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* Update aosp/master LLVM for rebase to r222494.Stephen Hines2014-12-021-0/+13
| | | | Change-Id: Ic787f5e0124df789bd26f3f24680f45e678eef2d
* Fix PR17952.Shuxin Yang2013-11-111-7/+9
| | | | | | | | | | | | | | | | | | | | | | | | The symptom is that an assertion is triggered. The assertion was added by me to detect the situation when value is propagated from dead blocks. (We can certainly get rid of assertion; it is safe to do so, because propagating value from dead block to alive join node is certainly ok.) The root cause of this bug is : edge-splitting is conducted on the fly, the edge being split could be a dead edge, therefore the block that split the critial edge needs to be flagged "dead" as well. There are 3 ways to fix this bug: 1) Get rid of the assertion as I mentioned eariler 2) When an dead edge is split, flag the inserted block "dead". 3) proactively split the critical edges connecting dead and live blocks when new dead blocks are revealed. This fix go for 3) with additional 2 LOC. Testing case was added by Rafael the other day. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194424 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert "Resurrect r191017 " GVN proceeds in the presence of dead code" plus ↵Bill Wendling2013-11-101-9/+7
| | | | | | | | | | | | | a fix to PR17307 & 17308." This causes PR17852. This reverts commit d93e8a06b2ca09ab18f390cd514b7443e2e571f7. Conflicts: test/Transforms/GVN/cond_br2.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194348 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix GVN creating bitcast between address spacesMatt Arsenault2013-10-301-3/+17
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193710 91177308-0d34-0410-b5e6-96231b3b80d8
* Resurrect r191017 " GVN proceeds in the presence of dead code" plus a fix to ↵Shuxin Yang2013-09-201-7/+9
| | | | | | | | | | PR17307 & 17308. The problem of r191017 is that when GVN fabricate a val-number for a dead instruction (in order to make following expr-PRE happy), it forget to fabricate a leader-table entry for it as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191118 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r191017, it results in segmentation faults in Qt.Joerg Sonnenberger2013-09-201-9/+7
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191104 91177308-0d34-0410-b5e6-96231b3b80d8
* GVN proceeds in the presence of dead code.Shuxin Yang2013-09-191-7/+9
| | | | | | | | | | | | | | | | | | | | | | | This is how it ignores the dead code: 1) When a dead branch target, say block B, is identified, all the blocks dominated by B is dead as well. 2) The PHIs of those blocks in dominance-frontier(B) is updated such that the operands corresponding to dead predecessors are replaced by "UndefVal". Using lattice's jargon, the "UndefVal" is the "Top" in essence. Phi node like this "phi(v1 bb1, undef xx)" will be optimized into "v1" if v1 is constant, or v1 is an instruction which dominate this PHI node. 3) When analyzing the availability of a load L, all dead mem-ops which L depends on disguise as a load which evaluate exactly same value as L. 4) The dead mem-ops will be materialized as "UndefVal" during code motion. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191017 91177308-0d34-0410-b5e6-96231b3b80d8
* Update Transforms tests to use CHECK-LABEL for easier debugging. No ↵Stephen Lin2013-07-141-28/+28
| | | | | | | | | | | | | | | | | | | | | | | functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186268 91177308-0d34-0410-b5e6-96231b3b80d8
* unHECKify test. It was fixed by Chris in 2009.Jakub Staszak2012-12-121-8/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170017 91177308-0d34-0410-b5e6-96231b3b80d8
* llvm/ConstantFolding.cpp: Make ReadDataFromGlobal() and ↵NAKAMURA Takumi2012-11-081-5/+3
| | | | | | FoldReinterpretLoadFromConstPtr() Big-endian-aware. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167595 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix broken check lines.Benjamin Kramer2012-08-171-2/+2
| | | | | | | | I really need to find a way to automate this, but I can't come up with a regex that has no false positives while handling tricky cases like custom check prefixes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162097 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix crasher in GVN due to my recent capture tracking changes.Nick Lewycky2011-11-211-0/+9
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145047 91177308-0d34-0410-b5e6-96231b3b80d8
* Refactor capture tracking (which already had a couple flags for whether returnsNick Lewycky2011-11-141-0/+25
| | | | | | | | | | | and stores capture) to permit the caller to see each capture point and decide whether to continue looking. Use this inside memdep to do an analysis that basicaa won't do. This lets us solve another devirtualization case, fixing PR8908! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144580 91177308-0d34-0410-b5e6-96231b3b80d8
* rip out a ton of intrinsic modernization logic from AutoUpgrade.cpp, which isChris Lattner2011-06-181-11/+10
| | | | | | | | | | | 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
