[llvm] [msan] Handle llvm.x86.vcvtps2ph.128/256 explicitly (PR #130705)
Thurston Dang via llvm-commits
llvm-commits at lists.llvm.org
Thu Mar 13 08:55:30 PDT 2025
https://github.com/thurstond updated https://github.com/llvm/llvm-project/pull/130705
>From 6feca3eee514b8eddc5c0a115172d6d922e7d80f Mon Sep 17 00:00:00 2001
From: Thurston Dang <thurston at google.com>
Date: Tue, 11 Mar 2025 03:02:49 +0000
Subject: [PATCH 1/6] [msan] Handle llvm.x86.vcvtps2ph.128/256 explicitly
Check whether each lane is fully initialized, and propagate the shadow
per lane instead of using the strict handling of visitInstruction.
Changes the tests from https://github.com/llvm/llvm-project/pull/129807
---
.../Instrumentation/MemorySanitizer.cpp | 60 ++++++++
.../MemorySanitizer/X86/f16c-intrinsics.ll | 133 +++++++++---------
2 files changed, 130 insertions(+), 63 deletions(-)
diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index a077c85ffc410..3115b4312f519 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -3273,6 +3273,60 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
setOriginForNaryOp(I);
}
+ /// Handle x86 SSE single-precision to half-precision conversion.
+ ///
+ /// e.g.,
+ /// <8 x i16> @llvm.x86.vcvtps2ph.256(<8 x float> %a0, i32 0)
+ /// <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> %a0, i32 0)
+ /// Note: if the output has more elements, they are zero-initialized (and
+ /// therefore the shadow will also be initialized).
+ ///
+ /// This differs from handleSSEVectorConvertIntrinsic() because it
+ /// propagates uninitialized shadow (instead of checking the shadow).
+ void handleSSEVectorConvertIntrinsicByProp(IntrinsicInst &I) {
+ assert(I.arg_size() == 2);
+ Value *Src = I.getArgOperand(0);
+ assert(Src->getType()->isVectorTy());
+ Value *RoundingMode = I.getArgOperand(1);
+ assert(RoundingMode->getType()->isIntegerTy());
+
+ // The return type might have more elements than the input.
+ // Temporarily shrink the return type's number of elements.
+ VectorType *ShadowType = cast<VectorType>(getShadowTy(&I));
+ if (ShadowType->getElementCount() == cast<VectorType>(Src->getType())->getElementCount() * 2)
+ ShadowType = VectorType::getHalfElementsVectorType(ShadowType);
+
+ assert(ShadowType->getElementCount() == cast<VectorType>(Src->getType())->getElementCount());
+
+ IRBuilder<> IRB(&I);
+ Value *S0 = getShadow(&I, 0);
+
+ /// For scalars:
+ /// Since they are converting from floating-point to integer, the output is
+ /// - fully uninitialized if *any* bit of the input is uninitialized
+ /// - fully ininitialized if all bits of the input are ininitialized
+ /// We apply the same principle on a per-field basis for vectors.
+ Value *Shadow = IRB.CreateSExt(IRB.CreateICmpNE(S0, getCleanShadow(S0)),
+ ShadowType);
+
+ // The return type might have more elements than the input.
+ // Extend the return type back to its original width.
+ Value *FullShadow = getCleanShadow(&I);
+
+ if (Shadow->getType() == FullShadow->getType())
+ FullShadow = Shadow;
+ else {
+ for (unsigned int i = 0; i < cast<FixedVectorType>(Src->getType())->getNumElements(); i++) {
+ Value *Elem = IRB.CreateExtractElement(Shadow, i);
+ FullShadow = IRB.CreateInsertElement(FullShadow, Elem, i);
+ }
+ }
+
+ setShadow(&I, FullShadow);
+ setOriginForNaryOp(I);
+ }
+
+
// Instrument x86 SSE vector convert intrinsic.
