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2009-05-21Teach ValueTracking a new way to analyze PHI nodes, and and teachDan Gohman
Instcombine to be more aggressive about using SimplifyDemandedBits on shift nodes. This allows a shift to be simplified to zero in the included test case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72204 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-20Suppress the IV reversal transformation in the case that the RHSDan Gohman
of the comparison is defined inside the loop. This fixes a use-before-def problem, because the transformation puts a use of the RHS outside the loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72149 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-19Teach SCEVExpander to expand arithmetic involving pointers into GEPDan Gohman
instructions. It attempts to create high-level multi-operand GEPs, though in cases where this isn't possible it falls back to casting the pointer to i8* and emitting a GEP with that. Using GEP instructions instead of ptrtoint+arithmetic+inttoptr helps pointer analyses that don't use ScalarEvolution, such as BasicAliasAnalysis. Also, make the AddrModeMatcher more aggressive in handling GEPs. Previously it assumed that operand 0 of a GEP would require a register in almost all cases. It now does extra checking and can do more matching if operand 0 of the GEP is foldable. This fixes a problem that was exposed by SCEVExpander using GEPs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72093 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-18Add nounwind to a few tests.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72002 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-13Testcase for 71688.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71691 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-13calls in nothrow functions can be marked nothrow even if the calleeChris Lattner
is not known to be nothrow. This allows readnone/readonly functions to be deleted even if we don't know whether the callee can throw. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71676 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-13Fix PR4206 - crash in simplify lib callsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71644 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-12Factor the code for collecting IV users out of LSR into an IVUsers class,Dan Gohman
and generalize it so that it can be used by IndVarSimplify. Implement the base IndVarSimplify transformation code using IVUsers. This removes TestOrigIVForWrap and associated code, as ScalarEvolution now has enough builtin overflow detection and folding logic to handle all the same cases, and more. Run "opt -iv-users -analyze -disable-output" on your favorite loop for an example of what IVUsers does. This lets IndVarSimplify eliminate IV casts and compute trip counts in more cases. Also, this happens to finally fix the remaining testcases in PR1301. Now that IndVarSimplify is being more aggressive, it occasionally runs into the problem where ScalarEvolutionExpander's code for avoiding duplicate expansions makes it difficult to ensure that all expanded instructions dominate all the instructions that will use them. As a temporary measure, IndVarSimplify now uses a FixUsesBeforeDefs function to fix up instructions inserted by SCEVExpander. Fortunately, this code is contained, and can be easily removed once a more comprehensive solution is available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71535 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-12When forgetting SCEVs for loop PHIs, don't forget SCEVUnknown values.Dan Gohman
These values aren't analyzable, so they don't care if more information about the loop trip count can be had. Also, SCEVUnknown is used for a PHI while the PHI itself is being analyzed, so it needs to be left in the Scalars map. This fixes a variety of subtle issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71533 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-08fix RewriteStoreUserOfWholeAlloca to use the correct type sizeChris Lattner
method, fixing a crash on PR4146. While the store will ultimately overwrite the "padded size" number of bits in memory, the stored value may be a subset of this size. This function only wants to handle the case where all bits are stored. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71224 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-08PR4123: don't crash when inlining a call which uses its own result.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71199 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-07Revert 71165. It did more than just revert 71158 and it introducedDan Gohman
several regressions. The problem due to 71158 is now fixed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71176 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-07Revert r70876 and add a testcase (@c7) showing the problem:Duncan Sands
bits captured, but the pointer marked nocapture. In fact I now recall that this problem is why only readnone functions returning void were considered before! However keep a small fix that was also in r70876: a readnone function returning void can result in bits being captured if it unwinds, so test for this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71168 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-07Temporarily revert r71158. It was causing a failure during a full bootstrap:Bill Wendling
