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1597 Commits

Author SHA1 Message Date
Zhou Sheng d8c645b0ba ShiftAmt might equal to zero. Handle this situation. 
llvm-svn: 35094
 2007-03-14 09:07:33 +00:00
Zhou Sheng b912844554 Enable KnownZero/One.clear(). 
llvm-svn: 35093
 2007-03-14 03:21:24 +00:00
Evan Cheng b5eb932c93 Correct type info for isLegalAddressImmediate() check. 
llvm-svn: 35086
 2007-03-13 20:34:37 +00:00
Chris Lattner d1bce956b4 ifdef out some dead code. 
Fix PR1244 and Transforms/InstCombine/2007-03-13-CompareMerge.ll

llvm-svn: 35082
 2007-03-13 14:27:42 +00:00
Zhou Sheng ebe634e662 For expression like 
"APInt::getAllOnesValue(ShiftAmt).zextOrCopy(BitWidth)",
to handle ShiftAmt == BitWidth situation, use zextOrCopy() instead of
zext().

llvm-svn: 35080
 2007-03-13 06:40:59 +00:00
Zhou Sheng af4341d441 In APInt version ComputeMaskedBits(): 
1. Ensure VTy, KnownOne and KnownZero have same bitwidth.
  2. Make code more efficient.

llvm-svn: 35078
 2007-03-13 02:23:10 +00:00
Evan Cheng 720acdfb31 Use new TargetLowering addressing modes hooks. 
llvm-svn: 35072
 2007-03-12 23:27:37 +00:00
Reid Spencer 1791f23803 Add an APInt version of SimplifyDemandedBits. 
Patch by Zhou Sheng.

llvm-svn: 35064
 2007-03-12 17:25:59 +00:00
Reid Spencer d9281784be Add an APInt version of ShrinkDemandedConstant. 
Patch by Zhou Sheng.

llvm-svn: 35063
 2007-03-12 17:15:10 +00:00
Zhou Sheng be171ee5cd Avoid to assert on "(KnownZero & KnownOne) == 0". 
llvm-svn: 35062
 2007-03-12 16:54:56 +00:00
Zhou Sheng b3e00c4656 In function ComputeMaskedBits(): 
1. Replace getSignedMinValue() with getSignBit() for better code readability.
  2. Replace APIntOps::shl() with operator<<= for convenience.
  3. Make APInt construction more effective.

llvm-svn: 35060
 2007-03-12 05:44:52 +00:00
Nick Lewycky d9bd0bc3e2 Add value ranges. Currently inefficient in both execution time and 
optimization power.

llvm-svn: 35058
 2007-03-10 18:12:48 +00:00
Devang Patel 58818c530f Increment iterator now because IVUseShouldUsePostIncValue may remove 
User from the list of I users.

llvm-svn: 35051
 2007-03-09 21:19:53 +00:00
Zhou Sheng d1eb3d593e Fix a bug in function ComputeMaskedBits(). 
llvm-svn: 35027
 2007-03-08 15:15:18 +00:00
Chris Lattner abd3bff4f2 This appears correct, enable it so we can see perf changes on testers 
llvm-svn: 35024
 2007-03-08 07:03:55 +00:00
Chris Lattner 9f022d550b Second half of PR1226. This is currently still disabled, until I have a chance to 
do the correctness/performance analysis testing.

llvm-svn: 35023
 2007-03-08 06:36:54 +00:00
Zhou Sheng 387d7b1a35 Fix a bug in APIntified ComputeMaskedBits(). 
llvm-svn: 35022
 2007-03-08 05:42:00 +00:00
Reid Spencer bb5741fb02 For PR1205: 
Provide an APIntified version of MaskedValueIsZero. This will (temporarily)
cause a "defined but not used" message from the compiler. It will be used
in the next patch in this series.

