0 {
ret float %add
}
+define float @fold_fadd_nsz_x_0_neginf_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fadd_nsz_x_0_neginf_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fadd.f32(float [[A1:%.*]], float 0.000000e+00, metadata !"round.downward", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[A]]
+;
+ %add = call nsz float @llvm.experimental.constrained.fadd.f32(float %a, float 0.0, metadata !"round.downward", metadata !"fpexcept.ignore") #0
+ ret float %add
+}
+
define <2 x float> @fold_fadd_vec_nsz_x_0_neginf(<2 x float> %a) #0 {
; CHECK-LABEL: @fold_fadd_vec_nsz_x_0_neginf(
; CHECK-NEXT: ret <2 x float> [[A:%.*]]
@@ -243,10 +322,18 @@ define <2 x float> @fold_fadd_vec_nsz_x_0_neginf(<2 x float> %a) #0 {
ret <2 x float> %add
}
+define <2 x float> @fold_fadd_vec_nsz_x_0_neginf_signaling(<2 x float> %a) #1 {
+; CHECK-LABEL: @fold_fadd_vec_nsz_x_0_neginf_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A1:%.*]], <2 x float> zeroinitializer, metadata !"round.downward", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret <2 x float> [[A]]
+;
+ %add = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float> zeroinitializer, metadata !"round.downward", metadata !"fpexcept.ignore") #0
+ ret <2 x float> %add
+}
+
define float @fold_fadd_nsz_x_0_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fold_fadd_nsz_x_0_ebmaytrap(
-; CHECK-NEXT: [[ADD:%.*]] = call nsz float @llvm.experimental.constrained.fadd.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
-; CHECK-NEXT: ret float [[ADD]]
+; CHECK-NEXT: ret float [[ADD:%.*]]
;
%add = call nsz float @llvm.experimental.constrained.fadd.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
ret float %add
@@ -254,8 +341,7 @@ define float @fold_fadd_nsz_x_0_ebmaytrap(float %a) #0 {
define <2 x float> @fold_fadd_vec_nsz_x_0_ebmaytrap(<2 x float> %a) #0 {
; CHECK-LABEL: @fold_fadd_vec_nsz_x_0_ebmaytrap(
-; CHECK-NEXT: [[ADD:%.*]] = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A:%.*]], <2 x float> zeroinitializer, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
-; CHECK-NEXT: ret <2 x float> [[ADD]]
+; CHECK-NEXT: ret <2 x float> [[ADD:%.*]]
;
%add = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float> zeroinitializer, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
ret <2 x float> %add
@@ -279,7 +365,7 @@ define <2 x float> @fold_fadd_vec_nnan_nsz_x_0_ebmaytrap(<2 x float> %a) #0 {
define float @fold_fadd_nsz_x_0_ebstrict(float %a) #0 {
; CHECK-LABEL: @fold_fadd_nsz_x_0_ebstrict(
-; CHECK-NEXT: [[ADD:%.*]] = call nsz float @llvm.experimental.constrained.fadd.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[ADD1:%.*]] = call nsz float @llvm.experimental.constrained.fadd.f32(float [[ADD:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
; CHECK-NEXT: ret float [[ADD]]
;
%add = call nsz float @llvm.experimental.constrained.fadd.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
@@ -288,7 +374,7 @@ define float @fold_fadd_nsz_x_0_ebstrict(float %a) #0 {
define <2 x float> @fold_fadd_vec_nsz_x_0_ebstrict(<2 x float> %a) #0 {
; CHECK-LABEL: @fold_fadd_vec_nsz_x_0_ebstrict(
-; CHECK-NEXT: [[ADD:%.*]] = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[A:%.*]], <2 x float> zeroinitializer, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[ADD1:%.*]] = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> [[ADD:%.*]], <2 x float> zeroinitializer, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
; CHECK-NEXT: ret <2 x float> [[ADD]]
;
%add = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> %a, <2 x float> zeroinitializer, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
@@ -321,6 +407,15 @@ define float @fold_fadd_nsz_0_x_defaultenv(float %a) #0 {
ret float %add
}
+define float @fold_fadd_nsz_0_x_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fadd_nsz_0_x_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fadd.f32(float 0.000000e+00, float [[A1:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[A]]
+;
+ %add = call nsz float @llvm.experimental.constrained.fadd.f32(float 0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %add
+}
+
define <2 x float> @fold_fadd_vec_nsz_0_x_defaultenv(<2 x float> %a) #0 {
; CHECK-LABEL: @fold_fadd_vec_nsz_0_x_defaultenv(
; CHECK-NEXT: ret <2 x float> [[A:%.*]]
@@ -329,6 +424,15 @@ define <2 x float> @fold_fadd_vec_nsz_0_x_defaultenv(<2 x float> %a) #0 {
ret <2 x float> %add
}
+define <2 x float> @fold_fadd_vec_nsz_0_x_defaultenv_signaling(<2 x float> %a) #1 {
+; CHECK-LABEL: @fold_fadd_vec_nsz_0_x_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> zeroinitializer, <2 x float> [[A1:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret <2 x float> [[A]]
+;
+ %add = call nsz <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float> zeroinitializer, <2 x float> %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret <2 x float> %add
+}
+
; TODO: Canonicalize the order of the arguments. Then this will fire.
