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* Fix TryToShrinkGlobalToBoolean in GlobalOpt, so that it does not discard ↵Joey Gouly2013-01-101-11/+16
| | | | | | address spaces. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172051 91177308-0d34-0410-b5e6-96231b3b80d8
* Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ↵Dmitri Gribenko2013-01-011-1/+1
| | | | | | | | | | | 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
* Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ↵Dmitri Gribenko2012-12-303-3/+3
| | | | | | | | | 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@171250 91177308-0d34-0410-b5e6-96231b3b80d8
* Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ↵Dmitri Gribenko2012-12-302-2/+2
| | | | | | | | | 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
* Revert previous check in r168581, r169079 as they are still in code review ↵Zhou Sheng2012-12-011-8309/+0
| | | | | | status. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169083 91177308-0d34-0410-b5e6-96231b3b80d8
* The patch is to improve the memory footprint of pass GlobalOpt. Zhou Sheng2012-12-011-0/+8309
| | | | | | | | | | | | | Also check in a case to repeat the issue, on which 'opt -globalopt' consumes 1.6GB memory. The big memory footprint cause is that current GlobalOpt one by one hoists and stores the leaf element constant into the global array, in each iteration, it recreates the global array initializer constant and leave the old initializer alone. This may result in many obsolete constants left. For example: we have global array @rom = global [16 x i32] zeroinitializer After the first element value is hoisted and installed: @rom = global [16 x i32] [ 1, 0, 0, ... ] After the second element value is installed: @rom = global [16 x 32] [ 1, 2, 0, 0, ... ] // here the previous initializer is obsolete ... When the transform is done, we have 15 obsolete initializers left useless. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169079 91177308-0d34-0410-b5e6-96231b3b80d8
* Constant::IsThreadDependent(): Use dyn_cast<Constant> instead of castHans Wennborg2012-11-161-0/+20
| | | | | | | | | | | It turns out that the operands of a Constant are not always themselves Constant. For example, one of the operands of BlockAddress is BasicBlock, which is not a Constant. This should fix the dragonegg-x86_64-linux-gcc-4.6-test build which broke in r168037. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168147 91177308-0d34-0410-b5e6-96231b3b80d8
* Make GlobalOpt be conservative with TLS variables (PR14309)Hans Wennborg2012-11-151-0/+53
| | | | | | | | | | | | | | For global variables that get the same value stored into them everywhere, GlobalOpt will replace them with a constant. The problem is that a thread-local GlobalVariable looks like one value (the address of the TLS var), but is different between threads. This patch introduces Constant::isThreadDependent() which returns true for thread-local variables and constants which depend on them (e.g. a GEP into a thread-local array), and teaches GlobalOpt not to track such values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168037 91177308-0d34-0410-b5e6-96231b3b80d8
* GlobalOpt: non-constexpr bitcasts or GEPs can occur even if the global value ↵Benjamin Kramer2012-09-281-1/+24
| | | | | | | | is only stored once. Fixes PR13968. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164815 91177308-0d34-0410-b5e6-96231b3b80d8
* Add testcases for GlobalOpt changes in r160693 and r160757.Nick Lewycky2012-07-291-3/+33
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160925 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach globalopt to not nuke all stores to globals. Keep them around of theyNick Lewycky2012-07-242-1/+20
| | | | | | | | | | might be deliberate "one time" leaks, so that leak checkers can find them. This is a reapply of r160602 with the fix that this time I'm committing the code I thought I was committing last time; the I->eraseFromParent() goes *after* the break out of the loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160664 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r160602.Nick Lewycky2012-07-212-21/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160603 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach globalopt to play nice with leak checkers. This is a reapplication ofNick Lewycky2012-07-212-1/+21
| | | | | | | | | r160529 that was subsequently reverted. The fix was to not call GV->eraseFromParent() right before the caller does the same. The existing testcases already caught this bug if run under valgrind. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160602 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r160529 due to crashes.Nick Lewycky2012-07-192-21/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160532 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't wipe out global variables that are probably storing pointers to heapNick Lewycky2012-07-192-1/+21
