[llvm] 3dabcdc - ValueTracking: Implement computeKnownFPClass for llvm.trunc
Matt Arsenault via llvm-commits
llvm-commits at lists.llvm.org
Fri Apr 14 14:41:36 PDT 2023
Author: Matt Arsenault
Date: 2023-04-14T17:41:26-04:00
New Revision: 3dabcdc78b718db8136e27c8bec7b99eeabac5bf
URL: https://github.com/llvm/llvm-project/commit/3dabcdc78b718db8136e27c8bec7b99eeabac5bf
DIFF: https://github.com/llvm/llvm-project/commit/3dabcdc78b718db8136e27c8bec7b99eeabac5bf.diff
LOG: ValueTracking: Implement computeKnownFPClass for llvm.trunc
Added:
Modified:
llvm/include/llvm/Analysis/ValueTracking.h
llvm/lib/Analysis/ValueTracking.cpp
llvm/test/Transforms/Attributor/nofpclass-trunc.ll
Removed:
################################################################################
diff --git a/llvm/include/llvm/Analysis/ValueTracking.h b/llvm/include/llvm/Analysis/ValueTracking.h
index 85c6021eea248..b0fbd87ef7484 100644
--- a/llvm/include/llvm/Analysis/ValueTracking.h
+++ b/llvm/include/llvm/Analysis/ValueTracking.h
@@ -249,6 +249,16 @@ struct KnownFPClass {
return (KnownFPClasses & fcInf) == fcNone;
}
+ /// Return true if it's known this can never be +infinity.
+ bool isKnownNeverPosInfinity() const {
+ return (KnownFPClasses & fcPosInf) == fcNone;
+ }
+
+ /// Return true if it's known this can never be -infinity.
+ bool isKnownNeverNegInfinity() const {
+ return (KnownFPClasses & fcNegInf) == fcNone;
+ }
+
/// Return true if it's known this can never be a subnormal
bool isKnownNeverSubnormal() const {
return (KnownFPClasses & fcSubnormal) == fcNone;
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 51f88945c532a..4a79f52e7a01f 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -4494,6 +4494,25 @@ void computeKnownFPClass(const Value *V, const APInt &DemandedElts,
break;
}
+ case Intrinsic::trunc: {
+ KnownFPClass KnownSrc;
+ computeKnownFPClass(II->getArgOperand(0), DemandedElts,
+ InterestedClasses, KnownSrc, Depth + 1, Q, TLI);
+
+ // Integer results cannot be subnormal.
+ Known.knownNot(fcSubnormal);
+
+ // trunc passes through infinities.
+ if (KnownSrc.isKnownNeverPosInfinity())
+ Known.knownNot(fcPosInf);
+ if (KnownSrc.isKnownNeverNegInfinity())
+ Known.knownNot(fcNegInf);
+
+ // Non-constrained intrinsics do not guarantee signaling nan quieting.
+ if (KnownSrc.isKnownNeverNaN())
+ Known.knownNot(fcNan);
+ break;
+ }
default:
break;
}
diff --git a/llvm/test/Transforms/Attributor/nofpclass-trunc.ll b/llvm/test/Transforms/Attributor/nofpclass-trunc.ll
index 37f128a722d12..ae5c0795eb89d 100644
--- a/llvm/test/Transforms/Attributor/nofpclass-trunc.ll
+++ b/llvm/test/Transforms/Attributor/nofpclass-trunc.ll
@@ -5,9 +5,9 @@ declare float @llvm.trunc.f32(float)
declare ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128)
define float @ret_trunc(float %arg0) {
-; CHECK-LABEL: define float @ret_trunc
+; CHECK-LABEL: define nofpclass(sub) float @ret_trunc
; CHECK-SAME: (float [[ARG0:%.*]]) #[[ATTR1:[0-9]+]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2:[0-9]+]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2:[0-9]+]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -15,9 +15,9 @@ define float @ret_trunc(float %arg0) {
}
define float @ret_trunc_noinf(float nofpclass(inf) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_noinf
+; CHECK-LABEL: define nofpclass(inf sub) float @ret_trunc_noinf
; CHECK-SAME: (float nofpclass(inf) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(inf sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -25,9 +25,9 @@ define float @ret_trunc_noinf(float nofpclass(inf) %arg0) {
}
define float @ret_trunc_nopinf(float nofpclass(pinf) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_nopinf
+; CHECK-LABEL: define nofpclass(pinf sub) float @ret_trunc_nopinf
; CHECK-SAME: (float nofpclass(pinf) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(pinf sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -35,9 +35,9 @@ define float @ret_trunc_nopinf(float nofpclass(pinf) %arg0) {
}
define float @ret_trunc_noninf(float nofpclass(ninf) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_noninf
+; CHECK-LABEL: define nofpclass(ninf sub) float @ret_trunc_noninf
; CHECK-SAME: (float nofpclass(ninf) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(ninf sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -45,9 +45,9 @@ define float @ret_trunc_noninf(float nofpclass(ninf) %arg0) {
}
define float @ret_trunc_nonan(float nofpclass(nan) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_nonan
+; CHECK-LABEL: define nofpclass(nan sub) float @ret_trunc_nonan
; CHECK-SAME: (float nofpclass(nan) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(nan sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -55,9 +55,9 @@ define float @ret_trunc_nonan(float nofpclass(nan) %arg0) {
}
define float @ret_trunc_noqnan(float nofpclass(qnan) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_noqnan
