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2011-04-05InstCombine optimizes gep(bitcast(x)) even when the bitcasts casts away addressNadav Rotem
space info. We crash with an assert in this case. This change checks that the address space of the bitcasted pointer is the same as the gep ptr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128884 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-04Remove some support for ReturnInsts with multiple operands, and forJay Foad
returning a scalar value in a function whose return type is a single- element structure or array. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128810 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-04Attempt to fix breakage from r128782 reported by Francois Pichet onEli Friedman
llvm-commits. (Not sure why it only breaks on Windows; maybe it has something to do with the iterator representation...) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128802 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-02PR9446: RecursivelyDeleteTriviallyDeadInstructions can delete the instructionEli Friedman
after the given instruction; make sure to handle that case correctly. (It's difficult to trigger; the included testcase involves a dead block, but I don't think that's a requirement.) While I'm here, get rid of the unnecessary warning about SimplifyInstructionsInBlock, since it should work correctly as far as I know. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128782 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-02While SimplifyDemandedBits constant folds this, we can't rely on it here.Benjamin Kramer
It's possible to craft an input that hits the recursion limits in a way that SimplifyDemandedBits doesn't simplify the icmp but ComputeMaskedBits can infer which bits are zero. No test case as it depends on too many other things. Fixes PR9609. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128777 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-01Fix comment.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128745 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-01Tweaks to the icmp+sext-to-shifts optimization to address Frits' comments:Benjamin Kramer
- Localize the check if an icmp has one use to a place where we know we're introducing something that's likely more expensive than a sext from i1. - Add an assert to make sure a case that would lead to a miscompilation is folded away earlier. - Fix a typo. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128744 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-01Fix build.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128733 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-01InstCombine: Turn icmp + sext into bitwise/integer ops when the input has ↵Benjamin Kramer
only one unknown bit. int test1(unsigned x) { return (x&8) ? 0 : -1; } int test3(unsigned x) { return (x&8) ? -1 : 0; } before (x86_64): _test1: andl $8, %edi cmpl $1, %edi sbbl %eax, %eax ret _test3: andl $8, %edi cmpl $1, %edi sbbl %eax, %eax notl %eax ret after: _test1: shrl $3, %edi andl $1, %edi leal -1(%rdi), %eax ret _test3: shll $28, %edi movl %edi, %eax sarl $31, %eax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128732 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-01InstCombine: Move (sext icmp) transforms into their own method. No intended ↵Benjamin Kramer
functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128731 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31Instcombile optimization: extractelement(cast) -> cast(extractelement)Nadav Rotem
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128683 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31InstCombine: APFloat can't perform arithmetic on PPC double doubles, don't ↵Benjamin Kramer
even try. Thanks Eli! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128676 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31InstCombine: Fix transform to use the swapped predicate.Benjamin Kramer
Thanks Frits! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128628 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31InstCombine: fold fcmp (fneg x), (fneg y) -> fcmp x, yBenjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128627 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31InstCombine: fold fcmp pred (fneg x), C -> fcmp swap(pred) x, -CBenjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128626 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31InstCombine: Shrink "fcmp (fpext x), C" to "fcmp x, C" if C can be ↵Benjamin Kramer
losslessly converted to the type of x. Fixes PR9592. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128625 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31InstCombine: fold fcmp (fpext x), (fpext y) -> fcmp x, y.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128624 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
2011-03-30InstCombine: If the divisor of an fdiv has an exact inverse, turn it into an ↵Benjamin Kramer
fmul. Fixes PR9587. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128546 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30Remove PHINode::reserveOperandSpace(). Instead, add a parameter toJay Foad
PHINode::Create() giving the (known or expected) number of operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128537 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30(Almost) always call reserveOperandSpace() on newly created PHINodes.Jay Foad
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128535 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-29InstCombine: Add a few missing combines for ANDs and ORs of sign bit tests.Benjamin Kramer
On x86 we now compile "if (a < 0 && b < 0)" into testl %edi, %esi js IF.THEN git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128496 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-29DSE: Remove an early exit optimization that depended on the ordering of a ↵Benjamin Kramer
SmallPtrSet. Fixes PR9569 and will hopefully make selfhost on ASLR-enabled systems more deterministic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128482 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-29Do some simple copy propagation through integer loads and stores when promotingCameron Zwarich
vector types. This helps a lot with inlined functions when using the ARM soft float ABI. Fixes <rdar://problem/9184212>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128453 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-28Remove tabs I accidentally added.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128413 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-28Make more use of PHINode::getNumIncomingValues().Jay Foad
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128406 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-27Add some debug output when -instcombine uses RAUW. This can make debug ↵Frits van Bommel
output for those cases much clearer since without this it only showed that the original instruction was removed, not what it was replaced with. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128399 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-27Teach the transformation that moves binary operators around selects to preserveNick Lewycky
the subclass optional data. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128388 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-27Use APInt's umul_ov instead of rolling our own overflow detection.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128380 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-27Add a small missed optimization: turn X == C ? X : Y into X == C ? C : Y. ThisNick Lewycky
removes one use of X which helps it pass the many hasOneUse() checks. In my analysis, this turns up very often where X = A >>exact B and that can't be simplified unless X has one use (except by increasing the lifetime of A which is generally a performance loss). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128373 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-26Simplification noticed by Frits.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128333 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-26Rework the logic that determines if a store completely overlaps an ealier store.Bill Wendling
There are two ways that a later store can comletely overlap a previous store: 1. They both start at the same offset, but the earlier store's size is <= the later's size, or 2. The earlier store's offset is > the later's offset, but it's offset + size doesn't extend past the later's offset + size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128332 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-26Fix a typo and add a test.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128331 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
2011-03-25No functionality change, just adjust some whitespace for coding style ↵Nick Lewycky
compliance. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128257 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-24Debug intrinsics must be skipped at the beginning and ends of blocks, lest theyCameron Zwarich
affect the generated code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128217 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-24It is enough for the CallInst to have no uses to be made a tail call with a retCameron Zwarich
void; it doesn't need to have a void type. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128212 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-24s/UpdateDT/ModifiedDT/gDevang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128211 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-24Do early taildup of ret in CodeGenPrepare for potential tail calls that have aCameron Zwarich
void return type. This fixes PR9487. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-24Use an early return instead of a long if block.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128196 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-24When UpdateDT is set, DT is invalid, which could cause problems when trying toCameron Zwarich
use it later. I couldn't make a test that hits this with the current code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128195 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-24Check for TLI so that -codegenprepare can be used from opt.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128194 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-23Fix PR9464 by correcting some math that just happened to be right in most casesCameron Zwarich
that were hit in practice. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128146 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-22Handle another case that Frits suggested.Anders Carlsson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128068 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-21Simplify.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128030 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-21More cleanups to the OptimizeEmptyGlobalCXXDtors GlobalOpt function.Anders Carlsson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127997 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-21As suggested by Nick Lewycky, ignore debugging intrinsics when trying to ↵Anders Carlsson
decide whether a destructor is empty or not. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127985 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-21Fix commentsNick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127984 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-21Re-apply r127953 with fixes: eliminate empty return block if it has no ↵Evan Cheng
predecessors; update dominator tree if cfg is modified. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127981 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-20Don't try to eliminate invokes to __cxa_atexit.Anders Carlsson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127976 91177308-0d34-0410-b5e6-96231b3b80d8
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