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134 Commits

Author SHA1 Message Date
Andrew Trick
8c219ecd1a Test case for r140670: indvars should hoist sext. 
llvm-svn: 140671
 2011-09-28 02:13:32 +00:00
Benjamin Kramer
547b6c5ecd Stop emitting instructions with the name "tmp" they eat up memory and have to be uniqued, without any benefit. 
If someone prefers %tmp42 to %42, run instnamer.

llvm-svn: 140634
 2011-09-27 20:39:19 +00:00
Andrew Trick
7251e41b16 [indvars] Fix PR10946: SCEV cannot handle Vector IVs. 
llvm-svn: 140026
 2011-09-19 17:54:39 +00:00
Andrew Trick
74111ee07f Reapply r139759. Disable IV rewriting by default. See PR10916. 
llvm-svn: 139842
 2011-09-15 20:58:37 +00:00
Andrew Trick
f9f68b816b [indvars] Revert r139579 until 401.bzip -arch i386 miscompilation is fixed. PR10920. 
llvm-svn: 139583
 2011-09-13 05:23:49 +00:00
Andrew Trick
061d811c51 Disable IV rewriting by default. See PR10916. 
llvm-svn: 139579
 2011-09-13 03:23:21 +00:00
Andrew Trick
3de5b8e4c1 [indvars] Fix bugs in floating point IV range checks noticed by inspection. 
llvm-svn: 139574
 2011-09-13 01:59:32 +00:00
Andrew Trick
54a109845d Conditionalize indvars test that relies on SCEV expansion of geps, 
which is only relevant with canonical IVs

llvm-svn: 139556
 2011-09-12 23:13:57 +00:00
Andrew Trick
a8315c3f2b indvars test only relevant for -enable-iv-rewrite. 
Otherwise this case is now covered by no-iv-rewrite.ll.

llvm-svn: 139552
 2011-09-12 22:59:00 +00:00
Andrew Trick
d2e61e1f70 Conditionalize indvars tests that rely on SCEV expansion of geps, 
which is relevant with canonical IVs. Anything else being checked by
these tests is already covered by early CSE.

llvm-svn: 139535
 2011-09-12 20:26:34 +00:00
Andrew Trick
30e8db98b8 Removing indvars tests that directly test canonical IVs and nothing else. 
llvm-svn: 139518
 2011-09-12 18:33:08 +00:00
Andrew Trick
183013d8d4 Rename -disable-iv-rewrite to -enable-iv-rewrite=false in preparation for default change. 
llvm-svn: 139517
 2011-09-12 18:28:44 +00:00
Andrew Trick
8c6fb3af6e Test case for r139453, WidenIV::GetExtendedOperandRecurrence. 
llvm-svn: 139504
 2011-09-12 17:20:57 +00:00
Bill Wendling
3b17c1b48d Update to new EH scheme. 
llvm-svn: 138927
 2011-09-01 01:02:41 +00:00
Bill Wendling
eed1e8905a Don't sink landingpad instructions during ind-var simplification. 
llvm-svn: 138651
 2011-08-26 20:40:15 +00:00
Andrew Trick
6d45a01b67 Made SCEV's UDiv expressions more canonical. When dividing a 
recurrence, the initial values low bits can sometimes be ignored.

To take advantage of this, added FoldIVUser to IndVarSimplify to fold
an IV operand into a udiv/lshr if the operator doesn't affect the
result.

-indvars -disable-iv-rewrite now transforms

i = phi i4
i1 = i0 + 1
idx = i1 >> (2 or more)
i4 = i + 4

into

i = phi i4
idx = i0 >> ...
i4 = i + 4

llvm-svn: 137013
 2011-08-06 07:00:37 +00:00
Andrew Trick
638b355a16 indvars: Added getInsertPointForUses to find a valid place to truncate the IV. 
llvm-svn: 135568
 2011-07-20 05:32:06 +00:00
Andrew Trick
f53622e129 indvars test case for r135558. 
llvm-svn: 135559
 2011-07-20 02:14:37 +00:00
Andrew Trick
c5dd3e976a indvars -disable-iv-rewrite fix: derived GEP IVs 
llvm-svn: 135558
 2011-07-20 02:08:58 +00:00
Andrew Trick
7da2417c8a indvars: LinearFunctionTestReplace for non-canonical IVs. 
For -disable-iv-rewrite, perform LFTR without generating a new
"canonical" induction variable. Instead find the "best" existing
induction variable for use in the loop exit test and compute the final
value of that IV for use in the new loop exit test. In short,
convert to a simple eq/ne exit test as long as it's cheap to do so.

