Quentin Colombet c364314ec3 [MachineCopyPropagation] Handle undef flags conservatively so that we do not ... remove copies that are useful after breaking some hardware dependencies. In other words, handle this kind of situations conservatively by assuming reg2 is redefined by the undef flag. reg1 = copy reg2 = inst reg2<undef> reg2 = copy reg1 Copy propagation used to remove the last copy. This is incorrect because the undef flag on reg2 in inst, allows next passes to put whatever trashed value in reg2 that may help. In practice we end up with this code: reg1 = copy reg2 reg2 = 0 = inst reg2<undef> reg2 = copy reg1 This fixes PR21743. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235647 91177308-0d34-0410-b5e6-96231b3b80d8		2015-04-23 21:17:39 +00:00
..
Analysis	[getUnderlyingOjbects] Analyze loop PHIs further to remove false positives	2015-04-23 20:09:20 +00:00
Assembler
Bindings
Bitcode	Be more strict about the operand for the array type in BitcodeReader	2015-04-23 13:38:21 +00:00
BugPoint	bugpoint Enhancement.	2015-04-20 23:42:22 +00:00
CodeGen	[MachineCopyPropagation] Handle undef flags conservatively so that we do not	2015-04-23 21:17:39 +00:00
DebugInfo	Unxfail passing test on Hexagon	2015-04-22 21:41:24 +00:00
ExecutionEngine
Feature
FileCheck
Instrumentation
Integer
JitListener
Linker	Linker: Add flag to override linkage rules	2015-04-22 04:11:00 +00:00
LTO
MC	ARM: When spilling extra registers for alignment, prefer low registers on all Thumb targets.	2015-04-23 20:31:26 +00:00
Object	Support arm32 R_ARM_V4BX relocation format	2015-04-22 15:26:43 +00:00
Other
SymbolRewriter
TableGen	Add support for v1i128 type.	2015-04-17 16:11:05 +00:00
tools	[Mips] Support DT_MIPS_OPTIONS dynamic section tag in the llvm-readobj	2015-04-20 05:34:48 +00:00
Transforms	[NVPTX] run SeparateConstOffsetFromGEP before SLSR	2015-04-23 20:00:04 +00:00
Unit
Verifier
YAMLParser
.clang-format
CMakeLists.txt
lit.cfg
lit.site.cfg.in
Makefile
Makefile.tests
TestRunner.sh