Eli Friedman [Wed, 26 Oct 2011 00:55:23 +0000 (00:55 +0000)]
Add a note about the removal of the atomic intrinsics to the "Major Changes" section of the release notes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142998
91177308-0d34-0410-b5e6-
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Eric Christopher [Wed, 26 Oct 2011 00:52:13 +0000 (00:52 +0000)]
Search for and use the strip program and pass it to install for it
to use for stripping final executables.
Patch by Simon Atanasyan!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142997
91177308-0d34-0410-b5e6-
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Eric Christopher [Wed, 26 Oct 2011 00:42:12 +0000 (00:42 +0000)]
Handle newer cases for freebsd which is approaching 10.0 and not 1.0.
Patch by Dimitry Andric!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142995
91177308-0d34-0410-b5e6-
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Eli Friedman [Wed, 26 Oct 2011 00:36:41 +0000 (00:36 +0000)]
Remove dead atomic intrinsics from LangRef.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142994
91177308-0d34-0410-b5e6-
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Mon P Wang [Wed, 26 Oct 2011 00:34:48 +0000 (00:34 +0000)]
The bitcode reader can create an shuffle with a place holder mask which it will
fix up later. For this special case, allow such a mask to be considered valid.
<rdar://problem/
8622574>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142992
91177308-0d34-0410-b5e6-
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Bill Wendling [Wed, 26 Oct 2011 00:17:54 +0000 (00:17 +0000)]
Add mention of AddressSanitizer to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142991
91177308-0d34-0410-b5e6-
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Bill Wendling [Wed, 26 Oct 2011 00:16:17 +0000 (00:16 +0000)]
Add mention of Mono to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142990
91177308-0d34-0410-b5e6-
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Bill Wendling [Wed, 26 Oct 2011 00:14:36 +0000 (00:14 +0000)]
Add mention of ClamAV to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142989
91177308-0d34-0410-b5e6-
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Bill Wendling [Wed, 26 Oct 2011 00:12:04 +0000 (00:12 +0000)]
Add mention of Renderscript to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142988
91177308-0d34-0410-b5e6-
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Bill Wendling [Wed, 26 Oct 2011 00:09:55 +0000 (00:09 +0000)]
Add mention of GHC to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142987
91177308-0d34-0410-b5e6-
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Michael J. Spencer [Tue, 25 Oct 2011 22:45:47 +0000 (22:45 +0000)]
llvm-nm: Use correct format string. Patch by Stepan Dyatkovskiy!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142984
91177308-0d34-0410-b5e6-
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Michael J. Spencer [Tue, 25 Oct 2011 22:31:11 +0000 (22:31 +0000)]
Object/Archive: Cleanup anon namespace.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142983
91177308-0d34-0410-b5e6-
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Michael J. Spencer [Tue, 25 Oct 2011 22:30:58 +0000 (22:30 +0000)]
Object: change test to create archive.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142982
91177308-0d34-0410-b5e6-
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Michael J. Spencer [Tue, 25 Oct 2011 22:30:42 +0000 (22:30 +0000)]
Object/Archive: Add BSD style long file name support and skip internal members.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142981
91177308-0d34-0410-b5e6-
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Owen Anderson [Tue, 25 Oct 2011 20:44:00 +0000 (20:44 +0000)]
Remove extraneous printing of "-PC".
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142970
91177308-0d34-0410-b5e6-
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Bill Wendling [Tue, 25 Oct 2011 20:40:26 +0000 (20:40 +0000)]
Add mention of SAFECode to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142966
91177308-0d34-0410-b5e6-
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Bill Wendling [Tue, 25 Oct 2011 20:39:06 +0000 (20:39 +0000)]
Add mention of Pure to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142965
91177308-0d34-0410-b5e6-
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Bill Wendling [Tue, 25 Oct 2011 20:37:45 +0000 (20:37 +0000)]
Add mention of Portable OpenCL to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142963
91177308-0d34-0410-b5e6-
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Owen Anderson [Tue, 25 Oct 2011 20:35:53 +0000 (20:35 +0000)]
Add support for the notion of "hidden" relocations. On MachO, these are relocation entries that are used as additional information for other, real relocations, rather than being relocations themselves.
