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Author SHA1 Message Date
Evan Cheng 240c1adade At end of LSR, replace uses of now constant (as result of SplitCriticalEdge) PHI node with the constant value. 
llvm-svn: 43533
 2007-10-30 23:45:15 +00:00
Evan Cheng c2dbfee43f It's not safe to tell SplitCriticalEdge to merge identical edges. It may delete the phi instruction that's being processed. 
llvm-svn: 43524
 2007-10-30 22:27:26 +00:00
Evan Cheng b024c4c81d - Bug fixes. 
- Allow icmp rewrite using an iv / stride of a smaller integer type.

llvm-svn: 43480
 2007-10-29 22:07:18 +00:00
Dan Gohman 2aec186dd0 Don't bitcast from pointer-to-vector to pointer-to-array when 
lowering load and store instructions.

llvm-svn: 43468
 2007-10-29 20:34:35 +00:00
Dan Gohman 3bcd5fe9f1 Use an array instead of a fixed-length std::vector. 
llvm-svn: 43467
 2007-10-29 20:24:00 +00:00
Dan Gohman d9911e21df Do a real assert if there is an unhandled vector instruction instead 
of just printing to cerr.

llvm-svn: 43466
 2007-10-29 20:14:29 +00:00
Dan Gohman 7414e21ec0 Update a comment to reflect the current code. 
llvm-svn: 43463
 2007-10-29 19:32:39 +00:00
Dan Gohman f5feb01056 Remove an unused function argument. 
llvm-svn: 43462
 2007-10-29 19:31:25 +00:00
Dan Gohman 50d42224d0 Fix a typo in a comment. 
llvm-svn: 43461
 2007-10-29 19:26:14 +00:00
Dan Gohman 8e8adada83 Avoid calling ValidStride when not all uses are addresses. 
llvm-svn: 43460
 2007-10-29 19:23:53 +00:00
Chris Lattner 4a15e04aee Fix PR1752 and LoopSimplify/2007-10-28-InvokeCrash.ll: terminators 
can have uses too.  Wouldn't it be nice if invoke didn't exist? :)

llvm-svn: 43426
 2007-10-29 02:30:37 +00:00
Evan Cheng 9dbe99dcd6 A number of LSR fixes: 
- ChangeCompareStride only reuse stride that is larger than current stride. It
  will let the general reuse mechanism to try to reuse a smaller stride.
- Watch out for multiplication overflow in ChangeCompareStride.
- Replace std::set with SmallPtrSet.

llvm-svn: 43408
 2007-10-26 23:08:19 +00:00
Evan Cheng d78a3e5555 Fix a crash. Make sure TLI is not null. 
llvm-svn: 43384
 2007-10-26 17:24:46 +00:00
Gordon Henriksen 78c63ac41e More fleshing out of docs/Passes.html, plus some typo fixes and 
improved wording in source files.

llvm-svn: 43377
 2007-10-26 03:03:51 +00:00
Evan Cheng 7f3d02471d Loosen up iv reuse to allow reuse of the same stride but a larger type when truncating from the larger type to smaller type is free. 
e.g.
Turns this loop:
LBB1_1: # entry.bb_crit_edge
        xorl    %ecx, %ecx
        xorw    %dx, %dx
        movw    %dx, %si
LBB1_2: # bb
        movl    L_X$non_lazy_ptr, %edi
        movw    %si, (%edi)
        movl    L_Y$non_lazy_ptr, %edi
        movw    %dx, (%edi)
		addw    $4, %dx
		incw    %si
		incl    %ecx
		cmpl    %eax, %ecx
		jne     LBB1_2  # bb
	
into

LBB1_1: # entry.bb_crit_edge
        xorl    %ecx, %ecx
        xorw    %dx, %dx
LBB1_2: # bb
        movl    L_X$non_lazy_ptr, %esi
        movw    %cx, (%esi)
        movl    L_Y$non_lazy_ptr, %esi
        movw    %dx, (%esi)
        addw    $4, %dx
		incl    %ecx
        cmpl    %eax, %ecx
        jne     LBB1_2  # bb

llvm-svn: 43375
 2007-10-26 01:56:11 +00:00
Evan Cheng 29e29e63bd Do not rewrite compare instruction using iv of a different stride if the new 
stride may be rewritten using the stride of the compare instruction.

