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Sanjay Patel fe76881930 [X86, AVX] recognize shufflevector with zero input as a vperm2 (PR22984)
vperm2x128 instructions have the special ability (aka free hardware capability)
to shuffle zero values into a vector.

This patch recognizes that type of shuffle and generates the appropriate
control byte.

https://llvm.org/bugs/show_bug.cgi?id=22984

Differential Revision: http://reviews.llvm.org/D8563



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233100 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-24 19:19:07 +00:00
autoconf [autoconf] Fix the build failure by quoting the strings. 2015-03-12 19:56:25 +00:00
bindings
cmake Re-land: Generate targets for each lit suite. 2015-03-23 20:04:00 +00:00
docs docs: Update llvm-cov docs for the -use-color flag 2015-03-19 18:22:46 +00:00
examples CMake: Disable ENABLE_EXPORTS for executables with MSVC 2015-03-18 20:09:13 +00:00
include DebugInfo: Reorder definitions of MDLocation and MDFile, NFC 2015-03-24 17:34:33 +00:00
lib [X86, AVX] recognize shufflevector with zero input as a vperm2 (PR22984) 2015-03-24 19:19:07 +00:00
projects
test [X86, AVX] recognize shufflevector with zero input as a vperm2 (PR22984) 2015-03-24 19:19:07 +00:00
tools Cleanup else-after-return and add an early-return to llvm-nm 2015-03-23 21:17:43 +00:00
unittests Purge unused includes throughout libSupport. 2015-03-23 18:07:13 +00:00
utils Revert "Use std::bitset for SubtargetFeatures" 2015-03-24 12:56:59 +00:00
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CMakeLists.txt Re-land: Generate targets for each lit suite. 2015-03-23 20:04:00 +00:00
CODE_OWNERS.TXT Tom is also responsible for the 3.6 branch. 2015-03-16 18:15:27 +00:00
configure [autoconf] Fix the build failure by quoting the strings. 2015-03-12 19:56:25 +00:00
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