I'm not familiar enough with ELF or COFF to know if they should have any relocations marked hidden.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142961
91177308-0d34-0410-b5e6-
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Bill Wendling [Tue, 25 Oct 2011 20:35:31 +0000 (20:35 +0000)]
Add mention of gwScript to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142960
91177308-0d34-0410-b5e6-
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Eli Friedman [Tue, 25 Oct 2011 20:34:22 +0000 (20:34 +0000)]
Remove a couple redundant checks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142959
91177308-0d34-0410-b5e6-
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Chad Rosier [Tue, 25 Oct 2011 20:33:19 +0000 (20:33 +0000)]
Add a few test cases to ensure the bitcode reader is backward compatible with
LLVM 2.9. My understanding is that we plan to maintain compatibility with 2.9
until the 3.1 release. At that time we can generate new test cases using LLVM
3.0.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142958
91177308-0d34-0410-b5e6-
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Jim Grosbach [Tue, 25 Oct 2011 20:30:48 +0000 (20:30 +0000)]
Make assert() message more informative.
PR11217.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142956
91177308-0d34-0410-b5e6-
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Bill Wendling [Tue, 25 Oct 2011 20:27:37 +0000 (20:27 +0000)]
Add mention of Tart to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142955
91177308-0d34-0410-b5e6-
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Bill Wendling [Tue, 25 Oct 2011 20:24:32 +0000 (20:24 +0000)]
Add TTA-based Co-design Environment to external OS projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142954
91177308-0d34-0410-b5e6-
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Owen Anderson [Tue, 25 Oct 2011 20:15:39 +0000 (20:15 +0000)]
Fix off-by-one error when printing relocations inline with disassembly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142952
91177308-0d34-0410-b5e6-
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Bruno Cardoso Lopes [Tue, 25 Oct 2011 20:09:31 +0000 (20:09 +0000)]
According to Mips folks, the backend is now generally reliable (they can
compile and use a bunch of stuff using o32 abi). Also the rt-rk.com team
claims that the JIT support they contributed, is complete for the mips
"static" relocation model.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142950
91177308-0d34-0410-b5e6-
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Chad Rosier [Tue, 25 Oct 2011 19:59:50 +0000 (19:59 +0000)]
Simplify tests by not piping them through llvm-dis.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142948
91177308-0d34-0410-b5e6-
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Owen Anderson [Tue, 25 Oct 2011 18:48:41 +0000 (18:48 +0000)]
Teach the MachO relocation pretty-printer to interpret ARM half-relocations.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142938
91177308-0d34-0410-b5e6-
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Bruno Cardoso Lopes [Tue, 25 Oct 2011 18:13:20 +0000 (18:13 +0000)]
This is the first of several patches for Mips direct object generation.
This first patch is for expression variable kinds.
Patch by Jack Carter!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142934
91177308-0d34-0410-b5e6-
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Bruno Cardoso Lopes [Tue, 25 Oct 2011 17:30:47 +0000 (17:30 +0000)]
Corrects previously incorrect $sp change in MipsCompilationCallback.
The address for $sp, and addresses for sdc1/ldc1 must be 8-byte aligned
Patch by Petar Jovanovic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142930
91177308-0d34-0410-b5e6-
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Duncan Sands [Tue, 25 Oct 2011 12:30:22 +0000 (12:30 +0000)]
Revert commit 142891. Takumi bisected the tablegen miscompiles
down to this commit. Original commit message:
An MBB which branches to an EH landing pad shouldn't be considered for tail merging.
In SjLj EH, the jump to the landing pad is not done explicitly through a branch
statement. The EH landing pad is added as a successor to the throwing
BB. Because of that however, the branch folding pass could mistakenly think that
it could merge the throwing BB with another BB. This isn't safe to do.
<rdar://problem/
10334833>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142920
91177308-0d34-0410-b5e6-
96231b3b80d8
Duncan Sands [Tue, 25 Oct 2011 12:28:52 +0000 (12:28 +0000)]
Restore commits 142790 and 142843 - they weren't breaking the build
bots. Original commit messages:
- Reapply r142781 with fix. Original message:
Enhance SCEV's brute force loop analysis to handle multiple PHI nodes in the
loop header when computing the trip count.
