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2010-12-19Enhance LICM to promote alias sets whose pointers themselves are stored,Chris Lattner
which doesn't affect the memory address being promoted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122172 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-19fix PR8602, a bug in an assertion: a volatile store *of* a pointerChris Lattner
does not make the alias set for that pointer volatile, just stores *to* the pointer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122171 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-19revert r122164, I'm going to go with a different approach.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122168 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-19first step to fixing PR8642: don't fold away empty basic blocksChris Lattner
which have trapping constant exprs in them due to PHI nodes. Eliminating them can cause the constant expr to be evalutated on new paths if the input edges are critical. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122164 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-18simplify this a bit.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122156 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17Whitespace fixes. No functionality change.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122110 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17Add vector versions of some existing scalar transforms to aid codegen in ↵Nate Begeman
matching psign & pblend operations to the IR produced by clang/gcc for their C idioms. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122105 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17Reapply r121905 (automatic synthesis of @llvm.sadd.with.overflow) with a fix ↵Owen Anderson
for a bug that manifested itself on the DragonEgg self-host bot. Unfortunately, the testcase is pretty messy and doesn't reduce well due to interactions with other parts of InstCombine. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122072 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17SimplifyCFG: Ranges can be larger than 64 bits. Fixes Release-selfhost build.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122054 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17improve switch formation to handle small range Chris Lattner
comparisons formed by comparisons. For example, this: void foo(unsigned x) { if (x == 0 || x == 1 || x == 3 || x == 4 || x == 6) bar(); } compiles into: _foo: ## @foo ## BB#0: ## %entry cmpl $6, %edi ja LBB0_2 ## BB#1: ## %entry movl %edi, %eax movl $91, %ecx btq %rax, %rcx jb LBB0_3 instead of: _foo: ## @foo ## BB#0: ## %entry cmpl $2, %edi jb LBB0_4 ## BB#1: ## %switch.early.test cmpl $6, %edi ja LBB0_3 ## BB#2: ## %switch.early.test movl %edi, %eax movl $88, %ecx btq %rax, %rcx jb LBB0_4 This catches a bunch of cases in GCC, which look like this: %804 = load i32* @which_alternative, align 4, !tbaa !0 %805 = icmp ult i32 %804, 2 %806 = icmp eq i32 %804, 3 %or.cond121 = or i1 %805, %806 %807 = icmp eq i32 %804, 4 %or.cond124 = or i1 %or.cond121, %807 br i1 %or.cond124, label %.thread, label %808 turning this into a range comparison. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122045 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17Revert r64460. strtol and friends cannot be marked readonly, even withDan Gohman
a null endptr argument, because they may write to errno. This fixes a seflhost miscompile observed on Linux targets when TBAA was enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122014 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-16Fix a bug in the loop in JumpThreading::ProcessThreadableEdges() where it ↵Frits van Bommel
could falsely produce a MultipleDestSentinel value if the first predecessor ended with an 'indirectbr'. If that happened, it caused an unnecessary FindMostPopularDest() call. This wasn't a correctness problem, but it broke the fast path for single-predecessor blocks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121966 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-16Speculatively revert commit 121905 since it looks like it might have broken theDuncan Sands
dragonegg self-host buildbot. Original commit message: Add an InstCombine transform to recognize instances of manual overflow-safe addition (performing the addition in a wider type and explicitly checking for overflow), and fold them down to intrinsics. This currently only supports signed-addition, but could be generalized if someone works out the magic constant formulas for other operations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121965 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-16Make memcpyopt TBAA-aware.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121944 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Preserve TBAA tags when doing load PRE.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121921 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Add an InstCombine transform to recognize instances of manual overflow-safe ↵Owen Anderson
addition (performing the addition in a wider type and explicitly checking for overflow), and fold them down to intrinsics. This currently only supports signed-addition, but could be generalized if someone works out the magic constant formulas for other operations. Fixes <rdar://problem/8558713>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121905 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Move Value::getUnderlyingObject to be a standaloneDan Gohman
function so that it can live in Analysis instead of VMCore. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121885 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Move Sub simplifications and additional Add simplifications out ofDuncan Sands
instcombine and into InstructionSimplify. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121861 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Teach jump threading to "look through" a select when the branch direction of ↵Frits van Bommel
a terminator depends on it. When it sees a promising select it now tries to figure out whether the condition of the select is known in any of the predecessors and if so it maps the operands appropriately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121859 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15make qsort predicate more conformant by returning 0 for equal values.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121838 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Fix PR8790, another instance where unreachable code can cause instruction ↵Owen Anderson
simplification to fail, this case involve a select that simplifies to itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121817 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Cleanup trailing whitespace.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121816 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14 - Insert new instructions before DomBlock's terminator,Chris Lattner
which is simpler than finding a place to insert in BB. - Don't perform the 'if condition hoisting' xform on certain i1 PHIs, as it interferes with switch formation. This re-fixes "example 7", without breaking the world hopefully. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121764 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14fix two significant issues with FoldTwoEntryPHINode:Chris Lattner
