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unpck
2010 Aug 04
2
[LLVMdev] x86 Vector Shuffle Patterns
...mbines all three into the SHUFPS instruction,
appropriately transforming the mask with SHUFFLE_get_shuf_imm?
All of the shufp stuff looks very much like the vperm2f128 stuff but yet
shufp works and vperm2f128 doesn't.
Some vector_shuffle fragments seem to "ignore" the mask:
def UNPCKHPSrr : PSI<0x15, MRMSrcReg,
(outs VR128:$dst), (ins VR128:$src1, VR128:$src2),
"unpckhps\t{$src2, $dst|$dst, $src2}",
[(set VR128:$dst,
(v4f32 (unpckh VR128:$src1, VR128:$src2)))]>;...