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2009-06-20Tweak this test to be a little less unusual.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73808 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-19Don't (unconditionally) use getSCEVAtScope to simplify the stepDan Gohman
expression in IVUsers, because in the case of a use of a non-linear addrec outside of a loop, this causes the addrec to be evaluated as a linear addrec. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73774 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-27Revert 72493 and replace it with a more conservative fix, for now: don'tDan Gohman
rewrite the comparison if there is any implicit extension or truncation on the induction variable. I'm planning for IVUsers to eventually take over some of the work of this code, and for it to be generalized. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72496 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-27In ChangeCompareStride, when the stride to be reused is truncated toDan Gohman
a smaller type, promoted its offset back up to the type of the new comparison. This fixes PR4222. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72493 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
2009-05-12Factor 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
2009-05-05Temporarily 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
2009-05-02Previously, 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
2009-04-27Teach 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
2009-04-23Testcase for PR2537.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69866 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
2009-02-20Implement "superhero" strength reduction, or full strengthDan Gohman
reduction of address calculations down to basic pointer arithmetic. This is currently off by default, as it needs a few other features before it becomes generally useful. And even when enabled, full strength reduction is only performed when it doesn't increase register pressure, and when several other conditions are true. This also factors out a bunch of exisiting LSR code out of StrengthReduceStridedIVUsers into separate functions, and tidies up IV insertion. This actually decreases register pressure even in non-superhero mode. The change in iv-users-in-other-loops.ll is an example of this; there are two more adds because there are two fewer leas, and there is less spilling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65108 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-17Strengthen the "non-constant stride must dominate loop preheader" check.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64703 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-15Fix pr3571: If stride is a value defined by an instruction, make sure it ↵Evan Cheng
dominates the loop preheader. When IV users are strength reduced, the stride is inserted into the preheader. It could create a use before def situation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64579 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-09Fix PR 3471, and some cleanups.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64177 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-14Fix the time regression I introduced in 464.h264ref withDale Johannesen
my earlier patch to this file. The issue there was that all uses of an IV inside a loop are actually references to Base[IV*2], and there was one use outside that was the same but LSR didn't see the base or the scaling because it didn't recurse into uses outside the loop; thus, it used base+IV*scale mode inside the loop instead of pulling base out of the loop. This was extra bad because register pressure later forced both base and IV into memory. Doing that recursion, at least enough to figure out addressing modes, is a good idea in general; the change in AddUsersIfInteresting does this. However, there were side effects.... It is also possible for recursing outside the loop to introduce another IV where there was only 1 before (if the refs inside are not scaled and the ref outside is). I don't think this is a common case, but it's in the testsuite. It is right to be very aggressive about getting rid of such introduced IVs (CheckForIVReuse and the handling of nonzero RewriteFactor in StrengthReduceStridedIVUsers). In the testcase in question the new IV produced this way has both a nonconstant stride and a nonzero base, neither of which was handled before. And when inserting new code that feeds into a PHI, it's right to put such code at the original location rather than in the PHI's immediate predecessor(s) when the original location is outside the loop (a case that couldn't happen before) (RewriteInstructionToUseNewBase); better to avoid making multiple copies of it in this case. Also, the mechanism for keeping SCEV's corresponding to GEP's no longer works, as the GEP might change after its SCEV is remembered, invalidating the SCEV, and we might get a bad SCEV value when looking up the GEP again for a later loop. This also couldn't happen before, as we weren't recursing into GEP's outside the loop. Also, when we build an expression that involves a (possibly non-affine) IV from a different loop as well as an IV from the one we're interested in (containsAddRecFromDifferentLoop), don't recurse into that. We can't do much with it and will get in trouble if we try to create new non-affine IVs or something. More testcases are coming. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62212 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-09Remove. Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56018 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-09fix overflow check.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56011 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-08xfailDevang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55914 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-03Check iteration count.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55680 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-02If all IV uses are extending integer IV then change the type of IV itself, ↵Devang Patel
if possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55674 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-26If IV is used in a int-to-float cast inside the loop then try to eliminate ↵Devang Patel
the cast operation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55374 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-18XFAIL this test for now.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54929 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-17Didn't mean to change this.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54904 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-17Fix a (u)comiss intrinsic lowering bug. It was using anyext which can return ↵Evan Cheng
junk in higher bits. Patch by Nate Begeman. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54903 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-15Reapply 54786. Add overflow and number of mantissa bits checks.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54821 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-15Revert 54786. It's not checking for overflows, etc.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54813 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-14If IV is used in a int-to-float cast inside the loop then try to eliminate ↵Devang Patel
the cast opeation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54786 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-13Check sign to detect overflow before changing compare stride.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54710 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-06PR2535, not PR2355.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54416 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-06Fix PR2355: bug in ChangeCompareStride. When the loop termination compare is ↵Evan Cheng
the only use of its iv stride, the stride can be eliminated by moving it to another stride. If the scale is negative, swap the predicate instead of using a inverse predicate. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54415 91177308-0d34-0410-b5e6-96231b3b80d8
2008-07-21Add the PR number to the test.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53880 91177308-0d34-0410-b5e6-96231b3b80d8
2008-07-21Fix a bug in LSR's dead-PHI cleanup. If a PHI has a def-use chain thatDan Gohman
leads into a cycle involving a different PHI, LSR got stuck running around that cycle looking for the original PHI. To avoid this, keep track of visited PHIs and stop searching if we see one more than once. This fixes PR2570. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53879 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-22Improve LSR's dead-phi detection to handle use-def cyclesDan Gohman
with more than two nodes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52617 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-16Refine the change in r52258 for avoiding use-before-def conditionsDan Gohman
when changing the stride of a comparison so that it's slightly more precise, by having it scan the instruction list to determine if there is a use of the condition after the point where the condition will be inserted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52371 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-13Protect ChangeCompareStride from situations in which it is possibleDan Gohman
for it to generate use-before-def IR, such as in this testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52258 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-20sabre brings to my attention that the 'tr' suffix is also obsoleteGabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51349 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-20Rename the last test with .llx extension to .ll, resolve duplicate test by ↵Gabor Greif
renaming to isnan2. Now that no test has llx ending there is no need to search for them from dg.exp too. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51328 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-01Update old-style syntax in some "not grep" tests.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50560 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-19Upgrade tests.Tanya Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48538 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-15Convert tests using "| wc -l | grep ..." to use the count script.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41097 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-29Convert .cvsignore filesJohn Criswell
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37801 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-23New test.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36379 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-16For PR1319:Reid Spencer
Remove && from the end of the lines to prevent tests from throwing run lines into the background. Also, clean up places where the same command is run multiple times by using a temporary file. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36142 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-16For PR1319:Reid Spencer
Fix syntax of tests to ensure grep pattern is properly quoted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36134 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-15For PR1319:Reid Spencer
Upgrade to use new Tcl exec based test harness. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36062 91177308-0d34-0410-b5e6-96231b3b80d8
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