Author: lattner
Date: Mon Dec 24 13:27:46 2007
New Revision: 45343
URL: http://llvm.org/viewvc/llvm-project?rev=45343&view=rev
Log:
add a simple hack
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=45343&r1=45342&r2=45343&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/README.txt (original)
+++ llvm/trunk/lib/Target/X86/README.txt Mon Dec 24 13:27:46 2007
@@ -1573,3 +1573,15 @@
//===---------------------------------------------------------------------===//
+We can fold a store into "zeroing a reg". Instead of:
+
+xorl %eax, %eax
+movl %eax, 124(%esp)
+
+we should get:
+
+movl $0, 124(%esp)
+
+if the flags of the xor are dead.
+
+//===---------------------------------------------------------------------===//
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