| | | | | | | memory. This makes clang play nice with leak checkers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160529 91177308-0d34-0410-b5e6-96231b3b80d8
* GlobalOpt forgot to handle bitcast when analyzing globals. Found by inspection.Duncan Sands2012-07-021-1/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159546 91177308-0d34-0410-b5e6-96231b3b80d8
* Convert the uses of '|&' to use '2>&1 |' instead, which works on oldChandler Carruth2012-07-021-1/+1
| | | | | | | | | | versions of Bash. In addition, I can back out the change to the lit built-in shell test runner to support this. This should fix the majority of fallout on Darwin, but I suspect there will be a few straggling issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159544 91177308-0d34-0410-b5e6-96231b3b80d8
* Convert all tests using TCL-style quoting to use shell-style quoting.Chandler Carruth2012-07-0211-15/+15
| | | | | | | | | | | | | | | | | | | | | | | | This was done through the aid of a terrible Perl creation. I will not paste any of the horrors here. Suffice to say, it require multiple staged rounds of replacements, state carried between, and a few nested-construct-parsing hacks that I'm not proud of. It happens, by luck, to be able to deal with all the TCL-quoting patterns in evidence in the LLVM test suite. If anyone is maintaining large out-of-tree test trees, feel free to poke me and I'll send you the steps I used to convert things, as well as answer any painful questions etc. IRC works best for this type of thing I find. Once converted, switch the LLVM lit config to use ShTests the same as Clang. In addition to being able to delete large amounts of Python code from 'lit', this will also simplify the entire test suite and some of lit's architecture. Finally, the test suite runs 33% faster on Linux now. ;] For my 16-hardware-thread (2x 4-core xeon e5520): 36s -> 24s git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159525 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r159136 due to PR13124.Matt Beaumont-Gay2012-06-271-14/+0
| | | | | | | | | | | Original commit message: If a constant or a function has linkonce_odr linkage and unnamed_addr, mark it hidden. Being linkonce_odr guarantees that it is available in every dso that needs it. Being a constant/function with unnamed_addr guarantees that the copies don't have to be merged. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159272 91177308-0d34-0410-b5e6-96231b3b80d8
* If a constant or a function has linkonce_odr linkage and unnamed_addr, mark itRafael Espindola2012-06-251-0/+14
| | | | | | | | hidden. Being linkonce_odr guarantees that it is available in every dso that needs it. Being a constant/function with unnamed_addr guarantees that the copies don't have to be merged. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159136 91177308-0d34-0410-b5e6-96231b3b80d8
* Some optimizations done by globalopt are safe only for internal linkage, notRafael Espindola2012-06-151-0/+12
| | | | | | | | linkonce linkage. For example, it is not valid to add unnamed_addr. This also fixes a crash in g++.dg/opt/static5.C. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158528 91177308-0d34-0410-b5e6-96231b3b80d8
* Implement the isSafeToDiscardIfUnused predicate and use it in globalopt andRafael Espindola2012-06-141-4/+20
| | | | | | | globaldce. Globaldce was already removing linkonce globals, but globalopt was not. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158476 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach Function::hasAddressTaken that BlockAddress doesn't really takeJay Foad2012-05-121-0/+16
| | | | | | the address of a function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156703 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a crash on valid (if UB) bitcode that is produced for some globalChandler Carruth2012-04-241-0/+5
| | | | | | | | | | | | | | | | | | | | | constants in C++11 mode. I have no idea why it required such particular circumstances to get here, the code seems clearly to rely upon unchecked assumptions. Specifically, when we decide to form an index into a struct type, we may have gone through (at least one) zero-length array indexing round, which would have left the offset un-adjusted, and thus not necessarily valid for use when indexing the struct type. This is just an canonicalization step, so the correct thing is to refuse to canonicalize nonsensical GEPs of this form. Implemented, and test case added. Fixes PR12642. Pair debugged and coded with Richard Smith. =] I credit him with most of the debugging, and preventing me from writing the wrong code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155466 91177308-0d34-0410-b5e6-96231b3b80d8