checking for bcopy... no checking for getc_unlocked... Assertion failed: (0 && "Unknown SCEV kind!"), function operator(), file /Volumes/Sandbox/Buildbot/llvm/full-llvm/build/llvmCore.roots/llvmCore~obj/src/lib/Analysis/ScalarEvolution.cpp, line 511. /Volumes/Sandbox/Buildbot/llvm/full-llvm/build/llvmgcc42.roots/llvmgcc42~obj/src/libdecnumber/decUtility.c:360: internal compiler error: Abort trap Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://developer.apple.com/bugreporter> for instructions. make[4]: *** [decUtility.o] Error 1 make[4]: *** Waiting for unfinished jobs.... Assertion failed: (0 && "Unknown SCEV kind!"), function operator(), file /Volumes/Sandbox/Buildbot/llvm/full-llvm/build/llvmCore.roots/llvmCore~obj/src/lib/Analysis/ScalarEvolution.cpp, line 511. /Volumes/Sandbox/Buildbot/llvm/full-llvm/build/llvmgcc42.roots/llvmgcc42~obj/src/libdecnumber/decNumber.c:5591: internal compiler error: Abort trap Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://developer.apple.com/bugreporter> for instructions. make[4]: *** [decNumber.o] Error 1 make[3]: *** [all-stage2-libdecnumber] Error 2 make[3]: *** Waiting for unfinished jobs.... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71165 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-07Constant-fold ptrtoint+add+inttoptr to gep when the pointer is anDan Gohman
array and the add is within range. This helps simplify expressions expanded by ScalarEvolutionExpander. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71158 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-06Fix PR3754: don't mark functions that wrap MallocInst withDuncan Sands
the readnone. Since MallocInst is scheduled for deletion it doesn't seem worth doing anything more subtle, such as having mayWriteToMemory return true for MallocInst. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71077 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-06Allow readonly functions to unwind exceptions. TeachDuncan Sands
the optimizers about this. For example, a readonly function with no uses cannot be removed unless it is also marked nounwind. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71071 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-05Temporarily reverting r71008. It was causing this failure:Bill Wendling
Running /Volumes/Sandbox/Buildbot/llvm/full-llvm/build/llvm.src/test/ CodeGen/X86/dg.exp ... FAIL: /Volumes/Sandbox/Buildbot/llvm/full-llvm/build/llvm.src/test/ CodeGen/X86/change-compare-stride-1.ll Failed with exit(1) at line 2 while running: grep {cmpq $-478,} change-compare-stride-1.ll.tmp child process exited abnormally git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71013 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-05Handle overflow of 64-bit loop conditions.David Greene
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71008 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-04Restore minor deletion.Mike Stump
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70892 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-02Previously, RecursivelyDeleteDeadInstructions provided an optionDan Gohman
of returning a list of pointers to Values that are deleted. This was unsafe, because the pointers in the list are, by nature of what RecursivelyDeleteDeadInstructions does, always dangling. Replace this with a simple callback mechanism. This may eventually be removed if all clients can reasonably be expected to use CallbackVH. Use this to factor out the dead-phi-cycle-elimination code from LSR utility function, and generalize it to use the RecursivelyDeleteTriviallyDeadInstructions utility function. This makes LSR more aggressive about eliminating dead PHI cycles; adjust tests to either be less trivial or to simply expect fewer instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70636 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-30Don't try to mix integers and pointers in an icmp instructionDan Gohman
in getSCEVAtScope. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70495 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-29Fix recent regression in gcc.dg/pr26719.c (6835035).Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70386 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-28As with r70333, give the primary induction variable a use soDan Gohman
that it can't be trivially eliminated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70334 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-28Make this testcase slightly less trivial, so that it doesn't failDan Gohman
if indvars happens to optimize away the unused primary induction variable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70333 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-27Fix PR 4086, a bug in FP IV elimination.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70247 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-27Teach getZeroExtendExpr and getSignExtendExpr to use trip-countDan Gohman
information to simplify [sz]ext({a,+,b}) to {zext(a),+,[zs]ext(b)}, as appropriate. These functions and the trip count code each call into the other, so this requires careful handling to avoid infinite recursion. During the initial trip count computation, conservative SCEVs are used, which are subsequently discarded once the trip count is actually known. Among other benefits, this change lets LSR automatically eliminate some unnecessary zext-inreg and sext-inreg operation where the operand is an induction variable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70241 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-27Handle ands with ~0 correctly too. This fixes PR4052.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70176 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-25Add several more icmp simplifications. Transform signed comparisonsDan Gohman
