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2008-05-09don't sink invokes, even if they are readonly. This fixes aChris Lattner
crash on kimwitu++. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50901 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-09Implement PR2298. This transforms:Chris Lattner
~x < ~y --> y < x -x == -y --> x == y git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50882 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-09restore doxygen comment.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50881 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-08Improve pass documentation and comments.Gordon Henriksen
Patch by Matthijs Kooijman! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50861 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-08More than just loads can read from memory: readonly calls like strlenChris Lattner
also need to be checked for memory modifying instructions before we can sink them. THis fixes the second half of PR2297. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50860 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-08Make instcombine's DSE respect loads as well as stores. It is not safe toChris Lattner
delete the first store in: store x -> p load p store y -> p This is for PR2297. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50859 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-07Turn StripPointerCast() into a methodAnton Korobeynikov
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50836 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-07Fix a bug in the ComputeMaskedBits logic for multiply.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50793 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-06Make StripPointerCast a common function (should we mak it method of Value ↵Anton Korobeynikov
instead?) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50775 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-06We need to update PHIs containing the exiting block, not the exit block. We ↵Owen Anderson
really should come up with better names for these. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50770 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-06Fix typo.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50713 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-06fix typo Duncan noticedChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50699 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-06Make several variable declarations static.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50696 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-06Correct the value of LowBits in srem and urem handling inDan Gohman
ComputeMaskedBits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50692 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-05Fix: Some classes were derived from a class in an anonymous namespace, but theyBill Wendling
themselves weren't in the anonymous namespace. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50673 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-05Fix a crash when threading a block that includes a MRV call result.Chris Lattner
DemoteRegToStack doesn't work with MRVs yet, because it relies on the ability to load/store things. This fixes PR2285. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50667 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-04processStore may delete the instruction, avoidTorok Edwin
using dyn_cast<> on already freed memory. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50618 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-03Do not sink getresult.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50600 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-02Fix a mistake in the computation of leading zeros for udiv.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50591 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-02strength reduce exp2 into ldexp, rdar://5852514Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50586 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-02add a FIXME so we remember to eventually remove this code.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50582 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-02Porting r50563 from Tak to mainline.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50564 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-01Don't try to create PHIs of struct types. FalloutDale Johannesen
from x86-64 calling convention work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50545 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-01Fix an overaggressive SimplifyDemandedBits optimization on urem. ThisDan Gohman
fixes the 254.gap regression on x86 and the 403.gcc regression on x86-64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50537 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-011) add '-debug' outputChris Lattner
2) Return NULL instead of false in several places for tidiness. 3) fix a bug optimizing sprintf(p, "%c", x) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50521 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-01Delete the IPO simplify-libcalls and completely reimplement it asChris Lattner
a FunctionPass. This makes it simpler, fixes dozens of bugs, adds a couple of minor features, and shrinks is considerably: from 2214 to 1437 lines. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50520 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-30This condition got inverted accidentally.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50473 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-30move lowering of llvm.memset -> store from simplify libcalls Chris Lattner
to instcombine. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50472 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29Revert r50441. The original code was correct. Add some more comments so ↵Owen Anderson
that I don't make the same mistake in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50446 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29Fix a bug in memcpyopt where the memcpy-memcpy transform was never being ↵Owen Anderson
applied because we were checking for it in the wrong order. This caused a miscompilation because the return slot optimization assumes that the call it is dealing with is NOT a memcpy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50444 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29We should be returning true here since we've changed the function.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50442 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29A lot of cleanups and documentation improvements, as well as a few corner ↵Owen Anderson
case fixes. Most of this was suggested by Chris. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50441 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29Rename DeadLoopElimination to LoopDeletion, part 2.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50437 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29Rename DeadLoopElimination to LoopDeletion, part one.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50436 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29don't eliminate load from volatile value on paths where the load is dead.Chris Lattner
This fixes the second half of PR2262 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50430 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29fix a subtle volatile handling bug.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50428 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29Clarify what we mean by a dead loop.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50406 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29don't delete the last store to an alloca if the store is volatile.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50390 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29Add some more comments.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50384 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29Remove debugging code.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50383 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-29Add dead loop elimination, which removes dead loops for which we can computeOwen Anderson
the trip count. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50382 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-28Fix DSE to not eliminate volatile loads with no uses.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50370 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-28Teach InstCombine's ComputeMaskedBits what SelectionDAG'sDan Gohman
ComputeMaskedBits knows about cttz, ctlz, and ctpop. Teach SelectionDAG's ComputeMaskedBits what InstCombine's knows about SRem. And teach them both some things about high bits in Mul, UDiv, URem, and Sub. This allows instcombine and dagcombine to eliminate sign-extension operations in several new cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50358 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-27Implement a signficant optimization for inline asm:Chris Lattner
When choosing between constraints with multiple options, like "ir", test to see if we can use the 'i' constraint and go with that if possible. This produces more optimal ASM in all cases (sparing a register and an instruction to load it), and fixes inline asm like this: void test () { asm volatile (" %c0 %1 " : : "imr" (42), "imr"(14)); } Previously we would dump "42" into a memory location (which is ok for the 'm' constraint) which would cause a problem because the 'c' modifier is not valid on memory operands. Isn't it great how inline asm turns 'missed optimization' into 'compile failed'?? Incidentally, this was the todo in PowerPC/2007-04-24-InlineAsm-I-Modifier.ll Please do NOT pull this into Tak. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50315 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-27Move a bunch of inline asm code out of line.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50313 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-25change comments per reviewDale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50300 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-25Remove the code from CodeGenPrepare that moved getresult instructionsDan Gohman
to the block that defines their operands. This doesn't work in the case that the operand is an invoke, because invoke is a terminator and must be the last instruction in a block. Replace it with support in SelectionDAGISel for copying struct values into sequences of virtual registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50279 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-25Remove 'unwinds to' support from mainline. This patch undoes r47802 r47989Nick Lewycky
r48047 r48084 r48085 r48086 r48088 r48096 r48099 r48109 and r48123. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50265 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-25Don't infininitely thread branches when a threaded edgeChris Lattner
goes back to the block, e.g.: Threading edge through bool from 'bb37.us.thread3829' to 'bb37.us' with cost: 1, across block: bb37.us: ; preds = %bb37.us.thread3829, %bb37.us, %bb33 %D1361.1.us = phi i32 [ %tmp36, %bb33 ], [ %D1361.1.us, %bb37.us ], [ 0, %bb37.us.thread3829 ] ; <i32> [#uses=2] %tmp39.us = icmp eq i32 %D1361.1.us, 0 ; <i1> [#uses=1] br i1 %tmp39.us, label %bb37.us, label %bb42.us git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50251 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-24code restructuring, not functionality change.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50203 91177308-0d34-0410-b5e6-96231b3b80d8
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