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2013-04-30TBAA: remove !tbaa from testing cases if not used.Manman Ren
This will make it easier to turn on struct-path aware TBAA since the metadata format will change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180796 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-01Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ↵Dmitri Gribenko
ModuleID This is done to avoid odd test failures, like the one fixed in r171243. My previous regex was not good enough to find these. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171343 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-30Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ↵Dmitri Gribenko
ModuleID This is done to avoid odd test failures, like the one fixed in r171243. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171246 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-25Make this test check the transforms it's actually doing. Also add a test that itNick Lewycky
doesn't transform the trivially unsafe case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164617 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-25Don't forget that strcpy and friends return a pointer to the destination, soNick Lewycky
it's not a dead store if that pointer is used. Whoops! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164583 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-24Teach DSE that strcpy, strncpy, strcat and strncat are all stores which may beNick Lewycky
dead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164561 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-03Fix more fallout from r158919, similar to PR13547.Bob Wilson
This code used to only handle malloc-like calls, which do not read memory. r158919 changed it to check isNoAliasFn(), which includes strdup-like and realloc-like calls, but it was not checking for dependencies on the memory read by those calls. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163106 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-14Change greater than to greater than or equal so that an identical sized ↵Craig Topper
store to the same offset is treated as completing overwriting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161857 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-08isAllocLikeFn is allowed to return true for functions which read memory; makeEli Friedman
sure we account for that correctly in DeadStoreElimination. Fixes a regression from r158919. PR13547. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161468 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-10Teach DeadStoreElimination to eliminate exit-block stores with phi addresses.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156558 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-10teach DSE and isInstructionTriviallyDead() about callocNuno Lopes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156553 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-28Reverted r152620 - DSE: Shorten memset when a later store overwrites the ↵Pete Cooper
start of it. There were all sorts of buildbot issues git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151621 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-28DSE: Shorten memset when a later store overwrites the start of itPete Cooper
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151620 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-26Add testcase for the previous commit.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151475 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-16Replace all instances of dg.exp file with lit.local.cfg, since all tests are ↵Eli Bendersky
run with LIT now and now Dejagnu. dg.exp is no longer needed. Patch reviewed by Daniel Dunbar. It will be followed by additional cleanup patches. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150664 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-08Fix infinite loop in DSE when deleting a free in a reachable loop that's alsoNick Lewycky
trivially infinite. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-03Fixed deadstoreelimination bug where negative indices were incorrectly ↵Pete Cooper
causing the optimisation to occur Turns out long long + unsigned long long is unsigned. Doh! Fixes http://llvm.org/bugs/show_bug.cgi?id=11455 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145731 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-16Fix typo in test.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144774 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-16Merge isObjectPointerWithTrustworthySize with getPointerSize. Use it whenNick Lewycky
looking at the size of the pointee. Fixes PR11390! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144773 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-09DeadStoreElimination can now trim the size of a store if the end of the ↵Pete Cooper
store is dead. Currently checks alignment and killing stores on a power of 2 boundary as this is likely to trim the size of the earlier store without breaking large vector stores into scalar ones. Fixes <rdar://problem/10140300> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144239 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-05Do simple cross-block DSE when we encounter a free statement. Fixes PR11240.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143808 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-04Speculatively revert "DeadStoreElimination can now trim the size of a store ifDaniel Dunbar
the end of it is dead.", which appears to break bootstrapping LLVM. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143668 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-03DeadStoreElimination can now trim the size of a store if the end of it is dead.Pete Cooper
Only currently done if the later store is writing to a power of 2 address or has the same alignment as the earlier store as then its likely to not break up large stores into smaller ones Fixes <rdar://problem/10140300> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143630 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-24A dead malloc, a free(NULL) and a free(undef) are all trivially deadNick Lewycky
instructions. This doesn't introduce any optimizations we weren't doing before (except potentially due to pass ordering issues), now passes will eliminate them sooner as part of their own cleanups. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142787 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-22A non-escaping malloc in the entry block is not unlike an alloca. Do dead-storeNick Lewycky
elimination on them too. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142735 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06Try again at r138809 (make DSE more aggressive in removing dead stores at ↵Owen Anderson
