Andrea Di Biagio 3996e5290a [DAG] Further improve the logic in DAGCombiner that folds a pair of shuffles into a single shuffle if the resulting mask is legal. ... This patch teaches the DAGCombiner how to fold shuffles according to the following new rules: 1. shuffle(shuffle(x, y), undef) -> x 2. shuffle(shuffle(x, y), undef) -> y 3. shuffle(shuffle(x, y), undef) -> shuffle(x, undef) 4. shuffle(shuffle(x, y), undef) -> shuffle(y, undef) The backend avoids to combine shuffles according to rules 3. and 4. if the resulting shuffle does not have a legal mask. This is to avoid introducing illegal shuffles that are potentially expanded into a sub-optimal sequence of target specific dag nodes during vector legalization. Added test case combine-vec-shuffle-2.ll to verify that we correctly triggers the new rules when combining shuffles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212748 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-10 18:04:55 +00:00
..
Analysis	Improve BasicAA CS-CS queries	2014-07-08 23:16:49 +00:00
Assembler	IR: Add COMDATs to the IR	2014-06-27 18:19:56 +00:00
Bindings	Reduce verbiage of lit.local.cfg files	2014-06-09 22:42:55 +00:00
Bitcode	Add some test files for r211710.	2014-06-25 15:41:39 +00:00
BugPoint	Revert r206989, "Mark llvm/test/BugPoint/compile-custom.ll as XFAIL:vg_leak." It has been fixed since r207265.	2014-04-27 11:59:33 +00:00
CodeGen	[DAG] Further improve the logic in DAGCombiner that folds a pair of shuffles into a single shuffle if the resulting mask is legal.	2014-07-10 18:04:55 +00:00
DebugInfo	[SystemZ] Fix FPR dwarf numbering	2014-07-10 10:45:11 +00:00
ExecutionEngine	Fix this test to not write to the source tree, and instead to write to	2014-06-28 05:18:49 +00:00
Feature	IR: Aliases don't belong to an explicit comdat	2014-07-10 16:26:10 +00:00
FileCheck
Instrumentation	[dfsan] Handle bitcast aliases.	2014-07-10 01:30:39 +00:00
Integer
JitListener
Linker	IR: Add COMDATs to the IR	2014-06-27 18:19:56 +00:00
LTO	Change the default input for llvm-nm to be a.out instead of standard input	2014-06-23 20:27:53 +00:00
MC	[AArch64] Add logical alias instructions to MC AsmParser	2014-07-10 15:12:26 +00:00
Object	Changed the lvm-nm alias "-s" for -print-armap to "-M".	2014-07-08 23:47:31 +00:00
Other	IR: Fold away compares between GV GEPs and GVs	2014-07-04 22:05:26 +00:00
TableGen	Fix error in tablegen when either operand of !if is an empty list.	2014-06-10 20:10:08 +00:00
tools	[llvm-readobj] Fix output of MIPS GOT without local and global entries.	2014-07-05 19:28:49 +00:00
Transforms	InstCombine: Fix a crash in Descale for multiply-by-zero	2014-07-10 17:13:27 +00:00
Unit	Let test/Unit/lit.cfg add config.shlibdir to $PATH on DLL platforms like cygming.	2014-07-04 05:11:55 +00:00
Verifier	IR: Add COMDATs to the IR	2014-06-27 18:19:56 +00:00
YAMLParser
.clang-format
CMakeLists.txt	OK, NAKAMURA Takumi beat me to this change. So backing out my addition of	2014-05-19 23:26:51 +00:00
lit.cfg	Delete utils/FileUpdate.	2014-06-23 17:58:39 +00:00
lit.site.cfg.in
Makefile	lld test for configure & make	2014-06-06 09:06:25 +00:00
Makefile.tests
TestRunner.sh