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https://github.com/c64scene-ar/llvm-6502.git
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45 lines
779 B
LLVM
45 lines
779 B
LLVM
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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; PR8862
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; CHECK: @shift1
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; CHECK: ret i32 %A
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define i32 @shift1(i32 %A, i32 %B) {
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%C = lshr exact i32 %A, %B
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%D = shl nuw i32 %C, %B
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ret i32 %D
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}
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; CHECK: @shift2
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; CHECK: lshr
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; CHECK: ret i32 %D
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define i32 @shift2(i32 %A, i32 %B) {
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%C = lshr i32 %A, %B
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%D = shl nuw i32 %C, %B
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ret i32 %D
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}
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; CHECK: @shift3
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; CHECK: ret i32 %A
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define i32 @shift3(i32 %A, i32 %B) {
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%C = ashr exact i32 %A, %B
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%D = shl nuw i32 %C, %B
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ret i32 %D
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}
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; CHECK: @shift4
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; CHECK: ret i32 %A
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define i32 @shift4(i32 %A, i32 %B) {
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%C = shl nuw i32 %A, %B
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%D = lshr i32 %C, %B
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ret i32 %D
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}
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; CHECK: @shift5
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; CHECK: ret i32 %A
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define i32 @shift5(i32 %A, i32 %B) {
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%C = shl nsw i32 %A, %B
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%D = ashr i32 %C, %B
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ret i32 %D
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}
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