[llvm] goldsteinn/cmp and spred (PR #94417)
via llvm-commits
llvm-commits at lists.llvm.org
Tue Jun 4 17:31:45 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms
Author: None (goldsteinn)
<details>
<summary>Changes</summary>
- **[InstCombine] Make `getKnownSign` a member function of InstCombiner; NFC**
- **[InstCombine] Add transforms `(icmp spred (and X, Y), X)` if `X` or `Y` are known signed/unsigned**
Several transforms:
1) If known `Y < 0`:
- slt -> ult: https://alive2.llvm.org/ce/z/9zt2iK
- sle -> ule: https://alive2.llvm.org/ce/z/SPoPNF
- sgt -> ugt: https://alive2.llvm.org/ce/z/IGNxAk
- sge -> uge: https://alive2.llvm.org/ce/z/joqTvR
2) If known `Y >= 0`:
- `(X & PosY) s> X --> X s< 0`
- https://alive2.llvm.org/ce/z/7e-5BQ
- `(X & PosY) s> X --> X s< 0`
- https://alive2.llvm.org/ce/z/jvT4Gb
3) If known `X < 0`:
- `(NegX & Y) s> NegX --> Y s>= 0`
- https://alive2.llvm.org/ce/z/ApkaEh
- `(NegX & Y) s<= NegX --> Y s< 0`
- https://alive2.llvm.org/ce/z/oRnfHp
---
Patch is 23.91 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/94417.diff
9 Files Affected:
- (modified) llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp (+12-18)
- (modified) llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp (+33)
- (modified) llvm/lib/Transforms/InstCombine/InstCombineInternal.h (+7)
- (modified) llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll (+1-2)
- (modified) llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sgt-to-icmp-sgt.ll (+1-2)
- (modified) llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll (+1-2)
- (modified) llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-slt-to-icmp-sgt.ll (+1-2)
- (modified) llvm/test/Transforms/InstCombine/icmp-and-lowbit-mask.ll (+34-38)
- (modified) llvm/test/Transforms/InstCombine/icmp-of-and-x.ll (+13-25)
``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
index b6f339da31f7f..3f156cad7b0da 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -1041,10 +1041,9 @@ Instruction *InstCombinerImpl::foldIntrinsicIsFPClass(IntrinsicInst &II) {
return nullptr;
}
-static std::optional<bool> getKnownSign(Value *Op, Instruction *CxtI,
- const DataLayout &DL, AssumptionCache *AC,
- DominatorTree *DT) {
- KnownBits Known = computeKnownBits(Op, DL, 0, AC, CxtI, DT);
+std::optional<bool> InstCombinerImpl::getKnownSign(Value *Op,
+ Instruction *CxtI) const {
+ KnownBits Known = llvm::computeKnownBits(Op, DL, /*Depth*/ 0, &AC, CxtI, &DT);
if (Known.isNonNegative())
return false;
if (Known.isNegative())
@@ -1058,13 +1057,10 @@ static std::optional<bool> getKnownSign(Value *Op, Instruction *CxtI,
ICmpInst::ICMP_SLT, Op, Constant::getNullValue(Op->getType()), CxtI, DL);
}
-static std::optional<bool> getKnownSignOrZero(Value *Op, Instruction *CxtI,
- const DataLayout &DL,
- AssumptionCache *AC,
- DominatorTree *DT) {
- if (std::optional<bool> Sign = getKnownSign(Op, CxtI, DL, AC, DT))
+std::optional<bool>
+InstCombinerImpl::getKnownSignOrZero(Value *Op, Instruction *CxtI) const {
+ if (std::optional<bool> Sign = getKnownSign(Op, CxtI))
return Sign;
-
Value *X, *Y;
if (match(Op, m_NSWSub(m_Value(X), m_Value(Y))))
return isImpliedByDomCondition(ICmpInst::ICMP_SLE, X, Y, CxtI, DL);
@@ -1074,12 +1070,11 @@ static std::optional<bool> getKnownSignOrZero(Value *Op, Instruction *CxtI,
/// Return true if two values \p Op0 and \p Op1 are known to have the same sign.
