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Add a README entry. 

llvm-svn: 59052
This commit is contained in:
Evan Cheng 2008-11-11 17:35:52 +00:00
parent 93bf988701
commit 2d1937ede5
1 changed files with 17 additions and 0 deletions
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17
llvm/lib/Target/X86/README.txt
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@ -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.