define float @fold_fadd_nsz_0_x_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fold_fadd_nsz_0_x_ebmaytrap(
@@ -460,3 +564,4 @@ declare float @llvm.experimental.constrained.fadd.f32(float, float, metadata, me
declare <2 x float> @llvm.experimental.constrained.fadd.v2f32(<2 x float>, <2 x float>, metadata, metadata) #0
attributes #0 = { strictfp }
+attributes #1 = { signaling_nans strictfp }
diff --git a/llvm/test/Transforms/InstSimplify/strictfp-fsub.ll b/llvm/test/Transforms/InstSimplify/strictfp-fsub.ll
index b55519e8374b6..ca493b1f116e3 100644
--- a/llvm/test/Transforms/InstSimplify/strictfp-fsub.ll
+++ b/llvm/test/Transforms/InstSimplify/strictfp-fsub.ll
@@ -9,6 +9,7 @@
; fsub X, +0 ==> X
;
+; Folds: sNaNs are not expected and rounding is not downward.
define float @fsub_x_p0_defaultenv(float %a) #0 {
; CHECK-LABEL: @fsub_x_p0_defaultenv(
; CHECK-NEXT: ret float [[A:%.*]]
@@ -17,16 +18,36 @@ define float @fsub_x_p0_defaultenv(float %a) #0 {
ret float %ret
}
-; Missing nnan: must not fire.
+; Does not fold: sNaNs are possible.
+define float @fsub_x_p0_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_x_p0_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A1:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[A]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %ret
+}
+
+; Folds: sNaNs are not expected and rounding is not downward.
define float @fsub_x_p0_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fsub_x_p0_ebmaytrap(
-; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
-; CHECK-NEXT: ret float [[RET]]
+; CHECK-NEXT: ret float [[RET:%.*]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+ ret float %ret
+}
+
+; Does not fold: sNaNs are possible.
+define float @fsub_x_p0_ebmaytrap_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_x_p0_ebmaytrap_signaling(
+; CHECK-NEXT: [[A:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A1:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+; CHECK-NEXT: ret float [[A]]
;
%ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
ret float %ret
}
+; Folds: sNaNs are not expected and rounding is not downward.
define float @fsub_nnan_x_p0_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fsub_nnan_x_p0_ebmaytrap(
; CHECK-NEXT: ret float [[A:%.*]]
@@ -35,16 +56,27 @@ define float @fsub_nnan_x_p0_ebmaytrap(float %a) #0 {
ret float %ret
}
-; Missing nnan: must not fire.
+; Folds: sNaNs are not expected and rounding is not downward.
define float @fsub_x_p0_ebstrict(float %a) #0 {
; CHECK-LABEL: @fsub_x_p0_ebstrict(
; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[A]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.strict")
+ ret float %ret
+}
+
+; Does not fold: sNaNs are possible.
+define float @fsub_x_p0_ebstrict_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_x_p0_ebstrict_signaling(
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict")
; CHECK-NEXT: ret float [[RET]]
;
%ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.strict")
ret float %ret
}
+; Folds: sNaNs are not expected and rounding is not downward.
; The instruction is expected to remain, but the result isn't used.
define float @fsub_nnan_x_p0_ebstrict(float %a) #0 {
; CHECK-LABEL: @fsub_nnan_x_p0_ebstrict(
@@ -56,9 +88,20 @@ define float @fsub_nnan_x_p0_ebstrict(float %a) #0 {
}
; Test with a fast math flag set but that flag is not "nnan".
