derek.holloway
7502bf64a4
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80 lines
3.0 KiB
LLVM
80 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=reassociate -S | FileCheck %s
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; Test that we can turn things like X*-(Y*Z) -> X*-1*Y*Z.
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define i32 @test1(i32 %a, i32 %b, i32 %z) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[E:%.*]] = mul i32 [[A:%.*]], 12345
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; CHECK-NEXT: [[F:%.*]] = mul i32 [[E]], [[B:%.*]]
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; CHECK-NEXT: [[G:%.*]] = mul i32 [[F]], [[Z:%.*]]
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; CHECK-NEXT: ret i32 [[G]]
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;
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%c = sub i32 0, %z
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%d = mul i32 %a, %b
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%e = mul i32 %c, %d
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%f = mul i32 %e, 12345
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%g = sub i32 0, %f
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ret i32 %g
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}
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define i32 @test2(i32 %a, i32 %b, i32 %z) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[E:%.*]] = mul i32 [[A:%.*]], 40
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; CHECK-NEXT: [[F:%.*]] = mul i32 [[E]], [[Z:%.*]]
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; CHECK-NEXT: ret i32 [[F]]
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;
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%d = mul i32 %z, 40
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%c = sub i32 0, %d
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%e = mul i32 %a, %c
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%f = sub i32 0, %e
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ret i32 %f
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}
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define <2 x i32> @negate_vec_poisons(<2 x i32> %a, <2 x i32> %b, <2 x i32> %z) {
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; CHECK-LABEL: @negate_vec_poisons(
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; CHECK-NEXT: [[E:%.*]] = mul <2 x i32> [[A:%.*]], splat (i32 40)
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; CHECK-NEXT: [[F:%.*]] = mul <2 x i32> [[E]], [[Z:%.*]]
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; CHECK-NEXT: ret <2 x i32> [[F]]
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;
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%d = mul <2 x i32> %z, <i32 40, i32 40>
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%c = sub <2 x i32> <i32 0, i32 poison>, %d
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%e = mul <2 x i32> %a, %c
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%f = sub <2 x i32> <i32 0, i32 poison>, %e
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ret <2 x i32> %f
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}
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; Replacing %x with a partial undef negation is a miscompile.
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define <2 x i32> @PR57683(<2 x i32> %x) {
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; CHECK-LABEL: @PR57683(
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; CHECK-NEXT: [[PARTIAL_NEG:%.*]] = sub <2 x i32> <i32 poison, i32 0>, [[X:%.*]]
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; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <2 x i32> [[PARTIAL_NEG]], <2 x i32> [[X]], <2 x i32> <i32 1, i32 3>
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; CHECK-NEXT: [[X_NEG:%.*]] = sub <2 x i32> zeroinitializer, [[X]]
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; CHECK-NEXT: [[SUB:%.*]] = add <2 x i32> [[X_NEG]], splat (i32 1)
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; CHECK-NEXT: [[R:%.*]] = add <2 x i32> [[SUB]], [[SHUF]]
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; CHECK-NEXT: ret <2 x i32> [[R]]
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;
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%partial_neg = sub <2 x i32> <i32 poison, i32 0>, %x
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%shuf = shufflevector <2 x i32> %partial_neg, <2 x i32> %x, <2 x i32> <i32 1, i32 3>
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%sub = sub <2 x i32> <i32 1, i32 1>, %x
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%r = add <2 x i32> %sub, %shuf
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ret <2 x i32> %r
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}
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define <2 x float> @PR57683_FP(<2 x float> %x) {
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; CHECK-LABEL: @PR57683_FP(
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; CHECK-NEXT: [[PARTIAL_NEG:%.*]] = fsub reassoc nsz <2 x float> <float poison, float 0.000000e+00>, [[X:%.*]]
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; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <2 x float> [[PARTIAL_NEG]], <2 x float> [[X]], <2 x i32> <i32 1, i32 3>
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; CHECK-NEXT: [[X_NEG:%.*]] = fneg reassoc nsz <2 x float> [[X]]
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; CHECK-NEXT: [[SUB:%.*]] = fadd reassoc nsz <2 x float> [[X_NEG]], splat (float 1.000000e+00)
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; CHECK-NEXT: [[R:%.*]] = fadd reassoc nsz <2 x float> [[SUB]], [[SHUF]]
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; CHECK-NEXT: ret <2 x float> [[R]]
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;
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%partial_neg = fsub reassoc nsz <2 x float> <float poison, float 0.0>, %x
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%shuf = shufflevector <2 x float> %partial_neg, <2 x float> %x, <2 x i32> <i32 1, i32 3>
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%sub = fsub reassoc nsz <2 x float> <float 1.0, float 1.0>, %x
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%r = fadd reassoc nsz <2 x float> %sub, %shuf
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ret <2 x float> %r
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}
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