Hal Finkel d48111840e Revert "r226086 - Revert "r226071 - [RegisterCoalescer] Remove copies to reserved registers"" ... Reapply r226071 with fixes. Two fixes: 1. We need to manually remove the old and create the new 'deaf defs' associated with physical register definitions when we move the definition of the physical register from the copy point to the point of the original vreg def. This problem was picked up by the machinstr verifier, and could trigger a verification failure on test/CodeGen/X86/2009-02-12-DebugInfoVLA.ll, so I've turned on the verifier in the tests. 2. When moving the def point of the phys reg up, we need to make sure that it is neither defined nor read in between the two instructions. We don't, however, extend the live ranges of phys reg defs to cover uses, so just checking for live-range overlap between the pair interval and the phys reg aliases won't pick up reads. As a result, we manually iterate over the range and check for reads. A test soon to be committed to the PowerPC backend will test this change. Original commit message: [RegisterCoalescer] Remove copies to reserved registers This allows the RegisterCoalescer to join "non-flipped" range pairs with a physical destination register -- which allows the RegisterCoalescer to remove copies like this: <vreg> = something (maybe a load, for example) ... (things that don't use PHYSREG) PHYSREG = COPY <vreg> (with all of the restrictions normally applied by the RegisterCoalescer: having compatible register classes, etc. ) Previously, the RegisterCoalescer handled only the opposite case (copying *from* a physical register). I don't handle the problem fully here, but try to get the common case where there is only one use of <vreg> (the COPY). An upcoming commit to the PowerPC backend will make this pattern much more common on PPC64/ELF systems. llvm-svn: 226200		2015-01-15 20:32:09 +00:00
..
Analysis	[PM] Port domtree to the new pass manager (at last).	2015-01-14 10:19:28 +00:00
Assembler	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
Bindings	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
Bitcode	Revert Don't create new comdats in CodeGen	2015-01-15 16:14:34 +00:00
BugPoint	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
CodeGen	Revert "r226086 - Revert "r226071 - [RegisterCoalescer] Remove copies to reserved registers""	2015-01-15 20:32:09 +00:00
DebugInfo	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
ExecutionEngine	[MCJIT] Remove a few redundant MCJIT tests, and drop the extraneous datalayout	2015-01-08 18:52:15 +00:00
Feature	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
FileCheck
Instrumentation	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
Integer
JitListener	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
Linker	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
LTO	Put this test's input in the Inputs directory where it belongs, rather than	2015-01-12 08:50:47 +00:00
MC	[Hexagon] Removing old versions of vsplice, valign, cl0, ct0 and updating references to new versions.	2015-01-15 19:28:32 +00:00
Object	Don't loop endlessly for MachO files with 0 ncmds	2015-01-06 17:08:26 +00:00
Other	[PM] Port TargetLibraryInfo to the new pass manager, provided by the	2015-01-15 11:39:46 +00:00
SymbolRewriter
TableGen
tools	Fix linking of shared libraries.	2015-01-14 20:08:46 +00:00
Transforms	Fix PR22222	2015-01-15 01:46:09 +00:00
Unit
Verifier	Rename llvm.recoverframeallocation to llvm.framerecover	2015-01-13 01:51:34 +00:00
YAMLParser
.clang-format
CMakeLists.txt	Revert r224149, llvm-dsymutil was already here.	2014-12-12 21:25:07 +00:00
lit.cfg	llvm/test/lit.cfg: have_ld_plugin_support(): Use decode() for stdout.	2015-01-05 14:18:04 +00:00
lit.site.cfg.in	[lit] Make config.llvm_lib_dir available on cmake, too.	2014-12-30 03:24:11 +00:00
Makefile	[lit] Make config.llvm_lib_dir available on cmake, too.	2014-12-30 03:24:11 +00:00
Makefile.tests
TestRunner.sh