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18 lines
798 B
LLVM
18 lines
798 B
LLVM
; This entire chain of computation should be optimized away, but
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; wasn't because the two multiplies were not detected as being identical.
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;
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; RUN: llvm-as < %s | opt -gcse -instcombine -dce | \
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; RUN: llvm-dis | not grep sub
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define i32 @vnum_test4(i32* %data) {
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%idx1 = getelementptr i32* %data, i64 1 ; <i32*> [#uses=1]
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%idx2 = getelementptr i32* %data, i64 3 ; <i32*> [#uses=1]
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%reg1101 = load i32* %idx1 ; <i32> [#uses=2]
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%reg1111 = load i32* %idx2 ; <i32> [#uses=2]
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%reg109 = mul i32 %reg1101, %reg1111 ; <i32> [#uses=1]
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%reg108 = mul i32 %reg1111, %reg1101 ; <i32> [#uses=1]
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%reg121 = sub i32 %reg108, %reg109 ; <i32> [#uses=1]
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ret i32 %reg121
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}
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