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llvm-svn: 27643
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Evan Cheng 2006-04-13 05:09:45 +00:00
parent d5bd292d89
commit d6cad69ef4
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lib/Target/X86/README.txt
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@ -191,6 +191,18 @@ commutative, it is not matched with the load on both sides. The dag combiner
should be made smart enough to cannonicalize the load into the RHS of a compare
when it can invert the result of the compare for free.
How about intrinsics? An example is:
*res = _mm_mulhi_epu16(*A, _mm_mul_epu32(*B, *C));
compiles to
pmuludq (%eax), %xmm0
movl 8(%esp), %eax
movdqa (%eax), %xmm1
pmulhuw %xmm0, %xmm1
The transformation probably requires a X86 specific pass or a DAG combiner
target specific hook.
//===---------------------------------------------------------------------===//
LSR should be turned on for the X86 backend and tuned to take advantage of its