Patch by Sheng Zhou.

llvm-svn: 35019
 2007-03-08 01:52:58 +00:00
Reid Spencer aa69640b10 For PR1205: 
Add a new ComputeMaskedBits function that is APIntified. We'll slowly
convert things over to use this version. When its all done, we'll remove
the existing version.

llvm-svn: 35018
 2007-03-08 01:46:38 +00:00
Devang Patel 2ac57e1f02 Now IndVarSimplify is a LoopPass. 
llvm-svn: 35003
 2007-03-07 06:39:01 +00:00
Devang Patel 69730c96db Now LICM is a LoopPass. 
llvm-svn: 35001
 2007-03-07 04:41:30 +00:00
Devang Patel 9779e56c04 Now LoopUnroll is a LoopPass. 
llvm-svn: 34996
 2007-03-07 01:38:05 +00:00
Devang Patel 901a27d892 Now LoopUnswitch is a LoopPass. 
llvm-svn: 34992
 2007-03-07 00:26:10 +00:00
Devang Patel b0743b5d6a Now LoopStrengthReduce is a LoopPass. 
llvm-svn: 34984
 2007-03-06 21:14:09 +00:00
Reid Spencer 3939b1a274 Remove an unnecessary if statement and adjust indentation. 
llvm-svn: 34939
 2007-03-05 23:36:13 +00:00
Chris Lattner 66e6a8229a This is the first major step of implementing PR1226. We now successfully 
scalarrepl things down to elements, but mem2reg can't promote elements that
are memset/memcpy'd.  Until then, the code is disabled "0 &&".

llvm-svn: 34924
 2007-03-05 07:52:57 +00:00
Chris Lattner fe53cf2459 fix a subtle bug that caused an MSVC warning. Thanks to Jeffc for pointing this out. 
llvm-svn: 34920
 2007-03-05 00:11:19 +00:00
Chris Lattner 5fdded1d2f Add some simplifications for demanded bits, this allows instcombine to turn: 
define i64 @test(i64 %A, i32 %B) {
        %tmp12 = zext i32 %B to i64             ; <i64> [#uses=1]
        %tmp3 = shl i64 %tmp12, 32              ; <i64> [#uses=1]
        %tmp5 = add i64 %tmp3, %A               ; <i64> [#uses=1]
        %tmp6 = and i64 %tmp5, 123              ; <i64> [#uses=1]
        ret i64 %tmp6
}

into:

define i64 @test(i64 %A, i32 %B) {
        %tmp6 = and i64 %A, 123         ; <i64> [#uses=1]
        ret i64 %tmp6
}

This implements Transforms/InstCombine/add2.ll:test1

llvm-svn: 34919
 2007-03-05 00:02:29 +00:00
Jeff Cohen b622c11f77 Unbreak VC++ build. 
llvm-svn: 34917
 2007-03-05 00:00:42 +00:00
Chris Lattner ab2f913b68 simplify some code 
llvm-svn: 34914
 2007-03-04 23:16:36 +00:00
Chris Lattner c33fd469ef minor cleanups 
llvm-svn: 34904
 2007-03-04 04:50:21 +00:00
Chris Lattner 8258b44b22 Speed up -instcombine by 20% by avoiding a particularly expensive passmgr call. 
llvm-svn: 34902
 2007-03-04 04:27:24 +00:00
Chris Lattner a5403a587c switch MarkAliveBlocks over to using SmallPtrSet instead of std::set, speeding 
up simplifycfg by 20%

llvm-svn: 34901
 2007-03-04 04:20:48 +00:00
Chris Lattner d7b4c92cd0 make better use of LCSSA information in RewriteLoopExitValues. Before, we 
would scan the entire loop body, then scan all users of instructions in the
loop, looking for users outside the loop.  Now, since we know that the
loop is in LCSSA form, we know that any users outside the loop will be LCSSA
phi nodes.  Just scan them.