llvm-svn: 43367
 2007-10-25 22:45:20 +00:00
Evan Cheng 5a38108374 Remove code that's commented out. 
llvm-svn: 43356
 2007-10-25 18:38:24 +00:00
Evan Cheng 133694db06 If a loop termination compare instruction is the only use of its stride, 
and the compaison is against a constant value, try eliminate the stride
by moving the compare instruction to another stride and change its
constant operand accordingly. e.g.

loop:
...
v1 = v1 + 3
v2 = v2 + 1
if (v2 < 10) goto loop
=>
loop:
...
v1 = v1 + 3
if (v1 < 30) goto loop

llvm-svn: 43336
 2007-10-25 09:11:16 +00:00
Dale Johannesen 4d06391c47 Fix off by 1 bug in printf->puts lowering. 
llvm-svn: 43309
 2007-10-24 20:14:50 +00:00
Chris Lattner 55b8302dfe simplify some code by using the new isNaN predicate 
llvm-svn: 43305
 2007-10-24 18:54:45 +00:00
Chris Lattner c62877e9da Implement a couple of foldings for ordered and unordered comparisons, 
implementing cases related to PR1738.

llvm-svn: 43289
 2007-10-24 05:38:08 +00:00
Dan Gohman e0c3d9f338 Strength reduction improvements. 
- Avoid attempting stride-reuse in the case that there are users that
   aren't addresses. In that case, there will be places where the
   multiplications won't be folded away, so it's better to try to
   strength-reduce them.

 - Several SSE intrinsics have operands that strength-reduction can
   treat as addresses. The previous item makes this more visible, as
   any non-address use of an IV can inhibit stride-reuse.

 - Make ValidStride aware of whether there's likely to be a base
   register in the address computation. This prevents it from thinking
   that things like stride 9 are valid on x86 when the base register is
   already occupied.

Also, XFAIL the 2007-08-10-LEA16Use32.ll test; the new logic to avoid
stride-reuse elimintes the LEA in the loop, so the test is no longer
testing what it was intended to test.

llvm-svn: 43231
 2007-10-22 20:40:42 +00:00
Dan Gohman a37eaf2bf9 Move the SCEV object factors from being static members of the individual 
SCEV subclasses to being non-static member functions of the ScalarEvolution
class.

llvm-svn: 43224
 2007-10-22 18:31:58 +00:00
Anton Korobeynikov 7499a3b092 Reg2Mem cleanup and optimizations: 
- enable phi instructions demotion to stack
 - create alloca instructions in the entry block

llvm-svn: 43208
 2007-10-21 23:05:16 +00:00
Devang Patel df49cf52e2 Try again. 
Instead of loading small global string from memory, use
integer constant.

llvm-svn: 43148
 2007-10-18 19:52:32 +00:00
Owen Anderson 09b83ba6f1 Allow GVN to eliminate redundant calls to functions without side effects. 
llvm-svn: 43147
 2007-10-18 19:39:33 +00:00
Chris Lattner 9715d9fb59 Fix PR1735 and Transforms/DeadArgElim/2007-10-18-VarargsReturn.ll by 
fixing some obviously broken code :(

llvm-svn: 43141
 2007-10-18 18:49:29 +00:00
Owen Anderson ca831a829d Move Split<...>() into DomTreeBase. This should make the #include's of DominatorInternals.h 
in CodeExtractor and LoopSimplify unnecessary.

Hartmut, could you confirm that this fixes the issues you were seeing?

llvm-svn: 43115
 2007-10-18 05:13:52 +00:00
Evan Cheng cdcc1d0444 Reverting r43070 for now. It's causing llc test failures. 
llvm-svn: 43103
 2007-10-17 23:51:13 +00:00
Devang Patel b3dac3f5d9 Do not raise free() call that is called through invoke instruction. 
llvm-svn: 43083
 2007-10-17 20:12:58 +00:00
Hartmut Kaiser 2f842e613f Fixed linker errors (unresolved externals: split<>(...)) when compiling with VC++. Please review. 
llvm-svn: 43081
 2007-10-17 18:37:09 +00:00
Devang Patel 91ff13edcc Apply "Instead of loading small c string constant, use integer constant directly" transformation while processing load instruction. 
llvm-svn: 43070
 2007-10-17 07:24:40 +00:00
Devang Patel 8d818f5e80 Use immediate stores. 
llvm-svn: 43055
 2007-10-16 23:44:18 +00:00
Devang Patel bff4aea328 Achieve same result but use fewer lines of code. 
llvm-svn: 42985
 2007-10-15 15:31:35 +00:00
Devang Patel 371e6ca690 Dest type is always i8 *. This allows some simplification. 
Do not filter memmove.