+; CHECK-LABEL: define nofpclass(sub) float @ret_trunc_noqnan
; CHECK-SAME: (float nofpclass(qnan) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -65,9 +65,9 @@ define float @ret_trunc_noqnan(float nofpclass(qnan) %arg0) {
}
define float @ret_trunc_nosnan(float nofpclass(snan) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_nosnan
+; CHECK-LABEL: define nofpclass(sub) float @ret_trunc_nosnan
; CHECK-SAME: (float nofpclass(snan) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -75,9 +75,9 @@ define float @ret_trunc_nosnan(float nofpclass(snan) %arg0) {
}
define float @ret_trunc_nozero(float nofpclass(zero) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_nozero
+; CHECK-LABEL: define nofpclass(sub) float @ret_trunc_nozero
; CHECK-SAME: (float nofpclass(zero) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -85,9 +85,9 @@ define float @ret_trunc_nozero(float nofpclass(zero) %arg0) {
}
define float @ret_trunc_nopzero(float nofpclass(pzero) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_nopzero
+; CHECK-LABEL: define nofpclass(sub) float @ret_trunc_nopzero
; CHECK-SAME: (float nofpclass(pzero) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -95,9 +95,9 @@ define float @ret_trunc_nopzero(float nofpclass(pzero) %arg0) {
}
define float @ret_trunc_nonzero(float nofpclass(nzero) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_nonzero
+; CHECK-LABEL: define nofpclass(sub) float @ret_trunc_nonzero
; CHECK-SAME: (float nofpclass(nzero) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -105,9 +105,9 @@ define float @ret_trunc_nonzero(float nofpclass(nzero) %arg0) {
}
define float @ret_trunc_nonorm(float nofpclass(norm) %arg0) {
-; CHECK-LABEL: define float @ret_trunc_nonorm
+; CHECK-LABEL: define nofpclass(sub) float @ret_trunc_nonorm
; CHECK-SAME: (float nofpclass(norm) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(sub) float @llvm.trunc.f32(float [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret float [[CALL]]
;
%call = call float @llvm.trunc.f32(float %arg0)
@@ -115,9 +115,9 @@ define float @ret_trunc_nonorm(float nofpclass(norm) %arg0) {
}
define ppc_fp128 @ret_trunc_ppcf128(ppc_fp128 %arg0) {
-; CHECK-LABEL: define ppc_fp128 @ret_trunc_ppcf128
+; CHECK-LABEL: define nofpclass(sub) ppc_fp128 @ret_trunc_ppcf128
; CHECK-SAME: (ppc_fp128 [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(sub) ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret ppc_fp128 [[CALL]]
;
%call = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 %arg0)
@@ -125,9 +125,9 @@ define ppc_fp128 @ret_trunc_ppcf128(ppc_fp128 %arg0) {
}
define ppc_fp128 @ret_trunc_noinf_ppcf128(ppc_fp128 nofpclass(inf) %arg0) {
-; CHECK-LABEL: define ppc_fp128 @ret_trunc_noinf_ppcf128
+; CHECK-LABEL: define nofpclass(inf sub) ppc_fp128 @ret_trunc_noinf_ppcf128
; CHECK-SAME: (ppc_fp128 nofpclass(inf) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(inf sub) ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret ppc_fp128 [[CALL]]
;
%call = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 %arg0)
@@ -135,9 +135,9 @@ define ppc_fp128 @ret_trunc_noinf_ppcf128(ppc_fp128 nofpclass(inf) %arg0) {
}
define ppc_fp128 @ret_trunc_nopinf_ppcf128(ppc_fp128 nofpclass(pinf) %arg0) {
-; CHECK-LABEL: define ppc_fp128 @ret_trunc_nopinf_ppcf128
+; CHECK-LABEL: define nofpclass(pinf sub) ppc_fp128 @ret_trunc_nopinf_ppcf128
; CHECK-SAME: (ppc_fp128 nofpclass(pinf) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(pinf sub) ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret ppc_fp128 [[CALL]]
;
%call = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 %arg0)
@@ -145,9 +145,9 @@ define ppc_fp128 @ret_trunc_nopinf_ppcf128(ppc_fp128 nofpclass(pinf) %arg0) {
}
define ppc_fp128 @ret_trunc_noninf_ppcf128(ppc_fp128 nofpclass(ninf) %arg0) {
-; CHECK-LABEL: define ppc_fp128 @ret_trunc_noninf_ppcf128
+; CHECK-LABEL: define nofpclass(ninf sub) ppc_fp128 @ret_trunc_noninf_ppcf128
; CHECK-SAME: (ppc_fp128 nofpclass(ninf) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(ninf sub) ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret ppc_fp128 [[CALL]]
;
%call = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 %arg0)
@@ -155,9 +155,9 @@ define ppc_fp128 @ret_trunc_noninf_ppcf128(ppc_fp128 nofpclass(ninf) %arg0) {
}
define ppc_fp128 @ret_trunc_nonan_ppcf128(ppc_fp128 nofpclass(nan) %arg0) {
-; CHECK-LABEL: define ppc_fp128 @ret_trunc_nonan_ppcf128
+; CHECK-LABEL: define nofpclass(nan sub) ppc_fp128 @ret_trunc_nonan_ppcf128
; CHECK-SAME: (ppc_fp128 nofpclass(nan) [[ARG0:%.*]]) #[[ATTR1]] {
-; CHECK-NEXT: [[CALL:%.*]] = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
+; CHECK-NEXT: [[CALL:%.*]] = call nofpclass(nan sub) ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 [[ARG0]]) #[[ATTR2]]
; CHECK-NEXT: ret ppc_fp128 [[CALL]]
;
%call = call ppc_fp128 @llvm.trunc.ppcf128(ppc_fp128 %arg0)
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