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Michael Zolotukhin 20e33533a3 [SCEV] Compute affine range in another way to avoid bitwidth extending. 
Summary:
This approach has two major advantages over the existing one:
1. We don't need to extend bitwidth in our computations. Extending
bitwidth is a big issue for compile time as we often end up working with
APInts wider than 64bit, which is a slow case for APInt.
2. When we zero extend a wrapped range, we lose some information (we
replace the range with [0, 1 << src bit width)). Thus, avoiding such
extensions better preserves information.

Correctness testing:
I ran 'ninja check' with assertions that the new implementation of
getRangeForAffineAR gives the same results as the old one (this
functionality is not present in this patch). There were several failures
- I inspected them manually and found out that they all are caused by
the fact that we're returning more accurate results now (see bullet (2)
above).
Without such assertions 'ninja check' works just fine, as well as
SPEC2006.

Compile time testing:
CTMark/Os:
 - mafft/pairlocalalign	-16.98%
 - tramp3d-v4/tramp3d-v4	-12.72%
 - lencod/lencod	-11.51%
 - Bullet/bullet	-4.36%
 - ClamAV/clamscan	-3.66%
 - 7zip/7zip-benchmark	-3.19%
 - sqlite3/sqlite3	-2.95%
 - SPASS/SPASS	-2.74%
 - Average	-5.81%

Performance testing:
The changes are expected to be neutral for runtime performance.

Reviewers: sanjoy, atrick, pete

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D30477

llvm-svn: 297992
2017-03-16 21:07:38 +00:00
bindings [DebugInfo] Emit address space with DW_AT_address_class attribute for pointer and reference types 2017-03-08 23:55:44 +00:00
cmake [cmake] Refactor warning flag logic to use Unix warnings with clang-cl 2017-03-16 17:05:16 +00:00
docs Revert "[PGO] Value profile for size of memory intrinsic calls" 2017-03-16 13:16:35 +00:00
examples llvm/examples/Kaleidoscope/BuildingAJIT: More fixup corresponding to r295636. 2017-02-20 10:07:41 +00:00
include Clarify a comment about mapped_iterator. NFC 2017-03-16 20:37:59 +00:00
lib [SCEV] Compute affine range in another way to avoid bitwidth extending. 2017-03-16 21:07:38 +00:00
projects [cmake] Include openmp with add_llvm_external_project 2017-03-07 18:54:17 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes [CMake] Handle common options for runtimes build 2017-01-10 19:47:05 +00:00
test [SCEV] Compute affine range in another way to avoid bitwidth extending. 2017-03-16 21:07:38 +00:00
tools Create msbuild only when using MSVC 2017-03-16 20:24:14 +00:00
unittests [Support] Add support for getting file system permissions on Windows and implement sys::fs::set/getPermissions to work with them 2017-03-16 11:22:09 +00:00
utils Removed unnecessary semicolon. NFCI. 2017-03-15 22:50:47 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore [.gitignore] Update .gitignore to ignore a nested build directory 2017-02-24 23:09:30 +00:00
CMakeLists.txt remove Cmake option for LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING 2017-03-07 00:51:07 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take code ownership of instruction scheduling. 2017-03-10 18:34:37 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT CODE_OWNERS: Take code ownership of instruction scheduling. 2017-03-10 18:34:37 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
README.txt Test commit. Added a blank line. 2017-03-06 20:45:33 +00:00
RELEASE_TESTERS.TXT Update the release tester for MIPS. NFC. 2017-01-17 11:00:28 +00:00

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