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eb2be34094
Particularly, it addresses cases where Reassociate breaks Subtracts but then fails to optimize combinations like I1 + -I2 where I1 and I2 have the same rank and are identical. Patch by Dmitri Shtilman. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219092 91177308-0d34-0410-b5e6-96231b3b80d8
16 lines
310 B
LLVM
16 lines
310 B
LLVM
; RUN: opt < %s -reassociate -instcombine -S | FileCheck %s
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; Test that we can turn things like A*B + X - A*B -> X.
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define i32 @test1(i32 %a, i32 %b, i32 %x) {
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; CHECK-LABEL: test1
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; CHECK: ret i32 %x
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%c = mul i32 %a, %b
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%d = add i32 %c, %x
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%c1 = mul i32 %a, %b
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%f = sub i32 %d, %c1
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ret i32 %f
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}
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