diff options
| 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 | 8ef67ac3c3d3b21d4d5e9b7275603a6366acef9a (patch) | |
| tree | 4aa4df73570c62adb0ae37aef7c71a06439b51fe /lib | |
| parent | 4b37e87ab9e7bfad8b87115278ca589f8d49ba26 (diff) | |
add a note
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28176 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/README.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index b8ec59ae36..af520afe1d 100644 --- a/lib/Target/X86/README.txt +++ b/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). |