This speeds up indvars significantly.

llvm-svn: 34898
 2007-03-04 03:43:23 +00:00
Chris Lattner 1f7648efba Implement PR1179/PR1232 and test/Transforms/IndVarsSimplify/loop_evaluate_[234].ll 
This makes -indvars require and use LCSSA, updating it as appropriate.

llvm-svn: 34896
 2007-03-04 01:00:28 +00:00
Chris Lattner ed30abf0cb Make RewriteLoopExitValues far less nested by using continue in the loop 
llvm-svn: 34891
 2007-03-03 22:48:48 +00:00
Chris Lattner da1d04a057 my recent change caused a failure in a bswap testcase, because it changed 
the order that instcombine processed instructions in the testcase.  The end
result is that instcombine finished with:

define i16 @test1(i16 %a) {
        %tmp = zext i16 %a to i32               ; <i32> [#uses=2]
        %tmp21 = lshr i32 %tmp, 8               ; <i32> [#uses=1]
        %tmp5 = shl i32 %tmp, 8         ; <i32> [#uses=1]
        %tmp.upgrd.32 = or i32 %tmp21, %tmp5            ; <i32> [#uses=1]
        %tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16           ; <i16> [#uses=1]
        ret i16 %tmp.upgrd.3
}

which can't get matched as a bswap.

This patch makes instcombine more sophisticated about removing truncating
casts, allowing it to turn this into:

define i16 @test2(i16 %a) {
        %tmp211 = lshr i16 %a, 8
        %tmp52 = shl i16 %a, 8
        %tmp.upgrd.323 = or i16 %tmp211, %tmp52
        ret i16 %tmp.upgrd.323
}

which then matches as bswap.  This fixes bswap.ll and implements
InstCombine/cast2.ll:test[12].  This also implements cast elimination of
add/sub.

llvm-svn: 34870
 2007-03-03 05:27:34 +00:00
Nick Lewycky db42295ff2 Translate bit operations to English. 
llvm-svn: 34868
 2007-03-03 03:14:40 +00:00
Chris Lattner 960a543037 add a top-level iteration loop to instcombine. This means that it will never 
finish without combining something it is capable of.

llvm-svn: 34865
 2007-03-03 02:04:50 +00:00
Reid Spencer c34dedf686 APIntify this pass. 
llvm-svn: 34863
 2007-03-03 00:48:31 +00:00
Reid Spencer 53a3739c80 Finally get this patch right :) 
Replace expensive getZExtValue() == 0 calls with isZero() calls.

llvm-svn: 34861
 2007-03-02 23:51:25 +00:00
Reid Spencer ba547cbb2a Dang, I've done that twice now! Undo previous commit. 
llvm-svn: 34860
 2007-03-02 23:37:53 +00:00
Reid Spencer 558990e189 Use more efficient test for one value in a ConstantInt. 
llvm-svn: 34859
 2007-03-02 23:35:28 +00:00
Reid Spencer 29fe20a98b Guard against huge loop trip counts in an APInt safe way. 
llvm-svn: 34858
 2007-03-02 23:31:34 +00:00
Chris Lattner b15e2b182f Fix a significant algorithm problem with the instcombine worklist. removing 
a value from the worklist required scanning the entire worklist to remove all
entries.  We now use a combination map+vector to prevent duplicates from
happening and prevent the scan.  This speeds up instcombine on a large file
from the llvm-gcc bootstrap from 189.7s to 4.84s in a debug build and from
5.04s to 1.37s in a release build.

llvm-svn: 34848
 2007-03-02 21:28:56 +00:00
Chris Lattner 51f5457ad4 minor cleanup 
llvm-svn: 34846
 2007-03-02 19:59:19 +00:00
Reid Spencer 197adfaa0a Reverse a premature commital. 
llvm-svn: 34822
 2007-03-02 00:31:39 +00:00
Reid Spencer 2e54a15943 Prefer non-virtual calls to ConstantInt::isZero over virtual calls to 
Constant::isNullValue() in situations where it is possible.

llvm-svn: 34821
 2007-03-02 00:28:52 +00:00
Reid Spencer fa63226751 Although probably not necessary, guard against a potential assertion by 
using isNullValue() instead of getZExtValue() == 0.

llvm-svn: 34815
 2007-03-01 21:54:37 +00:00
Reid Spencer 17797076ef Use isUnitValue() instead of getZExtValue() == 1 which will prevent an 
assert if the ConstantInt's value is large.

llvm-svn: 34814
 2007-03-01 21:51:23 +00:00