With this, we now constant evaluate:
struct ListNode { const struct ListNode *next; int i; };
static const struct ListNode node1 = {0, 1};
static const struct ListNode node2 = {&node1, 2};
static const struct ListNode node3 = {&node2, 3};
int test() {
int sum = 0;
for (const struct ListNode *n = &node3; n != 0; n = n->next)
sum += n->i;
return sum;
}
- Now that we look at all the header PHIs, we need to consider all the header PHIs
when deciding that the loop has stopped evolving. Fixes miscompile in the gcc
torture testsuite!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142919
91177308-0d34-0410-b5e6-
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Chandler Carruth [Tue, 25 Oct 2011 09:47:41 +0000 (09:47 +0000)]
Fix the API usage in loop probability heuristics. It was incorrectly
classifying many edges as exiting which were in fact not. These mainly
formed edges into sub-loops. It was also not correctly classifying all
returning edges out of loops as leaving the loop. With this match most
of the loop heuristics are more rational.
Several serious regressions on loop-intesive benchmarks like perlbench's
loop tests when built with -enable-block-placement are fixed by these
updated heuristics. Unfortunately they in turn uncover some other
regressions. There are still several improvemenst that should be made to
loop heuristics including trip-count, and early back-edge management.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142917
91177308-0d34-0410-b5e6-
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Duncan Sands [Tue, 25 Oct 2011 09:26:43 +0000 (09:26 +0000)]
Speculatively revert commits 142790 and 142843 to see if it fixes
the dragonegg and llvm-gcc self-host buildbots. Original commit
messages:
- Reapply r142781 with fix. Original message:
Enhance SCEV's brute force loop analysis to handle multiple PHI nodes in the
loop header when computing the trip count.
With this, we now constant evaluate:
struct ListNode { const struct ListNode *next; int i; };
static const struct ListNode node1 = {0, 1};
static const struct ListNode node2 = {&node1, 2};
static const struct ListNode node3 = {&node2, 3};
int test() {
int sum = 0;
for (const struct ListNode *n = &node3; n != 0; n = n->next)
sum += n->i;
return sum;
}
- Now that we look at all the header PHIs, we need to consider all the header PHIs
when deciding that the loop has stopped evolving. Fixes miscompile in the gcc
torture testsuite!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142916
91177308-0d34-0410-b5e6-
96231b3b80d8
Nick Lewycky [Tue, 25 Oct 2011 07:05:26 +0000 (07:05 +0000)]
Remove dead enum value. There is no DIESectionOffset.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142912
91177308-0d34-0410-b5e6-
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Chad Rosier [Tue, 25 Oct 2011 01:22:20 +0000 (01:22 +0000)]
Fix these test cases to not use .bc files. Otherwise, we run into issues with
bitcode reader/writer backward compatibility.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142896
91177308-0d34-0410-b5e6-
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Bill Wendling [Tue, 25 Oct 2011 01:01:42 +0000 (01:01 +0000)]
Comment out external projects so that they can be refreshed for 3.0.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142893
91177308-0d34-0410-b5e6-
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Eric Christopher [Tue, 25 Oct 2011 00:55:35 +0000 (00:55 +0000)]
Remove unused forward decl.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142892
91177308-0d34-0410-b5e6-
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Bill Wendling [Tue, 25 Oct 2011 00:54:05 +0000 (00:54 +0000)]
An MBB which branches to an EH landing pad shouldn't be considered for tail merging.
In SjLj EH, the jump to the landing pad is not done explicitly through a branch
statement. The EH landing pad is added as a successor to the throwing
BB. Because of that however, the branch folding pass could mistakenly think that
it could merge the throwing BB with another BB. This isn't safe to do.
<rdar://problem/
10334833>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142891
91177308-0d34-0410-b5e6-
96231b3b80d8
Dan Gohman [Tue, 25 Oct 2011 00:36:31 +0000 (00:36 +0000)]
Really remove Blackfin from the configure script.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142889
91177308-0d34-0410-b5e6-
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Jim Grosbach [Tue, 25 Oct 2011 00:14:01 +0000 (00:14 +0000)]
ARM assembly parsing and encoding for VLD1 with writeback.