//
// This function instruments intrinsics like cvtsi2ss:
@@ -4868,6 +4922,12 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
break;
}
+ case Intrinsic::x86_vcvtps2ph_128:
+ case Intrinsic::x86_vcvtps2ph_256: {
+ handleSSEVectorConvertIntrinsicByProp(I);
+ break;
+ }
+
case Intrinsic::fshl:
case Intrinsic::fshr:
handleFunnelShift(I);
diff --git a/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll b/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
index 0868e0c836e80..a77e0ce60aede 100644
--- a/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
+++ b/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
@@ -14,15 +14,18 @@ define <8 x i16> @test_x86_vcvtps2ph_128(<4 x float> %a0) #0 {
; CHECK-SAME: <4 x float> [[A0:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: [[TMP1:%.*]] = load <4 x i32>, ptr @__msan_param_tls, align 8
; CHECK-NEXT: call void @llvm.donothing()
-; CHECK-NEXT: [[TMP2:%.*]] = bitcast <4 x i32> [[TMP1]] to i128
-; CHECK-NEXT: [[_MSCMP:%.*]] = icmp ne i128 [[TMP2]], 0
-; CHECK-NEXT: br i1 [[_MSCMP]], label %[[BB3:.*]], label %[[BB4:.*]], !prof [[PROF1:![0-9]+]]
-; CHECK: [[BB3]]:
-; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4:[0-9]+]]
-; CHECK-NEXT: unreachable
-; CHECK: [[BB4]]:
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <4 x i32> [[TMP1]], zeroinitializer
+; CHECK-NEXT: [[TMP3:%.*]] = sext <4 x i1> [[TMP2]] to <4 x i16>
+; CHECK-NEXT: [[TMP4:%.*]] = extractelement <4 x i16> [[TMP3]], i64 0
+; CHECK-NEXT: [[TMP5:%.*]] = insertelement <8 x i16> zeroinitializer, i16 [[TMP4]], i64 0
+; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i16> [[TMP3]], i64 1
+; CHECK-NEXT: [[TMP7:%.*]] = insertelement <8 x i16> [[TMP5]], i16 [[TMP6]], i64 1
+; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i16> [[TMP3]], i64 2
+; CHECK-NEXT: [[TMP9:%.*]] = insertelement <8 x i16> [[TMP7]], i16 [[TMP8]], i64 2
+; CHECK-NEXT: [[TMP10:%.*]] = extractelement <4 x i16> [[TMP3]], i64 3
+; CHECK-NEXT: [[TMP11:%.*]] = insertelement <8 x i16> [[TMP9]], i16 [[TMP10]], i64 3
; CHECK-NEXT: [[RES:%.*]] = call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> [[A0]], i32 0)
-; CHECK-NEXT: store <8 x i16> zeroinitializer, ptr @__msan_retval_tls, align 8
+; CHECK-NEXT: store <8 x i16> [[TMP11]], ptr @__msan_retval_tls, align 8
; CHECK-NEXT: ret <8 x i16> [[RES]]
;
%res = call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> %a0, i32 0) ; <<8 x i16>> [#uses=1]
@@ -35,15 +38,10 @@ define <8 x i16> @test_x86_vcvtps2ph_256(<8 x float> %a0) #0 {
; CHECK-SAME: <8 x float> [[A0:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[TMP1:%.*]] = load <8 x i32>, ptr @__msan_param_tls, align 8
; CHECK-NEXT: call void @llvm.donothing()
-; CHECK-NEXT: [[TMP2:%.*]] = bitcast <8 x i32> [[TMP1]] to i256
-; CHECK-NEXT: [[_MSCMP:%.*]] = icmp ne i256 [[TMP2]], 0
-; CHECK-NEXT: br i1 [[_MSCMP]], label %[[BB3:.*]], label %[[BB4:.*]], !prof [[PROF1]]
-; CHECK: [[BB3]]:
-; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
-; CHECK-NEXT: unreachable
-; CHECK: [[BB4]]:
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <8 x i32> [[TMP1]], zeroinitializer
+; CHECK-NEXT: [[TMP3:%.*]] = sext <8 x i1> [[TMP2]] to <8 x i16>
; CHECK-NEXT: [[RES:%.*]] = call <8 x i16> @llvm.x86.vcvtps2ph.256(<8 x float> [[A0]], i32 0)
-; CHECK-NEXT: store <8 x i16> zeroinitializer, ptr @__msan_retval_tls, align 8
+; CHECK-NEXT: store <8 x i16> [[TMP3]], ptr @__msan_retval_tls, align 8
; CHECK-NEXT: ret <8 x i16> [[RES]]
;
%res = call <8 x i16> @llvm.x86.vcvtps2ph.256(<8 x float> %a0, i32 0) ; <<8 x i16>> [#uses=1]
@@ -59,24 +57,19 @@ define void @test_x86_vcvtps2ph_256_m(ptr nocapture %d, <8 x float> %a) nounwind
; CHECK-NEXT: [[TMP17:%.*]] = load <8 x i32>, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_param_tls to i64), i64 8) to ptr), align 8
; CHECK-NEXT: [[TMP18:%.*]] = load i64, ptr @__msan_param_tls, align 8
