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2012-01-11Re-fix the issue Bill fixed in r147899 in a slightly different way, which ↵Eli Friedman
doesn't abuse the semantics of linker_private. We don't really want to merge any string constant with a weak_odr global. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147971 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-11[asan] extend the workaround for http://llvm.org/bugs/show_bug.cgi?id=11395: ↵Kostya Serebryany
don't instrument the function at all on x86_32 if it has a large asm blob git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147953 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-11Improved compile time:Stepan Dyatkovskiy
1. Size heuristics changed. Now we calculate number of unswitching branches only once per loop. 2. Some checks was moved from UnswitchIfProfitable to processCurrentLoop, since it is not changed during processCurrentLoop iteration. It allows decide to skip some loops at an early stage. Extended statistics: - Added total number of instructions analyzed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147935 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-11If the global variable is removed by the linker, then don't constant merge itBill Wendling
with other symbols. An object in the __cfstring section is suppoed to be filled with CFString objects, which have a pointer to ___CFConstantStringClassReference followed by a pointer to a __cstring. If we allow the object in the __cstring section to be merged with another global, then it could end up in any section. Because the linker is going to remove these symbols in the final executable, we shouldn't bother to merge them. <rdar://problem/10564621> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147899 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-10Enable LSR IV Chains with sufficient heuristics.Andrew Trick
These heuristics are sufficient for enabling IV chains by default. Performance analysis has been done for i386, x86_64, and thumbv7. The optimization is rarely important, but can significantly speed up certain cases by eliminating spill code within the loop. Unrolled loops are prime candidates for IV chains. In many cases, the final code could still be improved with more target specific optimization following LSR. The goal of this feature is for LSR to make the best choice of induction variables. Instruction selection may not completely take advantage of this feature yet. As a result, there could be cases of slight code size increase. Code size can be worse on x86 because it doesn't support postincrement addressing. In fact, when chains are formed, you may see redundant address plus stride addition in the addressing mode. GenerateIVChains tries to compensate for the common cases. On ARM, code size increase can be mitigated by using postincrement addressing, but downstream codegen currently misses some opportunities. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147826 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-09Adding IV chain generation to LSR.Andrew Trick
After collecting chains, check if any should be materialized. If so, hide the chained IV users from the LSR solver. LSR will only solve for the head of the chain. GenerateIVChains will then materialize the chained IV users by computing the IV relative to its previous value in the chain. In theory, chained IV users could be exposed to LSR's solver. This would be considerably complicated to implement and I'm not aware of a case where we need it. In practice it's more important to intelligently prune the search space of nontrivial loops before running the solver, otherwise the solver is often forced to prune the most optimal solutions. Hiding the chained users does this well, so that LSR is more likely to find the best IV for the chain as a whole. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147801 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-09Adding collection of IV chains to LSR.Andrew Trick
This collects a set of IV uses within the loop whose values can be computed relative to each other in a sequence. Following checkins will make use of this information. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147797 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-09"Minor LSR debugging stuff"Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147785 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-09Move assert to the right place.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147779 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-09InstCombine: Teach foldLogOpOfMaskedICmpsHelper that sign bit tests are bit ↵Benjamin Kramer
tests. This subsumes several other transforms while enabling us to catch more cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147777 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-08Tweak my last commit to be less conservative about uses.Benjamin Kramer
We still save an instruction when just the "and" part is replaced. Also change the code to match comments more closely. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147753 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-08InstCombine: If we have a bit test and a sign test anded/ored together, ↵Benjamin Kramer
merge the sign bit into the bit test. This is common in bit field code, e.g. checking if the first or the last bit of a bit field is set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147749 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07Enable redundant phi elimination after LSR.Andrew Trick
This will be more important as we extend the LSR pass in ways that don't rely on the formula solver. In particular, we need it for constructing IV chains. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147724 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07LSR: Don't optimize loops if an outer loop has no preheader.Andrew Trick
LoopSimplify may not run on some outer loops, e.g. because of indirect branches. SCEVExpander simply cannot handle outer loops with no preheaders. Fixes rdar://10655343 SCEVExpander segfault. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147718 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07LSR: run DeleteDeadPhis before replaceCongruentPhis.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147711 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07Extended replaceCongruentPhis to handle mixed phi types.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147707 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-06[asan] cleanup: remove the SIGILL-related code (compiler part)Kostya Serebryany
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147667 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-05Fix SpeculativelyExecuteBB to either speculate all or none of the phisDan Gohman
present in the bottom of the CFG triangle, as the transformation isn't ever valuable if the branch can't be eliminated. Also, unify some heuristics between SimplifyCFG's multiple if-converters, for consistency. This fixes rdar://10627242. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147630 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-05PR11705, part 2: globalopt shouldn't put inttoptr/ptrtoint operations into ↵Eli Friedman
global initializers if there's an implied extension or truncation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147625 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-05Revert r56315. When the instruction to speculate is a load, thisDan Gohman
code can incorrectly move the load across a store. This never happens in practice today, but only because the current heuristics accidentally preclude it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147623 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-05SCCCaptured is trivially false on entry to this loop and not modified inside it.Nick Lewycky
