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2011-04-07Recompute hasPHIKill flags when shrinking live intervals.Jakob Stoklund Olesen
PHI values may be deleted, causing the flags to be wrong. This fixes PR9616. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129092 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-07Avoid moving iterators when the previous block was just visited.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129081 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-07Prefer multiplications to divisions.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129080 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-07Extract SpillPlacement::addLinks for handling the special transparent blocks.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129079 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-07Remove dead code. rdar://9221736.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129044 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-06Also account for the spill code that would be inserted in live-through ↵Jakob Stoklund Olesen
blocks with interference. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129030 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-06Abort the constraint calculation early when all positive bias is lost.Jakob Stoklund Olesen
Without any positive bias, there is nothing for the spill placer to to. It will spill everywhere. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129029 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-06Keep track of the number of positively biased nodes when adding constraints.Jakob Stoklund Olesen
If there are no positive nodes, the algorithm can be aborted early. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129021 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-06Break the spill placement algorithm into three parts: prepare, ↵Jakob Stoklund Olesen
addConstraints, and finish. This will allow us to abort the algorithm early if it is determined to be futile. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129020 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-06Oops. Scary.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128986 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-06Analyze blocks with uses separately from live-through blocks without uses.Jakob Stoklund Olesen
About 90% of the relevant blocks are live-through without uses, and the only information required about them is their number. This saves memory and enables later optimizations that need to look at only the use-blocks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128985 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Sign errorJakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128963 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Don't crash when a value is defined after the last split point.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128962 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Permit blocks to branch directly to a landing pad.Jakob Stoklund Olesen
Treat the landing pad as a normal successor when that happens. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128961 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Add support to encode function's template parameters.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128947 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Run LiveDebugVariables in RegAllocBasic and RegAllocGreedy.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128935 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Refactor.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128929 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Add an assertion instead of crashing when the scavenger goes past the endBob Wilson
of a basic block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128925 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05When dead code elimination removes all but one use, try to fold the single ↵Jakob Stoklund Olesen
def into the remaining use. Rematerialization can leave single-use loads behind that we might as well fold whenever possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128918 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Do not emit empty name.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128914 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Ensure all defs referring to a virtual register are marked dead by ↵Jakob Stoklund Olesen
addRegisterDead(). There can be multiple defs for a single virtual register when they are defining sub-registers. The missing <dead> flag was stopping the inline spiller from eliminating dead code after rematerialization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128888 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Print visibility info for external variables.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128887 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Use std::unique instead of a SmallPtrSet to ensure unique instructions in ↵Jakob Stoklund Olesen
UseSlots. This allows us to always keep the smaller slot for an instruction which is what we want when a register has early clobber defines. Drop the UsingInstrs set and the UsingBlocks map. They are no longer needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128886 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Stop precomputing last split points, query the SplitAnalysis cache on demand.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128875 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Cache the fairly expensive last split point computation and provide a fastJakob Stoklund Olesen
inlined path for the common case. Most basic blocks don't contain a call that may throw, so the last split point os simply the first terminator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128874 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Revamp the SjLj "dispatch setup" intrinsic.Bill Wendling
It needed to be moved closer to the setjmp statement, because the code directly after the setjmp needs to know about values that are on the stack. Also, the 'bitcast' of the function context was causing a dead load. This wouldn't be too horrible, except that at -O0 it wasn't optimized out, and because it wasn't using the correct base pointer (if there is a VLA), it would try to access a value from a garbage address. <rdar://problem/9130540> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128873 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-05Revert 123704; it broke threaded LLVM.Stuart Hastings
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128868 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-04Allow coalescing with reserved physregs in certain cases:Jakob Stoklund Olesen