; CHECK-NEXT: call void @llvm.donothing()
-; CHECK-NEXT: [[TMP4:%.*]] = bitcast <8 x i32> [[TMP17]] to i256
-; CHECK-NEXT: [[_MSCMP:%.*]] = icmp ne i256 [[TMP4]], 0
-; CHECK-NEXT: br i1 [[_MSCMP]], label %[[BB3:.*]], label %[[BB4:.*]], !prof [[PROF1]]
-; CHECK: [[BB3]]:
-; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
-; CHECK-NEXT: unreachable
-; CHECK: [[BB4]]:
+; CHECK-NEXT: [[TMP20:%.*]] = icmp ne <8 x i32> [[TMP17]], zeroinitializer
+; CHECK-NEXT: [[TMP21:%.*]] = sext <8 x i1> [[TMP20]] to <8 x i16>
; CHECK-NEXT: [[TMP0:%.*]] = tail call <8 x i16> @llvm.x86.vcvtps2ph.256(<8 x float> [[A]], i32 3)
; CHECK-NEXT: [[_MSCMP1:%.*]] = icmp ne i64 [[TMP18]], 0
-; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB6:.*]], label %[[BB7:.*]], !prof [[PROF1]]
-; CHECK: [[BB6]]:
-; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
+; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB5:.*]], label %[[BB6:.*]], !prof [[PROF1:![0-9]+]]
+; CHECK: [[BB5]]:
+; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4:[0-9]+]]
; CHECK-NEXT: unreachable
-; CHECK: [[BB7]]:
+; CHECK: [[BB6]]:
; CHECK-NEXT: [[TMP1:%.*]] = ptrtoint ptr [[D]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = xor i64 [[TMP1]], 87960930222080
; CHECK-NEXT: [[TMP3:%.*]] = inttoptr i64 [[TMP2]] to ptr
-; CHECK-NEXT: store <8 x i16> zeroinitializer, ptr [[TMP3]], align 16
+; CHECK-NEXT: store <8 x i16> [[TMP21]], ptr [[TMP3]], align 16
; CHECK-NEXT: store <8 x i16> [[TMP0]], ptr [[D]], align 16
; CHECK-NEXT: ret void
;
@@ -93,25 +86,29 @@ define void @test_x86_vcvtps2ph_128_m(ptr nocapture %d, <4 x float> %a) nounwind
; CHECK-NEXT: [[TMP9:%.*]] = load <4 x i32>, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_param_tls to i64), i64 8) to ptr), align 8
; CHECK-NEXT: [[TMP10:%.*]] = load i64, ptr @__msan_param_tls, align 8
; CHECK-NEXT: call void @llvm.donothing()
-; CHECK-NEXT: [[TMP5:%.*]] = bitcast <4 x i32> [[TMP9]] to i128
-; CHECK-NEXT: [[_MSCMP:%.*]] = icmp ne i128 [[TMP5]], 0
-; CHECK-NEXT: br i1 [[_MSCMP]], label %[[BB3:.*]], label %[[BB4:.*]], !prof [[PROF1]]
-; CHECK: [[BB3]]:
-; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
-; CHECK-NEXT: unreachable
-; CHECK: [[BB4]]:
+; CHECK-NEXT: [[TMP12:%.*]] = icmp ne <4 x i32> [[TMP9]], zeroinitializer
+; CHECK-NEXT: [[TMP13:%.*]] = sext <4 x i1> [[TMP12]] to <4 x i16>
+; CHECK-NEXT: [[TMP14:%.*]] = extractelement <4 x i16> [[TMP13]], i64 0
+; CHECK-NEXT: [[TMP5:%.*]] = insertelement <8 x i16> zeroinitializer, i16 [[TMP14]], i64 0
+; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i16> [[TMP13]], i64 1
+; CHECK-NEXT: [[TMP7:%.*]] = insertelement <8 x i16> [[TMP5]], i16 [[TMP6]], i64 1
+; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i16> [[TMP13]], i64 2
+; CHECK-NEXT: [[TMP15:%.*]] = insertelement <8 x i16> [[TMP7]], i16 [[TMP8]], i64 2
+; CHECK-NEXT: [[TMP16:%.*]] = extractelement <4 x i16> [[TMP13]], i64 3
+; CHECK-NEXT: [[TMP11:%.*]] = insertelement <8 x i16> [[TMP15]], i16 [[TMP16]], i64 3
; CHECK-NEXT: [[TMP0:%.*]] = tail call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> [[A]], i32 3)
+; CHECK-NEXT: [[_MSPROP:%.*]] = shufflevector <8 x i16> [[TMP11]], <8 x i16> splat (i16 -1), <4 x i32> <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <8 x i16> [[TMP0]], <8 x i16> poison, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT: [[_MSCMP1:%.*]] = icmp ne i64 [[TMP10]], 0
-; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB7:.*]], label %[[BB8:.*]], !prof [[PROF1]]
-; CHECK: [[BB7]]:
+; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB14:.*]], label %[[BB15:.*]], !prof [[PROF1]]
+; CHECK: [[BB14]]:
; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
; CHECK-NEXT: unreachable
-; CHECK: [[BB8]]:
+; CHECK: [[BB15]]:
; CHECK-NEXT: [[TMP2:%.*]] = ptrtoint ptr [[D]] to i64
; CHECK-NEXT: [[TMP3:%.*]] = xor i64 [[TMP2]], 87960930222080
; CHECK-NEXT: [[TMP4:%.*]] = inttoptr i64 [[TMP3]] to ptr
