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[InstSimplify] Fold insertelement vec, poison, idx into vec

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This is a simple patch that adds folding from `insertelement vec, poison, idx` into `vec`.

Alive2 proof: https://alive2.llvm.org/ce/z/2y2vbC

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D93994
This commit is contained in:
Juneyoung Lee 2021-01-04 02:02:19 +09:00
parent d269d5e555
commit 871d4c4165
5 changed files with 11 additions and 14 deletions
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8
lib/Analysis/InstructionSimplify.cpp
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@ -4401,10 +4401,10 @@ Value *llvm::SimplifyInsertElementInst(Value *Vec, Value *Val, Value *Idx,
if (Q.isUndefValue(Idx))
return PoisonValue::get(Vec->getType());
// If the scalar is undef, and there is no risk of propagating poison from the
// vector value, simplify to the vector value.
if (Q.isUndefValue(Val) &&
isGuaranteedNotToBeUndefOrPoison(Vec))
// If the scalar is poison, or it is undef and there is no risk of
// propagating poison from the vector value, simplify to the vector value.
if (isa<PoisonValue>(Val) ||
(Q.isUndefValue(Val) && isGuaranteedNotToBePoison(Vec)))
return Vec;
// If we are extracting a value from a vector, then inserting it into the same

3
test/Transforms/InstCombine/extractelement-inseltpoison.ll
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@ -319,8 +319,7 @@ define <4 x double> @invalid_extractelement(<2 x double> %a, <4 x double> %b, do
; ANY-NEXT: [[T4:%.*]] = shufflevector <4 x double> [[B:%.*]], <4 x double> [[TMP1]], <4 x i32> <i32 undef, i32 1, i32 4, i32 3>
; ANY-NEXT: [[E:%.*]] = extractelement <4 x double> [[B]], i32 1
; ANY-NEXT: store double [[E]], double* [[P:%.*]], align 8
; ANY-NEXT: [[R:%.*]] = insertelement <4 x double> [[T4]], double poison, i64 0
; ANY-NEXT: ret <4 x double> [[R]]
; ANY-NEXT: ret <4 x double> [[T4]]
;
%t3 = extractelement <2 x double> %a, i32 0
%t4 = insertelement <4 x double> %b, double %t3, i32 2

3
test/Transforms/InstCombine/extractelement.ll
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@ -319,8 +319,7 @@ define <4 x double> @invalid_extractelement(<2 x double> %a, <4 x double> %b, do
; ANY-NEXT: [[T4:%.*]] = shufflevector <4 x double> [[B:%.*]], <4 x double> [[TMP1]], <4 x i32> <i32 undef, i32 1, i32 4, i32 3>
; ANY-NEXT: [[E:%.*]] = extractelement <4 x double> [[B]], i32 1
; ANY-NEXT: store double [[E]], double* [[P:%.*]], align 8
; ANY-NEXT: [[R:%.*]] = insertelement <4 x double> [[T4]], double poison, i64 0
; ANY-NEXT: ret <4 x double> [[R]]
; ANY-NEXT: ret <4 x double> [[T4]]
;
%t3 = extractelement <2 x double> %a, i32 0
%t4 = insertelement <4 x double> %b, double %t3, i32 2

3
test/Transforms/InstSimplify/insertelement.ll
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@ -52,8 +52,7 @@ define <4 x i32> @test5_poison(<4 x i32> %A) {
define <4 x i32> @elem_poison(<4 x i32> %A) {
; CHECK-LABEL: @elem_poison(
; CHECK-NEXT: [[B:%.*]] = insertelement <4 x i32> [[A:%.*]], i32 poison, i32 1
; CHECK-NEXT: ret <4 x i32> [[B]]
; CHECK-NEXT: ret <4 x i32> [[A:%.*]]
;
%B = insertelement <4 x i32> %A, i32 poison, i32 1
ret <4 x i32> %B

8
test/Transforms/SLPVectorizer/X86/alternate-int.ll
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@ -425,10 +425,10 @@ define <8 x i32> @sdiv_v8i32_undefs(<8 x i32> %a) {
; CHECK-NEXT: [[AB5:%.*]] = sdiv i32 [[A5]], 4
; CHECK-NEXT: [[AB6:%.*]] = sdiv i32 [[A6]], 8
; CHECK-NEXT: [[AB7:%.*]] = sdiv i32 [[A7]], 16
; CHECK-NEXT: [[TMP1:%.*]] = insertelement <8 x i32> poison, i32 [[AB1]], i32 1
; CHECK-NEXT: [[TMP2:%.*]] = insertelement <8 x i32> [[TMP1]], i32 [[AB2]], i32 2
; CHECK-NEXT: [[R4:%.*]] = insertelement <8 x i32> [[TMP2]], i32 [[AB3]], i32 3
; CHECK-NEXT: [[R5:%.*]] = insertelement <8 x i32> [[R4]], i32 [[AB5]], i32 5
; CHECK-NEXT: [[R1:%.*]] = insertelement <8 x i32> <i32 poison, i32 poison, i32 poison, i32 poison, i32 undef, i32 poison, i32 poison, i32 poison>, i32 [[AB1]], i32 1
; CHECK-NEXT: [[R2:%.*]] = insertelement <8 x i32> [[R1]], i32 [[AB2]], i32 2
; CHECK-NEXT: [[R3:%.*]] = insertelement <8 x i32> [[R2]], i32 [[AB3]], i32 3
; CHECK-NEXT: [[R5:%.*]] = insertelement <8 x i32> [[R3]], i32 [[AB5]], i32 5
; CHECK-NEXT: [[R6:%.*]] = insertelement <8 x i32> [[R5]], i32 [[AB6]], i32 6
; CHECK-NEXT: [[R7:%.*]] = insertelement <8 x i32> [[R6]], i32 [[AB7]], i32 7
; CHECK-NEXT: ret <8 x i32> [[R7]]