From: Nick Lewycky <nicholas@mxc.ca>
Date: Wed, 12 Jan 2011 09:06:19 +0000 (+0000)
Subject: Add another note taken from the gcc bugzilla.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=e45f2dfde651c01aafa73e7708ebd76881427690;p=oota-llvm.git

Add another note taken from the gcc bugzilla.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123315 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/README-Thumb.txt b/lib/Target/ARM/README-Thumb.txt
index 6b605bb0a7c..463c440852f 100644
--- a/lib/Target/ARM/README-Thumb.txt
+++ b/lib/Target/ARM/README-Thumb.txt
@@ -68,7 +68,7 @@ LPCRELL0:
 
 //===---------------------------------------------------------------------===//
 
-We compiles the following:
+We compile the following:
 
 define i16 @func_entry_2E_ce(i32 %i) {
         switch i32 %i, label %bb12.exitStub [
@@ -246,3 +246,22 @@ Thumb2.
 Rather than having tBR_JTr print a ".align 2" and constant island pass pad it,
 add a target specific ALIGN instruction instead. That way, GetInstSizeInBytes
 won't have to over-estimate. It can also be used for loop alignment pass.
+
+//===---------------------------------------------------------------------===//
+
+We generate conditional code for icmp when we don't need to. This code:
+
+  int foo(int s) {
+    return s == 1;
+  }
+
+produces:
+
+foo:
+        cmp     r0, #1
+        mov.w   r0, #0
+        it      eq
+        moveq   r0, #1
+        bx      lr
+
+when it could use subs + adcs. This is GCC PR46975.