-; CHECK-NEXT: store <4 x i16> zeroinitializer, ptr [[TMP4]], align 8
+; CHECK-NEXT: store <4 x i16> [[_MSPROP]], ptr [[TMP4]], align 8
; CHECK-NEXT: store <4 x i16> [[TMP1]], ptr [[D]], align 8
; CHECK-NEXT: ret void
;
@@ -129,26 +126,31 @@ define void @test_x86_vcvtps2ph_128_m2(ptr nocapture %hf4x16, <4 x float> %f4X86
; CHECK-NEXT: [[TMP0:%.*]] = load <4 x i32>, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_param_tls to i64), i64 8) to ptr), align 8
; CHECK-NEXT: [[TMP1:%.*]] = load i64, ptr @__msan_param_tls, align 8
; CHECK-NEXT: call void @llvm.donothing()
-; CHECK-NEXT: [[TMP2:%.*]] = bitcast <4 x i32> [[TMP0]] to i128
-; CHECK-NEXT: [[_MSCMP:%.*]] = icmp ne i128 [[TMP2]], 0
-; CHECK-NEXT: br i1 [[_MSCMP]], label %[[BB3:.*]], label %[[BB4:.*]], !prof [[PROF1]]
-; CHECK: [[BB3]]:
-; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
-; CHECK-NEXT: unreachable
-; CHECK: [[BB4]]:
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <4 x i32> [[TMP0]], zeroinitializer
+; CHECK-NEXT: [[TMP3:%.*]] = sext <4 x i1> [[TMP2]] to <4 x i16>
+; CHECK-NEXT: [[TMP4:%.*]] = extractelement <4 x i16> [[TMP3]], i64 0
+; CHECK-NEXT: [[TMP5:%.*]] = insertelement <8 x i16> zeroinitializer, i16 [[TMP4]], i64 0
+; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i16> [[TMP3]], i64 1
+; CHECK-NEXT: [[TMP7:%.*]] = insertelement <8 x i16> [[TMP5]], i16 [[TMP6]], i64 1
+; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i16> [[TMP3]], i64 2
+; CHECK-NEXT: [[TMP9:%.*]] = insertelement <8 x i16> [[TMP7]], i16 [[TMP8]], i64 2
+; CHECK-NEXT: [[TMP10:%.*]] = extractelement <4 x i16> [[TMP3]], i64 3
+; CHECK-NEXT: [[TMP14:%.*]] = insertelement <8 x i16> [[TMP9]], i16 [[TMP10]], i64 3
; CHECK-NEXT: [[TMP11:%.*]] = tail call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> [[F4X86]], i32 3)
+; CHECK-NEXT: [[TMP13:%.*]] = bitcast <8 x i16> [[TMP14]] to <2 x i64>
; CHECK-NEXT: [[TMP12:%.*]] = bitcast <8 x i16> [[TMP11]] to <2 x double>
+; CHECK-NEXT: [[_MSPROP:%.*]] = extractelement <2 x i64> [[TMP13]], i32 0
; CHECK-NEXT: [[VECEXT:%.*]] = extractelement <2 x double> [[TMP12]], i32 0
; CHECK-NEXT: [[_MSCMP1:%.*]] = icmp ne i64 [[TMP1]], 0
-; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB7:.*]], label %[[BB8:.*]], !prof [[PROF1]]
-; CHECK: [[BB7]]:
+; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB15:.*]], label %[[BB16:.*]], !prof [[PROF1]]
+; CHECK: [[BB15]]:
; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
; CHECK-NEXT: unreachable
-; CHECK: [[BB8]]:
+; CHECK: [[BB16]]:
; CHECK-NEXT: [[TMP15:%.*]] = ptrtoint ptr [[HF4X16]] to i64
; CHECK-NEXT: [[TMP16:%.*]] = xor i64 [[TMP15]], 87960930222080
; CHECK-NEXT: [[TMP17:%.*]] = inttoptr i64 [[TMP16]] to ptr
-; CHECK-NEXT: store i64 0, ptr [[TMP17]], align 8
+; CHECK-NEXT: store i64 [[_MSPROP]], ptr [[TMP17]], align 8
; CHECK-NEXT: store double [[VECEXT]], ptr [[HF4X16]], align 8
; CHECK-NEXT: ret void
;
@@ -167,27 +169,32 @@ define void @test_x86_vcvtps2ph_128_m3(ptr nocapture %hf4x16, <4 x float> %f4X86
; CHECK-NEXT: [[TMP0:%.*]] = load <4 x i32>, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_param_tls to i64), i64 8) to ptr), align 8
; CHECK-NEXT: [[TMP1:%.*]] = load i64, ptr @__msan_param_tls, align 8
; CHECK-NEXT: call void @llvm.donothing()
-; CHECK-NEXT: [[TMP2:%.*]] = bitcast <4 x i32> [[TMP0]] to i128
-; CHECK-NEXT: [[_MSCMP:%.*]] = icmp ne i128 [[TMP2]], 0
-; CHECK-NEXT: br i1 [[_MSCMP]], label %[[BB3:.*]], label %[[BB4:.*]], !prof [[PROF1]]
-; CHECK: [[BB3]]:
-; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
-; CHECK-NEXT: unreachable
-; CHECK: [[BB4]]:
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <4 x i32> [[TMP0]], zeroinitializer
+; CHECK-NEXT: [[TMP3:%.*]] = sext <4 x i1> [[TMP2]] to <4 x i16>
+; CHECK-NEXT: [[TMP4:%.*]] = extractelement <4 x i16> [[TMP3]], i64 0
+; CHECK-NEXT: [[TMP5:%.*]] = insertelement <8 x i16> zeroinitializer, i16 [[TMP4]], i64 0
+; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i16> [[TMP3]], i64 1
+; CHECK-NEXT: [[TMP7:%.*]] = insertelement <8 x i16> [[TMP5]], i16 [[TMP6]], i64 1
+; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i16> [[TMP3]], i64 2
+; CHECK-NEXT: [[TMP9:%.*]] = insertelement <8 x i16> [[TMP7]], i16 [[TMP8]], i64 2
+; CHECK-NEXT: [[TMP10:%.*]] = extractelement <4 x i16> [[TMP3]], i64 3
+; CHECK-NEXT: [[TMP13:%.*]] = insertelement <8 x i16> [[TMP9]], i16 [[TMP10]], i64 3
; CHECK-NEXT: [[TMP11:%.*]] = tail call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> [[F4X86]], i32 3)
-; CHECK-NEXT: [[TMP12:%.*]] = bitcast <8 x i16> [[TMP11]] to <2 x i64>
+; CHECK-NEXT: [[TMP12:%.*]] = bitcast <8 x i16> [[TMP13]] to <2 x i64>
+; CHECK-NEXT: [[TMP14:%.*]] = bitcast <8 x i16> [[TMP11]] to <2 x i64>
; CHECK-NEXT: [[VECEXT:%.*]] = extractelement <2 x i64> [[TMP12]], i32 0
+; CHECK-NEXT: [[VECEXT1:%.*]] = extractelement <2 x i64> [[TMP14]], i32 0
; CHECK-NEXT: [[_MSCMP1:%.*]] = icmp ne i64 [[TMP1]], 0
-; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB7:.*]], label %[[BB8:.*]], !prof [[PROF1]]
-; CHECK: [[BB7]]:
+; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB15:.*]], label %[[BB16:.*]], !prof [[PROF1]]
+; CHECK: [[BB15]]:
; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
; CHECK-NEXT: unreachable
-; CHECK: [[BB8]]:
+; CHECK: [[BB16]]:
; CHECK-NEXT: [[TMP15:%.*]] = ptrtoint ptr [[HF4X16]] to i64
; CHECK-NEXT: [[TMP16:%.*]] = xor i64 [[TMP15]], 87960930222080
; CHECK-NEXT: [[TMP17:%.*]] = inttoptr i64 [[TMP16]] to ptr
-; CHECK-NEXT: store i64 0, ptr [[TMP17]], align 8
-; CHECK-NEXT: store i64 [[VECEXT]], ptr [[HF4X16]], align 8
+; CHECK-NEXT: store i64 [[VECEXT]], ptr [[TMP17]], align 8
+; CHECK-NEXT: store i64 [[VECEXT1]], ptr [[HF4X16]], align 8
; CHECK-NEXT: ret void
;
entry:
>From e647b1d6a67fb2775a5734e6951195cbb4e2f237 Mon Sep 17 00:00:00 2001
From: Thurston Dang <thurston at google.com>
Date: Tue, 11 Mar 2025 03:12:43 +0000
Subject: [PATCH 2/6] Use shufflevector
---
.../Instrumentation/MemorySanitizer.cpp | 12 ++--
.../MemorySanitizer/X86/f16c-intrinsics.ll | 56 +++++--------------
2 files changed, 21 insertions(+), 47 deletions(-)
diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index 3115b4312f519..d649d3bf9944b 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -3310,16 +3310,18 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
ShadowType);
// The return type might have more elements than the input.
- // Extend the return type back to its original width.
+ // Extend the return type back to its original width if necessary.
Value *FullShadow = getCleanShadow(&I);
if (Shadow->getType() == FullShadow->getType())
FullShadow = Shadow;
else {
- for (unsigned int i = 0; i < cast<FixedVectorType>(Src->getType())->getNumElements(); i++) {
- Value *Elem = IRB.CreateExtractElement(Shadow, i);
- FullShadow = IRB.CreateInsertElement(FullShadow, Elem, i);
- }
+ SmallVector<int, 8> ShadowMask;
+ for (unsigned X = 0; X < cast<FixedVectorType>(FullShadow->getType())->getNumElements(); ++X)
+ ShadowMask.push_back(X);
+
+ // Append zeros
+ FullShadow = IRB.CreateShuffleVector(Shadow, getCleanShadow(Shadow), ShadowMask);
}
setShadow(&I, FullShadow);
diff --git a/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll b/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
index a77e0ce60aede..253bab5cb4bd5 100644
--- a/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
+++ b/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
@@ -3,7 +3,7 @@
;
; Forked from llvm/test/CodeGen/X86/f16c-intrinsics.ll
;
-; Handled by visitInstruction:
+; Handled by handleSSEVectorConvertIntrinsicByProp:
; - llvm.x86.vcvtps2ph.128/256
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
@@ -16,14 +16,7 @@ define <8 x i16> @test_x86_vcvtps2ph_128(<4 x float> %a0) #0 {
; CHECK-NEXT: call void @llvm.donothing()
; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <4 x i32> [[TMP1]], zeroinitializer
; CHECK-NEXT: [[TMP3:%.*]] = sext <4 x i1> [[TMP2]] to <4 x i16>
-; CHECK-NEXT: [[TMP4:%.*]] = extractelement <4 x i16> [[TMP3]], i64 0
-; CHECK-NEXT: [[TMP5:%.*]] = insertelement <8 x i16> zeroinitializer, i16 [[TMP4]], i64 0
-; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i16> [[TMP3]], i64 1
-; CHECK-NEXT: [[TMP7:%.*]] = insertelement <8 x i16> [[TMP5]], i16 [[TMP6]], i64 1
-; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i16> [[TMP3]], i64 2
-; CHECK-NEXT: [[TMP9:%.*]] = insertelement <8 x i16> [[TMP7]], i16 [[TMP8]], i64 2
-; CHECK-NEXT: [[TMP10:%.*]] = extractelement <4 x i16> [[TMP3]], i64 3
-; CHECK-NEXT: [[TMP11:%.*]] = insertelement <8 x i16> [[TMP9]], i16 [[TMP10]], i64 3
+; CHECK-NEXT: [[TMP11:%.*]] = shufflevector <4 x i16> [[TMP3]], <4 x i16> zeroinitializer, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT: [[RES:%.*]] = call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> [[A0]], i32 0)
; CHECK-NEXT: store <8 x i16> [[TMP11]], ptr @__msan_retval_tls, align 8
; CHECK-NEXT: ret <8 x i16> [[RES]]
@@ -88,23 +81,16 @@ define void @test_x86_vcvtps2ph_128_m(ptr nocapture %d, <4 x float> %a) nounwind
; CHECK-NEXT: call void @llvm.donothing()
; CHECK-NEXT: [[TMP12:%.*]] = icmp ne <4 x i32> [[TMP9]], zeroinitializer
; CHECK-NEXT: [[TMP13:%.*]] = sext <4 x i1> [[TMP12]] to <4 x i16>
-; CHECK-NEXT: [[TMP14:%.*]] = extractelement <4 x i16> [[TMP13]], i64 0
-; CHECK-NEXT: [[TMP5:%.*]] = insertelement <8 x i16> zeroinitializer, i16 [[TMP14]], i64 0
-; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i16> [[TMP13]], i64 1
-; CHECK-NEXT: [[TMP7:%.*]] = insertelement <8 x i16> [[TMP5]], i16 [[TMP6]], i64 1
-; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i16> [[TMP13]], i64 2
-; CHECK-NEXT: [[TMP15:%.*]] = insertelement <8 x i16> [[TMP7]], i16 [[TMP8]], i64 2
-; CHECK-NEXT: [[TMP16:%.*]] = extractelement <4 x i16> [[TMP13]], i64 3
-; CHECK-NEXT: [[TMP11:%.*]] = insertelement <8 x i16> [[TMP15]], i16 [[TMP16]], i64 3
+; CHECK-NEXT: [[TMP11:%.*]] = shufflevector <4 x i16> [[TMP13]], <4 x i16> zeroinitializer, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT: [[TMP0:%.*]] = tail call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> [[A]], i32 3)
; CHECK-NEXT: [[_MSPROP:%.*]] = shufflevector <8 x i16> [[TMP11]], <8 x i16> splat (i16 -1), <4 x i32> <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <8 x i16> [[TMP0]], <8 x i16> poison, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT: [[_MSCMP1:%.*]] = icmp ne i64 [[TMP10]], 0
-; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB14:.*]], label %[[BB15:.*]], !prof [[PROF1]]
-; CHECK: [[BB14]]:
+; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB7:.*]], label %[[BB8:.*]], !prof [[PROF1]]
+; CHECK: [[BB7]]:
; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
; CHECK-NEXT: unreachable
-; CHECK: [[BB15]]:
+; CHECK: [[BB8]]:
; CHECK-NEXT: [[TMP2:%.*]] = ptrtoint ptr [[D]] to i64
; CHECK-NEXT: [[TMP3:%.*]] = xor i64 [[TMP2]], 87960930222080
; CHECK-NEXT: [[TMP4:%.*]] = inttoptr i64 [[TMP3]] to ptr
@@ -128,25 +114,18 @@ define void @test_x86_vcvtps2ph_128_m2(ptr nocapture %hf4x16, <4 x float> %f4X86
; CHECK-NEXT: call void @llvm.donothing()
; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <4 x i32> [[TMP0]], zeroinitializer
; CHECK-NEXT: [[TMP3:%.*]] = sext <4 x i1> [[TMP2]] to <4 x i16>
-; CHECK-NEXT: [[TMP4:%.*]] = extractelement <4 x i16> [[TMP3]], i64 0
-; CHECK-NEXT: [[TMP5:%.*]] = insertelement <8 x i16> zeroinitializer, i16 [[TMP4]], i64 0
-; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i16> [[TMP3]], i64 1
-; CHECK-NEXT: [[TMP7:%.*]] = insertelement <8 x i16> [[TMP5]], i16 [[TMP6]], i64 1
-; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i16> [[TMP3]], i64 2
-; CHECK-NEXT: [[TMP9:%.*]] = insertelement <8 x i16> [[TMP7]], i16 [[TMP8]], i64 2
