4 Commits

Author	SHA1	Message	Date
Simon Pilgrim	ccdd1ff49b	[X86][SSE] Enable commutation from MOVSD/MOVSS to BLENDPD/BLENDPS on SSE41+ targets ... Instead of selecting between MOVSD/MOVSS and BLENDPD/BLENDPS at shuffle lowering by subtarget this will help us select the instruction based on actual commutation requirements. We could possibly add BLENDPD/BLENDPS -> MOVSD/MOVSS commutation and MOVSD/MOVSS memory folding using a similar approach if it proves useful I avoided adding AVX512 handling as I'm not sure when we should be making use of VBLENDPD/VBLENDPS on EVEX targets llvm-svn: 283037	2016-10-01 14:26:11 +00:00
Simon Pilgrim	3c8cd3df5e	[X86][F16C] Regenerated f16c tests ... llvm-svn: 279621	2016-08-24 11:56:15 +00:00
Matthias Braun	152e7c8b12	VirtRegMap: Replace some identity copies with KILL instructions. ... An identity COPY like this: %AL = COPY %AL, %EAX<imp-def> has no semantic effect, but encodes liveness information: Further users of %EAX only depend on this instruction even though it does not define the full register. Replace the COPY with a KILL instruction in those cases to maintain this liveness information. (This reverts a small part of r238588 but this time adds a comment explaining why a KILL instruction is useful). llvm-svn: 274952	2016-07-09 00:19:07 +00:00
Simon Pilgrim	ab3809193c	[X86][F16C] Added F16C fast-isel tests to match clang/test/CodeGen/f16c-builtins.c ... llvm-svn: 270837	2016-05-26 10:26:56 +00:00