Reduce x - y to -y when we know the 'x' part will get masked off anyways.

[oota-llvm.git] / test / Transforms / InstCombine / 2008-07-08-SubAnd.ll

; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep -v {i32 8}
; PR2330

define i32 @a(i32 %a) nounwind  {
entry:
        %tmp2 = sub i32 8, %a           ; <i32> [#uses=1]
        %tmp3 = and i32 %tmp2, 7                ; <i32> [#uses=1]
        ret i32 %tmp3
}