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2010-05-20Minor code cleanups.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104287 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Make Solve check its own post-condition, to reduce clutter in theDan Gohman
top-level LSRInstance logic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104278 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Add comments.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104276 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20More code cleanups. Use iterators instead of indices when indicesDan Gohman
aren't needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104273 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Fix OptimizeShadowIV to set Changed. Change OptimizeLoopTermCond to setDan Gohman
Changed directly instead of using a return value. Rename FilterOutUndesirableDedicatedRegisters's Changed variable to distinguish it from LSRInstance's Changed member. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104269 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Add some comments.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104268 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Simplify this code. Don't do a DomTreeNode lookup for each visited block.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104267 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Minor code cleanups.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104263 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20When canonicalizing icmp operand order to put the loop invariantDan Gohman
operand on the left, the interesting operand is on the right. This fixes a bug where LSR was failing to recognize ICmpZero uses, which led it to be unable to reverse the induction variable in the attached testcase. Delete test/CodeGen/X86/stack-color-with-reg-2.ll, because its test is extremely fragile and hard to meaningfully update. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104262 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Set Changed to true when canonicalizing ICmp operand order; even thoughDan Gohman
it isn't a very interesting change, it's a change nonetheless. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104260 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Strip llvm.dbg.lv also.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104236 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Rename a variable to avoid shadowing.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104234 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Minor code simplification.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104232 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-20Move the code for deleting BaseRegs and LSRUses into helper functions,Dan Gohman
and fix a bug that valgrind noticed where the code would std::swap an element with itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104225 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-19Teach LSR how to cope better with unrolled loops on targets whereDan Gohman
the addressing modes don't make this trivially easy. This allows it to avoid falling into the less precise heuristics in more cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104186 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Add a comment.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104089 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Fix the predicate which checks for non-sensical formulae which haveDan Gohman
constants in registers which partially cancel out their immediate fields. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104088 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Factor out the code for recomputing an LSRUse's Regs set after someDan Gohman
of its formulae have been removed into a helper function, and also teach it how to update the RegUseTracker. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104087 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Factor out code for estimating search space complexity into a helperDan Gohman
function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104082 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Add some more debug output.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104080 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Factor out the code for deleting a formula from an LSRUse intoDan Gohman
a helper function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104079 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Make some debug output more informative.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104078 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Print an error message in Formula::print if the HasBaseReg flagDan Gohman
is inconsistent with the BaseRegs field. It's not print's job to assert on an invalid condition, but it can make one more obvious. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104077 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-18Rename RegUseTracker's RegUses member to RegUsesMap to avoidDan Gohman
confusion with LSRInstance's RegUses member. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104076 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-15Teach the always inliner to release its inline cost estimates, like the basicNick Lewycky
inliner did in r103653. Why does the always inliner even bother with cost estimates anyways? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103858 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-15Clean up, no functional change.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103857 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-13Remove heinous tabs.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103700 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-13Replace the core comparison login in merge functions. We can now mergeNick Lewycky
vector<>::push_back() in: int foo(vector<int> &a, vector<unsigned> &b) { a.push_back(10); b.push_back(11); } to two calls to the same push_back function, or fold away the two copies of push_back() in: struct T { int; }; struct S { char; }; vector<T*> t; vector<S*> s; void f(T *x) { t.push_back(x); } void g(S *x) { s.push_back(x); } but leave f() and g() separate, since they refer to two different global variables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103698 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-12Clear CachedFunctionInfo upon Pass::releaseMemory. Because ValueMap will abortNick Lewycky
on RAUW of functions, this is a correctness issue instead of a mere memory usage problem. No testcase until the new MergeFunctions can land. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103653 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-11I got tired of VISIBILITY_HIDDEN colliding with the gcc enum. Rename itDuncan Sands
to LLVM_LIBRARY_VISIBILITY and introduce LLVM_GLOBAL_VISIBILITY, which is the opposite, for future use by dragonegg. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103495 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-11Fixes for Microsoft Visual Studio 2010, from Steven Watanabe!Douglas Gregor
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103457 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-08make simplifycfg insert an llvm.trap before the 'unreachable' it introducesChris Lattner
