ac229124f4
Rewrite part of the SSAUpdater to be more careful about inserting redundant
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PHIs. The previous algorithm was unable to reliably detect when existing
PHIs in a cycle can be reused. I'm still working on reducing a testcase.
Radar 7711900.
llvm-svn: 100047
2010-03-31 20:51:00 +00:00
7577e948e4
Avoid creating redundant PHIs in SSAUpdater::GetValueInMiddleOfBlock.
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This was already being done in SSAUpdater::GetValueAtEndOfBlock so I've
just changed SSAUpdater to check for existing PHIs in both places.
llvm-svn: 94690
2010-01-27 22:01:02 +00:00
3774a38fdf
Change errs() to dbgs().
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llvm-svn: 92603
2010-01-05 01:26:49 +00:00
eaa25da8bb
improve indentation avoid a pointless conversion from weakvh to trackingvh,
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no functionality change.
llvm-svn: 91848
2009-12-21 22:43:03 +00:00
8fb07c5a21
fix PR5837 by having SSAUpdate reuse phi nodes for the
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'GetValueInMiddleOfBlock' case, instead of inserting
duplicates.
A similar fix is almost certainly needed by the machine-level
SSAUpdate implementation.
llvm-svn: 91820
2009-12-21 07:16:11 +00:00
2bd9609992
add an assert to make it really clear what this is doing. Return singularval as
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a compile time perf optimization to avoid a load.
llvm-svn: 90507
2009-12-04 01:03:32 +00:00
7f903681ac
alternate fix for PR5258 which avoids worklist problems, with reduced testcase.
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llvm-svn: 84667
2009-10-20 20:27:49 +00:00
cf10ec951d
Fix PR5258, jump-threading creating invalid PHIs.
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When an incoming value for a PHI is updated, we must also updated all other
incoming values for the same BB to match, otherwise we create invalid PHIs.
llvm-svn: 84638
2009-10-20 15:42:00 +00:00
0058c7bcb0
Strip trailing white space.
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llvm-svn: 84256
2009-10-16 15:20:13 +00:00
9c382cebc5
add a simple helper method.
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llvm-svn: 83745
2009-10-10 23:41:48 +00:00
249265de06
add ability for clients of SSAUpdater to find out about the
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PHI nodes inserted.
llvm-svn: 83744
2009-10-10 23:15:24 +00:00
67cdd8b567
add the ability to get a rewritten value from the middle of a block,
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not just at the end. Add a big comment explaining when this could
be useful (which never happens for jump threading).
llvm-svn: 83741
2009-10-10 23:00:11 +00:00
e474a8d3a7
rename GetValueInBlock -> GetValueAtEndOfBlock to better reflect
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what it does.
llvm-svn: 83740
2009-10-10 22:41:58 +00:00
65e69a77e1
use a typedef instead of spelling out an insane type. Yay for auto someday.
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llvm-svn: 83707
2009-10-10 09:09:20 +00:00
60d4e69c81
Implement an efficient and fully general SSA update mechanism that
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works on unstructured CFGs. This implements PR217, our oldest open PR.
llvm-svn: 83705
2009-10-10 09:04:27 +00:00
Bob Wilson