[X86][SSE] combineBitcastvxi1 - use PACKSSWB directly to pack v8i16 to v16i8
authorSimon Pilgrim <llvm-dev@redking.me.uk>
Mon, 23 Oct 2017 22:05:02 +0000 (22:05 +0000)
committerSimon Pilgrim <llvm-dev@redking.me.uk>
Mon, 23 Oct 2017 22:05:02 +0000 (22:05 +0000)
commit321e54f72d40aecd51f5db9e6d26c8db307e49a8
tree28adf592aa6c7ef4a072f290f7887d9e00ad187d
parent6f1c26f222b5df888a42ac53f1b600f2bd511c1b
[X86][SSE] combineBitcastvxi1 - use PACKSSWB directly to pack v8i16 to v16i8

Avoid difficulties determining the number of sign bits later on in shuffle lowering to lower to PACKSS

llvm-svn: 316383
llvm/lib/Target/X86/X86ISelLowering.cpp
llvm/test/CodeGen/X86/bitcast-and-setcc-128.ll
llvm/test/CodeGen/X86/bitcast-and-setcc-256.ll
llvm/test/CodeGen/X86/bitcast-setcc-256.ll
llvm/test/CodeGen/X86/bitcast-setcc-512.ll