Author: lattner
Date: Wed Dec 5 16:58:19 2007
New Revision: 44637
URL: http://llvm.org/viewvc/llvm-project?rev=44637&view=rev
Log:
add a note
Modified:
llvm/trunk/lib/Target/X86/README.txt
Modified: llvm/trunk/lib/Target/X86/README.txt
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/README.txt?rev=44637&r1=44636&r2=44637&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/README.txt (original)
+++ llvm/trunk/lib/Target/X86/README.txt Wed Dec 5 16:58:19 2007
@@ -1532,3 +1532,23 @@
ret
This should just fldl directly from the input stack slot.
+
+//===---------------------------------------------------------------------===//
+
+This code:
+int foo (int x) { return (x & 65535) | 255; }
+
+Should compile into:
+
+_foo:
+ movzwl 4(%esp), %eax
+ orb $-1, %al ;; 'orl 255' is also fine :)
+ ret
+
+instead of:
+_foo:
+ movl $255, %eax
+ orl 4(%esp), %eax
+ andl $65535, %eax
+ ret
+
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