derek.holloway
7502bf64a4
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33 lines
968 B
LLVM
33 lines
968 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=reassociate,instcombine,dce -S | FileCheck %s
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; With sub reassociation, constant folding can eliminate all of the constants.
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define i32 @test1(i32 %A, i32 %B) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[Z:%.*]] = sub i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%W = add i32 5, %B
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%X = add i32 -7, %A
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%Y = sub i32 %X, %W
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%Z = add i32 %Y, 12
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ret i32 %Z
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}
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; With sub reassociation, constant folding can eliminate the two 12 constants.
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define i32 @test2(i32 %A, i32 %B, i32 %C, i32 %D) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[B:%.*]], [[A:%.*]]
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; CHECK-NEXT: [[TMP2:%.*]] = add i32 [[TMP1]], [[C:%.*]]
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; CHECK-NEXT: [[Q:%.*]] = sub i32 [[D:%.*]], [[TMP2]]
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; CHECK-NEXT: ret i32 [[Q]]
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;
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%M = add i32 %A, 12
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%N = add i32 %M, %B
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%O = add i32 %N, %C
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%P = sub i32 %D, %O
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%Q = add i32 %P, 12
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ret i32 %Q
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}
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