Revert "[InstCombine] Folding (icmp eq/ne (and X, -P2), INT_MIN)"
#111236
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vitalybuka
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@llvm/pr-subscribers-llvm-transforms Author: Vitaly Buka (vitalybuka) ChangesReverts #110880 because of exposed issue is Msan instrumentation #111212. This reverts commit a646436. Full diff: https://github.com/llvm/llvm-project/pull/111236.diff 3 Files Affected:
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index 12eec99e7d22bb..6c3fc987d9add2 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -5015,18 +5015,6 @@ Instruction *InstCombinerImpl::foldICmpBinOp(ICmpInst &I,
}
}
- // (icmp eq/ne (X, -P2), INT_MIN)
- // -> (icmp slt/sge X, INT_MIN + P2)
- if (ICmpInst::isEquality(Pred) && BO0 &&
- match(I.getOperand(1), m_SignMask()) &&
- match(BO0, m_And(m_Value(), m_NegatedPower2OrZero()))) {
- // Will Constant fold.
- Value *NewC = Builder.CreateSub(I.getOperand(1), BO0->getOperand(1));
- return new ICmpInst(Pred == ICmpInst::ICMP_EQ ? ICmpInst::ICMP_SLT
- : ICmpInst::ICMP_SGE,
- BO0->getOperand(0), NewC);
- }
-
{
// Similar to above: an unsigned overflow comparison may use offset + mask:
// ((Op1 + C) & C) u< Op1 --> Op1 != 0
diff --git a/llvm/test/Transforms/InstCombine/icmp-signmask.ll b/llvm/test/Transforms/InstCombine/icmp-signmask.ll
index 5424f7d7e8021f..bea8da2074ab0b 100644
--- a/llvm/test/Transforms/InstCombine/icmp-signmask.ll
+++ b/llvm/test/Transforms/InstCombine/icmp-signmask.ll
@@ -3,7 +3,8 @@
define i1 @cmp_x_and_negp2_with_eq(i8 %x) {
; CHECK-LABEL: @cmp_x_and_negp2_with_eq(
-; CHECK-NEXT: [[R:%.*]] = icmp slt i8 [[X:%.*]], -126
+; CHECK-NEXT: [[ANDX:%.*]] = and i8 [[X:%.*]], -2
+; CHECK-NEXT: [[R:%.*]] = icmp eq i8 [[ANDX]], -128
; CHECK-NEXT: ret i1 [[R]]
;
%andx = and i8 %x, -2
@@ -24,7 +25,8 @@ define i1 @cmp_x_and_negp2_with_eq_fail_not_signmask(i8 %x) {
define <2 x i1> @cmp_x_and_negp2_with_ne(<2 x i8> %x) {
; CHECK-LABEL: @cmp_x_and_negp2_with_ne(
-; CHECK-NEXT: [[R:%.*]] = icmp sgt <2 x i8> [[X:%.*]], <i8 -121, i8 -113>
+; CHECK-NEXT: [[ANDX:%.*]] = and <2 x i8> [[X:%.*]], <i8 -8, i8 -16>
+; CHECK-NEXT: [[R:%.*]] = icmp ne <2 x i8> [[ANDX]], <i8 -128, i8 -128>
; CHECK-NEXT: ret <2 x i1> [[R]]
;
%andx = and <2 x i8> %x, <i8 -8, i8 -16>
@@ -34,7 +36,8 @@ define <2 x i1> @cmp_x_and_negp2_with_ne(<2 x i8> %x) {
define <2 x i1> @cmp_x_and_negp2_with_ne_or_z(<2 x i8> %x) {
; CHECK-LABEL: @cmp_x_and_negp2_with_ne_or_z(
-; CHECK-NEXT: [[R:%.*]] = icmp sge <2 x i8> [[X:%.*]], <i8 -128, i8 -112>
+; CHECK-NEXT: [[ANDX:%.*]] = and <2 x i8> [[X:%.*]], <i8 0, i8 -16>
+; CHECK-NEXT: [[R:%.*]] = icmp ne <2 x i8> [[ANDX]], <i8 -128, i8 -128>
; CHECK-NEXT: ret <2 x i1> [[R]]
;
%andx = and <2 x i8> %x, <i8 0, i8 -16>
diff --git a/llvm/test/Transforms/InstCombine/icmp.ll b/llvm/test/Transforms/InstCombine/icmp.ll
index 17ed64b6e04d91..ecf21b8a42cf50 100644
--- a/llvm/test/Transforms/InstCombine/icmp.ll
+++ b/llvm/test/Transforms/InstCombine/icmp.ll
@@ -1116,7 +1116,8 @@ define i1 @test53(i32 %a, i32 %b) {
define i1 @test54(i8 %a) {
; CHECK-LABEL: @test54(
-; CHECK-NEXT: [[RET:%.*]] = icmp slt i8 [[A:%.*]], -64
+; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[A:%.*]], -64
+; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP1]], -128
; CHECK-NEXT: ret i1 [[RET]]
;
%ext = zext i8 %a to i32
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Kyvangka1610
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Oct 5, 2024
…lvm#111236) Reverts llvm#110880 because of exposed issue is Msan instrumentation llvm#111212. This reverts commit a646436.
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* commit 'FETCH_HEAD': [clang][bytecode] Handle UETT_OpenMPRequiredSimdAlign (llvm#111259) [mlir][polynomial] Add and verify constraints of coefficientModulus for ringAttr (llvm#111016) [clang][bytecode] Save a per-Block IsWeak bit (llvm#111248) [analyzer] Fix wrong `builtin_*_overflow` return type (llvm#111253) [SelectOpt] Don't convert constant selects to branches. (llvm#110858) [InstCombine] Update and-or-icmps.ll after 574266c. NFC [Instcombine] Test for more gep canonicalization [NFC][TableGen] Change `CodeGenIntrinsics` to use const references (llvm#111219) Add warning message to `session save` when transcript isn't saved. (llvm#109020) [RISCV][TTI] Recognize CONCAT_VECTORS if a shufflevector mask is multiple insert subvector. (llvm#110457) Revert "[InstCombine] Folding `(icmp eq/ne (and X, -P2), INT_MIN)`" (llvm#111236) [NFC][lsan] Add SuspendAllThreads traces [lsan] Add `thread_suspend_fail` flag Signed-off-by: kyvangka1610 <[email protected]>
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NoumanAmir657
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Nov 4, 2024
…lvm#111236) The underlying issue with msan was fixed by llvm#113200
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Reverts #110880 because of exposed issue is Msan instrumentation #111212.
This reverts commit a646436.