static bool signBitMustBeTheSame(Value *Op0, Value *Op1, Instruction *CxtI,
- const DataLayout &DL, AssumptionCache *AC,
- DominatorTree *DT) {
- std::optional<bool> Known1 = getKnownSign(Op1, CxtI, DL, AC, DT);
+ InstCombinerImpl &IC) {
+ std::optional<bool> Known1 = IC.getKnownSign(Op1, CxtI);
if (!Known1)
return false;
- std::optional<bool> Known0 = getKnownSign(Op0, CxtI, DL, AC, DT);
+ std::optional<bool> Known0 = IC.getKnownSign(Op0, CxtI);
if (!Known0)
return false;
return *Known0 == *Known1;
@@ -1627,8 +1622,7 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
return replaceOperand(*II, 0, XY);
}
- if (std::optional<bool> Known =
- getKnownSignOrZero(IIOperand, II, DL, &AC, &DT)) {
+ if (std::optional<bool> Known = getKnownSignOrZero(IIOperand, II)) {
// abs(x) -> x if x >= 0 (include abs(x-y) --> x - y where x >= y)
// abs(x) -> x if x > 0 (include abs(x-y) --> x - y where x > y)
if (!*Known)
@@ -1753,7 +1747,7 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
bool UseAndN = IID == Intrinsic::smin || IID == Intrinsic::umin;
if (IID == Intrinsic::smax || IID == Intrinsic::smin) {
- auto KnownSign = getKnownSign(X, II, DL, &AC, &DT);
+ auto KnownSign = getKnownSign(X, II);
if (KnownSign == std::nullopt) {
UseOr = false;
UseAndN = false;
@@ -2614,7 +2608,7 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
FastMathFlags InnerFlags = cast<FPMathOperator>(Src)->getFastMathFlags();
if ((FMF.allowReassoc() && InnerFlags.allowReassoc()) ||
- signBitMustBeTheSame(Exp, InnerExp, II, DL, &AC, &DT)) {
+ signBitMustBeTheSame(Exp, InnerExp, II, *this)) {
// TODO: Add nsw/nuw probably safe if integer type exceeds exponent
// width.
Value *NewExp = Builder.CreateAdd(InnerExp, Exp);
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index 89193f8ff94b6..d29f16d63b05b 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -4745,6 +4745,39 @@ static Instruction *foldICmpAndXX(ICmpInst &I, const SimplifyQuery &Q,
Constant::getNullValue(Op1->getType()));
}
+ if (!ICmpInst::isSigned(Pred))
+ return nullptr;
+
+ // (X & NegY) spred X --> (X & NegY) upred X
+ if (IC.getKnownSign(A, &I).value_or(false))
+ return new ICmpInst(ICmpInst::getUnsignedPredicate(Pred), Op0, Op1);
+
+ if (Pred != ICmpInst::ICMP_SLE && Pred != ICmpInst::ICMP_SGT)
+ return nullptr;
+
+ if (!IC.getKnownSignOrZero(A, &I).value_or(true)) {
+ // (X & PosY) s<= X --> X s>= 0
+ if (Pred == ICmpInst::ICMP_SLE)
+ return new ICmpInst(ICmpInst::ICMP_SGE, Op1,
+ Constant::getNullValue(Op1->getType()));
+ // (X & PosY) s> X --> X s< 0
+ if (Pred == ICmpInst::ICMP_SGT)
+ return new ICmpInst(ICmpInst::ICMP_SLT, Op1,
+ Constant::getNullValue(Op1->getType()));
+ }
+
+ if (IC.getKnownSign(Op1, &I).value_or(false)) {
+ // (NegX & Y) s> NegX --> Y s>= 0
+ if (Pred == ICmpInst::ICMP_SGT)
+ return new ICmpInst(ICmpInst::ICMP_SGE, A,
+ Constant::getNullValue(A->getType()));
+
+ // (NegX & Y) s<= NegX --> Y s< 0
+ if (Pred == ICmpInst::ICMP_SLE)
+ return new ICmpInst(ICmpInst::ICMP_SLT, A,
+ Constant::getNullValue(A->getType()));
+ }
+
return nullptr;
}
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
index 984f02bcccad7..bbd8fc5bf8fe5 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -491,6 +491,13 @@ class LLVM_LIBRARY_VISIBILITY InstCombinerImpl final
Instruction::BinaryOps BinaryOp, bool IsSigned,
Value *LHS, Value *RHS, Instruction *CxtI) const;
+ // Return true if known negative, false if known positive, and nullopt if
+ // unknown.
+ std::optional<bool> getKnownSign(Value *Op, Instruction *CxtI) const;
+ // Return true if known negative or zero, false if known non-zero positive,
+ // and nullopt if unknown.
