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| author | Evan Cheng <evan.cheng@apple.com> | 2007-07-20 00:27:43 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2007-07-20 00:27:43 +0000 |
| commit | 51a49b275b7bcd492ba92f90a9a9e46ed36bef9f (patch) | |
| tree | 624c7905eccde5aff24a64cd8a463cf49c52ad50 /runtime | |
| parent | fc61b59cece3f3dcea0076ffd25f69b3adb4f0ec (diff) | |
| download | external_llvm-51a49b275b7bcd492ba92f90a9a9e46ed36bef9f.zip external_llvm-51a49b275b7bcd492ba92f90a9a9e46ed36bef9f.tar.gz external_llvm-51a49b275b7bcd492ba92f90a9a9e46ed36bef9f.tar.bz2 | |
Because we promote SSE logical ops and loads to v2i64, we often end up generate
code that cross integer / floating point domains (e.g. generate pxor / pand for
logical ops on floating point value, movdqa to load / store floating point SSE
values). Given that, it's better to use movaps instead of movdqa and movups
instead of movdqu. They have the same latency but the "aps" variants are one
byte shorter.
If the domain crossing problem is a real performance issue, then we will have to
fix it with dynamic programming based isel.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40076 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'runtime')
0 files changed, 0 insertions, 0 deletions