Four entry register lists.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142882
91177308-0d34-0410-b5e6-
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Dan Gohman [Tue, 25 Oct 2011 00:05:42 +0000 (00:05 +0000)]
Remove the Blackfin backend.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142880
91177308-0d34-0410-b5e6-
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Dan Gohman [Mon, 24 Oct 2011 23:48:32 +0000 (23:48 +0000)]
Remove the SystemZ backend.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142878
91177308-0d34-0410-b5e6-
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Jim Grosbach [Mon, 24 Oct 2011 23:40:46 +0000 (23:40 +0000)]
Nuke dead code. Nothing generates the VLD1d64QPseudo_UPD instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142877
91177308-0d34-0410-b5e6-
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Jim Grosbach [Mon, 24 Oct 2011 23:26:05 +0000 (23:26 +0000)]
ARM assembly parsing and encoding for VLD1 w/ writeback.
Three entry register list variation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142876
91177308-0d34-0410-b5e6-
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Owen Anderson [Mon, 24 Oct 2011 23:20:07 +0000 (23:20 +0000)]
More fixes and improvements to MachO relocation pretty-printing, particular for x86 and x86_64 relocations with addends.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142875
91177308-0d34-0410-b5e6-
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Eli Friedman [Mon, 24 Oct 2011 23:08:52 +0000 (23:08 +0000)]
Don't crash on variable insertelement on ARM. PR10258.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142871
91177308-0d34-0410-b5e6-
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Bill Wendling [Mon, 24 Oct 2011 23:05:43 +0000 (23:05 +0000)]
Check the visibility of the global variable before placing it into the stubs
table. A hidden variable could potentially end up in both lists.
<rdar://problem/
10336715>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142869
91177308-0d34-0410-b5e6-
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Evan Cheng [Mon, 24 Oct 2011 23:01:03 +0000 (23:01 +0000)]
ARMConstantPoolMBB::print should print BB number.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142867
91177308-0d34-0410-b5e6-
96231b3b80d8
Jim Grosbach [Mon, 24 Oct 2011 22:16:58 +0000 (22:16 +0000)]
ARM assembly parsing and encoding for VLD1 w/ writeback.
One and two length register list variants.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142861
91177308-0d34-0410-b5e6-
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Chad Rosier [Mon, 24 Oct 2011 21:56:50 +0000 (21:56 +0000)]
Add options to enable each individual level for the show-diagnostics tool.
rdar://
9683410
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142856
91177308-0d34-0410-b5e6-
96231b3b80d8
Jim Grosbach [Mon, 24 Oct 2011 21:45:13 +0000 (21:45 +0000)]
ARM refactor am6offset usage for VLD1.
Split am6offset into fixed and register offset variants so the instruction
encodings are explicit rather than relying an a magic reg0 marker.
Needed to being able to parse these.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142853
91177308-0d34-0410-b5e6-
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Owen Anderson [Mon, 24 Oct 2011 21:44:00 +0000 (21:44 +0000)]
Get relocation parsing/dumping to a mostly-working state for MachO files.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142852
91177308-0d34-0410-b5e6-
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Nick Lewycky [Mon, 24 Oct 2011 21:02:38 +0000 (21:02 +0000)]
Now that we look at all the header PHIs, we need to consider all the header PHIs
when deciding that the loop has stopped evolving. Fixes miscompile in the gcc
torture testsuite!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142843
91177308-0d34-0410-b5e6-
96231b3b80d8
Eli Friedman [Mon, 24 Oct 2011 20:24:21 +0000 (20:24 +0000)]
Add support to the old JIT for acquire/release loads and stores on x86. PR11207.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142841
91177308-0d34-0410-b5e6-
96231b3b80d8
Owen Anderson [Mon, 24 Oct 2011 20:19:18 +0000 (20:19 +0000)]
Stub out some of the MachO relocation decoding hooks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142840
91177308-0d34-0410-b5e6-
96231b3b80d8
Douglas Gregor [Mon, 24 Oct 2011 18:10:52 +0000 (18:10 +0000)]
Really unbreak CMake build
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142822
91177308-0d34-0410-b5e6-
96231b3b80d8
Douglas Gregor [Mon, 24 Oct 2011 18:09:23 +0000 (18:09 +0000)]
Unbreak CMake build
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142821
91177308-0d34-0410-b5e6-
96231b3b80d8
Owen Anderson [Mon, 24 Oct 2011 18:04:29 +0000 (18:04 +0000)]
Fix a NEON disassembly case that was broken in the recent refactorings. As more of this code gets refactored, a lot of these manual decoding hooks should get smaller and/or go away entirely.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142817
