aboutsummaryrefslogtreecommitdiff
path: root/lib/Transforms
AgeCommit message (Collapse)Author
2004-03-17Be more accurateChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12464 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-16Fix bug in previous checkinChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12458 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-16Okay, so there is no reasonable way for tail duplication to update SSA form,Chris Lattner
as it is making effectively arbitrary modifications to the CFG and we don't have a domset/domfrontier implementations that can handle the dynamic updates. Instead of having a bunch of code that doesn't actually work in practice, just demote any potentially tricky values to the stack (causing the problem to go away entirely). Later invocations of mem2reg will rebuild SSA for us. This fixes all of the major performance regressions with tail duplication from LLVM 1.1. For example, this loop: --- int popcount(int x) { int result = 0; while (x != 0) { result = result + (x & 0x1); x = x >> 1; } return result; } --- Used to be compiled into: int %popcount(int %X) { entry: br label %loopentry loopentry: ; preds = %entry, %no_exit %x.0 = phi int [ %X, %entry ], [ %tmp.9, %no_exit ] ; <int> [#uses=3] %result.1.0 = phi int [ 0, %entry ], [ %tmp.6, %no_exit ] ; <int> [#uses=2] %tmp.1 = seteq int %x.0, 0 ; <bool> [#uses=1] br bool %tmp.1, label %loopexit, label %no_exit no_exit: ; preds = %loopentry %tmp.4 = and int %x.0, 1 ; <int> [#uses=1] %tmp.6 = add int %tmp.4, %result.1.0 ; <int> [#uses=1] %tmp.9 = shr int %x.0, ubyte 1 ; <int> [#uses=1] br label %loopentry loopexit: ; preds = %loopentry ret int %result.1.0 } And is now compiled into: int %popcount(int %X) { entry: br label %no_exit no_exit: ; preds = %entry, %no_exit %x.0.0 = phi int [ %X, %entry ], [ %tmp.9, %no_exit ] ; <int> [#uses=2] %result.1.0.0 = phi int [ 0, %entry ], [ %tmp.6, %no_exit ] ; <int> [#uses=1] %tmp.4 = and int %x.0.0, 1 ; <int> [#uses=1] %tmp.6 = add int %tmp.4, %result.1.0.0 ; <int> [#uses=2] %tmp.9 = shr int %x.0.0, ubyte 1 ; <int> [#uses=2] %tmp.1 = seteq int %tmp.9, 0 ; <bool> [#uses=1] br bool %tmp.1, label %loopexit, label %no_exit loopexit: ; preds = %no_exit ret int %tmp.6 } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12457 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-16This code was both incredibly complex and incredibly broken. Fix it.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12456 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-16Punt if we see gigantic PHI nodes. This improves a huge interpreter loopChris Lattner
testcase from 32.5s in -raise to take .3s git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12443 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-16Do not try to optimize PHI nodes with incredibly high degree. This reduces SCCPChris Lattner
time from 615s to 1.49s on a large testcase that has a gigantic switch statement that all of the blocks in the function go to (an intepreter). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12442 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-16Do not copy gigantic switch instructionsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12441 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-16Fix a regression from this patch:Chris Lattner
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20040308/013095.html Basically, this patch only updated the immediate dominatees of the header node to tell them that the preheader also dominated them. In practice, ALL dominatees of the header node are also dominated by the preheader. This fixes: LoopSimplify/2004-03-15-IncorrectDomUpdate. and PR293 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12434 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-15Restore old inlining heuristic. As the comment indicates, this is a nastyChris Lattner
horrible hack. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12423 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-15Add counters for the number of calls elimiantedChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12420 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-15Implement LICM of calls in simple cases. This is sufficient to move aroundChris Lattner
sin/cos/strlen calls and stuff. This implements: LICM/call_sink_pure_function.ll LICM/call_sink_const_function.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12415 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-15Mostly cosmetic improvements. Do fix the bug where a global value was ↵Chris Lattner
considered an input. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12406 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-15Assert that input blocks meet the invariants we expectChris Lattner
Simplify the input/output finder. All elements of a basic block are instructions. Any used arguments are also inputs. An instruction can only be used by another instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12405 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-15Fix several bugs in the loop extractor. In particular, subloops were neverChris Lattner
extracted, and a function that contained a single top-level loop never had the loop extracted, regardless of how much non-loop code there was. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12403 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14No correctness fixes here, just minor qoi fixes:Chris Lattner
* Don't insert a branch to the switch instruction after the call, just make it a single block. * Insert the new alloca instructions in the entry block of the original function instead of having them execute dynamically * Don't make the default edge of the switch instruction go back to the switch. The loop extractor shouldn't create new loops! * Give meaningful names to the alloca slots and the reload instructions * Some minor code simplifications git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12402 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Simplify code a bit, and fix bug CodeExtractor/2004-03-14-NoSwitchSupport.llChris Lattner
This also implements a two minor improvements: * Don't insert live-out stores IN the region, insert them on the code path that exits the region * If the region is exited to the same block from multiple paths, share the switch statement entry, live-out store code, and the basic block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12401 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Simplify the code a bit by making the collection of basic blocks to extractChris Lattner
a member of the class. While we're at it, turn the collection into a set instead of a vector to improve efficiency and make queries simpler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12400 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Split into two passes. Now there is the general loop extractor, usable onChris Lattner
the command line, and the single loop extractor, usable by bugpoint git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12390 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Passes don't print stuff!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12385 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Do not create empty basic blocks when the lowerswitch pass expects blocks toChris Lattner
