llvm/llvm/test/CodeGen/X86/pr12889.ll

; RUN: llc < %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "i686-unknown-linux-gnu"

@c0 = common global i8 0, align 1

define void @func() nounwind uwtable {
entry:
  %0 = load i8, ptr @c0, align 1
  %tobool = icmp ne i8 %0, 0
  %conv = zext i1 %tobool to i8
  %storemerge = shl nuw nsw i8 %conv, %conv
  store i8 %storemerge, ptr @c0, align 1
  ret void
}