99f4558117
Revert r54876 r54877 r54906 and r54907. Evan found that these caused a 20%
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slowdown in bzip2.
llvm-svn: 55113
2008-08-21 05:56:10 +00:00
f5a7e51c81
Silence a compiler warning.
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llvm-svn: 55087
2008-08-20 23:36:48 +00:00
1b2c061b73
Fixed shuffle optimizations to handle non power of 2 vectors
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llvm-svn: 55035
2008-08-20 02:23:25 +00:00
75d4a83f2f
Make this comment clearer. Instead of using an ambiguous ~ (not) on an icmp
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predicate, swap the order of the operands.
llvm-svn: 54907
2008-08-17 20:02:02 +00:00
53b44029d6
Consider the case where xor by -1 and xor by 128 have been combined already to
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produce an xor by 127.
llvm-svn: 54906
2008-08-17 19:58:24 +00:00
18c6f56c76
I found a better place for this optz'n.
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llvm-svn: 54877
2008-08-17 07:54:14 +00:00
18f50b2637
Xor'ing both sides of icmp by sign-bit is equivalent to swapping signedness of
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the predicate.
Also, make this optz'n apply in more cases where it's safe to do so.
llvm-svn: 54876
2008-08-17 07:34:14 +00:00
1d23915a8f
use smallvector instead of vector for a couple worklists. This speeds up instcombine
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by ~10% on some testcases.
llvm-svn: 54811
2008-08-15 04:03:01 +00:00
6134fbccef
Fix a bogus srem rule - a negative value srem'd by a power-of-2
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can have a non-negative result; for example, -16%16 is 0. Also,
clarify the related comments. This fixes PR2670.
llvm-svn: 54767
2008-08-13 23:12:35 +00:00
2aa0ff27aa
Implement support for simplifying vector comparisons by 0.0 and 1.0 like we
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do for scalars. Patch contributed by Nicolas Capens
This also generalizes the previous xforms to work on long double, now that
isExactlyValue works for long double.
llvm-svn: 54653
2008-08-11 22:06:05 +00:00
ac22cfcae9
Fix a shufflevector instcombine that was emitting invalid masks indices
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when it meant to be emitting undef indices.
llvm-svn: 54417
2008-08-06 18:17:32 +00:00
f5b353c1fd
optimize a common idiom generated by clang for bitfield access, PR2638.
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llvm-svn: 54408
2008-08-06 07:35:52 +00:00
7bdaecb7f4
Zap sitofp/fptoui pairs. In all cases when the sign difference
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matters, the result is undefined anyway.
llvm-svn: 54396
2008-08-06 05:13:06 +00:00
bf42893567
Reinstate this optimization, but without the miscompile. Thanks to Bill for
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tracking down that this was breaking llvm-gcc bootstrap on Linux.
llvm-svn: 54394
2008-08-06 04:54:03 +00:00
ee12a7aeff
Revert r53282. This was causing a miscompile on Linux. Also, the transformation
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looks bogus. Please see PR2629 for details on why this is breaking things.
llvm-svn: 54372
2008-08-05 21:23:45 +00:00
fecbc8cff1
Add vector shifts to the IR, patch by Eli Friedman.
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CodeGen & Clang work coming next.
llvm-svn: 54161
2008-07-29 15:49:41 +00:00
fa1211f69b
Enable first-class aggregates support.
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Remove the GetResultInst instruction. It is still accepted in LLVM assembly
and bitcode, where it is now auto-upgraded to ExtractValueInst. Also, remove
support for return instructions with multiple values. These are auto-upgraded
to use InsertValueInst instructions.
The IRBuilder still accepts multiple-value returns, and auto-upgrades them
to InsertValueInst instructions.
llvm-svn: 53941
2008-07-23 00:34:11 +00:00
c600c53d1f
Fix PR2553
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llvm-svn: 53715
2008-07-17 06:07:20 +00:00
c1d7477ed2
Redo InstCombiner::visitExtractValueInst. Instead of using the (complicate)
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FindInsertedValue, it now performs a number of simple transformations that
should result in the same effect when applied iteratively.
llvm-svn: 53673
2008-07-16 12:55:45 +00:00
c97094552c
Fix PR2296. Do not transform x86_sse2_storel_dq into a full-width store.
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llvm-svn: 53666
2008-07-16 07:28:14 +00:00
16395e51f4
Fix PR2506 by being a bit more careful about reverse fact propagation when
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disproving a condition. This actually compiles the existing testcase
(udiv_select_to_select_shift) to:
define i64 @test(i64 %X, i1 %Cond) {
entry:
%divisor1.t = lshr i64 %X, 3 ; <i64> [#uses=1]
%quotient2 = lshr i64 %X, 3 ; <i64> [#uses=1]
%sum = add i64 %divisor1.t, %quotient2 ; <i64> [#uses=1]
ret i64 %sum
}
instead of:
define i64 @test(i64 %X, i1 %Cond) {
entry:
%quotient1.v = select i1 %Cond, i64 3, i64 4 ; <i64> [#uses=1]
%quotient1 = lshr i64 %X, %quotient1.v ; <i64> [#uses=1]
%quotient2 = lshr i64 %X, 3 ; <i64> [#uses=1]
%sum = add i64 %quotient1, %quotient2 ; <i64> [#uses=1]
ret i64 %sum
}
llvm-svn: 53534
2008-07-14 00:15:52 +00:00
f76aa23b54
Enhance analysis of srem.