Eliminate the dead test for it on each loop iteration. No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147616 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-04Remove pointless asserts.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147529 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-04Teach instcombine all sorts of great stuff about shifts that have exact, nuw orNick Lewycky
nsw bits on them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147528 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-31Make use of the exact bit when optimizing '(X >>exact 3) << 1' to eliminate theNick Lewycky
'and' that would zero out the trailing bits, and to produce an exact shift ourselves. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147391 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-28Change CaptureTracking to pass a Use* instead of a Value* when a value isNick Lewycky
captured. This allows the tracker to look at the specific use, which may be especially interesting for function calls. Use this to fix 'nocapture' deduction in FunctionAttrs. The existing one does not iterate until a fixpoint and does not guarantee that it produces the same result regardless of iteration order. The new implementation builds up a graph of how arguments are passed from function to function, and uses a bottom-up walk on the argument-SCCs to assign nocapture. This gets us nocapture more often, and does so rather efficiently and independent of iteration order. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147327 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-28Demystify this comment.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147307 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-27Use false not zero, as a bool.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147292 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-27Turn cos(-x) into cos(x). Patch by Alexander Malyshev!Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147291 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-27Teach simplifycfg to recompute branch weights when merging some branches, andNick Lewycky
to discard weights when appropriate. Still more to do (and a new TODO), but it's a start! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147286 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-26Fix warning.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147284 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-26Update the branch weight metadata when reversing the order of a branch.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147280 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-26Sort includes, canonicalize whitespace, fix typos. No functionality change.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147279 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-24InstCombine: Add a combine that turns (2^n)-1 ^ x back into (2^n)-1 - x iff ↵Benjamin Kramer
x is smaller than 2^n and it fuses with a following add. This was intended to undo the sub canonicalization in cases where it's not profitable, but it also finds some cases on it's own. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147256 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-24InstCombine: Canonicalize (2^n)-1 - x into (2^n)-1 ^ x iff x is known to be ↵Benjamin Kramer
smaller than 2^n. This has the obvious advantage of being commutable and is always a win on x86 because const - x wastes a register there. On less weird architectures this may lead to a regression because other arithmetic doesn't fuse with it anymore. I'll address that problem in a followup. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147254 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-23Fix typo "infinte".Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147226 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-23When not destroying the source, the linker is not remapping the types. Added ↵Mon P Wang
support to CloneFunctionInto to allow remapping for this case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147217 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-22Add the actual code for r147175.Chad Rosier
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147176 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-22Speculatively revert r146578 to determine if it is the cause of a number ofChad Rosier
performance regressions (both execution-time and compile-time) on our nightly testers. Original commit message: Fix for bug #11429: Wrong behaviour for switches. Small improvement for code size heuristics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147131 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-21Fix a copy+pasto. No testcase, because the symptoms of dereferencingDan Gohman
an invalid iterator aren't reproducible. rdar://10614085. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147098 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-21Make some intrinsics safe to speculatively execute.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147036 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-20Unweaken vtables as per ↵David Blaikie
http://llvm.org/docs/CodingStandards.html#ll_virtual_anch git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146960 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-18- Use getExitingBlock instead of getExitingBlocks.Jakub Staszak
- Remove trailing spaces. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146854 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-17Revert r146822 at Pete Cooper's request as it broke clang self hosting.Kevin Enderby
Hope I did this correctly :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146834 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-17SimplifyCFG now predicts some conditional branches to true or false ↵Pete Cooper
depending on previous branch on same comparison operands. For example, if (a == b) { if (a > b) // this is false Fixes some of the issues on <rdar://problem/10554090> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146822 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-17Refactor code used in InstCombine::FoldAndOfICmps to new file.Pete Cooper
This will be used by SimplifyCfg in a later commit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146803 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-17The powers that be have decided that LLVM IR should now support 16-bitDan Gohman
"half precision" floating-point with a first-class type. This patch adds basic IR support (but not codegen support). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146786 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-16Avoid a confusing assert for silly options: -unroll-runtime -unroll-count=1.Andrew Trick
No need for an explicit test case for an unsupported combination of options. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146721 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-15[asan] add the name of the module to the description of a global variable. ↵Kostya Serebryany
This improves the readability of global-buffer-overflow reports. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146698 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-15[asan] fix a bug (issue 19) where dlclose and the following mmap caused a ↵Kostya Serebryany
false positive. compiler part. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146688 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-15Added InstCombine for "select cond, ~cond, x" type patternsPete Cooper
These can be reduced to "~cond & x" or "~cond | x" git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146624 91177308-0d34-0410-b5e6-96231b3b80d8
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