into unsigned ones when the operands are known to have the same sign bit value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70053 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-25Handle ands with 0 and shifts by 0 correctly. These aren'tDan Gohman
common, but indvars shouldn't crash on them. This fixes PR4054. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70051 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-23Fix an error in this test.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69893 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-23Change SCEVExpander's expandCodeFor to provide more flexibilityDan Gohman
with the persistent insertion point, and change IndVars to make use of it. This fixes a bug where IndVars was holding on to a stale insertion point and forcing the SCEVExpander to continue to use it. This fixes PR4038. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69892 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-23Testcase for PR2639.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69867 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-23Testcase for PR2537.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69866 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-23Fix typo.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69865 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-23Testcase for PR3085.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69863 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-23Add testcase from PR3086.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69862 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-22Make sure both operands have binary instructions have the same type.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69844 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-22Avoid deferencing use_begin() if value does not have a use.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69836 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-22SCEVExpander's InsertCastOfTo knows how to move existing castDan Gohman
instructions in order to avoid inserting new ones. However, if the cast instruction is the SCEVExpander's InsertPt, this causes subsequently emitted instructions to be inserted near the cast, and not at the location of the original insert point. Fix this by adjusting the insert point in such cases. This fixes PR4009. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69808 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-21fix a crash on a pointless but valid zero-length memset, rdar://6808691Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69680 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-16Another testcase for IV shortening.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69247 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-15Enhance induction variable code to remove theDale Johannesen
sext around sext(shorter IV + constant), using a longer IV instead, when it can figure out the add can't overflow. This comes up a lot in subscripting; mainly affects 64 bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69123 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-15While inlining, clone llvm.dbg.func.start intrinsic and adjust Devang Patel
llvm.dbg.region.end instrinsic. This nested llvm.dbg.func.start/llvm.dbg.region.end pair now enables DW_TAG_inlined_subroutine support in code generator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69118 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-14Optimize conditional branch on i1 phis with non-constant inputs.Evan Cheng
This turns: eq: %3 = icmp eq i32 %1, %2 br label %join ne: %4 = icmp ne i32 %1, %2 br label %join join: %5 = phi i1 [%3, %eq], [%4, %ne] br i1 %5, label %yes, label %no => eq: %3 = icmp eq i32 %1, %2 br i1 %3, label %yes, label %no ne: %4 = icmp ne i32 %1, %2 br i1 %4, label %yes, label %no git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69102 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-13Add a new "available_externally" linkage type. This is intendedChris Lattner
to support C99 inline, GNU extern inline, etc. Related bugzilla's include PR3517, PR3100, & PR2933. Nothing uses this yet, but it appears to work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68940 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-12add some optimizations for strncpy/strncat and factor someChris Lattner
code. Patch by Benjamin Kramer! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68885 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-08Instcombine should not promote whole computation trees to "strange"Chris Lattner
integer types, unless they are already strange. This prevents it from turning the code produced by SROA into crazy libcalls and stuff that the code generator can't handle. In the attached example, the result was an i96 multiply that caused the x86 backend to assert. Note that if TargetData had an idea of what the legal types are for a target that this could be used to stop instcombine from introducing i64 muls, as Scott wanted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68598 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-07fix rdar://6762290, a crash compiling cxx filt with clang.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68500 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-06Let the strcat optimizer return the pointer to the start of the buffer,Ed Schouten
instead of the place where it started to perform the string copy. - PR3661 - Patch by Benjamin Kramer! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68443 91177308-0d34-0410-b5e6-96231b3b80d8
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