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2008-02-18simplify some code, BreakUpSubtract always returns nonnull now.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47251 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-17Fold (-x + -y) -> -(x+y) which promotes better association, fixingChris Lattner
the second half of PR2047 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47244 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-17fix pastoChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47242 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-17Split up subtracts into add+negate if they have a reassociable use or operandChris Lattner
that is also a subtract. This implements PR2047 and Transforms/Reassociate/subtest2.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47241 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-17make the logic for breaking up subtracts more explicit, no Chris Lattner
functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47239 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-16Remove any 'nest' parameter attributes if the functionDuncan Sands
is not passed as an argument to a trampoline intrinsic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47220 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-15Fix PR2028Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47150 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-14If loop header is also loop exiting block then OrigPN is incoming value for ↵Devang Patel
B loop header. Fixes PR 2030. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47141 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-14Fix PR2029Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47129 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-14simplify code, no functionality change.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47116 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-14Fix PR2032. Inform the alias analysis of changes to the underlying program.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47111 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-13A loop latch phi node may have uses inside loop, not just in loop header.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47093 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-13Rename APInt's isPositive to isNonNegative, to reflect what itDan Gohman
actually does. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47090 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-13While moving exit condition, do not drop loop latch on the floor.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47089 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-13Keep track of exit value operand number when operands are swapped.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47082 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-13remove some dead code.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47066 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-12Re-apply the patch to improve the optimizations of memcpy's, with severalOwen Anderson
bugs fixed. This now passes PPC bootstrap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47026 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-12Fix for bug 1996: optimize out loads of undef. This code basically just Eli Friedman
checks for a malloc/alloca immediately followed by a load. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47006 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-10Fix scalarrepl to not 'miscompile' undefined code, part #2.Chris Lattner
This fixes the store case, my previous patch just fixed the load case. rdar://5707076. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46932 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-08Fix PR 1995.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46898 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-06Temporarily reverting:Bill Wendling
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080128/057882.html This is causing a miscompilation on PPC G5 and just now seeing it on iMac x86-64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46822 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-05Make RenamePass faster by making the 'is this a new phi node'Chris Lattner
check more intelligent. This speeds up mem2reg from 5.29s to 0.79s on a synthetic testcase with tons of predecessors and phi nodes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46767 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-05Fix a bug compiling PR1978 (perhaps not the only one though) whichChris Lattner
was incorrectly simplifying "x == (gep x, 1, i)" into false, even though i could be negative. As it turns out, all the code to handle this already existed, we just need to disable the incorrect optimization case and let the general case handle it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46739 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-04Be more precise when eliminating pointers bue to memcpy's. This allows moreOwen Anderson
stores to be deleted in some cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46694 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-04Allow GVN to hack on memcpy's, making them open to further optimization.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46693 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-03There are some cases where icmp(add) can be folded into a new icmp. Handle them.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46687 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-03Hack on vectors too.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46684 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-03Fold away one multiply in instcombine. This would normally be caught inNick Lewycky
reassociate anyways, but they could be generated during instcombine's run. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46683 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-01Don't drop function/call return attributes like 'nounwind'.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46645 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-30Remove a couple more cases of "getNumUses() == 0". No need to walk the linkedNick Lewycky
list just to see if whether the list is empty. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46555 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-30Use empty() instead of comparing size() with zero.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46554 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-30Don't DCE FreeInst's. We were using those! Patch from Owen Anderson.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46553 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-30Make DSE much more aggressive by performing DCE earlier. Update a testcase ↵Owen Anderson
to reflect this increased aggressiveness. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46542 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-30Fix a bug where scalarrepl would discard offset if type would match.Chris Lattner
In practice this can only happen on code with already undefined behavior, but this is still a good thing to handle correctly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46539 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-29Don't let globalopt hack on volatile loads or stores.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46523 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-29Use empty() instead of comparing size() with zero.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46514 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-29eliminate additions of 0.0 when they are obviously dead. This has to be ↵Chris Lattner
careful to avoid turning -0.0 + 0.0 -> -0.0 which is incorrect. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46499 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-29Add support for eliminating memcpy's at the end of functions. Also fix some ↵Owen Anderson
errors I noticed in the handling of eliminating stores to byval arguments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46494 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-29Filter loops that subtract induction variables.Devang Patel
These loops are not yet handled. Fix PR 1912. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46484 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-28Transform calls to memcpy into llvm.memcpy calls, patch by Eli Friedman.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46433 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-28Handle some more combinations of extend and icmp. Fixes PR1940.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46431 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-28Fix PR1932 by disabling an xform invalid for fdiv.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46429 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-28Fix PR1938 by forcing the code that uses an undefined value to branch oneChris Lattner
way or the other. Rewriting the code itself prevents subsequent analysis passes from making contradictory conclusions about the code that could cause an infeasible path to be made feasible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46427 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-27Be more careful modifying the use_list while also iterating through it.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46417 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-27Revert r46393: readonly/readnone functions are noDuncan Sands
longer allowed to write through byval arguments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46416 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-27The CorrelatedExpressionElimination pass is known to be buggy. Remove it.Bill Wendling
This fixes PR1769. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46408 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-27Fold fptrunc(add (fpextend x), (fpextend y)) -> add(x,y), as GCC does.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46406 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-26If there are no machine instructions emitted for a function, then insertBill Wendling
a "nop" instruction so that we don't have the function's label associated with something that it's not supposed to be associated with. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46394 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-26Create an explicit copy for byval parameters evenDuncan Sands
when inlining a readonly function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46393 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-26If we have a function like this:Bill Wendling
void bork() { int *address = 0; *address = 0; } It's compiled into LLVM code that looks like this: define void @bork() noreturn nounwind { entry: unreachable } This is bad on some platforms (like PPC) because it will generate the label for the function but no body. The label could end up being associated with some non-code related stuff, like a section. This places a "trap" instruction if the SimplifyCFG pass removed all code from the function leaving only one "unreachable" instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46387 91177308-0d34-0410-b5e6-96231b3b80d8
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