Changes in directory llvm/lib/Target/X86:
README.txt updated: 1.101 -> 1.102 --- Log message: add a note --- Diffs of the changes: (+9 -0) README.txt | 9 +++++++++ 1 files changed, 9 insertions(+) Index: llvm/lib/Target/X86/README.txt diff -u llvm/lib/Target/X86/README.txt:1.101 llvm/lib/Target/X86/README.txt:1.102 --- llvm/lib/Target/X86/README.txt:1.101 Tue May 2 17:43:31 2006 +++ llvm/lib/Target/X86/README.txt Mon May 8 16:24:21 2006 @@ -1166,4 +1166,13 @@ 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). _______________________________________________ llvm-commits mailing list llvm-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