91177308-0d34-0410-b5e6-
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Dan Gohman [Mon, 24 Oct 2011 18:01:06 +0000 (18:01 +0000)]
Delete the top-down "Latency" scheduler. Top-down scheduling doesn't handle
physreg dependencies, and upcoming codegen changes will require proper
physreg dependence handling.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142816
91177308-0d34-0410-b5e6-
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Dan Gohman [Mon, 24 Oct 2011 17:56:48 +0000 (17:56 +0000)]
Delete the Latency scheduling preference.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142815
91177308-0d34-0410-b5e6-
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Dan Gohman [Mon, 24 Oct 2011 17:55:11 +0000 (17:55 +0000)]
Change this overloaded use of Sched::Latency to be an overloaded
use of Sched::ILP instead, as Sched::Latency is going away.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142813
91177308-0d34-0410-b5e6-
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Dan Gohman [Mon, 24 Oct 2011 17:53:16 +0000 (17:53 +0000)]
Remove the explicit request for "Latency" scheduling from MSP430,
as the Latency scheduler is going away.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142811
91177308-0d34-0410-b5e6-
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Dan Gohman [Mon, 24 Oct 2011 17:45:02 +0000 (17:45 +0000)]
Change the default scheduler from Latency to ILP, since Latency
is going away.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142810
91177308-0d34-0410-b5e6-
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Jim Grosbach [Mon, 24 Oct 2011 17:26:26 +0000 (17:26 +0000)]
Update test for r142801.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142806
91177308-0d34-0410-b5e6-
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Benjamin Kramer [Mon, 24 Oct 2011 17:24:05 +0000 (17:24 +0000)]
XFAIL test on leak checkers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142804
91177308-0d34-0410-b5e6-
96231b3b80d8
Jim Grosbach [Mon, 24 Oct 2011 17:16:24 +0000 (17:16 +0000)]
Thumb2 LDM instructions can target PC. Make sure to encode it.
PR11220
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142801
91177308-0d34-0410-b5e6-
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Bill Wendling [Mon, 24 Oct 2011 17:12:36 +0000 (17:12 +0000)]
Cleanup. Get rid of the old SjLj EH lowering code. No functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142800
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Chandler Carruth [Mon, 24 Oct 2011 16:51:55 +0000 (16:51 +0000)]
Sink an otherwise unused variable's initializer into the asserts that
used it. Fixes an unused variable warning from GCC on release builds.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142799
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Benjamin Kramer [Mon, 24 Oct 2011 13:50:56 +0000 (13:50 +0000)]
Implement comparison operators for BranchProbability in a way that can't overflow INT64_MAX.
Add a test case for the edge case that triggers this. Thanks to Chandler for bringing this to my attention.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142794
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Chandler Carruth [Mon, 24 Oct 2011 12:01:08 +0000 (12:01 +0000)]
Remove return heuristics from the static branch probabilities, and
introduce no-return or unreachable heuristics.
The return heuristics from the Ball and Larus paper don't work well in
practice as they pessimize early return paths. The only good hitrate
return heuristics are those for:
- NULL return
- Constant return
- negative integer return
Only the last of these three can possibly require significant code for
the returning block, and even the last is fairly rare and usually also
a constant. As a consequence, even for the cold return paths, there is
little code on that return path, and so little code density to be gained
by sinking it. The places where sinking these blocks is valuable (inner
loops) will already be weighted appropriately as the edge is a loop-exit
branch.
All of this aside, early returns are nearly as common as all three of
these return categories, and should actually be predicted as taken!
Rather than muddy the waters of the static predictions, just remain
silent on returns and let the CFG itself dictate any layout or other
issues.
However, the return heuristic was flagging one very important case:
unreachable. Unfortunately it still gave a 1/4 chance of the
branch-to-unreachable occuring. It also didn't do a rigorous job of
finding those blocks which post-dominate an unreachable block.
This patch builds a more powerful analysis that should flag all branches
to blocks known to then reach unreachable. It also has better worst-case
runtime complexity by not looping through successors for each block. The
previous code would perform an N^2 walk in the event of a single entry
block branching to N successors with a switch where each successor falls
through to the next and they finally fall through to a return.