* GlobalOpt: If we have an inbounds GEP from a ConstantAggregateZero global ↵Benjamin Kramer2012-03-281-0/+11
| | | | | | that we just determined to be constant, replace all loads from it with a zero value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153576 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach globalopt how to evaluate an invoke with a non-void return type.Dan Gohman2012-03-131-0/+27
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152634 91177308-0d34-0410-b5e6-96231b3b80d8
* Use the target-aware constant folder on expressions to improve the chanceNick Lewycky2012-02-211-0/+43
| | | | | | | | | | | | | | they'll be simple enough to simulate, and to reduce the chance we'll encounter equal but different simple pointer constants. This removes the symptoms from PR11352 but is not a full fix. A proper fix would either require a guarantee that two constant objects we simulate are folded when equal, or a different way of handling equal pointers (ie., trying a constantexpr icmp on them to see whether we know they're equal or non-equal or unsure). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151093 91177308-0d34-0410-b5e6-96231b3b80d8
* Check for the correct size in the invariant marker.Nick Lewycky2012-02-201-4/+30
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151003 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove question.Nick Lewycky2012-02-171-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150809 91177308-0d34-0410-b5e6-96231b3b80d8
* Add support for invariant.start inside the static constructor evaluator. This isNick Lewycky2012-02-171-0/+34
| | | | | | | | | | useful to represent a variable that is const in the source but can't be constant in the IR because of a non-trivial constructor. If globalopt evaluates the constructor, and there was an invariant.start with no matching invariant.end possible, it will mark the global constant afterwards. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150794 91177308-0d34-0410-b5e6-96231b3b80d8
* Replace all instances of dg.exp file with lit.local.cfg, since all tests are ↵Eli Bendersky2012-02-162-3/+1
| | | | | | | | | | | 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
* GlobalOpt: Be more aggressive about elminating side-effect free static dtors.Benjamin Kramer2012-02-091-2/+4
| | | | | | | | | GlobalOpt runs early in the pipeline (before inlining) and complex class hierarchies often introduce bitcasts or GEPs which weren't optimized away. Teach it to ignore side-effect free instructions instead of depending on other passes to remove them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150174 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach GlobalOpt to handle atomic accesses to globals.Nick Lewycky2012-02-051-0/+10
| | | | | | | | | | | | | | | | | | | | * Most of the transforms come through intact by having each transformed load or store copy the ordering and synchronization scope of the original. * The transform that turns a global only accessed in main() into an alloca (since main is non-recursive) with a store of the initial value uses an unordered store, since it's guaranteed to be the first thing to happen in main. (Threads may have started before main (!) but they can't have the address of a function local before the point in the entry block we insert our code.) * The heap-SRoA transforms are disabled in the face of atomic operations. This can probably be improved; it seems odd to have atomic accesses to an alloca that doesn't have its address taken. AnalyzeGlobal keeps track of the strongest ordering found in any use of the global. This is more information than we need right now, but it's cheap to compute and likely to be useful. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149847 91177308-0d34-0410-b5e6-96231b3b80d8
* PR11705, part 2: globalopt shouldn't put inttoptr/ptrtoint operations into ↵Eli Friedman2012-01-051-4/+15
| | | | | | 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
* remove autoupgrade support for old forms of llvm.prefetch and the oldChris Lattner2011-11-271-57/+0
| | | | | | | | trampoline forms. Both of these were correct in LLVM 3.0, and we don't need to support LLVM 2.9 and earlier in mainline. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145174 91177308-0d34-0410-b5e6-96231b3b80d8
* Upgrade syntax of tests using volatile instructions to use 'load volatile' ↵Chris Lattner2011-11-271-1/+1
| | | | | | instead of 'volatile load', which is archaic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145171 91177308-0d34-0410-b5e6-96231b3b80d8
* Refactor code from inlining and globalopt that checks whether a function ↵Eli Friedman2011-10-201-0/+27