+; Folds: sNaNs are not expected and rounding is not downward.
define float @fsub_ninf_x_p0_ebstrict(float %a) #0 {
; CHECK-LABEL: @fsub_ninf_x_p0_ebstrict(
; CHECK-NEXT: [[RET:%.*]] = call ninf float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[A]]
+;
+ %ret = call ninf float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.strict")
+ ret float %ret
+}
+
+; Does not fold: sNaNs are possible.
+define float @fsub_ninf_x_p0_ebstrict_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_ninf_x_p0_ebstrict_signaling(
+; CHECK-NEXT: [[RET:%.*]] = call ninf float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict")
; CHECK-NEXT: ret float [[RET]]
;
%ret = call ninf float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.strict")
@@ -95,6 +138,16 @@ define float @fsub_nsz_x_p0_neginf(float %a) #0 {
ret float %ret
}
+; Does not fold: sNaNs are possible.
+define float @fsub_nsz_x_p0_neginf_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_nsz_x_p0_neginf_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A1:%.*]], float 0.000000e+00, metadata !"round.downward", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[A]]
+;
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.downward", metadata !"fpexcept.ignore")
+ ret float %ret
+}
+
; With nsz we don't have to worry about -0.0 so the transform is valid.
define float @fsub_nsz_x_p0_dynamic(float %a) #0 {
; CHECK-LABEL: @fsub_nsz_x_p0_dynamic(
@@ -104,6 +157,16 @@ define float @fsub_nsz_x_p0_dynamic(float %a) #0 {
ret float %ret
}
+; Does not fold: sNaNs are possible.
+define float @fsub_nsz_x_p0_dynamic_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_nsz_x_p0_dynamic_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A1:%.*]], float 0.000000e+00, metadata !"round.dynamic", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[A]]
+;
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.dynamic", metadata !"fpexcept.ignore")
+ ret float %ret
+}
+
;
; fsub X, -0 ==> X, when we know X is not -0
; (fast math flag: nsz)
@@ -117,11 +180,30 @@ define float @fold_fsub_nsz_x_n0_defaultenv(float %a) #0 {
ret float %sub
}
-; Missing nnan: must not fire.
+; Does not fold: sNaNs are possible.
+define float @fold_fsub_nsz_x_n0_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fsub_nsz_x_n0_defaultenv_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A1:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[A]]
+;
+ %sub = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %sub
+}
+
+; Folds: sNaNs are not expected and nsz.
define float @fold_fsub_nsz_x_n0_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fold_fsub_nsz_x_n0_ebmaytrap(
-; CHECK-NEXT: [[SUB:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
-; CHECK-NEXT: ret float [[SUB]]
+; CHECK-NEXT: ret float [[SUB:%.*]]
+;
+ %sub = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+ ret float %sub
+}
+
+; Does not fold: sNaNs are possible.
+define float @fold_fsub_nsz_x_n0_ebmaytrap_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fsub_nsz_x_n0_ebmaytrap_signaling(
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A1:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+; CHECK-NEXT: ret float [[A]]
;
%sub = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
ret float %sub
@@ -135,10 +217,20 @@ define float @fold_fsub_nnan_nsz_x_n0_ebmaytrap(float %a) #0 {
ret float %sub
}
-; Missing nnan: must not fire.
+; Folds: sNaNs are not expected and nsz.
define float @fold_fsub_nsz_x_n0_ebstrict(float %a) #0 {
; CHECK-LABEL: @fold_fsub_nsz_x_n0_ebstrict(
; CHECK-NEXT: [[SUB:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[A]]
+;
+ %sub = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict")
+ ret float %sub
+}
+
+; Does not fold: sNaNs are possible.
+define float @fold_fsub_nsz_x_n0_ebstrict_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fsub_nsz_x_n0_ebstrict_signaling(
+; CHECK-NEXT: [[SUB:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict")
; CHECK-NEXT: ret float [[SUB]]
;
%sub = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict")
@@ -170,11 +262,22 @@ define float @fold_fsub_fabs_x_n0_defaultenv(float %a) #0 {
ret float %sub
}
-; Missing nnan: must not fire.
+; Does not fold: sNaNs are possible.
