RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-10-20 19:42:54 +02:00
Code Issues Projects Releases Wiki Activity

Remind ourselves to revisit the "pxor vs. xorps/xorpd to clear XMM registers"

Browse Source 
issue. Need to do more experiments.

llvm-svn: 26247
This commit is contained in:
Evan Cheng 2006-02-17 00:04:28 +00:00
parent b0ec087c0f
commit c7b32ddecc
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/Target/X86/README.txt
View File

@ -437,3 +437,9 @@ It might be better to generate
movw al, 8(%edx)
when we can spare a register. It reduces code size.
//===---------------------------------------------------------------------===//
It's not clear whether we should use pxor or xorps / xorpd to clear XMM
registers. The choice may depend on subtarget information. We should do some
more experiments on different x86 machines.