llvm-svn: 42930
 2007-10-12 20:10:21 +00:00
Chris Lattner ad618f66e6 Fix a bug in my patch last night that broke InstCombine/2007-10-12-Crash.ll 
llvm-svn: 42920
 2007-10-12 18:05:47 +00:00
Gabor Greif 5d8f7e0cc7 eliminate warning 
llvm-svn: 42892
 2007-10-12 07:44:54 +00:00
Chris Lattner d8675e4915 Fix some 80 column violations. 
Fix DecomposeSimpleLinearExpr to handle simple constants better.
Don't nuke gep(bitcast(allocation)) if the bitcast(allocation) will
fold the allocation.  This fixes PR1728 and Instcombine/malloc3.ll

llvm-svn: 42891
 2007-10-12 05:30:59 +00:00
Devang Patel 899cc56612 Lower memcpy if it makes sense. 
llvm-svn: 42864
 2007-10-11 17:21:57 +00:00
Devang Patel 2af23f976b Do not walk invalid iterator. 
llvm-svn: 42812
 2007-10-09 21:31:36 +00:00
Devang Patel a69f987b66 Fix bug in updating dominance frontier after loop 
unswitch when frontier includes basic blocks that 
are not inside loop.

llvm-svn: 42654
 2007-10-05 22:29:34 +00:00
Devang Patel 3574759d85 Fix 80 col violation. 
llvm-svn: 42591
 2007-10-03 21:17:43 +00:00
Devang Patel e192e32577 Refactor code in a separate method. 
llvm-svn: 42590
 2007-10-03 21:16:08 +00:00
Dan Gohman c731c97fac Use empty() member functions when that's what's being tested for instead 
of comparing begin() and end().

llvm-svn: 42585
 2007-10-03 19:26:29 +00:00
Dale Johannesen 9d559cfff5 Tone down an overzealous optimization. 
llvm-svn: 42582
 2007-10-03 17:45:27 +00:00
Tanya Lattner 30f65fe4a7 Fix PR1719, by not marking llvm.global.annotations internal. 
llvm-svn: 42578
 2007-10-03 17:05:40 +00:00
Chris Lattner d66e0cd6c0 Fix PR1719, by not marking llvm.noinline internal. 
llvm-svn: 42565
 2007-10-03 03:59:15 +00:00
Dale Johannesen b6c05b1f90 Fix stride computations for long double arrays. 
llvm-svn: 42508
 2007-10-01 23:08:35 +00:00
Devang Patel 2a60ff1aeb Relax unsafe use check. If there is one unconditional use inside the loop then it is safe to promote value even if there is another conditional use inside the loop. 
llvm-svn: 42493
 2007-10-01 18:12:58 +00:00
Dale Johannesen 6bf69ed3cc minor long double related changes 
llvm-svn: 42439
 2007-09-28 18:06:58 +00:00
Dale Johannesen 1d1d0e7735 Don't do SRA for unions with long double fields. 
Fixes a SWB crash.

llvm-svn: 42422
 2007-09-28 00:21:38 +00:00
Devang Patel 7bba386f72 Handle multiple induction variables. 
This fixes PR714.

llvm-svn: 42309
 2007-09-25 18:24:48 +00:00
Devang Patel 440d13b55b Do not reserve DOM check for GetElementPtrInst. 
llvm-svn: 42306
 2007-09-25 17:55:50 +00:00
Devang Patel 5e1651d270 doh.. 
llvm-svn: 42300
 2007-09-25 17:43:08 +00:00
Devang Patel 87d7e8ebcb Add transformation to update loop interation space. Now, 
for (i=A; i<N; i++) {
  if (i < X && i > Y)
    do_something();
}

is transformed into

U=min(N,X); L=max(A,Y);
for (i=L;i<U;i++)
  do_somethihg();                            

llvm-svn: 42299
 2007-09-25 17:31:19 +00:00
Devang Patel 9e30e1a3be Do not promote null values because it may be unsafe to do so. 
llvm-svn: 42270
 2007-09-24 20:02:42 +00:00
Dan Gohman 75470c3bf1 explicit keywords. 
llvm-svn: 42262
 2007-09-24 15:48:49 +00:00
Devang Patel 361e52f39c Fix PR1692 
llvm-svn: 42209
 2007-09-21 21:18:19 +00:00
Owen Anderson 46da2a6262 Add partial caching of non-local memory dependence queries. This provides a modest 
speedup for GVN.