be non-empty! This fixes LowerSwitch/2004-03-13-SwitchIsDefaultCrash.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12384 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Minor random cleanupsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12382 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14FunctionPass's should not define their own 'run' method.Chris Lattner
Require 'simplified' loops, not just raw natural loops. This fixes CodeExtractor/2004-03-13-LoopExtractorCrash.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12381 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14If a block is dead, dominators will not be calculated for it. Because of thisChris Lattner
loop information won't see it, and we could have unreachable blocks pointing to the non-header node of blocks in a natural loop. This isn't tidy, so have the loopsimplify pass clean it up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12380 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Verify functions as they are produced if -debug is specified. ReduceChris Lattner
curly braceage git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12378 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Move prototype to IPO.h instead of Scalar.hChris Lattner
Make sure that the file interface header (IPO.h) is included first remove dead #incldue git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12375 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Indent anon namespace properly, add copyright blockChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12373 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14Move to the IPO library. Utils shouldn't contain passes.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12372 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-14DemoteRegToStack got moved from DemoteRegToStack.h to Local.hChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12368 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-13Add some debugging outputChris Lattner
Fix InstCombine/2004-03-13-InstCombineInfLoop.ll which caused an infinite loop compiling (I think) povray. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12365 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-13This change makes two big adjustments.Chris Lattner
* Be a lot more accurate about what the effects will be when inlining a call to a function when an argument is an alloca. * Dramatically reduce the penalty for inlining a call in a large function. This heuristic made it almost impossible to inline a function into a large function, no matter how small the callee is. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12363 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-13This little patch speeds up the loop used to update the dominator set analysis.Chris Lattner
On the testcase from GCC PR12440, which has a LOT of loops (1392 of which require preheaders to be inserted), this speeds up the loopsimplify pass from 1.931s to 0.1875s. The loop in question goes from 1.65s -> 0.0097s, which isn't bad. All of these times are a debug build. This adds a dependency on DominatorTree analysis that was not there before, but we always had dominatortree available anyway, because LICM requires both loop simplify and DT, so this doesn't add any extra analysis in practice. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12362 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-13Implement sub.ll:test14Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12355 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-12Implement InstCombine/sub.ll:test12 & test13Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12353 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-12Add constant folding wrapper support for select instructions.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12319 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-12Add sccp support for select instructionsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12318 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-12Add trivial optimizations for select instructionsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12317 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-08Initial support for edge profilingChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12225 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-08Split utility functions out of BlockProfiling.cppChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12224 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-08finegrainify namespacificationChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12221 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-08Implement ArgumentPromotion/aggregate-promote.llChris Lattner
This allows pointers to aggregate objects, whose elements are only read, to be promoted and passed in by element instead of by reference. This can enable a LOT of subsequent optimizations in the caller function. It's worth pointing out that this stuff happens a LOT of C++ programs, because objects in templates are generally passed around by reference. When these templates are instantiated on small aggregate or scalar types, however, it is more efficient to pass them in by value than by reference. This transformation triggers most on C++ codes (e.g. 334 times on eon), but does happen on C codes as well. For example, on mesa it triggers 72 times, and on gcc it triggers 35 times. this is amazingly good considering that we are using 'basicaa' so far. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12202 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-07Implement: ArgumentPromotion/chained.llChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12200 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-07Fix another minor bug, exposed by perlbmkChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12198 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-07Since 'load null' is undefined, we can make it do whatever we want. ReturningChris Lattner
a zero value is the most likely way to cause further simplification, so we do it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12197 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-07Fix a minor bug and turn debug output into, well, debug output.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12195 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-07New LLVM pass: argument promotion. This version only handles simple scalarChris Lattner
variables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12193 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-03Don't emit things like malloc(16*1). Allocation instructions are fixed ↵Chris Lattner
arity now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12086 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-02Implement ExtractCodeRegion()Misha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12070 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-02Make a note that this is usually used via bugpoint.Misha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12068 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-01* Add implementation of ExtractBasicBlock()Misha Brukman
* Add comments to ExtractLoop() git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12053 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-01Disable tail duplication in a case that breaks on Olden/tspChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12021 91177308-0d34-0410-b5e6-96231b3b80d8
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2025-08-03 20:22:23 +0000