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llvm-mirror/test/Transforms/InstSimplify/AndOrXor.ll

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; RUN: opt < %s -instsimplify -S | FileCheck %s
define i64 @pow2(i32 %x) {
; CHECK-LABEL: @pow2(
%negx = sub i32 0, %x
%x2 = and i32 %x, %negx
%e = zext i32 %x2 to i64
%nege = sub i64 0, %e
%e2 = and i64 %e, %nege
ret i64 %e2
; CHECK: ret i64 %e
}
define i64 @pow2b(i32 %x) {
; CHECK-LABEL: @pow2b(
%sh = shl i32 2, %x
%e = zext i32 %sh to i64
%nege = sub i64 0, %e
%e2 = and i64 %e, %nege
ret i64 %e2
; CHECK: ret i64 %e
}