llvm-svn: 42185
 2007-09-21 03:53:52 +00:00
Devang Patel 83cc3f8f51 Update aux. info associated with an instruction before erasing instruction. 
llvm-svn: 42180
 2007-09-20 23:45:50 +00:00
Devang Patel 6117a3b696 Don't increment invalid iterator. 
llvm-svn: 42178
 2007-09-20 23:01:50 +00:00
Nick Lewycky eae7e7d00b Fix optimization. %x = sub %x, %y does not imply that %y is zero. 
llvm-svn: 42157
 2007-09-20 00:48:36 +00:00
Devang Patel 464276f831 Avoid unsafe promotion. 
llvm-svn: 42149
 2007-09-19 20:18:51 +00:00
Duncan Sands d31649bc59 Improve comment. 
llvm-svn: 42132
 2007-09-19 10:25:38 +00:00
Duncan Sands 56df7dec2b A global variable with external weak linkage can be null, while 
an alias could alias such a global variable.

llvm-svn: 42130
 2007-09-19 10:10:31 +00:00
Devang Patel 69a55a38ed Relax loop ExitCondition predicate restriction. 
llvm-svn: 42122
 2007-09-19 00:28:47 +00:00
Devang Patel 455a53b7db Filter loops where split condition's false branch is not empty. For example 
for (int i = 0; i < N; ++i) {
  if (i == somevalue)
    dosomething();
   else
    dosomethingelse();
}

llvm-svn: 42121
 2007-09-19 00:15:16 +00:00
Devang Patel 4c238c451f Bail out early, before modifying anything. 
llvm-svn: 42120
 2007-09-19 00:11:01 +00:00
Devang Patel 31f2c8592c Work is incomplete. Loop is not modified at all right now. 
llvm-svn: 42119
 2007-09-19 00:08:13 +00:00
Devang Patel fcda998ab2 Fix PR1657 
llvm-svn: 42075
 2007-09-18 01:54:42 +00:00
Devang Patel 267c07b51f Do not eliminate loop when it is invalid to do so. For example, 
for(int i = 0; i < N; i++) {
	if ( i == XYZ) {
		A;
	else
		B;
	}
	C;
	D;
}

llvm-svn: 42058
 2007-09-17 21:01:05 +00:00
Devang Patel 712dbe9d13 Skeleton for transformations to truncate loop's iteration space. 
llvm-svn: 42054
 2007-09-17 20:39:48 +00:00
Devang Patel 9d1af9b63d Fix comment. 
llvm-svn: 42048
 2007-09-17 20:07:40 +00:00
Chris Lattner 0625bd6472 Merge DenseMapKeyInfo & DenseMapValueInfo into DenseMapInfo 
Add a new DenseMapInfo::isEqual method to allow clients to redefine
the equality predicate used when probing the hash table.

llvm-svn: 42042
 2007-09-17 18:34:04 +00:00
Dan Gohman 2ac2652779 Instcombine x-((x/y)*y) into a remainder operator. 
llvm-svn: 42035
 2007-09-17 17:31:57 +00:00
Duncan Sands 6d5da71288 Factor the trampoline transformation into a subroutine. 
llvm-svn: 42021
 2007-09-17 10:26:40 +00:00
Owen Anderson 4cd516b50b Be more careful when constant-folding PHI nodes. 
llvm-svn: 41998
 2007-09-16 08:04:16 +00:00
Owen Anderson 8d0cb881e5 Remove RLE. It is subsumed by GVN. 
llvm-svn: 41968
 2007-09-14 22:33:52 +00:00
Dale Johannesen 98d3a08d8f Remove the assumption that FP's are either float or 
double from some of the many places in the optimizers
it appears, and do something reasonable with x86
long double.
Make APInt::dump() public, remove newline, use it to
dump ConstantSDNode's.
Allow APFloats in FoldingSet.
Expand X86 backend handling of long doubles (conversions
to/from int, mostly).

