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4213 Commits

Author SHA1 Message Date
Dan Gohman 6b733fc189 Minor code simplification. 
llvm-svn: 104232
 2010-05-20 16:23:28 +00:00
Dan Gohman 80a9608442 Move the code for deleting BaseRegs and LSRUses into helper functions, 
and fix a bug that valgrind noticed where the code would std::swap an
element with itself.

llvm-svn: 104225
 2010-05-20 15:17:54 +00:00
Dan Gohman 20fab456da Teach LSR how to cope better with unrolled loops on targets where 
the addressing modes don't make this trivially easy. This allows
it to avoid falling into the less precise heuristics in more
cases.

llvm-svn: 104186
 2010-05-19 23:43:12 +00:00
Dan Gohman beebef4137 Add a comment. 
llvm-svn: 104089
 2010-05-18 23:55:57 +00:00
Dan Gohman 50f8f2c23d Fix the predicate which checks for non-sensical formulae which have 
constants in registers which partially cancel out their immediate fields.

llvm-svn: 104088
 2010-05-18 23:48:08 +00:00
Dan Gohman 4cf99b5303 Factor out the code for recomputing an LSRUse's Regs set after some 
of its formulae have been removed into a helper function, and also
teach it how to update the RegUseTracker.

llvm-svn: 104087
 2010-05-18 23:42:37 +00:00
Dan Gohman a4eca05174 Factor out code for estimating search space complexity into a helper 
function.

llvm-svn: 104082
 2010-05-18 22:51:59 +00:00
Dan Gohman 63e9015248 Add some more debug output. 
llvm-svn: 104080
 2010-05-18 22:41:32 +00:00
Dan Gohman f1c7b1b42f Factor out the code for deleting a formula from an LSRUse into 
a helper function.

llvm-svn: 104079
 2010-05-18 22:39:15 +00:00
Dan Gohman 8aca7ef903 Make some debug output more informative. 
llvm-svn: 104078
 2010-05-18 22:37:37 +00:00
Dan Gohman 06ab08f795 Print an error message in Formula::print if the HasBaseReg flag 
is inconsistent with the BaseRegs field. It's not print's job to
assert on an invalid condition, but it can make one more obvious.

llvm-svn: 104077
 2010-05-18 22:35:55 +00:00
Dan Gohman 248c41d108 Rename RegUseTracker's RegUses member to RegUsesMap to avoid 
confusion with LSRInstance's RegUses member.

llvm-svn: 104076
 2010-05-18 22:33:00 +00:00
Douglas Gregor 6739a89117 Fixes for Microsoft Visual Studio 2010, from Steven Watanabe! 
llvm-svn: 103457
 2010-05-11 06:17:44 +00:00
Chris Lattner 84d4618659 make simplifycfg insert an llvm.trap before the 'unreachable' it introduces 
when it detects undefined behavior.  llvm.trap generally codegens into some
thing really small (e.g. a 2 byte ud2 instruction on x86) and debugging this
sort of thing is "nontrivial".  For example, we now compile:

void foo() { *(int*)0 = 42; }

into:

_foo:
	pushl	%ebp
	movl	%esp, %ebp
	ud2

Some may even claim that this is a security hole, though that seems dubious
to me.  This addresses rdar://7958343 - Optimizing away null dereference 
potentially allows arbitrary code execution

llvm-svn: 103356
 2010-05-08 22:15:59 +00:00
Chris Lattner 5a62d6e578 Fix PR7052, patch by Jakub Staszak! 
llvm-svn: 103347
 2010-05-08 20:01:44 +00:00
Dan Gohman d0800241d2 When pruning candidate formulae out of an LSRUse, update the 
LSRUse's Regs set after all pruning is done, rather than trying
to do it on the fly, which can produce an incomplete result.

This fixes a case where heuristic pruning was stripping all
formulae from a use, which led the solver to enter an infinite
loop.

Also, add a few asserts to diagnose this kind of situation.

llvm-svn: 103328
 2010-05-07 23:36:59 +00:00
Ted Kremenek d90773ebe0 Update CMake build. 
llvm-svn: 103266
 2010-05-07 17:13:20 +00:00
Dan Gohman 5d5b8b1b8c Add an LLVM IR version of code sinking. This uses the same simple algorithm 
as MachineSink, but it isn't constrained by MachineInstr-level details.

llvm-svn: 103257
 2010-05-07 15:40:13 +00:00
Bob Wilson 0c8b29bcdb Use the right version of "append" to combine two SmallVectors. 
This fixes the compile-time regressions seen in last night's tests.

llvm-svn: 103118
 2010-05-05 20:44:15 +00:00
Bob Wilson a2fda8b648 Defer adding critical edges to the "toSplit" list until after checking for 
indirect branches in all the predecessors.  This avoids unnecessarily
splitting edges in cases where load PRE is not possible anyway.
Thanks to Jakub Staszak for pointing this out.

llvm-svn: 103034
 2010-05-04 20:03:21 +00:00
Dan Gohman 1d2ded75e2 Use getConstant instead of getIntegerSCEV. The two are basically the 
same, now that getConstant has overloads consistent with ConstantInt::get.

llvm-svn: 102965
 2010-05-03 22:09:21 +00:00
Devang Patel 9f5200a122 Check for side effects before splitting loop. 
Patch by Jakub Staszak!

llvm-svn: 102928
 2010-05-03 18:06:58 +00:00
Chris Lattner 87aa2243e2 fix PR6940: sitofp(undef) folds to 0.0, not undef. 
llvm-svn: 102358
 2010-04-26 18:21:23 +00:00
Dan Gohman 534ba376f6 Generalize LSR's OptimizeMax to handle the new kinds of max expressions 
that indvars may use, now that indvars is recognizing le and ge loops.

