Owen Anderson
3d4644bad9
Revert r114097, adding back in the assertion against replacing an Instruction by itself. Now that CorrelatedValuePropagation is
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more careful not to call SimplifyInstructionsInBlock() on an unreachable block, the issue has been fixed at a higher level. Add
a big warning to SimplifyInstructionsInBlock() to hopefully prevent this in the future.
llvm-svn: 114117
2010-09-16 20:51:41 +00:00
Owen Anderson
521e8dfef8
Fix PR8161, in which an unreachable loop causes recursive instruction simplification to try
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to replace an instruction with itself. Add a predicate to the simplifier to prevent this case.
llvm-svn: 114097
2010-09-16 17:42:36 +00:00
Benjamin Kramer
6110efbf8c
Teach InstructionSimplify to fold (A & B) & A -> A & B and (A | B) | A -> A | B.
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Reassociate does this but it doesn't catch all cases (e.g. if the operands are i1).
llvm-svn: 113651
2010-09-10 22:39:55 +00:00
Chris Lattner
2b2265a9c5
Fix PR7647, handling the case when 'To' ends up being
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mutated by recursive simplification. This also enhances
ReplaceAndSimplifyAllUses to actually do a real RAUW
at the end of it, which updates any value handles
pointing to "From" to start pointing to "To". This
seems useful for debug info and random other VH users.
llvm-svn: 108415
2010-07-15 06:36:08 +00:00
Eli Friedman
f7ae898f2b
Revert r108401; it breaks bootstrap :(
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llvm-svn: 108407
2010-07-15 05:09:31 +00:00
Eli Friedman
5d36d37a4a
Add AssertingVH which makes PR7647 break consistently.
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llvm-svn: 108401
2010-07-15 04:46:14 +00:00
Chris Lattner
b6b95141ec
move some select simplifications out out instcombine into
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inst simplify. No functionality change.
llvm-svn: 101873
2010-04-20 05:32:14 +00:00
Chris Lattner
9e230fb6b2
fix incorrect folding of icmp with undef, PR6481.
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llvm-svn: 97659
2010-03-03 19:46:03 +00:00
Dan Gohman
dcc3634e46
Constant-fold certain comparisons with infinity and negative infinity.
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llvm-svn: 96777
2010-02-22 04:06:03 +00:00
Chris Lattner
bdaed088ea
factor some logic out of instcombine into a new SimplifyAddInst method.
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llvm-svn: 90011
2009-11-27 17:42:22 +00:00
Chris Lattner
6611a6f733
factor some instcombine simplifications for getelementptr out to a new
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SimplifyGEPInst method in InstructionSimplify.h. No functionality change.
llvm-svn: 89980
2009-11-27 00:29:05 +00:00
Chris Lattner
ec4264fbb0
move some generally useful functions out of jump threading
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into libanalysis and transformutils.
llvm-svn: 86735
2009-11-10 22:26:15 +00:00
Chris Lattner
04da9d4b33
I misread the parens, not so redundant after all.
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llvm-svn: 86648
2009-11-10 02:04:54 +00:00
Chris Lattner
fb540241c8
remove some redundant parens.
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llvm-svn: 86645
2009-11-10 01:56:04 +00:00
Chris Lattner
a279728372
add a new SimplifyInstruction API, which is like ConstantFoldInstruction,
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except that the result may not be a constant. Switch jump threading to
use it so that it gets things like (X & 0) -> 0, which occur when phi preds
are deleted and the remaining phi pred was a zero.
llvm-svn: 86637
2009-11-10 01:08:51 +00:00
Chris Lattner
3730cf6fef
factor simplification logic for AND and OR out to InstSimplify from instcombine.
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llvm-svn: 86635
2009-11-10 00:55:12 +00:00
Chris Lattner
9941f27797
pull a bunch of logic out of instcombine into instsimplify for compare
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simplification, this handles the foldable fcmp x,x cases among many others.
llvm-svn: 86627
2009-11-09 23:55:12 +00:00
Chris Lattner
25700676d4
rename SimplifyCompare -> SimplifyCmpInst and split it into
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Simplify[IF]Cmp pieces. Add some predicates to CmpInst to
determine whether a predicate is fp or int.
llvm-svn: 86624
2009-11-09 23:28:39 +00:00
Chris Lattner
131172dc76
fix ConstantFoldCompareInstOperands to take the LHS/RHS as
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individual operands instead of taking a temporary array
llvm-svn: 86619
2009-11-09 23:06:58 +00:00
Chris Lattner
126d78f1c7
stub out a new libanalysis "instruction simplify" interface that
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takes decimated instructions and applies identities to them. This
is pretty minimal at this point, but I plan to pull some instcombine
logic out into these and similar routines.
llvm-svn: 86613
2009-11-09 22:57:59 +00:00
