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Remind ourselves to revisit the "pxor vs. xorps/xorpd to clear XMM registers"

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issue. Need to do more experiments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26247 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2006-02-17 00:04:28 +00:00
parent 4c5dcf54ff
commit 7634ac4a9b
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6
lib/Target/X86/README.txt
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@ -437,3 +437,9 @@ It might be better to generate
movw al, 8(%edx) movw al, 8(%edx)
when we can spare a register. It reduces code size. 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.