104 lines
3.4 KiB
LLVM
104 lines
3.4 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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;
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; Test cases in this file are intended to be run with both reassociate and
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; gvn passes enabled.
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;
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; Test numbering remains continuous across:
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; - InstCombine/fast-basictest.ll
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; - PhaseOrdering/fast-basictest.ll
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; - PhaseOrdering/fast-reassociate-gvn.ll
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; - Reassociate/fast-basictest.ll
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;
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; RUN: opt < %s -passes=reassociate,gvn -S | FileCheck %s --check-prefixes=CHECK,REASSOC_AND_GVN --allow-unused-prefixes
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; RUN: opt < %s -O2 -S | FileCheck %s --check-prefixes=CHECK,O2 --allow-unused-prefixes
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@fe = external global float
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@fa = external global float
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@fb = external global float
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@fc = external global float
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@ff = external global float
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; If two sums of the same operands in different order are counted with 'fast'
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; flag and then stored to global variables, we can reuse the same value twice.
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; Sums:
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; - test3: (a+b)+c and (a+c)+b
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; - test4: c+(a+b) and (c+a)+b
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; - test5: c+(b+a) and (c+a)+b
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; TODO: check if 'reassoc' flag is technically enough for this optimization
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; (currently the transformation is not done with 'reassoc' only).
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define void @test3() {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[A:%.*]] = load float, ptr @fa, align 4
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; CHECK-NEXT: [[B:%.*]] = load float, ptr @fb, align 4
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; CHECK-NEXT: [[C:%.*]] = load float, ptr @fc, align 4
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; CHECK-NEXT: [[T1:%.*]] = fadd fast float [[B]], [[A]]
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; CHECK-NEXT: [[T2:%.*]] = fadd fast float [[T1]], [[C]]
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; CHECK-NEXT: store float [[T2]], ptr @fe, align 4
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; CHECK-NEXT: store float [[T2]], ptr @ff, align 4
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; CHECK-NEXT: ret void
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;
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%A = load float, ptr @fa
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%B = load float, ptr @fb
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%C = load float, ptr @fc
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%t1 = fadd fast float %A, %B
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%t2 = fadd fast float %t1, %C
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%t3 = fadd fast float %A, %C
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%t4 = fadd fast float %t3, %B
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; e = (a+b)+c;
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store float %t2, ptr @fe
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; f = (a+c)+b
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store float %t4, ptr @ff
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ret void
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}
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define void @test4() {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[A:%.*]] = load float, ptr @fa, align 4
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; CHECK-NEXT: [[B:%.*]] = load float, ptr @fb, align 4
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; CHECK-NEXT: [[C:%.*]] = load float, ptr @fc, align 4
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; CHECK-NEXT: [[T1:%.*]] = fadd fast float [[B]], [[A]]
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; CHECK-NEXT: [[T2:%.*]] = fadd fast float [[T1]], [[C]]
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; CHECK-NEXT: store float [[T2]], ptr @fe, align 4
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; CHECK-NEXT: store float [[T2]], ptr @ff, align 4
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; CHECK-NEXT: ret void
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;
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%A = load float, ptr @fa
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%B = load float, ptr @fb
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%C = load float, ptr @fc
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%t1 = fadd fast float %A, %B
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%t2 = fadd fast float %C, %t1
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%t3 = fadd fast float %C, %A
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%t4 = fadd fast float %t3, %B
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; e = c+(a+b)
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store float %t2, ptr @fe
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; f = (c+a)+b
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store float %t4, ptr @ff
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ret void
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}
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define void @test5() {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: [[A:%.*]] = load float, ptr @fa, align 4
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; CHECK-NEXT: [[B:%.*]] = load float, ptr @fb, align 4
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; CHECK-NEXT: [[C:%.*]] = load float, ptr @fc, align 4
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; CHECK-NEXT: [[T1:%.*]] = fadd fast float [[B]], [[A]]
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; CHECK-NEXT: [[T2:%.*]] = fadd fast float [[T1]], [[C]]
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; CHECK-NEXT: store float [[T2]], ptr @fe, align 4
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; CHECK-NEXT: store float [[T2]], ptr @ff, align 4
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; CHECK-NEXT: ret void
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;
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%A = load float, ptr @fa
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%B = load float, ptr @fb
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%C = load float, ptr @fc
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%t1 = fadd fast float %B, %A
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%t2 = fadd fast float %C, %t1
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%t3 = fadd fast float %C, %A
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%t4 = fadd fast float %t3, %B
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; e = c+(b+a)
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store float %t2, ptr @fe
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; f = (c+a)+b
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store float %t4, ptr @ff
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ret void
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}
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