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2008-06-22Fix PR2369 by making scalarrepl more careful about promoting Chris Lattner
structures. Its default threshold is to promote things that are smaller than 128 bytes, which is sane. However, it is not sane to do this for things that turn into 128 *registers*. Add a cap on the number of registers introduced, defaulting to 128/4=32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52611 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-21Fix for PR2479: correctly optimize expressions like (a > 13) & (a == Eli Friedman
15). See also PR1800, which is about the signed case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52608 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-21Use Instruction::eraseFromParent().Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52606 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-21Fix warning when assertions disabled.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52590 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-21Enable PRE.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52574 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-21Back out Matthijs' DAE patches. It's miscompiling gcc driver.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52570 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Clean up a use of std::distance.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52544 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Tidy up some commments and use the getAggregateOperand andDan Gohman
getInsertedValueOperand accessors. Thanks Matthijs! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52543 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Fix the conditions under which SCCP should examine insertvalueDan Gohman
instructions. Thanks to Matthijs Kooijman for pointing this out! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52542 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-2080 column and trailing whitespace fixes.Matthijs Kooijman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52539 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Don't let DeadArgumentElimination attempt to update callers when the returnMatthijs Kooijman
type wasn't changed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52538 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Don't let DeadArgElimination change the return type ({} into void and {T}Matthijs Kooijman
into T) when no return values are actually dead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52537 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Explicitely track if any arguments or return values were removed inMatthijs Kooijman
DeadArgumentElimination and assert that the function type does not change if nothing was changed. This should catch subtle changes in function type that are not intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52536 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Remove debug output.Matthijs Kooijman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52535 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Recommit r52459, rewriting of the dead argument elimination pass.Matthijs Kooijman
This is a fixed version that no longer uses multimap::equal_range, which resulted in a pointer invalidation problem. Also, DAE::InspectedFunctions was not really necessary, so it got removed. Lastly, this version no longer applies the extra arg hack on functions who did not have any arguments to start with. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52532 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Really disable PRE.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52531 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Fix PR2471, which is a bug involving an invalid promotion from a conditional ↵Chris Lattner
load. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52525 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Change around the data structures used to store availability sets, resulting ↵Owen Anderson
in a GVN+PRE that is faster that GVN alone was before. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52521 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Teach SCCP about insertvalue and extractvalue, and aboutDan Gohman
propagating constants across aggregate return values when insertvalue and extractvalue are used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52520 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Teach InlineFunction how to differentiate between multiple-valueDan Gohman
return statements and aggregate returns so that it handles both correctly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52519 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Disable PRE for now. It seems to be breaking llvm-gcc bootstrapping.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52518 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Add a hidden -disable-pre flag for testing purposes. This should be removedOwen Anderson
once benchmarking is completed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52506 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19PRE requires that critical edges be split.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52505 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Remove dead code causing a warning.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52502 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Use the common API for adding instructions to basic blocks instead ofDan Gohman
using BasicBlock::getInstList. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52500 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Be sure to remove values from the value numbering table after we delete them.Owen Anderson
This fixes a failure on povray. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52499 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Use Instruction::moveBefore instead of manipulating the instruction listDan Gohman
directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52498 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Avoid using BasicBlock::getInstList directly in a few places.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52497 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Revert support for insertvalue and extractvalue instructions for the moment.Owen Anderson
GVN expects that all inputs which to an instruction fall somewhere in the value hierarchy, which isn't true for these. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52496 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Delete dead code.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52494 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Use a CallSite to find the nth argument of a call/invoke instruction instead ofMatthijs Kooijman
using getOperand() directly. This makes things work with invoke instructions as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52489 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Add support for extractvalue and insertvalue instructions in GVN.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52472 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Add local PRE to GVN. This only operates in cases where it would not ↵Owen Anderson
increase code size, namely when the instantiated expression would only need to be created in one predecessor. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52471 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Fix the regressions on sext-misc.ll my patch yesterday caused.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52466 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Revert r52459, which was causing an infinite loop or massive slowdown on ↵Owen Anderson
MultiSource/Applications/SPASS, and possibly others as well. Please reapply once this is fixed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52465 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Move LSR's private isZero function to a public SCEV memberDan Gohman
function, and make use of it in several places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52463 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Rewrite the DeadArgumentElimination pass, to use a more explicit tracking ofMatthijs Kooijman
dependencies between return values and/or arguments. Also make the handling of arguments and return values the same. The pass now looks properly inside returned structs, but only at the first level (ie, not inside nested structs). Also add a testcase for testing various variations of (multiple) dead rerturn values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52459 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Reapply r52397 (make IPConstProp promote returned arguments), but fixed thisMatthijs Kooijman
time. Sorry for the trouble! This time, also add a testcase, which I should have done in the first place... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52455 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Reapply r52396, it was unrelated to the breakage (that was caused by r52397, myMatthijs Kooijman
commit after this). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52453 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18implement some simple bswap optimizations, rdar://5992453Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52442 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18make truncate/sext elimination capable of changing phi's. This Chris Lattner
implements rdar://6013816 and the testcase in Transforms/InstCombine/sext-misc.ll. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52440 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-18Preserve dominance frontier while trivially unswitching loop.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52438 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17We don't want to find dependencies within the same block in this case. It ↵Owen Anderson
leads to incorrect results because we're detecting something at or after the call we're querying on. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52433 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17revert recent patch which is causing widespread breakage.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52415 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17Fix typo that changed the logic to something wrong.Duncan Sands
Spotted by Nick Lewycky. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52411 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17Learn IPConstProp to propagate arguments that are directly returned. StrictlyMatthijs Kooijman
speaking these are not constant values. However, when a function always returns one of its arguments, then from the point of view of each caller the return value is constant (or at least a known value) and can be replaced. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52397 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17Learn IPConstProp to look at individual return values and propagate themMatthijs Kooijman
individually. Also learn IPConstProp how returning first class aggregates work, in addition to old style multiple return instructions. Modify the return-constants testscase to confirm this behaviour. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52396 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-16Refine the change in r52258 for avoiding use-before-def conditionsDan Gohman
when changing the stride of a comparison so that it's slightly more precise, by having it scan the instruction list to determine if there is a use of the condition after the point where the condition will be inserted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52371 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-16Switch over to SetVector to ensure same order of iterations do not vary ↵Evan Cheng
across runs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52361 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-16Iterating over SmallPtrSet is not deterministic.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52339 91177308-0d34-0410-b5e6-96231b3b80d8
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