when it detects undefined behavior. llvm.trap generally codegens into some thing really small (e.g. a 2 byte ud2 instruction on x86) and debugging this sort of thing is "nontrivial". For example, we now compile: void foo() { *(int*)0 = 42; } into: _foo: pushl %ebp movl %esp, %ebp ud2 Some may even claim that this is a security hole, though that seems dubious to me. This addresses rdar://7958343 - Optimizing away null dereference potentially allows arbitrary code execution git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103356 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-08Teach instcombine to transform a bitcast/(zext|trunc)/bitcast sequenceChris Lattner
with a vector input and output into a shuffle vector. This sort of sequence happens when the input code stores with one type and reloads with another type and then SROA promotes to i96 integers, which make everyone sad. This fixes rdar://7896024 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103354 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-08Fix PR7052, patch by Jakub Staszak!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103347 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-07When pruning candidate formulae out of an LSRUse, update theDan Gohman
LSRUse's Regs set after all pruning is done, rather than trying to do it on the fly, which can produce an incomplete result. This fixes a case where heuristic pruning was stripping all formulae from a use, which led the solver to enter an infinite loop. Also, add a few asserts to diagnose this kind of situation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103328 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-07Wrap const MDNode * inside DIDescriptor.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103295 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-07Use overloaded operators instead of DIDescriptor::getNode()Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103276 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-07Update CMake build.Ted Kremenek
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103266 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-07Add an LLVM IR version of code sinking. This uses the same simple algorithmDan Gohman
as MachineSink, but it isn't constrained by MachineInstr-level details. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103257 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-05Use the right version of "append" to combine two SmallVectors.Bob Wilson
This fixes the compile-time regressions seen in last night's tests. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103118 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-04Combine the implementations of the core part of the SSAUpdater andBob Wilson
MachineSSAUpdater to avoid duplicating all the code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103060 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-04Defer adding critical edges to the "toSplit" list until after checking forBob Wilson
indirect branches in all the predecessors. This avoids unnecessarily splitting edges in cases where load PRE is not possible anyway. Thanks to Jakub Staszak for pointing this out. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103034 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-03Use getConstant instead of getIntegerSCEV. The two are basically theDan Gohman
same, now that getConstant has overloads consistent with ConstantInt::get. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102965 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-03Check for side effects before splitting loop.Devang Patel
Patch by Jakub Staszak! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102928 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-01revert r102831. We already delete dead readonly calls inChris Lattner
other places, killing a valid transformation is not the right answer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102850 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-01Disable the call-deletion transformation introduced in r86975. WithoutOwen Anderson
halting analysis, it is illegal to delete a call to a read-only function. The correct solution is almost certainly to add a "must halt" attribute and only allow deletions in its presence. XFAIL the relevant testcase for now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102831 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-01rename InlineInfo.DevirtualizedCalls -> InlinedCalls toChris Lattner
reflect that it includes all inlined calls now, not just devirtualized ones. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102824 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-01Implement rdar://6295824 and PR6724 with two tiny changesChris Lattner
that can have a big effect :). The first is to enable the iterative SCC passmanager juice that kicks in when the scc passmgr detects that a function pass has devirtualized a call. In this case, it will rerun all the passes it manages on the SCC, up to the iteration count limit (4). This is useful because a function pass may devirualize a call, and we want the inliner to inline it, or pruneeh to infer stuff about it, etc. The second patch is to add *all* call sites to the DevirtualizedCalls list the inliner uses. This list is about to get renamed, but the jist of this is that the inliner now reconsiders *all* inlined call sites as candidates for further inlining. The intuition is this that in cases like this: f() { g(1); } g(int x) { h(x); } We analyze this bottom up, and may decide that it isn't profitable to inline H into G. Next step, we decide that it is profitable to inline G into F, and do so, which means that F now calls H. Even though the call from G -> H may not have been profitable to inline, the call from F -> H may be (in this case because a constant allows folding etc). In my spot checks, this doesn't have a big impact on code. For example, the LLC output for 252.eon grew from 0.02% (from 317252 to 317308) and 176.gcc actually shrunk by .3% (from 1525612 to 1520964 bytes). 252.eon never iterated in the SCC Passmgr, 176.gcc iterated at most 1 time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102823 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-01The inliner has traditionally not considered call sitesChris Lattner
that appear due to inlining a callee as candidates for futher inlining, but a recent patch made it do this if those call sites were indirect and became direct. Unfortunately, in bizarre cases (see testcase) doing this can cause us to infinitely inline mutually recursive functions into callers not in the cycle. Fix this by keeping track of the inline history from which callsite inline candidates got inlined from. This shouldn't affect any "real world" code, but is required for a follow on patch that is coming up next. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102822 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-30Preserve debug info attached with call instruction while eliminating dead ↵Devang Patel
argument. Radar 7927803 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102760 91177308-0d34-0410-b5e6-96231b3b80d8
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