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Zvi Rackover d91a5044bd LoopVectorize: MaxVF should not be larger than the loop trip count 
Summary:
Improve how MaxVF is computed while taking into account that MaxVF should not be larger than the loop's trip count.

Other than saving on compile-time by pruning the possible MaxVF candidates, this patch fixes pr34438 which exposed the following flow:
1. Short trip count identified -> Don't bail out, set OptForSize:=True to avoid tail-loop and runtime checks.
2. Compute MaxVF returned 16 on a target supporting AVX512.
3. OptForSize -> choose VF:=MaxVF.
4. Bail out because TripCount = 8, VF = 16, TripCount % VF !=0 means we need a tail loop.

With this patch step 2. will choose MaxVF=8 based on TripCount.

Reviewers: Ayal, dorit, mkuper, hfinkel

Reviewed By: hfinkel

Subscribers: hfinkel, llvm-commits

Differential Revision: https://reviews.llvm.org/D37425

llvm-svn: 312472
2017-09-04 08:35:13 +00:00
bindings Update the Go bindings for r309426 (remove offset from llvm.dbg.value) 2017-07-28 22:44:44 +00:00
cmake Move some CLI utils out of llvm-isel-fuzzer and into the library 2017-09-02 23:43:04 +00:00
docs [Docs] Update CodingStandards to recommend range-based for loops 2017-08-31 12:34:20 +00:00
examples [ORC] Add an Error return to the JITCompileCallbackManager::grow method. 2017-09-03 00:50:42 +00:00
include [XRay][CodeGen] Use PIC-friendly code in XRay sleds and remove synthetic references in .text 2017-09-04 05:34:58 +00:00
lib LoopVectorize: MaxVF should not be larger than the loop trip count 2017-09-04 08:35:13 +00:00
projects Add temporary workaround to allow in-tree libc++ builds on Windows 2017-05-11 01:44:30 +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][runtimes] Use target specific name for all runtimes targets 2017-09-02 02:28:03 +00:00
test LoopVectorize: MaxVF should not be larger than the loop trip count 2017-09-04 08:35:13 +00:00
tools Revert "[XRay][tools] Function call stack based analysis tooling for XRay traces" 2017-09-03 00:40:13 +00:00
unittests [ORC] Add an Error return to the JITCompileCallbackManager::grow method. 2017-09-03 00:50:42 +00:00
utils [TableGen] Teach tablegen to allow SDNPCommutable nodes with more than 2 operands. 2017-09-04 03:44:33 +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: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [cmake] Stop putting the revision info in LLVM_VERSION_STRING 2017-08-29 21:44:21 +00:00
CODE_OWNERS.TXT [ARC] Add ARC backend. 2017-08-24 15:40:33 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Another test commit 2017-07-01 03:24:06 +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
README.txt Test commit access 2017-08-18 02:39:28 +00:00
RELEASE_TESTERS.TXT [RelTest] Diana is doing both releases now 2017-07-14 08:33:52 +00:00

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