From 312c3e5f39899e07c7f73e6687b8eeca1d6363cd Mon Sep 17 00:00:00 2001
From: David Majnemer <david.majnemer@gmail.com>
Date: Sun, 19 Oct 2014 08:32:32 +0000
Subject: InstCombine: (sub (or A B) (xor A B)) --> (and A B)

The following implements the transformation:
(sub (or A B) (xor A B)) --> (and A B).

Patch by Ankur Garg!

Differential Revision: http://reviews.llvm.org/D5719

llvm-svn: 220163
---
 llvm/test/Transforms/InstCombine/sub.ll | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'llvm/test/Transforms')

diff --git a/llvm/test/Transforms/InstCombine/sub.ll b/llvm/test/Transforms/InstCombine/sub.ll
index 1d1bedc0a7b..95a61b1747c 100644
--- a/llvm/test/Transforms/InstCombine/sub.ll
+++ b/llvm/test/Transforms/InstCombine/sub.ll
@@ -530,3 +530,13 @@ define i32 @test44(i32 %x) {
 ; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 %x, -32768
 ; CHECK: ret i32 [[ADD]]
 }
+
+define i32 @test45(i32 %x, i32 %y) {
+  %or = or i32 %x, %y
+  %xor = xor i32 %x, %y
+  %sub = sub i32 %or, %xor
+  ret i32 %sub
+; CHECK-LABEL: @test45(
+; CHECK-NEXT: %sub = and i32 %x, %y
+; CHECK: ret i32 %sub
+}
-- 
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