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| author | Evan Cheng <evan.cheng@apple.com> | 2008-11-11 17:35:52 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-11-11 17:35:52 +0000 |
| commit | 2d1937ede5906b9df442f2eab3f2238ded2b99ff (patch) | |
| tree | 82b5227b9b45a1a1bcf746f9367449cb017ab933 /llvm/lib | |
| parent | 93bf988701ff465119aac091eaa2b10dbf4274a5 (diff) | |
| download | bcm5719-llvm-2d1937ede5906b9df442f2eab3f2238ded2b99ff.tar.gz bcm5719-llvm-2d1937ede5906b9df442f2eab3f2238ded2b99ff.zip | |
Add a README entry.
llvm-svn: 59052
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/README.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/README.txt b/llvm/lib/Target/X86/README.txt index 53c002b2822..92747623451 100644 --- a/llvm/lib/Target/X86/README.txt +++ b/llvm/lib/Target/X86/README.txt @@ -1773,3 +1773,20 @@ gcc 4.3 generates: movl 12(%ebp), %eax popl %ebp ret + +//===---------------------------------------------------------------------===// + +Teach tblgen not to check bitconvert source type in some cases. This allows us +to consolidate the following patterns in X86InstrMMX.td: + +def : Pat<(v2i32 (bitconvert (i64 (vector_extract (v2i64 VR128:$src), + (iPTR 0))))), + (v2i32 (MMX_MOVDQ2Qrr VR128:$src))>; +def : Pat<(v4i16 (bitconvert (i64 (vector_extract (v2i64 VR128:$src), + (iPTR 0))))), + (v4i16 (MMX_MOVDQ2Qrr VR128:$src))>; +def : Pat<(v8i8 (bitconvert (i64 (vector_extract (v2i64 VR128:$src), + (iPTR 0))))), + (v8i8 (MMX_MOVDQ2Qrr VR128:$src))>; + +There are other cases in various td files. |
