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path: root/lib/Analysis/ScalarEvolution.cpp
AgeCommit message (Collapse)Author
2012-01-24switch SCEV to use the new ConstantFoldLoadThroughGEPIndices functionChris Lattner
instead of its own hard coded thing, allowing it to handle ConstantDataSequential and fixing some obscure bugs (e.g. it would previously crash on a CAZ of vector type). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148788 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-20More dead code removal (using -Wunreachable-code)David Blaikie
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148578 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-20Remove obviously invalid early exit that prevented analyzing ↵Benjamin Kramer
ConstantAggregateZeros. Found by the clang static analyzer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148540 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-11Clarified the SCEV getSmallConstantTripCount interface with in-your-face ↵Andrew Trick
comments. This interface is misleading and dangerous, but it is actually what we need for unrolling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147926 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07Expose isNonConstantNegative to users of ScalarEvolution.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147700 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-02Fix a few more places where TargetData/TargetLibraryInfo is not being passed.Chad Rosier
Add FIXMEs to places that are non-trivial to fix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145661 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-01Last bit of TargetLibraryInfo propagation. Also fixed a case for TargetDataChad Rosier
where it appeared beneficial to pass. More of rdar://10500969 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145630 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-01Propagate TargetLibraryInfo throughout ConstantFolding.cpp and Chad Rosier
InstructionSimplify.cpp. Other fixups as needed. Part of rdar://10500969 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145559 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-29SCEV fix. In general, Add/Mul expressions should not inherit NSW/NUW.Andrew Trick
This reverts r139450, fixes r139453, and adds much needed comments and a unit test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145367 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-29Make SCEV print <nsw><nuw> for Add/MulExpr.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145364 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-20SCEV: Actually set overflow flags on add expressions.Benjamin Kramer
setFlags doesn't modify its arguments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145007 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-16Fix SCEV overly optimistic back edge taken count for multi-exit loops.Andrew Trick
Fixes PR11375: Different results for 'clang++ huh.cpp'... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144746 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-12Don't try to loop on iterators that are potentially invalidated inside the ↵Nick Lewycky
loop. Fixes PR11361! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144454 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-09Don't forget to check FlagNW when determining whether an AddRecExpr will wrapNick Lewycky
or not. Patch by Brendon Cahoon! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144173 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-25Restore commits 142790 and 142843 - they weren't breaking the buildDuncan Sands
bots. Original commit messages: - Reapply r142781 with fix. Original message: Enhance SCEV's brute force loop analysis to handle multiple PHI nodes in the loop header when computing the trip count. With this, we now constant evaluate: struct ListNode { const struct ListNode *next; int i; }; static const struct ListNode node1 = {0, 1}; static const struct ListNode node2 = {&node1, 2}; static const struct ListNode node3 = {&node2, 3}; int test() { int sum = 0; for (const struct ListNode *n = &node3; n != 0; n = n->next) sum += n->i; return sum; } - Now that we look at all the header PHIs, we need to consider all the header PHIs when deciding that the loop has stopped evolving. Fixes miscompile in the gcc torture testsuite! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142919 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-25Speculatively revert commits 142790 and 142843 to see if it fixesDuncan Sands
the dragonegg and llvm-gcc self-host buildbots. Original commit messages: - Reapply r142781 with fix. Original message: Enhance SCEV's brute force loop analysis to handle multiple PHI nodes in the loop header when computing the trip count. With this, we now constant evaluate: struct ListNode { const struct ListNode *next; int i; }; static const struct ListNode node1 = {0, 1}; static const struct ListNode node2 = {&node1, 2}; static const struct ListNode node3 = {&node2, 3}; int test() { int sum = 0; for (const struct ListNode *n = &node3; n != 0; n = n->next) sum += n->i; return sum; } - Now that we look at all the header PHIs, we need to consider all the header PHIs when deciding that the loop has stopped evolving. Fixes miscompile in the gcc torture testsuite! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142916 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-24Now that we look at all the header PHIs, we need to consider all the header PHIsNick Lewycky
when deciding that the loop has stopped evolving. Fixes miscompile in the gcc torture testsuite! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142843 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-24Reapply r142781 with fix. Original message:Nick Lewycky
Enhance SCEV's brute force loop analysis to handle multiple PHI nodes in the loop header when computing the trip count. With this, we now constant evaluate: struct ListNode { const struct ListNode *next; int i; }; static const struct ListNode node1 = {0, 1}; static const struct ListNode node2 = {&node1, 2}; static const struct ListNode node3 = {&node2, 3}; int test() { int sum = 0; for (const struct ListNode *n = &node3; n != 0; n = n->next) sum += n->i; return sum; } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142790 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-24PHI nodes not in the loop header aren't part of the loop iteration initialNick Lewycky
state. Furthermore, they might not have two operands. This fixes the underlying issue behind the crashes introduced in r142781. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142788 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-24Speculatively revert r142781. Bots are showingNick Lewycky
Assertion `i_nocapture < OperandTraits<PHINode>::operands(this) && "getOperand() out of range!"' failed. coming out of indvars. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142786 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-23Enhance SCEV's brute force loop analysis to handle multiple PHI nodes in theNick Lewycky
loop header when computing the trip count. With this, we now constant evaluate: struct ListNode { const struct ListNode *next; int i; }; static const struct ListNode node1 = {0, 1}; static const struct ListNode node2 = {&node1, 2}; static const struct ListNode node3 = {&node2, 3}; int test() { int sum = 0; for (const struct ListNode *n = &node3; n != 0; n = n->next) sum += n->i; return sum; } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142781 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-22Make SCEV's brute force analysis stronger in two ways. Firstly, we should beNick Lewycky
