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llvm/test/DebugInfo
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Dehao Chen 0872bb248f Using branch probability to guide critical edge splitting. 
Summary:
The original heuristic to break critical edge during machine sink is relatively conservertive: when there is only one instruction sinkable to the critical edge, it is likely that the machine sink pass will not break the critical edge. This leads to many speculative instructions executed at runtime. However, with profile info, we could model the splitting benefits: if the critical edge has 50% taken rate, it would always be beneficial to split the critical edge to avoid the speculated runtime instructions. This patch uses profile to guide critical edge splitting in machine sink pass.

The performance impact on speccpu2006 on Intel sandybridge machines:

spec/2006/fp/C++/444.namd                  25.3  +0.26%
spec/2006/fp/C++/447.dealII               45.96  -0.10%
spec/2006/fp/C++/450.soplex               41.97  +1.49%
spec/2006/fp/C++/453.povray               36.83  -0.96%
spec/2006/fp/C/433.milc                   23.81  +0.32%
spec/2006/fp/C/470.lbm                    41.17  +0.34%
spec/2006/fp/C/482.sphinx3                48.13  +0.69%
spec/2006/int/C++/471.omnetpp             22.45  +3.25%
spec/2006/int/C++/473.astar               21.35  -2.06%
spec/2006/int/C++/483.xalancbmk           36.02  -2.39%
spec/2006/int/C/400.perlbench              33.7  -0.17%
spec/2006/int/C/401.bzip2                  22.9  +0.52%
spec/2006/int/C/403.gcc                   32.42  -0.54%
spec/2006/int/C/429.mcf                   39.59  +0.19%
spec/2006/int/C/445.gobmk                 26.98  -0.00%
spec/2006/int/C/456.hmmer                 24.52  -0.18%
spec/2006/int/C/458.sjeng                 28.26  +0.02%
spec/2006/int/C/462.libquantum            55.44  +3.74%
spec/2006/int/C/464.h264ref               46.67  -0.39%

geometric mean                                   +0.20%

Manually checked 473 and 471 to verify the diff is in the noise range.

Reviewers: rengolin, davidxl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D24818

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284757 91177308-0d34-0410-b5e6-96231b3b80d8
2016-10-20 18:06:52 +00:00
..
AArch64 DebugInfo: preparation to implement DW_AT_alignment 2016-10-20 00:13:12 +00:00
ARM DebugInfo: preparation to implement DW_AT_alignment 2016-10-20 00:13:12 +00:00
COFF Using branch probability to guide critical edge splitting. 2016-10-20 18:06:52 +00:00
Generic Preserve the debug location when CodeGenPrepare sinks a compare instruction into the 2016-10-06 21:43:45 +00:00
Inputs Revert r282238 "Revert r282235 "[llvm-dwarfdump] - Teach dwarfdump to dump gdb-index section."" 2016-09-23 11:01:53 +00:00
Lanai [lanai] Add Lanai backend. 2016-03-28 13:09:54 +00:00
Mips [mips][FastISel] Instantiate the MipsFastISel class only for targets that support FastISel. 2016-10-18 13:05:42 +00:00
MIR Teach LiveDebugValues about lexical scopes. 2016-09-28 17:51:14 +00:00
PDB [pdb] Dump Module Symbols to Yaml. 2016-10-08 01:12:01 +00:00
PowerPC DebugInfo: New metadata representation for global variables. 2016-09-13 01:12:59 +00:00
Sparc [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
SystemZ [SystemZ] Save/restore r6 and r7 if function contains landing pad. 2016-06-28 14:13:11 +00:00
WebAssembly [WebAssembly] Trying to fix broken tests in CodeGen/WebAssembly caused by r281285. 2016-09-13 10:05:44 +00:00
X86 DebugInfo: preparation to implement DW_AT_alignment 2016-10-20 00:13:12 +00:00
arm-relocs.test
debuglineinfo-macho.test [DWARF] Fix a bug in line info handling 2015-05-31 23:37:04 +00:00
debuglineinfo.test [DWARF] Fix a bug in line info handling 2015-05-31 23:37:04 +00:00
debugmacinfo.test Fix several accidental DOS line endings in source files 2016-01-03 17:22:03 +00:00
dwarfdump-64-bit-dwarf.test DebugInfo: .debug_line DWARF64 support 2015-05-28 15:38:17 +00:00
dwarfdump-accel.test Synchronize LLVM and clang's ObjCDeclSpec::ObjCPropertyAttributeKind. 2016-07-14 00:41:18 +00:00
dwarfdump-debug-frame-simple.test [dwarfdump] Make debug_frame dump actually useful. 2015-02-25 21:30:22 +00:00
dwarfdump-debug-loc-simple.test
dwarfdump-dump-flags.test [dwarfdump] Ignore scattered relocations for mach-o. 2015-07-31 20:22:50 +00:00
dwarfdump-dump-gdbindex.test Revert r282238 "Revert r282235 "[llvm-dwarfdump] - Teach dwarfdump to dump gdb-index section."" 2016-09-23 11:01:53 +00:00
dwarfdump-dwp.test dwarfdump: Correctly indentify the indicies for DWP records 2015-12-03 18:41:59 +00:00
dwarfdump-invalid.test Make llvm-dwarfdump exit with non-zero exit code if error was occured. 2015-06-25 23:40:15 +00:00
dwarfdump-line-dwo.test
dwarfdump-macho-relocs.test [dwarfdump] Do not apply relocations in mach-o files if there is no LoadedObjectInfo. 2015-08-23 04:44:21 +00:00
dwarfdump-macho-universal.test Don't use test inputs from other directories. 2015-08-03 11:59:45 +00:00
dwarfdump-objc.test Synchronize LLVM and clang's ObjCDeclSpec::ObjCPropertyAttributeKind. 2016-07-14 00:41:18 +00:00
dwarfdump-pubnames.test
dwarfdump-ranges.test [dwarfdump] Dump DW_AT_ranges values inline in the debug_info dump. 2014-10-23 04:08:34 +00:00
dwarfdump-type-units.test dwarfdump: -summarize-types: print a short summary (unqualified type name, hash, length) of type units rather than dumping contents 2016-10-18 21:09:48 +00:00
dwarfdump-zlib.test Recommit r270547 ([llvm-dwarfdump] - Teach dwarfdump to decompress debug sections in zlib style.) 2016-05-24 12:48:46 +00:00
dwo.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
llvm-symbolizer-split-dwarf-empty.test Use %T instead of cd'ing to Output directly. 2016-04-23 11:01:36 +00:00
llvm-symbolizer-zlib.test Recommit r270547 ([llvm-dwarfdump] - Teach dwarfdump to decompress debug sections in zlib style.) 2016-05-24 12:48:46 +00:00
llvm-symbolizer.test llvm-symbolizer: prefer .dwo contents over fission-gmlt-like-data when .dwo file is present 2016-04-22 21:32:59 +00:00
macro_link.ll [Debug Info] Added a LIT test that covers the fix committed in rL277290. 2016-08-11 07:22:53 +00:00
member-pointers.o Revert "Revert "DI: Fold constant arguments into a single MDString"" 2014-10-03 20:01:09 +00:00
missing-abstract-variable.o Revert "Revert "DI: Fold constant arguments into a single MDString"" 2014-10-03 20:01:09 +00:00
skeletoncu.ll Unxfail passing tests on Hexagon 2016-08-19 15:07:58 +00:00
strip-DIGlobalVariable.ll Teach llvm::StripDebugInfo() about global variable !dbg attachments. 2016-10-10 17:53:33 +00:00