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Add instcombine patterns for the following transformations:

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(x & y) | (x ^ y) -> x | y 
 (x & y) + (x ^ y) -> x | y 

Patch by Manman Ren.
rdar://10770603


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155674 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier
2012-04-26 23:29:14 +00:00
parent 0d5c32327a
commit c1fc5e4464
3 changed files with 43 additions and 0 deletions
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24
test/Transforms/InstCombine/and-xor-or.ll Normal file
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@@ -0,0 +1,24 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
; rdar://10770603
; (x & y) | (x ^ y) -> x | y
define i64 @or(i64 %x, i64 %y) nounwind uwtable readnone ssp {
%1 = and i64 %y, %x
%2 = xor i64 %y, %x
%3 = add i64 %1, %2
ret i64 %3
; CHECK: @or
; CHECK: or i64
; CHECK-NEXT: ret
}
; (x & y) + (x ^ y) -> x | y
define i64 @or2(i64 %x, i64 %y) nounwind uwtable readnone ssp {
%1 = and i64 %y, %x
%2 = xor i64 %y, %x
%3 = or i64 %1, %2
ret i64 %3
; CHECK: @or2
; CHECK: or i64
; CHECK-NEXT: ret
}