llvm-svn: 135420
 2011-07-18 20:32:31 +00:00
Andrew Trick
3239055dee indvars -disable-iv-rewrite: Added SimplifyCongruentIVs. 
llvm-svn: 134530
 2011-07-06 20:50:43 +00:00
Andrew Trick
6d12309475 indvars -disable-iv-rewrite: bug fix involving weird geps and related cleanup. 
llvm-svn: 134306
 2011-07-02 02:34:25 +00:00
Andrew Trick
efe89ad414 indvars -disable-iv-rewrite: handle cloning binary operators that cannot overflow. 
llvm-svn: 134177
 2011-06-30 19:02:17 +00:00
Andrew Trick
cc68605353 indvars -disable-iv-rewrite: handle an edge case involving identity phis. 
llvm-svn: 134124
 2011-06-30 01:27:23 +00:00
Andrew Trick
ecdd6e4c67 indvars -disable-iv-rewrite: insert new trunc instructions carefully. 
llvm-svn: 134112
 2011-06-29 23:03:57 +00:00
Andrew Trick
efe2b1963d indvars -disable-iv-rewrite: just because SCEV ignores casts doesn't 
mean they can be removed.

llvm-svn: 134054
 2011-06-29 03:13:40 +00:00
Andrew Trick
9083ef1918 FileCheckify and prepare for -disable-iv-rewrite. 
llvm-svn: 133998
 2011-06-28 06:34:10 +00:00
Andrew Trick
69d4452f2e indvars -disable-iv-rewrite: Adds support for eliminating identity 
ops.

This is a rewrite of the IV simplification algorithm used by
-disable-iv-rewrite. To avoid perturbing the default mode, I
temporarily split the driver and created SimplifyIVUsersNoRewrite. The
idea is to avoid doing opcode/pattern matching inside
IndVarSimplify. SCEV already does it. We want to optimize with the
full generality of SCEV, but optimize def-use chains top down on-demand rather
than rewriting the entire expression bottom-up. This was easy to do
for operations that SCEV can prove are identity function. So we're now
eliminating bitmasks and zero extends this way.

A result of this rewrite is that indvars -disable-iv-rewrite no longer
requires IVUsers.

llvm-svn: 133502
 2011-06-21 03:22:38 +00:00
Chris Lattner
b90ed2233c manually upgrade a bunch of tests to modern syntax, and remove some that 
are either unreduced or only test old syntax.

llvm-svn: 133228
 2011-06-17 03:14:27 +00:00
Andrew Trick
443332deca Test case pasto (failed when run with IR verifier). 
llvm-svn: 132516
 2011-06-02 23:57:27 +00:00
Andrew Trick
812276eed4 scev: Better sign-extend removal. Normalize postincrement recurrences 
so that their sign extended forms are congruent when no overflow occurs.

llvm-svn: 132360
 2011-05-31 21:17:47 +00:00
Andrew Trick
7fac79e255 indvars: incremental fixes for -disable-iv-rewrite and testcases. 
Use a proper worklist for use-def traversal without holding onto an
iterator. Now that we process all IV uses, we need complete logic for
resusing existing derived IV defs. See HoistStep.

llvm-svn: 132103
 2011-05-26 00:46:11 +00:00
Andrew Trick
eb3c36e69c indvars: fixed IV cloning in -disable-iv-rewrite mode with associated 
cleanup and overdue test cases.