* Disable the main feature of 130180, the elimination of loads that areDan Gohman2011-06-041-12/+12
| | | | | | | | | | | redundant with partially-aliasing loads. When computing what portion of a clobbering load value is needed, it doesn't consider phi-translation which may have occurred between the clobbing load and the redundant load. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132631 91177308-0d34-0410-b5e6-96231b3b80d8
* remove a trivial test, make some other tests less trivial.Chris Lattner2011-05-221-1/+4
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131846 91177308-0d34-0410-b5e6-96231b3b80d8
* final step needed to resolve PR6627, which allows us to flatten the code down toChris Lattner2011-04-281-3/+26
| | | | | | | | | | | | | | a nice and tidy: %x1 = load i32* %0, align 4 %1 = icmp eq i32 %x1, 1179403647 br i1 %1, label %if.then, label %if.end instead of doing lots of loads and branches. May the FreeBSD bootloader long fit in its allocated space. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130416 91177308-0d34-0410-b5e6-96231b3b80d8
* teach GVN to widen integer loads when they are overaligned, when doing an Chris Lattner2011-04-281-1/+24
| | | | | | | | | | | | | wider load would allow elimination of subsequent loads, and when the wider load is still a native integer type. This eliminates a ton of loads on various benchmarks involving struct fields, though it is somewhat hobbled by clang not being very aggressive about field alignment. This is yet another step along the way towards resolving PR6627. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130390 91177308-0d34-0410-b5e6-96231b3b80d8
* Improve the bail-out predicate to really only kick in when phiChris Lattner2011-04-261-0/+23
| | | | | | | | translation fails. We were bailing out in some cases that would cause us to miss GVN'ing some non-local cases away. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130206 91177308-0d34-0410-b5e6-96231b3b80d8
* Enhance MemDep: When alias analysis returns a partial alias result,Chris Lattner2011-04-261-0/+27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | return it as a clobber. This allows GVN to do smart things. Enhance GVN to be smart about the case when a small load is clobbered by a larger overlapping load. In this case, forward the value. This allows us to compile stuff like this: int test(void *P) { int tmp = *(unsigned int*)P; return tmp+*((unsigned char*)P+1); } into: _test: ## @test movl (%rdi), %ecx movzbl %ch, %eax addl %ecx, %eax ret which has one load. We already handled the case where the smaller load was from a must-aliased base pointer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130180 91177308-0d34-0410-b5e6-96231b3b80d8
* Make BasicAliasAnalysis a normal AliasAnalysis implementation whichDan Gohman2010-10-181-1/+1
| | | | | | | | | | | | | does normal initialization and normal chaining. Change the default AliasAnalysis implementation to NoAlias. Update StandardCompileOpts.h and friends to explicitly request BasicAliasAnalysis. Update tests to explicitly request -basicaa. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116720 91177308-0d34-0410-b5e6-96231b3b80d8
* fix PR6642, GVN forwarding from memset to load of the base of the memset.Chris Lattner2010-03-251-0/+12
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99488 91177308-0d34-0410-b5e6-96231b3b80d8
* fix hte last remaining known (by me) phi translation bug. When we reanalyzeChris Lattner2009-12-091-4/+16
| | | | | | | | clobbers to forward pieces of large stores to small loads, we need to consider the properly phi translated pointer in the store block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90978 91177308-0d34-0410-b5e6-96231b3b80d8
* the code in GVN that tries to forward large loads to small Chris Lattner2009-12-091-0/+54
| | | | | | | | | stores is not phi translating, thus it miscompiles really crazy testcases. This is from inspection, I haven't seen this in the wild. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90930 91177308-0d34-0410-b5e6-96231b3b80d8
* Switch GVN and memdep to use PHITransAddr, which correctly handlesChris Lattner2009-12-091-1/+50
| | | | | | | | | | | | | | | | | | | | | | | | | phi translation of complex expressions like &A[i+1]. This has the following benefits: 1. The phi translation logic is all contained in its own class with a strong interface and verification that it is self consistent. 2. The logic is more correct than before. Previously, if intermediate expressions got PHI translated, we'd miss the update and scan for the wrong pointers in predecessor blocks. @phi_trans2 is a testcase for this. 3. We have a lot less code in memdep. We can handle phi translation across blocks of things like @phi_trans3, which is pretty insane :). This patch should fix the miscompiles of 255.vortex, and I tested it with a bootstrap of llvm-gcc, llvm-test and dejagnu of course. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90926 91177308-0d34-0410-b5e6-96231b3b80d8
* constant fold loads from memcpy's from global constants. This is importantChris Lattner2009-12-061-0/+16