+define float @fold_fsub_fabs_x_n0_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fsub_fabs_x_n0_defaultenv_signaling(
+; CHECK-NEXT: [[ABSA1:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]]) #[[ATTR0]]
+; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[ABSA1]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[ABSA]]
+;
+ %absa = call float @llvm.fabs.f32(float %a) #0
+ %sub = call float @llvm.experimental.constrained.fsub.f32(float %absa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %sub
+}
+
+; Folds: sNaNs are not expected and no -0.0.
define float @fold_fsub_fabs_x_n0_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fold_fsub_fabs_x_n0_ebmaytrap(
-; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]]) #[[ATTR0]]
-; CHECK-NEXT: [[SUB:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[ABSA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+; CHECK-NEXT: [[SUB:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]]) #[[ATTR0]]
; CHECK-NEXT: ret float [[SUB]]
;
%absa = call float @llvm.fabs.f32(float %a) #0
@@ -182,6 +285,18 @@ define float @fold_fsub_fabs_x_n0_ebmaytrap(float %a) #0 {
ret float %sub
}
+; Does not fold: sNaNs are possible.
+define float @fold_fsub_fabs_x_n0_ebmaytrap_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fsub_fabs_x_n0_ebmaytrap_signaling(
+; CHECK-NEXT: [[ABSA1:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]]) #[[ATTR0]]
+; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[ABSA1]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+; CHECK-NEXT: ret float [[ABSA]]
+;
+ %absa = call float @llvm.fabs.f32(float %a) #0
+ %sub = call float @llvm.experimental.constrained.fsub.f32(float %absa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+ ret float %sub
+}
+
define float @fold_fsub_fabs_nnan_x_n0_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fold_fsub_fabs_nnan_x_n0_ebmaytrap(
; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]]) #[[ATTR0]]
@@ -192,11 +307,23 @@ define float @fold_fsub_fabs_nnan_x_n0_ebmaytrap(float %a) #0 {
ret float %sub
}
-; Missing nnan: must not fire.
+; Folds: sNaNs are not expected and no -0.0.
define float @fold_fsub_fabs_x_n0_ebstrict(float %a) #0 {
; CHECK-LABEL: @fold_fsub_fabs_x_n0_ebstrict(
; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]]) #[[ATTR0]]
; CHECK-NEXT: [[SUB:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[ABSA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[ABSA]]
+;
+ %absa = call float @llvm.fabs.f32(float %a) #0
+ %sub = call float @llvm.experimental.constrained.fsub.f32(float %absa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict")
+ ret float %sub
+}
+
+; Does not fold: sNaNs are possible.
+define float @fold_fsub_fabs_x_n0_ebstrict_signaling(float %a) #1 {
+; CHECK-LABEL: @fold_fsub_fabs_x_n0_ebstrict_signaling(
+; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]]) #[[ATTR0]]
+; CHECK-NEXT: [[SUB:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[ABSA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict")
; CHECK-NEXT: ret float [[SUB]]
;
%absa = call float @llvm.fabs.f32(float %a) #0
@@ -226,6 +353,18 @@ define float @fold_fsub_sitofp_x_n0_defaultenv(i32 %a) #0 {
ret float %sub
}
+; Does not fold: sNaNs are possible.
+define float @fold_fsub_sitofp_x_n0_defaultenv_signaling(i32 %a) #1 {
+; CHECK-LABEL: @fold_fsub_sitofp_x_n0_defaultenv_signaling(
+; CHECK-NEXT: [[FPA:%.*]] = call float @llvm.experimental.constrained.sitofp.f32.i32(i32 [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore")
+; CHECK-NEXT: [[SUB:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[FPA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %fpa = call float @llvm.experimental.constrained.sitofp.f32.i32(i32 %a, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ %sub = call float @llvm.experimental.constrained.fsub.f32(float %fpa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %sub
+}
+
;
; fsub -0.0, (fneg X) ==> X
;
@@ -239,12 +378,34 @@ define float @fsub_fneg_n0_fnX_defaultenv(float %a) #0 {
ret float %ret
}
-; Missing nnan: must not fire.
+; Does not fold: sNaNs are possible.
