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[x86] Recognize that we can use duplication to widen v16i8 shuffles due
authorChandler Carruth <chandlerc@gmail.com>
Fri, 19 Sep 2014 09:45:21 +0000 (09:45 +0000)
committerChandler Carruth <chandlerc@gmail.com>
Fri, 19 Sep 2014 09:45:21 +0000 (09:45 +0000)
commit89436b4160f6a7d203fceec94db8cdca9b4290d3
tree111a2bee7915e1efbea585fbccbf4dd8db92a9c2tree | snapshot
parent3e990c1e5b44d2b2ffbe0ad31d5d2b1bf70f8cb8commit | diff
[x86] Recognize that we can use duplication to widen v16i8 shuffles due
to undef lanes as well as defined widenable lanes. This dramatically
improves the lowering we use for undef-shuffles in a zext-ish pattern
for SSE2.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218115 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Target/X86/X86ISelLowering.cpp diff | blob | history
test/CodeGen/X86/vector-shuffle-128-v16.ll diff | blob | history
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