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Ahmed Bougacha 66649e00c9 [CodeGen] Combine concat_vector of trunc'd scalar to scalar_to_vector. 
We already do:
  concat_vectors(scalar, undef) -> scalar_to_vector(scalar)
When the scalar is legal.
When it's not, but is a truncated legal scalar, we can also do:
  concat_vectors(trunc(scalar), undef) -> scalar_to_vector(scalar)
Which is equivalent, since the upper lanes are undef anyway.
While there, teach the combine to look at more than 2 operands.

Differential Revision: http://reviews.llvm.org/D8883


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234530 91177308-0d34-0410-b5e6-96231b3b80d8
2015-04-09 20:04:47 +00:00
autoconf
bindings Go bindings: make various DIBuilder arguments optional. 2015-04-08 20:18:57 +00:00
cmake Disable all link optimizations in a debug build. 2015-04-06 15:04:31 +00:00
docs [lib/Fuzzer] show how to find Heartbleed with LibFuzzer 2015-04-08 06:16:11 +00:00
examples llvm/examples/BrainF: Give an explicit pointee type to ConstantExpr::getGetElementPtr(ty...), according to r233938. 2015-04-02 22:44:00 +00:00
include [NFC] add more comments for SLSR 2015-04-09 17:04:28 +00:00
lib [CodeGen] Combine concat_vector of trunc'd scalar to scalar_to_vector. 2015-04-09 20:04:47 +00:00
projects
test [CodeGen] Combine concat_vector of trunc'd scalar to scalar_to_vector. 2015-04-09 20:04:47 +00:00
tools This reverts commit r234460 and r234461. 2015-04-09 15:54:59 +00:00
unittests IR: Remove MDTupleTypedArrayWrapper::operator MDTuple*() 2015-04-07 16:50:39 +00:00
utils Use SmallVector instead of std::vector for uniquing X86 disassembler operand sets. The number of operands is a small fixed size. 2015-04-09 04:08:48 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt Enable W4 warnings by default for MSVC builds 2015-04-07 19:01:01 +00:00
CODE_OWNERS.TXT Tom is also responsible for the 3.6 branch. 2015-03-16 18:15:27 +00:00
configure
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile
Makefile.common
Makefile.config.in
Makefile.rules
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +00:00

README.txt 

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