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; RUN: opt < %s -instsimplify -S | FileCheck %s
; PR8862
; CHECK-LABEL: @shift1(
; CHECK: ret i32 %A
define i32 @shift1(i32 %A, i32 %B) {
%C = lshr exact i32 %A, %B
%D = shl nuw i32 %C, %B
ret i32 %D
}
; CHECK-LABEL: @shift2(
; CHECK: lshr
; CHECK: ret i32 %D
define i32 @shift2(i32 %A, i32 %B) {
%C = lshr i32 %A, %B
%D = shl nuw i32 %C, %B
ret i32 %D
}
; CHECK-LABEL: @shift3(
; CHECK: ret i32 %A
define i32 @shift3(i32 %A, i32 %B) {
%C = ashr exact i32 %A, %B
%D = shl nuw i32 %C, %B
ret i32 %D
}
; CHECK-LABEL: @shift4(
; CHECK: ret i32 %A
define i32 @shift4(i32 %A, i32 %B) {
%C = shl nuw i32 %A, %B
%D = lshr i32 %C, %B
ret i32 %D
}
; CHECK-LABEL: @shift5(
; CHECK: ret i32 %A
define i32 @shift5(i32 %A, i32 %B) {
%C = shl nsw i32 %A, %B
%D = ashr i32 %C, %B
ret i32 %D
}
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