llvm-svn: 102235
 2010-04-24 03:13:44 +00:00
Dan Gohman 997bbc54d6 Fix LSR to tolerate cases where ScalarEvolution initially 
misses an opportunity to fold add operands, but folds them
after LSR has separated them out. This fixes rdar://7886751.

llvm-svn: 102157
 2010-04-23 01:55:05 +00:00
Chris Lattner 4ba01ec869 refactor the interface to InlineFunction so that most of the in/out 
arguments are handled with a new InlineFunctionInfo class.  This 
makes it easier to extend InlineFunction to return more info in the
future.

llvm-svn: 102137
 2010-04-22 23:07:58 +00:00
Gabor Greif 27b3d55194 use abstract accessors to CallInst 
llvm-svn: 101899
 2010-04-20 13:13:04 +00:00
Chris Lattner 66e809acc0 remove a bunch of ad-hoc code to simplify instructions from 
loop unswitch, and use inst simplify instead.  It is more
powerful and less duplication.

llvm-svn: 101874
 2010-04-20 05:33:18 +00:00
Chris Lattner 5814d9d9da RewriteLoopBodyWithConditionConstant can end up rewriting the 
condition we're unswitching on.  In this case, don't try to
simplify the second copy of the loop which may be dead or not,
but is probably a constant now.  This fixes PR6879

llvm-svn: 101870
 2010-04-20 05:09:16 +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
Eric Christopher 7258dcd77f Revert 101465, it broke internal OpenGL testing. 
Probably the best way to know that all getOperand() calls have been handled
is to replace that API instead of updating.

llvm-svn: 101579
 2010-04-16 23:37:20 +00:00
Dan Gohman 99e5327bfd Refine the detection of seemingly infinitely recursive calls where the 
callee is expected to be expanded to something else by codegen, so that
normal infinitely recursive calls are still transformed.

llvm-svn: 101468
 2010-04-16 15:57:50 +00:00
Gabor Greif f375520f7b reapply r101434 
with a fix for self-hosting

rotate CallInst operands, i.e. move callee to the back
of the operand array

the motivation for this patch are laid out in my mail to llvm-commits:
more efficient access to operands and callee, faster callgraph-construction,
smaller compiler binary

llvm-svn: 101465
 2010-04-16 15:33:14 +00:00
Chris Lattner bd2d9430d6 fix comment noticed by Bob 
llvm-svn: 101437
 2010-04-16 02:32:17 +00:00
Gabor Greif 403e9694f9 back out r101423 and r101397, they break llvm-gcc self-host on darwin10 
llvm-svn: 101434
 2010-04-16 01:16:20 +00:00
Chris Lattner 1146d326a7 fix PR6832: we were using the alignment of a pointer when we 
wanted the alignment of the pointee.

llvm-svn: 101432
 2010-04-16 01:05:38 +00:00
Chris Lattner b73552908e improve comments. 
llvm-svn: 101429
 2010-04-16 00:38:19 +00:00
Chris Lattner 78d7dbbc30 pull all the ConvertToScalarInfo code together into one 
place.

llvm-svn: 101427
 2010-04-16 00:24:57 +00:00
Chris Lattner d69c3ee958 more refactoring: suck some stuff out of SRoA into 
ConvertToScalarInfo.

llvm-svn: 101425
 2010-04-16 00:20:00 +00:00
Gabor Greif 6af0ad846e shift intrinsic operand 
llvm-svn: 101423
 2010-04-16 00:06:45 +00:00
Chris Lattner 9ef4eae6e6 introduce a new ConvertToScalarInfo struct to simplify 
CanConvertToScalar/MergeInType.  Eliminate a pointless
LLVMContext argument to MergeInType.

llvm-svn: 101422
 2010-04-15 23:50:26 +00:00
Chris Lattner 9c1172d848 tidy interface to isOnlyCopiedFromConstantGlobal 
llvm-svn: 101405
 2010-04-15 21:59:20 +00:00
Gabor Greif 33ae80bff7 reapply r101364, which has been backed out in r101368 
with a fix

rotate CallInst operands, i.e. move callee to the back
of the operand array

the motivation for this patch are laid out in my mail to llvm-commits:
more efficient access to operands and callee, faster callgraph-construction,
smaller compiler binary

llvm-svn: 101397
 2010-04-15 20:51:13 +00:00
Dan Gohman b29cda9b3c Fix a bunch of namespace polution. 
llvm-svn: 101376
 2010-04-15 17:08:50 +00:00
Gabor Greif 9fd00c7d25 back out r101364, as it trips the linux nightlybot on some clang C++ tests 
llvm-svn: 101368
 2010-04-15 12:46:56 +00:00
Gabor Greif aafd209632 rotate CallInst operands, i.e. move callee to the back 
of the operand array

the motivation for this patch are laid out in my mail to llvm-commits:
more efficient access to operands and callee, faster callgraph-construction,
smaller compiler binary

llvm-svn: 101364
 2010-04-15 10:49:53 +00:00
Gabor Greif c08e5df836 performance: cache the dereferenced use_iterator 
llvm-svn: 101253
 2010-04-14 16:48:56 +00:00
Gabor Greif a49686fa3e performance: cache the dereferenced use_iterator 
llvm-svn: 101250
 2010-04-14 16:13:56 +00:00
Owen Anderson b516f1c6cc Remove SCCVN from the CMake build system. 
llvm-svn: 101125
 2010-04-13 08:33:09 +00:00
Owen Anderson 9ed6abfe0b SCCVN, we hardly knew ye! 
llvm-svn: 101117
 2010-04-13 05:24:08 +00:00