| | | | | | definition is unused, and enhance it so it can tell that functions which are only used by a blockaddress are in fact dead. This probably doesn't happen much on most code, but the Linux kernel's _THIS_IP_ can trigger this issue with blockaddress. (GlobalDCE can also handle the given tescase, but we only run that at -O3.) Found while looking at PR11180. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142572 91177308-0d34-0410-b5e6-96231b3b80d8
* Move "atomic" and "volatile" designations on instructions after the opcodeEli Friedman2011-08-121-1/+1
| | | | | | | | | | | | 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
* Land the long talked about "type system rewrite" patch. ThisChris Lattner2011-07-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | patch brings numerous advantages to LLVM. One way to look at it is through diffstat: 109 files changed, 3005 insertions(+), 5906 deletions(-) Removing almost 3K lines of code is a good thing. Other advantages include: 1. Value::getType() is a simple load that can be CSE'd, not a mutating union-find operation. 2. Types a uniqued and never move once created, defining away PATypeHolder. 3. Structs can be "named" now, and their name is part of the identity that uniques them. This means that the compiler doesn't merge them structurally which makes the IR much less confusing. 4. Now that there is no way to get a cycle in a type graph without a named struct type, "upreferences" go away. 5. Type refinement is completely gone, which should make LTO much MUCH faster in some common cases with C++ code. 6. Types are now generally immutable, so we can use "Type *" instead "const Type *" everywhere. Downsides of this patch are that it removes some functions from the C API, so people using those will have to upgrade to (not yet added) new API. "LLVM 3.0" is the right time to do this. There are still some cleanups pending after this, this patch is large enough as-is. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134829 91177308-0d34-0410-b5e6-96231b3b80d8
* rip out a ton of intrinsic modernization logic from AutoUpgrade.cpp, which isChris Lattner2011-06-182-18/+13
| | | | | | | | | | | 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
* manually upgrade a bunch of tests to modern syntax, and remove some thatChris Lattner2011-06-173-3/+10
| | | | | | | | 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
* Add testcase for r132290, to check for the crasher caught by the buildbotsNick Lewycky2011-05-291-2/+12
| | | | | | | doing llvm-gcc selfhost (or cross). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132292 91177308-0d34-0410-b5e6-96231b3b80d8
* Obey the isVolatile bit on memory intrinsics when analyzing uses of a globalNick Lewycky2011-05-291-0/+19
| | | | | | | | | | variable. Noticed by inspection. Simulate memset in EvaluateFunction where the target of the memset and the value we're setting are both the null value. Fixes PR10047! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132288 91177308-0d34-0410-b5e6-96231b3b80d8
* fix PR9856, an incorrectly conservative assertion: a global can beChris Lattner2011-05-221-0/+14
| | | | | | | "stored once" even if its address is compared. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131849 91177308-0d34-0410-b5e6-96231b3b80d8
* Add back a couple checks removed by r129128; the fact that an intitializerEli Friedman2011-04-091-0/+5
| | | | | | | | | is an array of structures doesn't imply it's a ConstantArray of ConstantStruct. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129207 91177308-0d34-0410-b5e6-96231b3b80d8
* Add an optimization to GlobalOpt that eliminates calls to __cxa_atexit, if ↵Anders Carlsson2011-03-201-0/+31
| | | | | | the function passed is empty. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127970 91177308-0d34-0410-b5e6-96231b3b80d8
* Add unnamed_addr when we can show that address of a global is not used.Rafael Espindola2011-01-196-7/+61
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123834 91177308-0d34-0410-b5e6-96231b3b80d8
* Reduce and merge testcases.Owen Anderson2011-01-162-60/+16
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123579 91177308-0d34-0410-b5e6-96231b3b80d8
* Improve the safety of my globalopt enhancement by ensuring that the bitcastOwen Anderson2011-01-161-0/+59
| | | | | | | of the stored value to the new store type is always. Also, add a testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123563 91177308-0d34-0410-b5e6-96231b3b80d8
* fix a globalopt crash on two Adobe-C++ testcases that the recentChris Lattner2011-01-011-0/+9
| | | | | | | loop idiom pass exposed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122674 91177308-0d34-0410-b5e6-96231b3b80d8
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