19eff2a9f6
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
8b3a17e613
Revert r108401; it breaks bootstrap :(
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llvm-svn: 108407
2010-07-15 05:09:31 +00:00
fd473a746c
Add AssertingVH which makes PR7647 break consistently.
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llvm-svn: 108401
2010-07-15 04:46:14 +00:00
c707fa9651
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
3afc0721c7
fix incorrect folding of icmp with undef, PR6481.
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llvm-svn: 97659
2010-03-03 19:46:03 +00:00
754e4a9801
Constant-fold certain comparisons with infinity and negative infinity.
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llvm-svn: 96777
2010-02-22 04:06:03 +00:00
3d9823b9cf
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
8574aba4ea
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
852d6d64ff
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
ab799110c6
I misread the parens, not so redundant after all.
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llvm-svn: 86648
2009-11-10 02:04:54 +00:00
ee89d5a4d0
remove some redundant parens.
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llvm-svn: 86645
2009-11-10 01:56:04 +00:00
fb7f87d5a3
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
a71e9d61be
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
ccfdceb22c
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
c1f19071f8
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
cdfb80de16
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
084a1b5581
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
Chris Lattner