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| author | Chris Lattner <sabre@nondot.org> | 2006-05-08 21:24:21 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-05-08 21:24:21 +0000 |
| commit | 5bcea612f4b6ed60aa2bc1c1c632dcb4c5b508b4 (patch) | |
| tree | 427180bb4a26cfce8c5d0e9e01fdc9a39af78490 /llvm/lib/Target | |
| parent | 446e1ef26a4a1c842fe40eb9bc15b8c882062418 (diff) | |
| download | bcm5719-llvm-5bcea612f4b6ed60aa2bc1c1c632dcb4c5b508b4.tar.gz bcm5719-llvm-5bcea612f4b6ed60aa2bc1c1c632dcb4c5b508b4.zip | |
add a note
llvm-svn: 28176
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/README.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/README.txt b/llvm/lib/Target/X86/README.txt index b8ec59ae364..af520afe1d8 100644 --- a/llvm/lib/Target/X86/README.txt +++ b/llvm/lib/Target/X86/README.txt @@ -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). |