llvm-svn: 132038
 2011-05-25 04:42:22 +00:00
Andrew Trick
37f0082804 FileCheck-ize a couple of IV unit tests. 
llvm-svn: 131946
 2011-05-24 01:02:49 +00:00
Andrew Trick
1ea0243bd0 Test case for r130799 - indvars: Added canExpandBackEdgeTakenCount. 
llvm-svn: 131939
 2011-05-24 00:17:53 +00:00
Andrew Trick
29ac7b8858 Fixes PR9730: indvars: An asserting value handle still pointed to this value 
Modified LinearFunctionTestReplace to push the condition on the dead
list instead of eagerly deleting it. This can cause unnecessary
IV rewrites, which should have no effect on codegen and will not be an
issue once we stop generating canonical IVs.

llvm-svn: 130340
 2011-04-27 23:00:03 +00:00
Andrew Trick
1c4b42d00f Avoid creating canonical induction variables for non-native types. 
For example, on 32-bit architecture, don't promote all uses of the IV
to 64-bits just because one use is a 64-bit cast.
Alternate implementation of the patch by Arnaud de Grandmaison.

llvm-svn: 127884
 2011-03-18 16:50:32 +00:00
Devang Patel
57da4caa85 Remove LoopIndexSplit pass. It is neither maintained nor used by anyone. 
llvm-svn: 116004
 2010-10-07 23:29:37 +00:00
Chris Lattner
65fb25a257 more test cleanup 
llvm-svn: 112892
 2010-09-02 22:38:56 +00:00
Duncan Sands
8dda07428a Print the number of uses of a function in the .ll since it can be informative 
and there seems to be no reason not to.

llvm-svn: 112812
 2010-09-02 08:52:23 +00:00
Duncan Sands
68c30907cc Correct bogus module triple specifications. 
llvm-svn: 112469
 2010-08-30 10:48:29 +00:00
Dan Gohman
cd83870faf Fix SCEVExpander::visitAddRecExpr so that it remembers the induction variable 
it inserted rather than using LoopInfo::getCanonicalInductionVariable to
rediscover it, since that doesn't work on non-canonical loops. This fixes
infinite recurrsion on such loops; PR7562.

llvm-svn: 109419
 2010-07-26 18:28:14 +00:00
Dan Gohman
c6eefe4d4e Fix this test. 
llvm-svn: 108491
 2010-07-16 01:28:45 +00:00
Dan Gohman
fbbdfcaea7 Fix the order that SCEVExpander considers add operands in so that 
it doesn't miss an opportunity to form a GEP, regardless of the
relative loop depths of the operands. This fixes rdar://8197217.

llvm-svn: 108475
 2010-07-15 23:38:13 +00:00
Dan Gohman
ae36b1ed42 Fix ScalarEvolution's tripcount computation for chains of loops 
where each loop's induction variable's start value is the exit
value of a preceding loop.

llvm-svn: 107224
 2010-06-29 23:43:06 +00:00
Dan Gohman
f3aea7aecf Disable indvars on loops when LoopSimplify form is not available. 
This fixes PR7333.

llvm-svn: 106267
 2010-06-18 01:35:11 +00:00
Rafael Espindola
29dda21e96 Remove arm_apcscc from the test files. It is the default and doing this 
matches what llvm-gcc and clang now produce.

llvm-svn: 106221
 2010-06-17 15:18:27 +00:00
Dan Gohman
e637ff5e9a Remove the Expr member from IVUsers. Instead of remembering the expression, 
just ask ScalarEvolution for it on demand. This helps IVUsers be more robust
in the case of expressions changing underneath it. This fixes PR6862.

llvm-svn: 101819
 2010-04-19 21:48:58 +00:00
Nick Lewycky
fbe8d2803d Fix declarations in a few more tests. 
llvm-svn: 101676
 2010-04-17 21:29:25 +00:00
Dan Gohman
7ef0dc2163 Teach ScalarEvolution to simplify smax and umax when it can prove 
that one operand is always greater than another.

llvm-svn: 101142
 2010-04-13 16:51:03 +00:00