-; CHECK-NEXT: [[TMP10:%.*]] = extractelement <4 x i16> [[TMP3]], i64 3
-; CHECK-NEXT: [[TMP14:%.*]] = insertelement <8 x i16> [[TMP9]], i16 [[TMP10]], i64 3
+; CHECK-NEXT: [[TMP14:%.*]] = shufflevector <4 x i16> [[TMP3]], <4 x i16> zeroinitializer, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT: [[TMP11:%.*]] = tail call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> [[F4X86]], i32 3)
; CHECK-NEXT: [[TMP13:%.*]] = bitcast <8 x i16> [[TMP14]] to <2 x i64>
; CHECK-NEXT: [[TMP12:%.*]] = bitcast <8 x i16> [[TMP11]] to <2 x double>
; CHECK-NEXT: [[_MSPROP:%.*]] = extractelement <2 x i64> [[TMP13]], i32 0
; CHECK-NEXT: [[VECEXT:%.*]] = extractelement <2 x double> [[TMP12]], i32 0
; CHECK-NEXT: [[_MSCMP1:%.*]] = icmp ne i64 [[TMP1]], 0
-; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB15:.*]], label %[[BB16:.*]], !prof [[PROF1]]
-; CHECK: [[BB15]]:
+; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB8:.*]], label %[[BB9:.*]], !prof [[PROF1]]
+; CHECK: [[BB8]]:
; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
; CHECK-NEXT: unreachable
-; CHECK: [[BB16]]:
+; CHECK: [[BB9]]:
; CHECK-NEXT: [[TMP15:%.*]] = ptrtoint ptr [[HF4X16]] to i64
; CHECK-NEXT: [[TMP16:%.*]] = xor i64 [[TMP15]], 87960930222080
; CHECK-NEXT: [[TMP17:%.*]] = inttoptr i64 [[TMP16]] to ptr
@@ -171,25 +150,18 @@ define void @test_x86_vcvtps2ph_128_m3(ptr nocapture %hf4x16, <4 x float> %f4X86
; CHECK-NEXT: call void @llvm.donothing()
; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <4 x i32> [[TMP0]], zeroinitializer
; CHECK-NEXT: [[TMP3:%.*]] = sext <4 x i1> [[TMP2]] to <4 x i16>
-; CHECK-NEXT: [[TMP4:%.*]] = extractelement <4 x i16> [[TMP3]], i64 0
-; CHECK-NEXT: [[TMP5:%.*]] = insertelement <8 x i16> zeroinitializer, i16 [[TMP4]], i64 0
-; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i16> [[TMP3]], i64 1
-; CHECK-NEXT: [[TMP7:%.*]] = insertelement <8 x i16> [[TMP5]], i16 [[TMP6]], i64 1
-; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i16> [[TMP3]], i64 2
-; CHECK-NEXT: [[TMP9:%.*]] = insertelement <8 x i16> [[TMP7]], i16 [[TMP8]], i64 2
-; CHECK-NEXT: [[TMP10:%.*]] = extractelement <4 x i16> [[TMP3]], i64 3
-; CHECK-NEXT: [[TMP13:%.*]] = insertelement <8 x i16> [[TMP9]], i16 [[TMP10]], i64 3
+; CHECK-NEXT: [[TMP13:%.*]] = shufflevector <4 x i16> [[TMP3]], <4 x i16> zeroinitializer, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT: [[TMP11:%.*]] = tail call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> [[F4X86]], i32 3)
; CHECK-NEXT: [[TMP12:%.*]] = bitcast <8 x i16> [[TMP13]] to <2 x i64>
; CHECK-NEXT: [[TMP14:%.*]] = bitcast <8 x i16> [[TMP11]] to <2 x i64>
; CHECK-NEXT: [[VECEXT:%.*]] = extractelement <2 x i64> [[TMP12]], i32 0
; CHECK-NEXT: [[VECEXT1:%.*]] = extractelement <2 x i64> [[TMP14]], i32 0
; CHECK-NEXT: [[_MSCMP1:%.*]] = icmp ne i64 [[TMP1]], 0
-; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB15:.*]], label %[[BB16:.*]], !prof [[PROF1]]
-; CHECK: [[BB15]]:
+; CHECK-NEXT: br i1 [[_MSCMP1]], label %[[BB8:.*]], label %[[BB9:.*]], !prof [[PROF1]]
+; CHECK: [[BB8]]:
; CHECK-NEXT: call void @__msan_warning_noreturn() #[[ATTR4]]
; CHECK-NEXT: unreachable
-; CHECK: [[BB16]]:
+; CHECK: [[BB9]]:
; CHECK-NEXT: [[TMP15:%.*]] = ptrtoint ptr [[HF4X16]] to i64
; CHECK-NEXT: [[TMP16:%.*]] = xor i64 [[TMP15]], 87960930222080
; CHECK-NEXT: [[TMP17:%.*]] = inttoptr i64 [[TMP16]] to ptr
>From 83ccaeb9401546e9e7948098b4c6aadcc5da30dd Mon Sep 17 00:00:00 2001
From: Thurston Dang <thurston at google.com>
Date: Tue, 11 Mar 2025 03:12:58 +0000
Subject: [PATCH 3/6] clang-format
---
.../Instrumentation/MemorySanitizer.cpp | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index d649d3bf9944b..cb62f1ff54286 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -3293,10 +3293,12 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
// The return type might have more elements than the input.
