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0c73079855
a subtract is cheaper than a multiply. This generalizes an existing transform. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59800 91177308-0d34-0410-b5e6-96231b3b80d8
35 lines
622 B
LLVM
35 lines
622 B
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t
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; RUN: grep urem %t | count 3
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; RUN: grep srem %t | count 1
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; RUN: grep sub %t | count 2
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; RUN: grep add %t | count 1
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; PR3103
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define i8 @test1(i8 %x, i8 %y) {
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%A = udiv i8 %x, %y
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%B = mul i8 %A, %y
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%C = sub i8 %x, %B
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ret i8 %C
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}
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define i8 @test2(i8 %x, i8 %y) {
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%A = sdiv i8 %x, %y
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%B = mul i8 %A, %y
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%C = sub i8 %x, %B
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ret i8 %C
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}
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define i8 @test3(i8 %x, i8 %y) {
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%A = udiv i8 %x, %y
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%B = mul i8 %A, %y
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%C = sub i8 %B, %x
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ret i8 %C
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}
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define i8 @test4(i8 %x) {
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%A = udiv i8 %x, 3
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%B = mul i8 %A, -3
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%C = sub i8 %x, %B
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ret i8 %C
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}
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