+define float @fsub_fneg_n0_fnX_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_fneg_n0_fnX_defaultenv_signaling(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A1:%.*]]
+; CHECK-NEXT: [[A:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[A]]
+;
+ %nega = fneg float %a
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %ret
+}
+
+; Folds: sNaNs are not expected and subtrahend is fneg.
define float @fsub_fneg_n0_fnX_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fsub_fneg_n0_fnX_ebmaytrap(
-; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
-; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap")
-; CHECK-NEXT: ret float [[RET]]
+; CHECK-NEXT: ret float [[RET:%.*]]
+;
+ %nega = fneg float %a
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+ ret float %ret
+}
+
+; Does not fold: sNaNs are possible.
+define float @fsub_fneg_n0_fnX_ebmaytrap_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_fneg_n0_fnX_ebmaytrap_signaling(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A1:%.*]]
+; CHECK-NEXT: [[A:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+; CHECK-NEXT: ret float [[A]]
;
%nega = fneg float %a
%ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
@@ -260,11 +421,23 @@ define float @fsub_fneg_nnan_n0_fnX_ebmaytrap(float %a) #0 {
ret float %ret
}
-; Missing nnan: must not fire.
+; Folds: sNaNs are not expected and no -0.0.
define float @fsub_fneg_n0_fnX_ebstrict(float %a) #0 {
; CHECK-LABEL: @fsub_fneg_n0_fnX_ebstrict(
; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[A]]
+;
+ %nega = fneg float %a
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict")
+ ret float %ret
+}
+
+; Does not fold: sNaNs are possible.
+define float @fsub_fneg_n0_fnX_ebstrict_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_fneg_n0_fnX_ebstrict_signaling(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict")
; CHECK-NEXT: ret float [[RET]]
;
%nega = fneg float %a
@@ -361,12 +534,34 @@ define float @fsub_fneg_nsz_p0_fnX_defaultenv(float %a) #0 {
ret float %ret
}
-; Missing nnan: must not fire.
+; Does not fold: sNaNs are possible.
+define float @fsub_fneg_nsz_p0_fnX_defaultenv_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_fneg_nsz_p0_fnX_defaultenv_signaling(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A1:%.*]]
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.ignore")
+; CHECK-NEXT: ret float [[A]]
+;
+ %nega = fneg float %a
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.ignore")
+ ret float %ret
+}
+
+; Folds: sNaNs are not expected and nsz.
define float @fsub_fneg_nsz_p0_fnX_ebmaytrap(float %a) #0 {
; CHECK-LABEL: @fsub_fneg_nsz_p0_fnX_ebmaytrap(
-; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
-; CHECK-NEXT: [[RET:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap")
-; CHECK-NEXT: ret float [[RET]]
+; CHECK-NEXT: ret float [[RET:%.*]]
+;
+ %nega = fneg float %a
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+ ret float %ret
+}
+
+; Does not fold: sNaNs are possible.
+define float @fsub_fneg_nsz_p0_fnX_ebmaytrap_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_fneg_nsz_p0_fnX_ebmaytrap_signaling(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A1:%.*]]
+; CHECK-NEXT: [[A:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap")
+; CHECK-NEXT: ret float [[A]]
;
%nega = fneg float %a
%ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
@@ -382,11 +577,23 @@ define float @fsub_fneg_nsz_nnan_p0_fnX_ebmaytrap(float %a) #0 {
ret float %ret
}
-; Missing nnan: must not fire.
+; Folds: sNaNs are not expected and nsz.
define float @fsub_fneg_nsz_p0_fnX_ebstrict(float %a) #0 {
; CHECK-LABEL: @fsub_fneg_nsz_p0_fnX_ebstrict(
; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
; CHECK-NEXT: [[RET:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict")
+; CHECK-NEXT: ret float [[A]]
+;
+ %nega = fneg float %a
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict")
+ ret float %ret
+}
+
+; Does not fold: sNaNs are possible.
+define float @fsub_fneg_nsz_p0_fnX_ebstrict_signaling(float %a) #1 {
+; CHECK-LABEL: @fsub_fneg_nsz_p0_fnX_ebstrict_signaling(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict")
; CHECK-NEXT: ret float [[RET]]
;
%nega = fneg float %a
@@ -723,3 +930,4 @@ declare float @llvm.experimental.constrained.fsub.f32(float, float, metadata, me
declare float @llvm.experimental.constrained.sitofp.f32.i32(i32, metadata, metadata)
attributes #0 = { strictfp }
+attributes #1 = { signaling_nans strictfp }
More information about the llvm-branch-commits
mailing list