// Temporarily shrink the return type's number of elements.
VectorType *ShadowType = cast<VectorType>(getShadowTy(&I));
- if (ShadowType->getElementCount() == cast<VectorType>(Src->getType())->getElementCount() * 2)
+ if (ShadowType->getElementCount() ==
+ cast<VectorType>(Src->getType())->getElementCount() * 2)
ShadowType = VectorType::getHalfElementsVectorType(ShadowType);
- assert(ShadowType->getElementCount() == cast<VectorType>(Src->getType())->getElementCount());
+ assert(ShadowType->getElementCount() ==
+ cast<VectorType>(Src->getType())->getElementCount());
IRBuilder<> IRB(&I);
Value *S0 = getShadow(&I, 0);
@@ -3306,8 +3308,8 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
/// - fully uninitialized if *any* bit of the input is uninitialized
/// - fully ininitialized if all bits of the input are ininitialized
/// We apply the same principle on a per-field basis for vectors.
- Value *Shadow = IRB.CreateSExt(IRB.CreateICmpNE(S0, getCleanShadow(S0)),
- ShadowType);
+ Value *Shadow =
+ IRB.CreateSExt(IRB.CreateICmpNE(S0, getCleanShadow(S0)), ShadowType);
// The return type might have more elements than the input.
// Extend the return type back to its original width if necessary.
@@ -3317,18 +3319,20 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
FullShadow = Shadow;
else {
SmallVector<int, 8> ShadowMask;
- for (unsigned X = 0; X < cast<FixedVectorType>(FullShadow->getType())->getNumElements(); ++X)
+ for (unsigned X = 0;
+ X < cast<FixedVectorType>(FullShadow->getType())->getNumElements();
+ ++X)
ShadowMask.push_back(X);
// Append zeros
- FullShadow = IRB.CreateShuffleVector(Shadow, getCleanShadow(Shadow), ShadowMask);
+ FullShadow =
+ IRB.CreateShuffleVector(Shadow, getCleanShadow(Shadow), ShadowMask);
}
setShadow(&I, FullShadow);
setOriginForNaryOp(I);
}
-
// Instrument x86 SSE vector convert intrinsic.
//
// This function instruments intrinsics like cvtsi2ss:
>From 4857c2356ec077b3ef01c16b48bd94023339c44a Mon Sep 17 00:00:00 2001
From: Thurston Dang <thurston at google.com>
Date: Tue, 11 Mar 2025 03:15:47 +0000
Subject: [PATCH 4/6] maybe_unused
---
llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index cb62f1ff54286..2f4a00d359ce9 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -3287,7 +3287,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
assert(I.arg_size() == 2);
Value *Src = I.getArgOperand(0);
assert(Src->getType()->isVectorTy());
- Value *RoundingMode = I.getArgOperand(1);
+ [[maybe_unused]] Value *RoundingMode = I.getArgOperand(1);
assert(RoundingMode->getType()->isIntegerTy());
// The return type might have more elements than the input.
>From 6950c8cb1611032fe34be77bbe67b137fba90f73 Mon Sep 17 00:00:00 2001
From: Thurston Dang <thurston at google.com>
Date: Tue, 11 Mar 2025 03:45:18 +0000
Subject: [PATCH 5/6] Remove branch weights assertion
---
.../Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll | 3 ---
1 file changed, 3 deletions(-)
diff --git a/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll b/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
index 253bab5cb4bd5..e663a7bfeef24 100644
--- a/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
+++ b/llvm/test/Instrumentation/MemorySanitizer/X86/f16c-intrinsics.ll
@@ -178,6 +178,3 @@ entry:
}
attributes #0 = { sanitize_memory }
-;.
-; CHECK: [[PROF1]] = !{!"branch_weights", i32 1, i32 1048575}
-;.
>From 88448ccf1fe16259d2b3c96eb7a97a86fde4ceeb Mon Sep 17 00:00:00 2001
From: Thurston Dang <thurston at google.com>
Date: Thu, 13 Mar 2025 15:54:37 +0000
Subject: [PATCH 6/6] Use iota for real integers
---
.../Transforms/Instrumentation/MemorySanitizer.cpp | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index 2f4a00d359ce9..49c8d384dfe73 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -207,6 +207,7 @@
#include <cstddef>
#include <cstdint>
#include <memory>
+#include <numeric>
#include <string>
#include <tuple>
@@ -3315,14 +3316,12 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
// Extend the return type back to its original width if necessary.
Value *FullShadow = getCleanShadow(&I);
- if (Shadow->getType() == FullShadow->getType())
+ if (Shadow->getType() == FullShadow->getType()) {
FullShadow = Shadow;
- else {
- SmallVector<int, 8> ShadowMask;
- for (unsigned X = 0;
- X < cast<FixedVectorType>(FullShadow->getType())->getNumElements();
- ++X)
- ShadowMask.push_back(X);
+ } else {
+ SmallVector<int, 8> ShadowMask(
+ cast<FixedVectorType>(FullShadow->getType())->getNumElements());
+ std::iota(ShadowMask.begin(), ShadowMask.end(), 0);
// Append zeros
FullShadow =
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