+ std::optional<bool> getKnownSignOrZero(Value *Op, Instruction *CxtI) const;
+
/// Performs a few simplifications for operators which are associative
/// or commutative.
bool SimplifyAssociativeOrCommutative(BinaryOperator &I);
diff --git a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll
index ae503bfb1cfe2..e103fe9440986 100644
--- a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll
+++ b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll
@@ -98,8 +98,7 @@ declare i8 @gen8()
define i1 @c0() {
; CHECK-LABEL: @c0(
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
-; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3
-; CHECK-NEXT: [[RET:%.*]] = icmp sge i8 [[X]], [[TMP0]]
+; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], -1
; CHECK-NEXT: ret i1 [[RET]]
;
%x = call i8 @gen8()
diff --git a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sgt-to-icmp-sgt.ll b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sgt-to-icmp-sgt.ll
index d1dd411ee86b3..bbd733e86a32d 100644
--- a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sgt-to-icmp-sgt.ll
+++ b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sgt-to-icmp-sgt.ll
@@ -125,8 +125,7 @@ define i1 @oneuse0() {
define i1 @c0(i8 %x) {
; CHECK-LABEL: @c0(
-; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
-; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[TMP0]], [[X]]
+; CHECK-NEXT: [[RET:%.*]] = icmp slt i8 [[X:%.*]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
%tmp0 = and i8 %x, 3
diff --git a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll
index 4bed21a525f05..b167c8ad25aa9 100644
--- a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll
+++ b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll
@@ -113,8 +113,7 @@ define i1 @oneuse0() {
define i1 @c0(i8 %x) {
; CHECK-LABEL: @c0(
-; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
-; CHECK-NEXT: [[RET:%.*]] = icmp sle i8 [[TMP0]], [[X]]
+; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X:%.*]], -1
; CHECK-NEXT: ret i1 [[RET]]
;
%tmp0 = and i8 %x, 3
diff --git a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-slt-to-icmp-sgt.ll b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-slt-to-icmp-sgt.ll
index 8415204a4915a..8281502447732 100644
--- a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-slt-to-icmp-sgt.ll
+++ b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-slt-to-icmp-sgt.ll
@@ -108,8 +108,7 @@ declare i8 @gen8()
define i1 @c0() {
; CHECK-LABEL: @c0(
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
-; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3
-; CHECK-NEXT: [[RET:%.*]] = icmp slt i8 [[X]], [[TMP0]]
+; CHECK-NEXT: [[RET:%.*]] = icmp slt i8 [[X]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
%x = call i8 @gen8()
diff --git a/llvm/test/Transforms/InstCombine/icmp-and-lowbit-mask.ll b/llvm/test/Transforms/InstCombine/icmp-and-lowbit-mask.ll
index 8bb7fd0e522cb..0aace5f52c96c 100644
--- a/llvm/test/Transforms/InstCombine/icmp-and-lowbit-mask.ll
+++ b/llvm/test/Transforms/InstCombine/icmp-and-lowbit-mask.ll
@@ -7,8 +7,8 @@ define i1 @src_is_mask_zext(i16 %x_in, i8 %y) {
; CHECK-LABEL: @src_is_mask_zext(
; CHECK-NEXT: [[M_IN:%.*]] = lshr i8 -1, [[Y:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = zext i8 [[M_IN]] to i16
-; CHECK-NEXT: [[X:%.*]] = xor i16 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ule i16 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i16 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ule i16 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i16 %x_in, 123