When a virtual register has a single value that is defined as a copy of a reserved register, permit that copy to be joined. These virtual register are usually copies of the stack pointer: %vreg75<def> = COPY %ESP; GR32:%vreg75 MOV32mr %vreg75, 1, %noreg, 0, %noreg, %vreg74<kill> MOV32mi %vreg75, 1, %noreg, 8, %noreg, 0 MOV32mi %vreg75<kill>, 1, %noreg, 4, %noreg, 0 CALLpcrel32 ... Coalescing these virtual registers early decreases register pressure. Previously, they were coalesced by RALinScan::attemptTrivialCoalescing after register allocation was completed. The lower register pressure causes the mcinst-lowering-cmp0.ll test case to fail because it depends on linear scan spilling a particular register. I am deleting 2008-08-05-SpillerBug.ll because it is counting the number of instructions emitted, and its revision history shows the 'correct' count being edited many times. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128845 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-04Extract physreg joining policy to a separate method.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128844 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-04Stop caching basic block index ranges now that SlotIndexes can keep up.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128821 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-04Delete leftover data members.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128820 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-02Use InterferenceCache in RegAllocGreedy.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128765 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-02Add an InterferenceCache class for caching per-block interference ranges.Jakob Stoklund Olesen
When the greedy register allocator is splitting multiple global live ranges, it tends to look at the same interference data many times. The InterferenceCache class caches queries for unaltered LiveIntervalUnions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128764 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-02Use basic block numbers as indexes when mapping slot index ranges.Jakob Stoklund Olesen
This is more compact and faster than using DenseMap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128763 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-02Add a RemoveFromWorklist method to DCI. This is needed to do some complicatedCameron Zwarich
transformations in target-specific DAG combines without causing DAGCombiner to delete the same node twice. If you know of a better way to avoid this (see my next patch for an example), please let me know. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128758 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-01Add comments.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128730 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-01Assign node order numbers to results of call instruction lowering. This ↵Evan Cheng
should improve src line debug info when sdisel is used. rdar://9199118 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128728 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-01Issue libcalls __udivmod*i4 / __divmod*i4 for div / rem pairs.Evan Cheng
rdar://8911343 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128696 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31The basic register allocator must also use the inline spiller.Jakob Stoklund Olesen
It is using a trivial rewriter that doesn't know how to insert spill code requested by the standard spiller. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128688 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31Don't completely eliminate identity copies that also modify super register ↵Jakob Stoklund Olesen
liveness. Turn them into noop KILL instructions instead. This lets the scavenger know when super-registers are killed and defined. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128645 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31Allow kill flags on two-address instructions. They are harmless.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128643 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31Mark all uses as <undef> when joining a copy.Jakob Stoklund Olesen
This way, shrinkToUses() will ignore the instruction that is about to be deleted, and we avoid leaving invalid live ranges that SplitKit doesn't like. Fix a misunderstanding in MachineVerifier about <def,undef> operands. The <undef> flag is valid on def operands where it has the same meaning as <undef> on a use operand. It only applies to sub-register defines which also read the full register. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128642 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31Remove dead code.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128639 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31Fix bug found by valgrind.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128634 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31lib/CodeGen/LiveIntervalAnalysis.cpp: [PR9590] Don't use ↵NAKAMURA Takumi
std::pow(float,float) here. We don't expect the real "powf()" on some hosts (and powf() would be available on other hosts). For consistency, std::pow(double,double) may be called instead. Or, precision issue might attack us, to see unstable regalloc and stack coloring. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128629 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-31Pick a conservative register class when creating a small live range for remat.Jakob Stoklund Olesen
The rematerialized instruction may require a more constrained register class than the register being spilled. In the test case, the spilled register has been inflated to the DPR register class, but we are rematerializing a load of the ssub_0 sub-register which only exists for DPR_VFP2 registers. The register class is reinflated after spilling, so the conservative choice is only temporary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128610 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30Fix evil VirtRegRewriter bug.Jakob Stoklund Olesen
The rewriter can keep track of multiple stack slots in the same register if they happen to have the same value. When an instruction modifies a stack slot by defining a register that is mapped to a stack slot, other stack slots in that register are no longer valid. This is a very rare problem, and I don't have a simple test case. I get the impression that VirtRegRewriter knows it is about to be deleted, inventing a last opaque problem. <rdar://problem/9204040> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128562 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30Teach VirtRegRewriter about the new virtual register numbers. No functional ↵Jakob Stoklund Olesen
change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128561 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
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