[llvm-commits] [llvm] r123315 - /llvm/trunk/lib/Target/ARM/README-Thumb.txt

[Nick Lewycky]

Author: nicholas
Date: Wed Jan 12 03:06:19 2011
New Revision: 123315

URL: http://llvm.org/viewvc/llvm-project?rev=123315&view=rev
Log:
Add another note taken from the gcc bugzilla.

Modified:
    llvm/trunk/lib/Target/ARM/README-Thumb.txt

Modified: llvm/trunk/lib/Target/ARM/README-Thumb.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/README-Thumb.txt?rev=123315&r1=123314&r2=123315&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/README-Thumb.txt (original)
+++ llvm/trunk/lib/Target/ARM/README-Thumb.txt Wed Jan 12 03:06:19 2011
@@ -68,7 +68,7 @@
 
 //===---------------------------------------------------------------------===//
 
-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 @@
 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.