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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28176 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2006-05-08 21:24:21 +00:00
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commit 8ef67ac3c3
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9
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
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).