able to constant fold load instructions where the argument is a constant. Second, we should be able to watch multiple PHI nodes through the loop; this patch only supports PHIs in loop headers, more can be done here. With this patch, we now constant evaluate: static const int arr[] = {1, 2, 3, 4, 5}; int test() { int sum = 0; for (int i = 0; i < 5; ++i) sum += arr[i]; return sum; } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142731 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-14An instruction's operands aren't necessarily instructions or constants. TheyNick Lewycky
could be arguments, for example. No testcase because this is a bug-fix broken out of a larger optimization patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141951 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-05Fixes PR11070 - assert in SCEV getConstantEvolvingPHIOperands.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141219 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-05Typo. Thanks Bob.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141188 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-05Fix a broken assert found by -Wparentheses.Chandler Carruth
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141168 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-05Fix disabled SCEV analysis caused r141161 and add unit test.Andrew Trick
I noticed during self-review that my previous checkin disabled some analysis. Even with the reenabled analysis the test case runs in about 5ms. Without the fix, it will take several minutes at least. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141164 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-05Avoid exponential recursion in SCEV getConstantEvolvingPHI and ↵Andrew Trick
EvaluateExpression. Note to compiler writers: never recurse on multiple instruction operands without memoization. Fixes rdar://10187945. Was taking 45s, now taking 5ms. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141161 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-04The product of two chrec's can always be represented as a chrec.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141066 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-03Reapply r140979 with fix! We never did get a testcase, but careful review of theNick Lewycky
logic by David Meyer revealed this bug. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140992 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-03Revert r140979 due to reports of bootstrap failure.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140980 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-03Add one more case we compute a max trip count.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140979 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-28indvars: generalize SCEV getPreStartForSignExtend.Andrew Trick
Handle general Add expressions to avoid leaving around redundant 32-bit IVs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140701 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-10Set NSW/NUW flags on SCEVAddExpr when the operation is flagged asAndrew Trick
such. I'm doing this now for completeness because I can't think of/remember any reason that it was left out. I'm not sure it will help anything, but if we don't do it we need to explain why in comments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139450 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06This transform only handles two-operand AddRec's. Prevent it from trying toNick Lewycky
handle anything more complex. Fixes PR10383 again! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139186 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06Fix typo in comment again.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139139 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06Apparently we compile the code, not the comments. Thanks Eli!Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139138 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06Fix typo in comment.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139137 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06Nope! I had it right the first time. Revert the operative part of r139135 andNick Lewycky
add more showing of my work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139136 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06Fix flipped sign. While there, show my math.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139135 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06No no no, fix typo properly!Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139134 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06The logic inside getMulExpr to simplify {a,+,b}*{c,+,d} was wrong, which wasNick Lewycky
visible given a=b=c=d=1, on iteration #1 (the second iteration). Replace it with correct math. Fixes PR10383! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139133 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06Revert r139126 due to selfhost failures reported by buildbots.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139130 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-05Teach SCEV to report a max backedge count in one interesting case inNick Lewycky
HowFarToZero; the case for a canonical loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139126 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-02Comment and clarifying assert.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139036 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-11Allow loop unrolling to get known trip counts from ScalarEvolution.Andrew Trick
SCEV unrolling can unroll loops with arbitrary induction variables. It is a prerequisite for -disable-iv-rewrite performance. It is also easily handles loops of arbitrary structure including multiple exits and is generally more robust. This is under a temporary option to avoid affecting default behavior for the next couple of weeks. It is needed so that I can checkin unit tests for updateUnloop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137384 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-06Made SCEV's UDiv expressions more canonical. When dividing aAndrew Trick
recurrence, the initial values low bits can sometimes be ignored. To take advantage of this, added FoldIVUser to IndVarSimplify to fold an IV operand into a udiv/lshr if the operator doesn't affect the result. -indvars -disable-iv-rewrite now transforms i = phi i4 i1 = i0 + 1 idx = i1 >> (2 or more) i4 = i + 4 into i = phi i4 idx = i0 >> ... i4 = i + 4 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137013 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-02Use consistent terminology for loop exit/exiting blocks. Name change only.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136677 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-26SCEV: Added a data structure for storing not-taken info per loopAndrew Trick
exit. Added an interfaces for querying either the loop's exact/max backedge taken count or a specific loop exit's not-taken count. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136100 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-19Use ArrayRef in ConstantFoldInstOperands and ConstantFoldCall.Jay Foad
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135477 91177308-0d34-0410-b5e6-96231b3b80d8
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