Test case added for noreturn heuristics. Also doxygen comments improved
along the way.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142793
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NAKAMURA Takumi [Mon, 24 Oct 2011 10:03:25 +0000 (10:03 +0000)]
Revert "Test commit"
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142792
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NAKAMURA Takumi [Mon, 24 Oct 2011 10:02:59 +0000 (10:02 +0000)]
Test commit
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142791
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Nick Lewycky [Mon, 24 Oct 2011 06:57:05 +0000 (06:57 +0000)]
Reapply r142781 with fix. Original message:
Enhance SCEV's brute force loop analysis to handle multiple PHI nodes in the
loop header when computing the trip count.
With this, we now constant evaluate:
struct ListNode { const struct ListNode *next; int i; };
static const struct ListNode node1 = {0, 1};
static const struct ListNode node2 = {&node1, 2};
static const struct ListNode node3 = {&node2, 3};
int test() {
int sum = 0;
for (const struct ListNode *n = &node3; n != 0; n = n->next)
sum += n->i;
return sum;
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142790
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Chandler Carruth [Mon, 24 Oct 2011 05:55:58 +0000 (05:55 +0000)]
Doxygen-ify the comments on the public interface for BPI. Also, move the
two more subtle routines to the bottom and expand on their cautionary
comments a bit. No functionality or actual interface change here.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142789
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Nick Lewycky [Mon, 24 Oct 2011 05:51:01 +0000 (05:51 +0000)]
PHI nodes not in the loop header aren't part of the loop iteration initial
state. Furthermore, they might not have two operands. This fixes the underlying
issue behind the crashes introduced in r142781.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142788
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Nick Lewycky [Mon, 24 Oct 2011 04:35:36 +0000 (04:35 +0000)]
A dead malloc, a free(NULL) and a free(undef) are all trivially dead
instructions.
This doesn't introduce any optimizations we weren't doing before (except
potentially due to pass ordering issues), now passes will eliminate them sooner
as part of their own cleanups.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142787
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Nick Lewycky [Mon, 24 Oct 2011 04:00:25 +0000 (04:00 +0000)]
Speculatively revert r142781. Bots are showing
Assertion `i_nocapture < OperandTraits<PHINode>::operands(this) && "getOperand() out of range!"' failed.
coming out of indvars.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142786
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NAKAMURA Takumi [Mon, 24 Oct 2011 03:27:19 +0000 (03:27 +0000)]
Windows/Path.inc: [PR8460] Get rid of ScopedNullTerminator. Thanks to Zvi Rackover!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142785
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Chandler Carruth [Mon, 24 Oct 2011 01:40:45 +0000 (01:40 +0000)]
Simplify the design of BranchProbabilityInfo by collapsing it into
a single class. Previously it was split between two classes, one
internal and one external. The concern seemed to center around exposing
the weights used, but those can remain confined to the implementation
file.
Having a single class to maintain the state and analyses in use will
also simplify several of the enhancements I want to make to our static
heuristics.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142783
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Nick Lewycky [Sun, 23 Oct 2011 23:43:14 +0000 (23:43 +0000)]
Enhance SCEV's brute force loop analysis to handle multiple PHI nodes in the
loop header when computing the trip count.
With this, we now constant evaluate:
struct ListNode { const struct ListNode *next; int i; };
static const struct ListNode node1 = {0, 1};
static const struct ListNode node2 = {&node1, 2};
static const struct ListNode node3 = {&node2, 3};
int test() {
int sum = 0;
for (const struct ListNode *n = &node3; n != 0; n = n->next)
sum += n->i;
return sum;
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142781
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Chandler Carruth [Sun, 23 Oct 2011 22:40:13 +0000 (22:40 +0000)]
Tidy up a loop to be more idiomatic for LLVM's codebase, and remove some
extraneous whitespace. Trying to clean-up this pass as much as I can
before I start making functional changes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142780
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Craig Topper [Sun, 23 Oct 2011 22:18:24 +0000 (22:18 +0000)]
Add X86 SARX, SHRX, and SHLX instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142779
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Chandler Carruth [Sun, 23 Oct 2011 21:21:50 +0000 (21:21 +0000)]
Teach the BranchProbabilityInfo pass to print its results, and use that
to bring it under direct test instead of merely indirectly testing it in
the BlockFrequencyInfo pass.