llvm-svn: 41967
 2007-09-14 22:26:36 +00:00
Chris Lattner 5d13fb538f Fix a logic error in ValueIsOnlyUsedLocallyOrStoredToOneGlobal that caused 
miscompilation of 188.ammp.  Reject select and bitcast in 
ValueIsOnlyUsedLocallyOrStoredToOneGlobal because RewriteHeapSROALoadUser can't handle it.

llvm-svn: 41950
 2007-09-14 03:41:21 +00:00
Chris Lattner d9111b88d1 silence a bogus gcc warning. 
llvm-svn: 41949
 2007-09-14 03:07:24 +00:00
Bill Wendling 264d4813c7 Temporary reverting r41817 
(http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20070910/053370.html). It's
causing SPASS to fail.

llvm-svn: 41938
 2007-09-14 01:13:55 +00:00
Chris Lattner 011f91b5b2 Teach GlobalLoadUsesSimpleEnoughForHeapSRA and the SROA rewriter how to handle 
a limited form of PHI nodes.  This finally fixes PR1639, speeding 179.art up
from 7.84s to 3.13s on PPC.

llvm-svn: 41933
 2007-09-13 21:31:36 +00:00
Chris Lattner ba98f89388 be tolerant of PHI nodes when rewriting heap SROA code. This is a step 
along the way of PR1639

llvm-svn: 41930
 2007-09-13 18:00:31 +00:00
Chris Lattner f315d4f1a7 refactor some code, no functionality change. On the path to PR1639 
llvm-svn: 41929
 2007-09-13 17:29:05 +00:00
Chris Lattner 6eed0e7366 Make ValueIsOnlyUsedLocallyOrStoredToOneGlobal smart enough to see through 
bitcasts and phis.  This is a step to fixing PR1639.

llvm-svn: 41928
 2007-09-13 16:37:20 +00:00
Chris Lattner 2d2892ee6e Make AllUsesOfLoadedValueWillTrapIfNull strong enough to see through PHI 
nodes.  This is the first step of the fix for PR1639.

llvm-svn: 41927
 2007-09-13 16:30:19 +00:00
Chris Lattner 7b412cb823 Change llvm.gcroot to not init the root to null at runtime, this prevents 
using it for live-in values etc.

llvm-svn: 41879
 2007-09-12 17:53:10 +00:00
Duncan Sands 9204663bcb Turn calls to trampolines into calls to the underlying 
nested function.

llvm-svn: 41844
 2007-09-11 14:35:41 +00:00
Devang Patel 7ed6eb8992 Avoid negative logic. 
llvm-svn: 41829
 2007-09-11 01:10:45 +00:00
Devang Patel 8c95373ced Refactor code into a separate method. 
llvm-svn: 41826
 2007-09-11 00:42:56 +00:00
Devang Patel d67479b6ee Clear split info object. 
llvm-svn: 41823
 2007-09-11 00:23:56 +00:00
Devang Patel a28a7f1b2d Split condition does not have to be ICmpInst in all cases. 
llvm-svn: 41822
 2007-09-11 00:12:56 +00:00
Devang Patel f4202e91f8 Check all terminators inside loop. 
llvm-svn: 41821
 2007-09-10 23:57:58 +00:00
Chris Lattner e804567cd8 remove some dead code, this is handled by constant folding. 
llvm-svn: 41819
 2007-09-10 23:46:29 +00:00
Devang Patel 2181b8e86a Swap exit condition operands if it works. 
llvm-svn: 41817
 2007-09-10 23:34:06 +00:00
Chris Lattner c75cbe6473 Prevent tailcallelim from breaking "recursive" calls to builtins. 
llvm-svn: 41804
 2007-09-10 20:58:55 +00:00
Devang Patel f8ab0a9acc Filter exit conditions which are not yet handled. 
llvm-svn: 41800
 2007-09-10 18:33:42 +00:00
Devang Patel d7409fdce5 Require SCEV before LCSSA. 
llvm-svn: 41798
 2007-09-10 18:08:23 +00:00
Chris Lattner 85a51e0060 Don't zap back to back volatile load/stores 
llvm-svn: 41759
 2007-09-07 05:33:03 +00:00
Dale Johannesen bed9dc423c Next round of APFloat changes. 
Use APFloat in UpgradeParser and AsmParser.
Change all references to ConstantFP to use the
APFloat interface rather than double.  Remove
the ConstantFP double interfaces.
Use APFloat functions for constant folding arithmetic
and comparisons.
(There are still way too many places APFloat is
just a wrapper around host float/double, but we're
getting there.)

