From 25a6ab0144f5e206729cb38da654c256d1672aac Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Mon, 26 Jul 2010 21:48:35 +0000
Subject: [PATCH] Add a note

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109448 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/README.txt | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/Target/ARM/README.txt b/lib/Target/ARM/README.txt
index ba4e5da5a05..c31f22766af 100644
--- a/lib/Target/ARM/README.txt
+++ b/lib/Target/ARM/README.txt
@@ -636,3 +636,24 @@ A custom Thumb version would also be a slight improvement over the generic
 version.
 
 //===---------------------------------------------------------------------===//
+
+Consider the following simple C code:
+
+void foo(unsigned char *a, unsigned char *b, int *c) {
+ if ((*a | *b) == 0) *c = 0;
+}
+
+currently llvm-gcc generates something like this (nice branchless code I'd say):
+
+       ldrb    r0, [r0]
+       ldrb    r1, [r1]
+       orr     r0, r1, r0
+       tst     r0, #255
+       moveq   r0, #0
+       streq   r0, [r2]
+       bx      lr
+
+Note that both "tst" and "moveq" are redundant.
+
+//===---------------------------------------------------------------------===//
+