1
0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-01 08:23:21 +01:00
llvm-mirror/test/Transforms/InstCombine/2010-11-01-lshr-mask.ll
Owen Anderson 47f0efad86 When folding away a (shl (shr)) pair, we need to check that the bits that will BECOME the low
bits are zero, not that the current low bits are zero.  Fixes <rdar://problem/8606771>.

llvm-svn: 117953
2010-11-01 21:08:20 +00:00

21 lines
573 B
LLVM

; RUN: opt -instcombine -S < %s | FileCheck %s
; <rdar://problem/8606771>
define i32 @main(i32 %argc) nounwind ssp {
entry:
%tmp3151 = trunc i32 %argc to i8
%tmp3161 = or i8 %tmp3151, -17
%tmp3162 = and i8 %tmp3151, 122
%tmp3163 = xor i8 %tmp3162, -17
%tmp4114 = shl i8 %tmp3163, 6
%tmp4115 = xor i8 %tmp4114, %tmp3163
%tmp4120 = xor i8 %tmp3161, %tmp4115
; CHECK: lshr i8 %tmp4115, 1
; CHECK-NOT: shl i8 %tmp4126, 6
%tmp4126 = lshr i8 %tmp4120, 7
%tmp4127 = mul i8 %tmp4126, 64
%tmp4086 = zext i8 %tmp4127 to i32
; CHECK: ret i32
ret i32 %tmp4086
}