llvm-svn: 41747
 2007-09-06 18:13:44 +00:00
Nick Lewycky 0c5c47944a Use isTrueWhenEqual. Thanks Chris! 
llvm-svn: 41741
 2007-09-06 02:40:25 +00:00
Nick Lewycky b0b066eaaa When the two operands of an icmp are equal, there are five possible predicates 
that would make the icmp true. Fixes PR1637.

llvm-svn: 41740
 2007-09-06 01:10:22 +00:00
Chuck Rose III 2320323647 Forgot to obey 80 column rule. Fixing that. 
llvm-svn: 41725
 2007-09-05 20:36:41 +00:00
Chuck Rose III e58572233d Added default parameters to GetElementPtrInstr constructor call. Visual Studio 2k5 was getting confused and was unable to compile it. Suspected compiler error. 
llvm-svn: 41721
 2007-09-05 16:54:38 +00:00
Devang Patel f6ef552f3d Insert cloned loop basic blocks before original loop header. 
llvm-svn: 41713
 2007-09-04 20:46:35 +00:00
David Greene c656cbb8c2 Update GEP constructors to use an iterator interface to fix 
GLIBCXX_DEBUG issues.

llvm-svn: 41697
 2007-09-04 15:46:09 +00:00
Anton Korobeynikov 35322d745c Silence warning while compiling with gcc 4.2 
llvm-svn: 41676
 2007-09-02 22:11:14 +00:00
Evan Cheng ffac17a223 Fix a gcroot lowering bug. 
llvm-svn: 41668
 2007-09-01 02:00:51 +00:00
Chris Lattner 0e258b8518 Cut off crazy computation. This helps PR1622 slightly. 
llvm-svn: 41522
 2007-08-28 04:23:55 +00:00
Devang Patel d2456a171d Use simpler test to filter loops. 
llvm-svn: 41516
 2007-08-27 21:34:31 +00:00
David Greene 703623d571 Update InvokeInst to work like CallInst 
llvm-svn: 41506
 2007-08-27 19:04:21 +00:00
Dan Gohman 71eaf62e5f Change comments to refer to @malloc and @free instead of %malloc and %free. 
llvm-svn: 41488
 2007-08-27 16:11:48 +00:00
Anton Korobeynikov 24fb6b2f8c Don't promote volatile loads/stores. This is needed (for example) to handle setjmp/longjmp properly. 
This fixes PR1520.

llvm-svn: 41461
 2007-08-26 21:43:30 +00:00
Owen Anderson 2b9ec7ff33 Don't DSe volatile stores. 
llvm-svn: 41456
 2007-08-26 21:14:47 +00:00
Devang Patel 6114751544 Move exit condition and exit branch from exiting block into loop header and dominator info. This avoid execution of dead iteration. Loop is already filter in the beginning such that this change is safe. 
llvm-svn: 41394
 2007-08-25 02:39:24 +00:00
Devang Patel c1ef32ef3d Constant split values needs upper bound and lower bound check, just like any other split value. 
llvm-svn: 41389
 2007-08-25 01:09:14 +00:00
Devang Patel 4e63e1f5b5 While calculating upper loop bound for first loop and lower loop bound for second loop, take care of edge cases. 
llvm-svn: 41387
 2007-08-25 00:56:38 +00:00
Devang Patel f5a01bf025 Fix regression that I caused yesterday night while adding logic to select appropriate split condition branch. 
llvm-svn: 41365
 2007-08-24 19:32:26 +00:00
Devang Patel 4bc9298f2a It is not safe to execute split condition's true branch first all the time. If split 
condition predicate is GT or GE then execute false branch first.

llvm-svn: 41358
 2007-08-24 06:17:19 +00:00
Devang Patel 4be56a5d12 Reject ICMP_NE as index split condition. 
llvm-svn: 41357
 2007-08-24 06:02:25 +00:00
Devang Patel 5e46fac6de Tightenup loop filter. 
llvm-svn: 41356
 2007-08-24 05:36:56 +00:00
Devang Patel 504dc0aaed Remove incomplete cost analysis. 
llvm-svn: 41354
 2007-08-24 05:21:13 +00:00
Chris Lattner b0f158cfdf rename APInt::toString -> toStringUnsigned for symmetry with toStringSigned() 
Add an APSInt::toString() method.

