Arnold Schwaighofer 8228ffe72d SimplifyCFG: If convert single conditional stores ... This resurrects r179957, but adds code that makes sure we don't touch atomic/volatile stores: This transformation will transform a conditional store with a preceeding uncondtional store to the same location: a[i] = may-alias with a[i] load if (cond) a[i] = Y into an unconditional store. a[i] = X may-alias with a[i] load tmp = cond ? Y : X; a[i] = tmp We assume that on average the cost of a mispredicted branch is going to be higher than the cost of a second store to the same location, and that the secondary benefits of creating a bigger basic block for other optimizations to work on outway the potential case where the branch would be correctly predicted and the cost of the executing the second store would be noticably reflected in performance. hmmer's execution time improves by 30% on an imac12,2 on ref data sets. With this change we are on par with gcc's performance (gcc also performs this transformation). There was a 1.2 % performance improvement on a ARM swift chip. Other tests in the test-suite+external seem to be mostly uninfluenced in my experiments: This optimization was triggered on 41 tests such that the executable was different before/after the patch. Only 1 out of the 40 tests (dealII) was reproducable below 100% (by about .4%). Given that hmmer benefits so much I believe this to be a fair trade off. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180731 91177308-0d34-0410-b5e6-96231b3b80d8		2013-04-29 21:28:24 +00:00
..
Analysis	Struct-path aware TBAA: change the format of TBAAStructType node.	2013-04-27 00:26:11 +00:00
Archive
Assembler	Correct invalid debug info metadata	2013-03-12 19:04:24 +00:00
Bindings/Ocaml	Use the attribute group reference instead of the attribute directly.	2013-02-20 07:48:23 +00:00
Bitcode	Unify clang/llvm attributes for asan/tsan/msan (LLVM part)	2013-02-26 06:58:09 +00:00
BugPoint
CodeGen	Make all darwin ppc stubs local.	2013-04-27 00:43:16 +00:00
DebugInfo	AArch64: convert MC-layer test to .s file	2013-04-27 11:56:14 +00:00
ExecutionEngine	Disable the MCJIT tests on 32 bit darwin.	2013-04-29 21:09:32 +00:00
Feature	Clarify that llvm.used can contain aliases.	2013-04-22 14:58:02 +00:00
FileCheck	Remove SMLoc paired with CHECK-NOT patterns. Not functionality change.	2013-04-25 21:31:34 +00:00
Instrumentation	Add missing colons to check lines.	2013-04-11 12:41:41 +00:00
Integer	Rewrite test/Integer tests to use FileCheck instead of grep	2013-04-08 20:18:15 +00:00
JitListener	Add support for source and line information to IntelJITEventListener for object emitted by MCJIT.	2013-01-28 19:52:37 +00:00
Linker	Rewrite test/Linker tests to use FileCheck instead of grep.	2013-04-09 16:51:13 +00:00
MC	ARM: Fix encoding of hint instruction for Thumb.	2013-04-26 17:54:54 +00:00
Object	Add missing ':'.	2013-04-26 17:54:46 +00:00
Other	Attributes: Don't print trailing whitespace on the function attribute comment.	2013-04-19 11:43:21 +00:00
TableGen	Allow TableGen DAG arguments to be just a name.	2013-03-24 19:36:51 +00:00
tools	Use pointers to iterate over symbols.	2013-04-24 19:47:55 +00:00
Transforms	SimplifyCFG: If convert single conditional stores	2013-04-29 21:28:24 +00:00
Unit	Propagate path to ASan/MSan symbolizer into test environment to produce useful reports on errors.	2013-04-04 07:41:00 +00:00
Verifier	Also verify llvm.compiler_used.	2013-04-22 15:16:51 +00:00
YAMLParser
CMakeLists.txt	Add obj2yaml to test dependencies	2013-04-05 07:26:37 +00:00
lit.cfg	Use zlib to uncompress debug sections in DWARF parser.	2013-04-23 10:17:34 +00:00
lit.site.cfg.in	Use zlib to uncompress debug sections in DWARF parser.	2013-04-23 10:17:34 +00:00
Makefile	Use zlib to uncompress debug sections in DWARF parser.	2013-04-23 10:17:34 +00:00
Makefile.tests	Remove obsolete object file dumpers	2013-04-12 04:07:13 +00:00
TestRunner.sh