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Remove dead code analyzing urem. 'urem' of power-of-2 is canonicalized to an
'and' instruction.
llvm-svn: 53506
2008-07-12 05:04:38 +00:00
45e127ab20
Document 'mask' in this calculation.
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llvm-svn: 53454
2008-07-11 08:16:26 +00:00
da405e1155
Remove misleading constant from comment.
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llvm-svn: 53452
2008-07-11 07:36:19 +00:00
f95b64acaa
Add another optimization from PR2330. Also catch some missing cases that are
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similar.
llvm-svn: 53451
2008-07-11 07:20:53 +00:00
3994bed1a9
a missed optimization that Eli spotted
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llvm-svn: 53449
2008-07-11 06:40:29 +00:00
13a6911ea2
another bug in the same line.
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llvm-svn: 53448
2008-07-11 06:38:16 +00:00
de89b507dd
fix a bug spotted by Eli's eagle eyes
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llvm-svn: 53447
2008-07-11 06:36:01 +00:00
bd25b8507c
simplify and merge a bunch of code. Instead of comparing against
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the min/max values for an integer type, compare against the min/max
values we can prove contain the input. This might be a tighter bound,
so this is general goodness.
llvm-svn: 53446
2008-07-11 05:40:05 +00:00
38a50c9528
fold away (x <= cst) earlier, allowing us to not have to
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handle them in some code.
llvm-svn: 53445
2008-07-11 05:08:55 +00:00
6af608b8ce
Fix folding of icmp's of i1 where the comparison is signed. The code
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was using the algorithm for folding unsigned comparisons which is
completely wrong. This has been broken since the signless types change.
llvm-svn: 53444
2008-07-11 04:20:58 +00:00
4fa8bb3430
Fix a bogus optimization: folding (slt (zext i1 A to i32), 1) -> (slt i1 A, true)
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This cause a regression in InstCombine/JavaCompare, which was doing the right
thing on accident. To handle the missed case, generalize the comparisons based
on masked bits a little bit to handle comparisons against the max value. For
example, we can now xform (slt i32 (and X, 4), 4) -> (setne i32 (and X, 4), 4)
llvm-svn: 53443
2008-07-11 04:09:09 +00:00
6193a564ab
Fix overzealous optimization. Thanks to Duncan Sands for pointing out my error!
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llvm-svn: 53393
2008-07-10 05:51:40 +00:00
bb89c2a3f6
Simplify, suggested by Chris Lattner.
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llvm-svn: 53283
2008-07-09 07:35:26 +00:00
f9c27c343a
Fold (a < 8) && (b < 8) into (a|b) < 8 for unsigned less or greater than.
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llvm-svn: 53282
2008-07-09 07:29:11 +00:00
364661c43e
Fold ((1 << a) & 1) to (a == 0).
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llvm-svn: 53276
2008-07-09 05:20:13 +00:00
0d3645e673
Reduce x - y to -y when we know the 'x' part will get masked off anyways.
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llvm-svn: 53271
2008-07-09 04:32:37 +00:00
501d78fdc0
Fix PR2496, a really nasty bug which involved sinking volatile loads
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into phis. This is actually the same bug as PR2262 /
2008-04-29-VolatileLoadDontMerge.ll, but I missed checking the first
predecessor for multiple successors. Testcase here:
InstCombine/2008-07-08-VolatileLoadMerge.ll
llvm-svn: 53240
2008-07-08 17:18:32 +00:00
38740a98b2
Make DenseMap's insert return a pair, to more closely resemble std::map.
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llvm-svn: 53177
2008-07-07 17:46:23 +00:00
9f1a4dc672
Fix missed optimization opportunity when analyzing cast of mul and select.
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llvm-svn: 53151
2008-07-05 21:19:34 +00:00
da3db11db3
- Re-apply 52748 and friends with fix. GetConstantStringInfo() returns an empty string for ConstantAggregateZero case which surprises selectiondag.
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- Correctly handle memcpy from constant string which is zero-initialized.
llvm-svn: 52891
2008-06-30 07:31:25 +00:00
a7c583d584
Revert (52748 and friends):
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Move GetConstantStringInfo to lib/Analysis. Remove
string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.
This unbreaks llvm-gcc bootstrap.
llvm-svn: 52884
2008-06-29 17:57:03 +00:00
d0ab9c47e6
Move GetConstantStringInfo to lib/Analysis. Remove
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string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.
llvm-svn: 52748
2008-06-26 00:31:12 +00:00
c9c81fb0df
Fix PR2488, a case where we deleted stack restores too aggressively.
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llvm-svn: 52702
2008-06-25 05:59:28 +00:00
d3449df326
Fix for PR2479: correctly optimize expressions like (a > 13) & (a ==
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15).
See also PR1800, which is about the signed case.
llvm-svn: 52608
2008-06-21 23:36:13 +00:00
f3ecd2d290
Fix PR2471, which is a bug involving an invalid promotion from a conditional load.
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llvm-svn: 52525
2008-06-20 05:12:56 +00:00
cd6fb1d0a8
Remove dead code causing a warning.
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llvm-svn: 52502
2008-06-19 18:00:44 +00:00
ed2250990a
Use Instruction::moveBefore instead of manipulating the instruction list
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directly.
llvm-svn: 52498
2008-06-19 17:47:47 +00:00
78119b4742
Fix the regressions on sext-misc.ll my patch yesterday caused.
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llvm-svn: 52466
2008-06-18 18:11:55 +00:00
ef36dcd10b
implement some simple bswap optimizations, rdar://5992453
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llvm-svn: 52442
2008-06-18 04:33:20 +00:00
Nick Lewycky