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llvm-svn: 28176
This commit is contained in:
Chris Lattner 2006-05-08 21:24:21 +00:00
parent 446e1ef26a
commit 5bcea612f4
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9
llvm/lib/Target/X86/README.txt
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@ -1166,4 +1166,13 @@ pressure. The scheduling issue is more pronounced without -static.
The 2) marked instructions are the lowered form of the 1,undef,3,4 The 2) marked instructions are the lowered form of the 1,undef,3,4
shufflevector. It seems that there should be a better way to do it :) shufflevector. It seems that there should be a better way to do it :)
//===---------------------------------------------------------------------===//
If shorter, we should use things like:
movzwl %ax, %eax
instead of:
andl $65535, %EAX
The former can also be used when the two-addressy nature of the 'and' would
require a copy to be inserted (in X86InstrInfo::convertToThreeAddress).