the end of a function), now with less deleting stores before memcpy's. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139150 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-30Remove empty file.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138830 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-30Speculatively revert r138809 in an attempt to fix DragonEgg.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138829 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-30When walking backwards to eliminate final stores to allocas at the end of a ↵Owen Anderson
function, encountering an unrelated store should not cause us to give up like encountering a load does. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138809 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-17Atomic load/store handling for the passes using memdep (GVN, DSE, memcpyopt).Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137888 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-12Move "atomic" and "volatile" designations on instructions after the opcodeEli Friedman
of the instruction. Note that this change affects the existing non-atomic load and store instructions; the parser now accepts both forms, and the change is noted in the release notes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137527 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-18rip out a ton of intrinsic modernization logic from AutoUpgrade.cpp, which isChris Lattner
for pre-2.9 bitcode files. We keep x86 unaligned loads, movnt, crc32, and the target indep prefetch change. As usual, updating the testsuite is a PITA. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133337 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-17manually upgrade a bunch of tests to modern syntax, and remove some thatChris Lattner
are either unreduced or only test old syntax. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133228 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-23fix a really nasty basicaa mod/ref calculation bug that was causing ↵Chris Lattner
miscompilation of UnitTests/ObjC/messages-2.m with the recent optimizer improvements. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131897 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30* The DSE code that tested for overlapping needed to take into account the factBill Wendling
that one of the numbers is signed while the other is unsigned. This could lead to a wrong result when the signed was promoted to an unsigned int. * Add the data layout line to the testcase so that it will test the appropriate thing. Patch by David Terei! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128577 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-26PR9561: A store with a negative offset (via GEP) could erroniously say that itBill Wendling
completely overlaps a previous store, thus mistakenly deleting that store. Check for this condition. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128319 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-06Fix PR8728, a miscompilation I recently introduced. When optimizingChris Lattner
memcpy's like: memcpy(A, B) memcpy(A, C) we cannot delete the first memcpy as dead if A and C might be aliases. If so, we actually get: memcpy(A, B) memcpy(A, A) which is not correct to transform into: memcpy(A, A) This patch was heavily influenced by Jakub Staszak's patch in PR8728, thanks Jakub! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120974 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30Enhance DSE to handle the variable index case in PR8657.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120498 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30teach DSE to use GetPointerBaseWithConstantOffset to analyzeChris Lattner
may-aliasing stores that partially overlap with different base pointers. This implements PR6043 and the non-variable part of PR8657 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120485 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30enhance isRemovable to refuse to delete volatile mem transfersChris Lattner
now that DSE hacks on them. This fixes a regression I introduced, by generalizing DSE to hack on transfers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120445 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30Rewrite the main DSE loop to be written in terms of reasoningChris Lattner
about pairs of AA::Location's instead of looking for MemDep's "Def" predicate. This is more powerful and general, handling memset/memcpy/store all uniformly, and implementing PR8701 and probably obsoleting parts of memcpyoptimizer. This also fixes an obscure bug with init.trampoline and i8 stores, but I'm not surprised it hasn't been hit yet. Enhancing init.trampoline to carry the size that it stores would allow DSE to be much more aggressive about optimizing them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120406 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30merge one more awayChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120375 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30I already merged partial-overwrite.ll -> PartialStore.llChris Lattner
Merge context-sensitive.ll -> simple.ll and upgrade it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120374 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30clean up DSE tests, removing some poorly reduced and useless old test,Chris Lattner
merging more into other larger .ll files, filecheckizing along the way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120373 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30enhance basicaa to return "Mod" for a memcpy call when theChris Lattner
queried location doesn't overlap the source, and add a testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120370 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30Teach basicaa that memset's modref set is at worst "mod" and neverChris Lattner
contains "ref". Enhance DSE to use a modref query instead of a store-specific hack to generalize the "ignore may-alias stores" optimization to handle memset and memcpy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120368 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-30my previous patch would cause us to start deleting some volatileChris Lattner
stores, fix and add a testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120363 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-29Fix some broken CHECK lines.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120332 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-29fix PR8677, patch by Jakub Staszak!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120325 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-21implement PR8576, deleting dead stores with intervening may-alias stores.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119927 91177308-0d34-0410-b5e6-96231b3b80d8
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