@@ -83,8 +83,8 @@ define i1 @src_is_mask_and(i8 %x_in, i8 %y, i8 %z) {
; CHECK-NEXT: [[MY:%.*]] = lshr i8 7, [[Y:%.*]]
; CHECK-NEXT: [[MZ:%.*]] = lshr i8 -1, [[Z:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = and i8 [[MY]], [[MZ]]
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -121,8 +121,8 @@ define i1 @src_is_mask_or(i8 %x_in, i8 %y) {
; CHECK-LABEL: @src_is_mask_or(
; CHECK-NEXT: [[MY:%.*]] = lshr i8 -1, [[Y:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = and i8 [[MY]], 7
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -138,8 +138,8 @@ define i1 @src_is_mask_xor(i8 %x_in, i8 %y) {
; CHECK-LABEL: @src_is_mask_xor(
; CHECK-NEXT: [[Y_M1:%.*]] = add i8 [[Y:%.*]], -1
; CHECK-NEXT: [[MASK:%.*]] = xor i8 [[Y_M1]], [[Y]]
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -173,8 +173,8 @@ define i1 @src_is_mask_select(i8 %x_in, i8 %y, i1 %cond) {
; CHECK-NEXT: [[Y_M1:%.*]] = add i8 [[Y:%.*]], -1
; CHECK-NEXT: [[YMASK:%.*]] = xor i8 [[Y_M1]], [[Y]]
; CHECK-NEXT: [[MASK:%.*]] = select i1 [[COND:%.*]], i8 [[YMASK]], i8 15
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -249,8 +249,8 @@ define i1 @src_is_mask_lshr(i8 %x_in, i8 %y, i8 %z, i1 %cond) {
; CHECK-NEXT: [[YMASK:%.*]] = xor i8 [[Y_M1]], [[Y]]
; CHECK-NEXT: [[SMASK:%.*]] = select i1 [[COND:%.*]], i8 [[YMASK]], i8 15
; CHECK-NEXT: [[MASK:%.*]] = lshr i8 [[SMASK]], [[Z:%.*]]
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -269,8 +269,8 @@ define i1 @src_is_mask_ashr(i8 %x_in, i8 %y, i8 %z, i1 %cond) {
; CHECK-NEXT: [[YMASK:%.*]] = xor i8 [[Y_M1]], [[Y]]
; CHECK-NEXT: [[SMASK:%.*]] = select i1 [[COND:%.*]], i8 [[YMASK]], i8 15
; CHECK-NEXT: [[MASK:%.*]] = ashr i8 [[SMASK]], [[Z:%.*]]
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -287,8 +287,8 @@ define i1 @src_is_mask_p2_m1(i8 %x_in, i8 %y) {
; CHECK-LABEL: @src_is_mask_p2_m1(
; CHECK-NEXT: [[P2ORZ:%.*]] = shl i8 2, [[Y:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = add i8 [[P2ORZ]], -1
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -304,8 +304,8 @@ define i1 @src_is_mask_umax(i8 %x_in, i8 %y) {
; CHECK-NEXT: [[Y_M1:%.*]] = add i8 [[Y:%.*]], -1
; CHECK-NEXT: [[YMASK:%.*]] = xor i8 [[Y_M1]], [[Y]]
; CHECK-NEXT: [[MASK:%.*]] = call i8 @llvm.umax.i8(i8 [[YMASK]], i8 3)
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -324,8 +324,8 @@ define i1 @src_is_mask_umin(i8 %x_in, i8 %y, i8 %z) {
; CHECK-NEXT: [[YMASK:%.*]] = xor i8 [[Y_M1]], [[Y]]
; CHECK-NEXT: [[ZMASK:%.*]] = lshr i8 15, [[Z:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = call i8 @llvm.umin.i8(i8 [[YMASK]], i8 [[ZMASK]])
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -364,8 +364,8 @@ define i1 @src_is_mask_smax(i8 %x_in, i8 %y) {
; CHECK-NEXT: [[Y_M1:%.*]] = add i8 [[Y:%.*]], -1
; CHECK-NEXT: [[YMASK:%.*]] = xor i8 [[Y_M1]], [[Y]]
; CHECK-NEXT: [[MASK:%.*]] = call i8 @llvm.smax.i8(i8 [[YMASK]], i8 -1)
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -383,8 +383,8 @@ define i1 @src_is_mask_smin(i8 %x_in, i8 %y) {
; CHECK-NEXT: [[Y_M1:%.*]] = add i8 [[Y:%.*]], -1
; CHECK-NEXT: [[YMASK:%.*]] = xor i8 [[Y_M1]], [[Y]]
; CHECK-NEXT: [[MASK:%.*]] = call i8 @llvm.smin.i8(i8 [[YMASK]], i8 0)
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -401,8 +401,8 @@ define i1 @src_is_mask_bitreverse_not_mask(i8 %x_in, i8 %y) {
; CHECK-LABEL: @src_is_mask_bitreverse_not_mask(
; CHECK-NEXT: [[NMASK:%.*]] = shl nsw i8 -1, [[Y:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = call i8 @llvm.bitreverse.i8(i8 [[NMASK]])
