[llvm-commits] CVS: llvm/lib/Target/X86/README.txt

[Evan Cheng]

Changes in directory llvm/lib/Target/X86:

README.txt updated: 1.55 -> 1.56
---
Log message:

Remind ourselves to revisit the "pxor vs. xorps/xorpd to clear XMM registers"
issue. Need to do more experiments.


---
Diffs of the changes:  (+6 -0)

 README.txt |    6 ++++++
 1 files changed, 6 insertions(+)


Index: llvm/lib/Target/X86/README.txt
diff -u llvm/lib/Target/X86/README.txt:1.55 llvm/lib/Target/X86/README.txt:1.56
--- llvm/lib/Target/X86/README.txt:1.55	Thu Feb 16 18:00:58 2006
+++ llvm/lib/Target/X86/README.txt	Thu Feb 16 18:04:28 2006
@@ -437,3 +437,9 @@
 	movw al, 8(%edx)
 	
 when we can spare a register. It reduces code size.
+
+//===---------------------------------------------------------------------===//
+
+It's not clear whether we should use pxor or xorps / xorpd to clear XMM
+registers. The choice may depend on subtarget information. We should do some
+more experiments on different x86 machines.