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Revert rL356864 : [X86][SSE41] Start shuffle combining from…

Authored by RKSimon on Mar 27 2019, 3:25 AM.

Description

Revert rL356864 : [X86][SSE41] Start shuffle combining from ZERO_EXTEND_VECTOR_INREG (PR40685)

Enable SSE41 ZERO_EXTEND_VECTOR_INREG shuffle combines - for the PMOVZX(PSHUFD(V)) -> UNPCKH(V,0) pattern we reduce the shuffles (port5-bottleneck on Intel) at the expense of creating a zero (pxor v,v) and an extra register move - which is a good trade off as these are pretty cheap and in most cases it doesn't increase register pressure.

This also exposed a missed opportunity to use combine to ZERO_EXTEND_VECTOR_INREG with folded loads - even if we're in the float domain.
........
Causes PR41249

llvm-svn: 357057

Details

Committed
RKSimonMar 27 2019, 3:25 AM
Parents
rGab0f18076b11: Fix a "memset clearing an object of non-trivial type" warning in DWARFFormValue
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