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[X]], [[MASK]]
+; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X_IN:%.*]], 123
+; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[TMP1]], [[MASK]]
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -455,9 +455,9 @@ define i1 @src_is_notmask_shl(i8 %x_in, i8 %y, i1 %cond) {
define i1 @src_is_notmask_x_xor_neg_x(i8 %x_in, i8 %y, i1 %cond) {
; CHECK-LABEL: @src_is_notmask_x_xor_neg_x(
; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[NEG_Y:%.*]] = add i8 [[Y:%.*]], -1
-; CHECK-NEXT: [[NOTMASK0:%.*]] = xor i8 [[NEG_Y]], [[Y]]
-; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[COND:%.*]], i8 [[NOTMASK0]], i8 7
+; CHECK-NEXT: [[TMP1:%.*]] = add i8 [[Y:%.*]], -1
+; CHECK-NEXT: [[TMP2:%.*]] = xor i8 [[TMP1]], [[Y]]
+; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[COND:%.*]], i8 [[TMP2]], i8 7
; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[X]], [[TMP3]]
; CHECK-NEXT: ret i1 [[R]]
;
@@ -473,9 +473,9 @@ define i1 @src_is_notmask_x_xor_neg_x(i8 %x_in, i8 %y, i1 %cond) {
define i1 @src_is_notmask_x_xor_neg_x_inv(i8 %x_in, i8 %y, i1 %cond) {
; CHECK-LABEL: @src_is_notmask_x_xor_neg_x_inv(
; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[NEG_Y:%.*]] = add i8 [[Y:%.*]], -1
-; CHECK-NEXT: [[NOTMASK0:%.*]] = xor i8 [[NEG_Y]], [[Y]]
-; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[COND:%.*]], i8 [[NOTMASK0]], i8 7
+; CHECK-NEXT: [[TMP1:%.*]] = add i8 [[Y:%.*]], -1
+; CHECK-NEXT: [[TMP2:%.*]] = xor i8 [[TMP1]], [[Y]]
+; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[COND:%.*]], i8 [[TMP2]], i8 7
; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[X]], [[TMP3]]
; CHECK-NEXT: ret i1 [[R]]
;
@@ -625,9 +625,7 @@ define i1 @src_is_notmask_xor_fail(i8 %x_in, i8 %y) {
define i1 @src_is_mask_const_slt(i8 %x_in) {
; CHECK-LABEL: @src_is_mask_const_slt(
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[AND:%.*]] = and i8 [[X]], 7
-; CHECK-NEXT: [[R:%.*]] = icmp slt i8 [[X]], [[AND]]
+; CHECK-NEXT: [[R:%.*]] = icmp slt i8 [[X_IN:%.*]], 0
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
@@ -650,9 +648,7 @@ define i1 @src_is_mask_const_sgt(i8 %x_in) {
define i1 @src_is_mask_const_sle(i8 %x_in) {
; CHECK-LABEL: @src_is_mask_const_sle(
-; CHECK-NEXT: [[X:%.*]] = xor i8 [[X_IN:%.*]], 123
-; CHECK-NEXT: [[AND:%.*]] = and i8 [[X]], 31
-; CHECK-NEXT: [[R:%.*]] = icmp sle i8 [[AND]], [[X]]
+; CHECK-NEXT: [[R:%.*]] = icmp sgt i8 [[X_IN:%.*]], -1
; CHECK-NEXT: ret i1 [[R]]
;
%x = xor i8 %x_in, 123
diff --git a/llvm/test/Transforms/InstCombine/icmp-of-and-x.ll b/llvm/test/Transforms/InstCombine/icmp-of-and-x.ll
index 0f26be12c39cc..75badabda01ae 100644
--- a/llvm/test/Transforms/InstCombine/icmp-of-and-x.ll
+++ b/llvm/test/Transforms/InstCombine/icmp-of-and-x.ll
@@ -58,7 +58,7 @@ define i1 @icmp_sge_x_negy(i8 %x, i8 %y) {
; CHECK-NEXT: [[CY:%.*]] = icmp slt i8 [[Y:%.*]], 0
; CHECK-NEXT: call void @llvm.assume(i1 [[CY]])
; CHECK-NEXT: [[AND:%.*]] = and i8 [[X:%.*]], [[Y]]
-; CHECK-NEXT: [[Z:%.*]] = icmp sge i8 [[AND]], [[X]]
+; CHECK-NEXT: [[Z:%.*]] = icmp eq i8 [[AND]], [[X]]
; CHECK-NEXT: ret i1 [[Z]]
;
%cy = icmp slt i8 %y, 0
@@ -74,7 +74,7 @@ define i1 @icmp_slt_x_negy(i8 %x, i8 %y) {
; CHECK-NEXT: br i1 [[CY]], label [[NEGY:%.*]], label [[POSY:%.*]]
; CHECK: negy:
; CHECK-NEXT: [[AND:%.*]] = and i8 [[X:%.*]], [[Y]]
-; CHECK-NEXT: [[Z:%.*]] = icmp slt i8 [[AND]], [[X]]
+; CHECK-NEXT: [[Z:%.*]] = icmp ne i8 [[AND]], [[X]]
; ...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/94417
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