llvm-svn: 41309
 2007-08-23 05:15:32 +00:00
Devang Patel 887db2d832 Remove dead code. 
llvm-svn: 41295
 2007-08-22 21:07:41 +00:00
Devang Patel 6f4f23320d Fix typo. 
llvm-svn: 41292
 2007-08-22 20:55:18 +00:00
Devang Patel 31206b56d5 Cosmetic change 
"True Loop" and "False Loop" naming terminology to refer two loops
after loop cloning is confusing. Instead just use A_Loop and B_Loop.

llvm-svn: 41287
 2007-08-22 19:33:29 +00:00
Devang Patel 90da534987 Refactor loop condition check in a separate function. 
llvm-svn: 41282
 2007-08-22 18:27:01 +00:00
Devang Patel cd8beb7645 Fix thinko. 
Starting value of second loop's induction variable can not be lower 
then starting value of original loop's induction variable.

llvm-svn: 41280
 2007-08-22 18:07:47 +00:00
Devang Patel a12000d572 Rename bunch of variables. 
llvm-svn: 41250
 2007-08-21 21:12:02 +00:00
Devang Patel f98db5e62a Preserve LCSSA. 
llvm-svn: 41246
 2007-08-21 19:47:46 +00:00
Devang Patel b5933bbbd5 Use SmallVector instead of std::vector. 
llvm-svn: 41207
 2007-08-21 00:31:24 +00:00
Devang Patel 8f4228d619 s/ExitBlock/ExitingBlock/g 
llvm-svn: 41204
 2007-08-20 23:51:18 +00:00
Devang Patel 49c4f9a889 Replace indunction variable with split value in loop body. 
This fixes art miscompile.

llvm-svn: 41195
 2007-08-20 20:49:01 +00:00
Devang Patel c2e2d15f45 Do not split loops rejected by processOneIterationLoop(). 
llvm-svn: 41194
 2007-08-20 20:24:15 +00:00
Nick Lewycky bfa9499a88 Oops, remove assert that wasn't meant to be committed. 
llvm-svn: 41170
 2007-08-18 23:21:28 +00:00
Nick Lewycky 5b5b1ab9e0 Never insert duplicate edges. 
llvm-svn: 41169
 2007-08-18 23:18:03 +00:00
Nick Lewycky a0d49dac26 Typo. 
llvm-svn: 41168
 2007-08-18 15:08:56 +00:00
Devang Patel 1282b6e181 Avoid spliting loops where two split condition branches are not independent. 
llvm-svn: 41148
 2007-08-18 00:00:32 +00:00
Devang Patel d1fcfcc76c When one branch of condition is eliminated then head of the other 
branch is not necessary immediate dominators of merge blcok in all cases.

llvm-svn: 41144
 2007-08-17 21:59:16 +00:00
Owen Anderson f5023a7a84 Factor out some code into a helper function. 
llvm-svn: 41131
 2007-08-16 22:51:56 +00:00
Owen Anderson 221a43604e Add some more comments to GVN. 
llvm-svn: 41129
 2007-08-16 22:02:55 +00:00
Devang Patel 3640e78057 Dominance frontier is now required. 
llvm-svn: 41096
 2007-08-15 03:34:53 +00:00
Devang Patel b81bcbde09 Cleanup removeBlocks. 
Use dominance frontier to fixup incoming edges of successor blocks not domianted by DeadBB.
Use df_iterator to walk and delete basic blocks dominated by DeadBB.

llvm-svn: 41095
 2007-08-15 03:31:47 +00:00
Reid Spencer 0db035567c Remove unneeded header file. 
llvm-svn: 41094
 2007-08-15 03:01:04 +00:00
Devang Patel f55b79fa71 Avoid triangle loops. 
llvm-svn: 41093
 2007-08-15 02:14:55 +00:00
Devang Patel 22c7993ecf Break infinite loop. 
llvm-svn: 41091
 2007-08-14 23:59:17 +00:00
Devang Patel 7cad917160 Avoid nested loops at the moment. 
llvm-svn: 41090
 2007-08-14 23:53:57 +00:00
Devang Patel 33ba97d747 Fix dominance frontier update while removing blocks. 
llvm-svn: 41082
 2007-08-14 18:35:57 +00:00
Owen Anderson bc271a02fd Eliminate PHI nodes with constant values during normal GVN processing, even when 
they're not related to eliminating a load.

llvm-svn: 41081
 2007-08-14 18:33:27 +00:00