The next step is to start adding tests for the various heuristics
employed, and to start fixing those heuristics once they're under test.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142778
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Bill Wendling [Sun, 23 Oct 2011 20:14:06 +0000 (20:14 +0000)]
Rename the script to indicate that this is for the TEST=simple tests.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142764
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Bill Wendling [Sun, 23 Oct 2011 20:13:14 +0000 (20:13 +0000)]
Resurrect the 'find regressions for the TEST=nightly tests' script.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142763
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Chandler Carruth [Sun, 23 Oct 2011 20:10:34 +0000 (20:10 +0000)]
Now that we have comparison on probabilities, add some static functions
to get important constant branch probabilities and use them for finding
the best branch out of a set of possibilities.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142762
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Chandler Carruth [Sun, 23 Oct 2011 20:10:30 +0000 (20:10 +0000)]
Remove a commented out line of code that snuck by my auditing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142761
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Benjamin Kramer [Sun, 23 Oct 2011 11:32:54 +0000 (11:32 +0000)]
Print branch probabilities as percentages.
50% is much more readable than 5.
000000e-01.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142752
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Benjamin Kramer [Sun, 23 Oct 2011 11:19:14 +0000 (11:19 +0000)]
Add compare operators to BranchProbability and use it to determine if an edge is hot.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142751
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Chandler Carruth [Sun, 23 Oct 2011 09:18:45 +0000 (09:18 +0000)]
Completely re-write the algorithm behind MachineBlockPlacement based on
discussions with Andy. Fundamentally, the previous algorithm is both
counter productive on several fronts and prioritizing things which
aren't necessarily the most important: static branch prediction.
The new algorithm uses the existing loop CFG structure information to
walk through the CFG itself to layout blocks. It coalesces adjacent
blocks within the loop where the CFG allows based on the most likely
path taken. Finally, it topologically orders the block chains that have
been formed. This allows it to choose a (mostly) topologically valid
ordering which still priorizes fallthrough within the structural
constraints.
As a final twist in the algorithm, it does violate the CFG when it
discovers a "hot" edge, that is an edge that is more than 4x hotter than
the competing edges in the CFG. These are forcibly merged into
a fallthrough chain.
Future transformations that need te be added are rotation of loop exit
conditions to be fallthrough, and better isolation of cold block chains.
I'm also planning on adding statistics to model how well the algorithm
does at laying out blocks based on the probabilities it receives.
The old tests mostly still pass, and I have some new tests to add, but
the nested loops are still behaving very strangely. This almost seems
like working-as-intended as it rotated the exit branch to be
fallthrough, but I'm not convinced this is actually the best layout. It
is well supported by the probabilities for loops we currently get, but
those are pretty broken for nested loops, so this may change later.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142743
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Craig Topper [Sun, 23 Oct 2011 07:34:00 +0000 (07:34 +0000)]
Add X86 RORX instruction
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142741
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Cameron Zwarich [Sun, 23 Oct 2011 07:02:10 +0000 (07:02 +0000)]
The element insertion code in scalar replacement doesn't handle incorrect
element types, even though the element extraction code does. It is surprising
that this bug has been here for so long. Fixes <rdar://problem/
10318778>.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142740
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Craig Topper [Sun, 23 Oct 2011 00:33:32 +0000 (00:33 +0000)]
Add X86 MULX instruction for disassembler.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142738
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Craig Topper [Sat, 22 Oct 2011 23:13:53 +0000 (23:13 +0000)]
Remove some duplicate specifying of neverHasSideEffects and mayLoad from X86 multiply instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142737
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Nick Lewycky [Sat, 22 Oct 2011 22:07:31 +0000 (22:07 +0000)]
Oops! Fix test I forgot to submit as part of r142735.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142736
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Nick Lewycky [Sat, 22 Oct 2011 21:59:35 +0000 (21:59 +0000)]
A non-escaping malloc in the entry block is not unlike an alloca. Do dead-store
elimination on them too.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142735
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Nick Lewycky [Sat, 22 Oct 2011 19:58:20 +0000 (19:58 +0000)]
Make SCEV's brute force analysis stronger in two ways. Firstly, we should be
able to constant fold load instructions where the argument is a constant.
Second, we should be able to watch multiple PHI nodes through the loop; this
patch only supports PHIs in loop headers, more can be done here.
With this patch, we now constant evaluate:
static const int arr[] = {1, 2, 3, 4, 5};
int test() {
int sum = 0;
for (int i = 0; i < 5; ++i) sum += arr[i];
return sum;
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142731
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Nadav Rotem [Sat, 22 Oct 2011 18:44:51 +0000 (18:44 +0000)]
Fix a typo.w
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142729
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