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2004-12-11The split bb is really the exit of the old functionChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18799 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-11Two bug fixes:Chris Lattner
1. Actually increment the Statistic for the GV elim optzn 2. When resolving undef branches, only resolve branches in executable blocks, avoiding marking a bunch of completely dead blocks live. This has a big impact on the quality of the generated code. With this patch, we positively rip up vortex, compiling Ut_MoveBytes to a single memcpy call. In vortex we get this: 12 ipsccp - Number of globals found to be constant 986 ipsccp - Number of arguments constant propagated 1378 ipsccp - Number of basic blocks unreachable 8919 ipsccp - Number of instructions removed git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18796 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-11Do not delete the entry block to a function.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18795 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-11Implement Transforms/SCCP/ipsccp-gvar.ll, by tracking values stored toChris Lattner
non-address-taken global variables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18790 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-11Fix a bug where we could delete dead invoke instructions with uses.Chris Lattner
In functions where we fully constant prop the return value, replace all ret instructions with 'ret undef'. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18786 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-10Implement SCCP/ipsccp-conditional.ll, by totally deleting dead blocks.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18781 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-10Fix SCCP/2004-12-10-UndefBranchBug.llChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18776 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-10Fix Regression/Transforms/SimplifyCFG/2004-12-10-SimplifyCFGCrash.ll,Chris Lattner
and the failure on make_dparser last night. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18766 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-10This is the initial implementation of IPSCCP, as requested by Brian.Chris Lattner
This implements SCCP/ipsccp-basic.ll, rips apart Olden/mst (as described in PR415), and does other nice things. There is still more to come with this, but it's a start. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18752 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-09note to self: Do not check in debugging code!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18693 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-09Implement trivial sinking for load instructions. This causes us to sink 567 ↵Chris Lattner
loads in spec git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18692 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-08Do extremely simple sinking of instructions when they are only used in aChris Lattner
successor block. This turns cases like this: x = a op b if (c) { use x } into: if (c) { x = a op b use x } This triggers 3965 times in spec, and is tested by Regression/Transforms/InstCombine/sink_instruction.ll This appears to expose a bug in the X86 backend for 177.mesa, which I'm looking in to. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18677 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-08Fix this regression and remove the XFAIL from this test.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18674 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-08Fix Transforms/InstCombine/2004-12-08-RemInfiniteLoop.llChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18670 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-08Add support for compilers without argument dependent name lookup, contributedChris Lattner
by Bjørn Wennberg git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18627 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-08Remove unneeded class qualifier, contributed by Bjørn WennbergChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18625 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-07For PR387:\Reid Spencer
Add doInitialization method to avoid overloaded virtuals git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18602 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-03Implement stripping of debug symbols, making the --strip-debug options inChris Lattner
gccas/gccld more than just a noop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18456 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-02Initial reimplementation of the -strip pass, with a stub for implementingChris Lattner
-S git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18440 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-02This pass is moving to lib IPOChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18439 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-02Implement a FIXME by checking to make sure that a malloc is not being usedChris Lattner
in scary and unknown ways before we promote it. This fixes the miscompilation of 188.ammp that has been plauging us since a globalopt patch went in. Thanks a ton to Tanya for helping me diagnose the problem! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18418 91177308-0d34-0410-b5e6-96231b3b80d8
2004-12-02Fix a minor bug where we set a var to initialized on malloc, not on store.Chris Lattner
This doesn't fix anything that I'm aware of, just noticed it by inspection git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18417 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-30This pass is completely broken.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18387 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-30Squelch warningChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18381 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-30Fix test/Regression/Transforms/LICM/2004-09-14-AliasAnalysisInvalidate.llxChris Lattner
This only fails on darwin or on X86 under valgrind. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18377 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-30Alkis noticed that this variable is dead. Thanks!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18369 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-30If we have something like this:Chris Lattner
if (x) { code ... } else { code ... } Turn it into: code if (x) { ... } else { ... } This reduces code size and in some common cases allows us to completely eliminate the conditional. This turns several if/then/else blocks in loops into straightline code in 179.art, turning the loops into single basic blocks (good for modsched even!). Maybe now brg will leave me alone ;-) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18366 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-29Allow hoisting loads of globals and alloca's in conditionals.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18363 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-28Fix for PR454:Reid Spencer
* Make sure we handle signed to unsigned conversion correctly * Move this visitSetCondInst case to its own method. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18312 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-28Make DSE potentially more aggressive by being more specific about alloca sizes.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18309 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-27Implement Regression/Transforms/InstCombine/getelementptr_cast.ll, whichChris Lattner
occurs many times in crafty git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18273 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-26Provide size information when checking to see if we can LICM a load, thisChris Lattner
allows us to hoist more loads in some cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18265 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-22Do not count debugger intrinsics in size estimation.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18110 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-22Ignore debugger intrinsics when doing inlining size computations.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18109 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-22Do not consider debug intrinsics in the size computations for loop unrolling.Chris Lattner
Patch contributed by Michael McCracken! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18108 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-20Allow constructor parameter to override aggregating args; fix spacingMisha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18028 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-19Fix the exposed prototype for the lower packed pass, thanks toChris Lattner
Morten Ofstad. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17996 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-19CPR is dead.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17992 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-18Delete stoppoints that occur for the same source line.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17970 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-18Check in hook that I forgotChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17956 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-16Do not delete dead invoke instructions!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17897 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-15Remove unused variable for compilation by VC++.Reid Spencer
Patch contributed by Morten Ofstad. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17830 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-15Minor cleanups. There is no reason for SCCP to derive from instvisitor anymore.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17825 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-15Count more accuratelyChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17824 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-15Quiet warnings on the persephone testerChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17821 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-15Two minor improvements:Chris Lattner
1. Speedup getValueState by having it not consider Arguments. It's better to just add them before we start SCCP'ing. 2. SCCP can delete the contents of dead blocks. No really, it's ok! This reduces the size of the IR for subsequent passes, even though simplifycfg would do the same job. In practice, simplifycfg does not run until much later than sccp in gccas git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17820 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-15rename InstValue to LatticeValue, as it holds for more than instructions.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17818 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-15Substantially refactor the SCCP class into an SCCP pass and an SCCPSolverChris Lattner
class. The only changes are minor: * Do not try to SCCP instructions that return void in the rewrite loop. This is silly and fool hardy, wasting a map lookup and adding an entry to the map which is never used. * If we decide something has an undefined value, rewrite it to undef, potentially leading to further simplications. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17816 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-14If a global is just loaded and restored, realize that it is not changingChris Lattner
value. This allows us to turn more globals into constants and eliminate them. This patch implements GlobalOpt/load-store-global.llx. Note that this patch speeds up 255.vortex from: Output/255.vortex.out-cbe.time:program 7.640000 Output/255.vortex.out-llc.time:program 9.810000 to: Output/255.vortex.out-cbe.time:program 7.250000 Output/255.vortex.out-llc.time:program 9.490000 Which isn't bad at all! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17746 91177308-0d34-0410-b5e6-96231b3b80d8
2004-11-14This optimization makes MANY phi nodes that all have the same incoming value.Chris Lattner
If this happens, detect it early instead of relying on instcombine to notice it later. This can be a big speedup, because PHI nodes can have many incoming values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17741 91177308-0d34-0410-b5e6-96231b3b80d8
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