lli and llc. This is controlled with options -tracehash on|off.
Also, added an option to specify which functions should be traced.
Particularly useful to reduce output volume in basic-block tracing.
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* Add optimization to rank computation to not recursively search when
unneccesary.
* More agressively negate expressions to open reassociation opportunities.
* Linearize (A+B)+(C+D) into ((A+B)+C)+D
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2637 91177308-0d34-0410-b5e6-96231b3b80d8
By making sure to consider binary expressions identical if their operands
are backwards, but swappable.
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"This testcase caused instcombine to fail because it got the same instruction on
it's worklist more than once (which is ok), but then deleted the instruction.
Since the inst stayed on the worklist, as soon as it came back up to be
processed, bad things happened, and opt asserted."
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be put either before or after a load. We chose to cast the value loaded
instead of the pointer to load from.
Fixes bug: test/Regression/Transforms/LevelRaise/2002-05-10-LoadPeephole.ll
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* Make cast-of-self-ty DCE the dead cast instruction immediately instead of
waiting for it to be DCE'd by another sweep over the function. This speeds
this up noticably.
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* Convert main constant propogation pass to be worklist driven instead of
iterative.
* -constprop pass no longer "constant propogates" terminator instructions
- CFG is now preserved!
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* Remove dead PHI case (which could not work due to getNumOperands rather than
getNumIncomingValues. This really belongs in InstCombine, anyway so we'll
move it there.
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test/Regression/Transforms/SCCP/2002-05-02-EdgeFailure.ll
* SCCP now preserves the CFG: It leaves conditional branches the way they
are in the program, not simplifying them. A seperate pass should eliminate
the potentially dead basic blocks and edges in the CFG.
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* Change worklist to a set so that duplicates cannot happen
* Add support for the invoke instruction
* Avoid marking store and free instructions as overdefined, since they
cannot produce a value anyway.
* Inline the OperandChangedState implementation
* Add isEdgeFeasible in preparation to fix a bug. Right now it behaves
exactly as before.
* Remove obsolete comment about constant pools
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* Do not skip the instruction immediately after a folded instruction. This
was causing the testcase failure:
test/Regression/Transforms/SCCP/2002-05-02-MissSecondInst.ll
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