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| author | Evan Cheng <evan.cheng@apple.com> | 2009-01-28 08:35:02 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-01-28 08:35:02 +0000 |
| commit | 2f3f5b57940b253bf735a20f9b6864d4cfbfb9b4 (patch) | |
| tree | c0fef539fd12b677df7b6e0f5cdb16e6b411ce4a /lib/Target/X86/README-SSE.txt | |
| parent | 576beb25eed0c534918a9bacb5a936b955003bae (diff) | |
| download | external_llvm-2f3f5b57940b253bf735a20f9b6864d4cfbfb9b4.zip external_llvm-2f3f5b57940b253bf735a20f9b6864d4cfbfb9b4.tar.gz external_llvm-2f3f5b57940b253bf735a20f9b6864d4cfbfb9b4.tar.bz2 | |
The memory alignment requirement on some of the mov{h|l}p{d|s} patterns are 16-byte. That is overly strict. These instructions read / write f64 memory locations without alignment requirement.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63195 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/README-SSE.txt')
| -rw-r--r-- | lib/Target/X86/README-SSE.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt index 7110b31..bc51b53 100644 --- a/lib/Target/X86/README-SSE.txt +++ b/lib/Target/X86/README-SSE.txt @@ -907,3 +907,8 @@ We should be able to use: cvtsi2ss 8($esp), %xmm0 since we know the stack slot is already zext'd. +//===---------------------------------------------------------------------===// + +Consider using movlps instead of movsd to implement (scalar_to_vector (loadf64)) +when code size is critical. movlps is slower than movsd on core2 but it's one +byte shorter. |