| | | | | | | | because clang lowers nontrivial automatic struct/array inits to memcpy from a global array. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90698 91177308-0d34-0410-b5e6-96231b3b80d8
* add support for forwarding mem intrinsic values to non-local loads.Chris Lattner2009-12-061-0/+26
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90697 91177308-0d34-0410-b5e6-96231b3b80d8
* Handle forwarding local memsets to loads. For example, we optimize this:Chris Lattner2009-12-061-0/+37
| | | | | | | | | | | | | short x(short *A) { memset(A, 1, sizeof(*A)*100); return A[42]; } to 'return 257' instead of doing the load. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90695 91177308-0d34-0410-b5e6-96231b3b80d8
* merge two tests.Chris Lattner2009-12-061-0/+25
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90691 91177308-0d34-0410-b5e6-96231b3b80d8
* Small and carefully crafted testcase showing a miscompilation by GVNChris Lattner2009-12-041-0/+33
| | | | | | | | | that I'm working on. This is manifesting as a miscompile of 255.vortex on some targets. No check lines yet because it fails. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90520 91177308-0d34-0410-b5e6-96231b3b80d8
* fix PR5016, a crash I introduced in GVN handing first classChris Lattner2009-09-211-0/+14
| | | | | | | arrays and structs, which cannot be bitcast to integers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82460 91177308-0d34-0410-b5e6-96231b3b80d8
* enable non-local analysis and PRE of large store -> little load.Chris Lattner2009-09-211-1/+51
| | | | | | | | This doesn't kick in too much because of phi translation issues, but this can be resolved in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82447 91177308-0d34-0410-b5e6-96231b3b80d8
* add pr#Chris Lattner2009-09-211-0/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82440 91177308-0d34-0410-b5e6-96231b3b80d8
* Improve GVN to be able to forward substitute a small load Chris Lattner2009-09-211-0/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | from a piece of a large store when both are in the same block. This allows clang to compile the testcase in PR4216 to this code: _test_bitfield: movl 4(%esp), %eax movl %eax, %ecx andl $-65536, %ecx orl $32962, %eax andl $40186, %eax orl %ecx, %eax ret This is not ideal, but is a whole lot better than the code produced by llvm-gcc: _test_bitfield: movw $-32574, %ax orw 4(%esp), %ax andw $-25350, %ax movw %ax, 4(%esp) movw 7(%esp), %cx shlw $8, %cx movzbl 6(%esp), %edx orw %cx, %dx movzwl %dx, %ecx shll $16, %ecx movzwl %ax, %eax orl %ecx, %eax ret and dramatically better than that produced by gcc 4.2: _test_bitfield: pushl %ebx call L3 "L00000000001$pb": L3: popl %ebx movl 8(%esp), %eax leal 0(,%eax,4), %edx sarb $7, %dl movl %eax, %ecx andl $7168, %ecx andl $-7201, %ebx movzbl %dl, %edx andl $1, %edx sall $5, %edx orl %ecx, %ebx orl %edx, %ebx andl $24, %eax andl $-58336, %ebx orl %eax, %ebx orl $32962, %ebx movl %ebx, %eax popl %ebx ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82439 91177308-0d34-0410-b5e6-96231b3b80d8
* fix a FileCheck bug where:Chris Lattner2009-09-211-1/+0
| | | | | | | | | | | ; CHECK: foo ; CHECK-NOT: foo ; CHECK: bar would always fail. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82424 91177308-0d34-0410-b5e6-96231b3b80d8
* Work around a FileCheck bug, for now.Daniel Dunbar2009-09-201-0/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82416 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r82404, it is causing a bootstrap miscompile. This is very very Chris Lattner2009-09-201-26/+0
| | | | | | | scary, as it indicates a lurking bug. yay. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82411 91177308-0d34-0410-b5e6-96231b3b80d8
* this was not supposed to be committedChris Lattner2009-09-201-21/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82409 91177308-0d34-0410-b5e6-96231b3b80d8
* implement and document support for CHECK-NOTChris Lattner2009-09-201-0/+21
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82408 91177308-0d34-0410-b5e6-96231b3b80d8
* improve memdep to eliminate bitcasts (and aliases, and noop geps) Chris Lattner2009-09-201-0/+26
| | | | | | | | early for the stated reasons: this allows it to find more equivalences and depend less on code layout. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82404 91177308-0d34-0410-b5e6-96231b3b80d8
* Move CoerceAvailableValueToLoadType earlier in GVN.cpp. Hook it upChris Lattner2009-09-201-3/+51
| | | | | | | | | so that nonlocal and partially redundant loads can use it as well. The testcase shows examples of craziness this can handle. This triggers *many* times in 176.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82403 91177308-0d34-0410-b5e6-96231b3b80d8
* enhance GVN to forward substitute a stored value to a loadChris Lattner2009-09-201-0/+119
(and load -> load) when the base pointers must alias but when they are different types. This occurs very very frequently in 176.gcc and other code that uses bitfields a lot. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82399 91177308-0d34-0410-b5e6-96231b3b80d8
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