first, it can kick in on blocks whose conditions have been folded to a constant, even though one of the edges will be trivially folded. second, it doesn't clean up the "if diamond" that it just eliminated away. This is a problem because other simplifycfg xforms kick in depending on the order of block visitation, causing pointless work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121762 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14remove the instsimplify logic I added in r121754. It is apparentlyChris Lattner
breaking the selfhost builds, though I can't fathom how. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121761 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14clean up logic, convert std::set to SmallPtrSet, handle the caseChris Lattner
when all 2-entry phis are simplified away. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121760 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14tidy up a bit, move DEBUG down to when we commit to doing the transform so we Chris Lattner
don't print it unless the xform happens. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121758 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14use SimplifyInstruction instead of reimplementing part of it.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121757 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14simplify GetIfCondition by using getSinglePredecessor.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121756 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14use AddPredecessorToBlock in 3 places instead of a manual loop.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121755 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14make FoldTwoEntryPHINode use instsimplify a bit, makeChris Lattner
GetIfCondition faster by avoiding pred_iterator. No really interesting change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121754 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14remove the dead (and terrible) llvm::RemoveSuccessor function.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121753 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14improve DEBUG's a bit, switch to eraseFromParent() to simplifyChris Lattner
code a bit, switch from constant folding to instsimplify. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121751 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14reapply my recent change that disables a piece of the switch formationChris Lattner
work, but fixes 400.perlbmk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121749 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Fix recent buildbot breakage by pulling SimplifyCFG back to its state as of ↵Owen Anderson
r121694, the most recent state where I'm confident there were no crashes or miscompilations. XFAIL the test added since then for now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121733 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13temporarily disable part of my previous patch, which causes an iterator ↵Chris Lattner
invalidation issue, causing a crash on some versions of perlbmk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121728 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13add some DEBUG's.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121711 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Fix sort predicate. qsort(3)'s predicate semantics differ from std::sort's. ↵Benjamin Kramer
Fixes PR 8780. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121705 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13reinstate my patch: the miscompile was caused by an inverted branch in theChris Lattner
'and' case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121695 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Completely disable the optimization I added in r121680 untilChris Lattner
I can track down a miscompile. This should bring the buildbots back to life git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121693 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Make simplifycfg reprocess newly formed "br (cond1 | cond2)" conditionsChris Lattner
when simplifying, allowing them to be eagerly turned into switches. This is the last step required to get "Example 7" from this blog post: http://blog.regehr.org/archives/320 On X86, we now generate this machine code, which (to my eye) seems better than the ICC generated code: _crud: ## @crud ## BB#0: ## %entry cmpb $33, %dil jb LBB0_4 ## BB#1: ## %switch.early.test addb $-34, %dil cmpb $58, %dil ja LBB0_3 ## BB#2: ## %switch.early.test movzbl %dil, %eax movabsq $288230376537592865, %rcx ## imm = 0x400000017001421 btq %rax, %rcx jb LBB0_4 LBB0_3: ## %lor.rhs xorl %eax, %eax ret LBB0_4: ## %lor.end movl $1, %eax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121690 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13make this logic a bit simpler.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121689 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13split all the guts of SimplifyCFGOpt::run out into one functionChris Lattner
per terminator kind. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121688 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13fix a bug in r121680 that upset the various buildbots.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121687 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13refactor the speculative execution logic to be factored into the cond branch ↵Chris Lattner
code instead of doing a cfg search for every block simplified. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121686 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13simplify a bunch of code.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121685 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13move HoistThenElseCodeToIf up to a more logical and efficient-to-handle place.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121684 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13move 'MergeBlocksIntoPredecessor' call earlier. UseChris Lattner
getSinglePredecessor to simplify code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121683 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13factor new code out to a SimplifyBranchOnICmpChain helper function.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121681 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13enhance the "change or icmp's into switch" xform to handle one value in an Chris Lattner
'or sequence' that it doesn't understand. This allows us to optimize something insane like this: int crud (unsigned char c, unsigned x) { if(((((((((( (int) c <= 32 || (int) c == 46) || (int) c == 44) || (int) c == 58) || (int) c == 59) || (int) c == 60) || (int) c == 62) || (int) c == 34) || (int) c == 92) || (int) c == 39) != 0) foo(); } into: define i32 @crud(i8 zeroext %c, i32 %x) nounwind ssp noredzone { entry: %cmp = icmp ult i8 %c, 33 br i1 %cmp, label %if.then, label %switch.early.test switch.early.test: ; preds = %entry switch i8 %c, label %if.end [ i8 39, label %if.then i8 44, label %if.then i8 58, label %if.then i8 59, label %if.then i8 60, label %if.then i8 62, label %if.then i8 46, label %if.then i8 92, label %if.then i8 34, label %if.then ] by pulling the < comparison out ahead of the newly formed switch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121680 91177308-0d34-0410-b5e6-96231b3b80d8
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