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.
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