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2012-08-08Don't use getNextOperandForReg() in RAFast.Jakob Stoklund Olesen
That particular optimization was probably premature anyway. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161541 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-08Deal with irreducible control flow when building traces.Jakob Stoklund Olesen
We filter out MachineLoop back-edges during the trace-building PO traversals, but it is possible to have CFG cycles that aren't natural loops, and MachineLoopInfo doesn't include such cycles. Use a standard visited set to detect such CFG cycles, and completely ignore them when picking traces. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161532 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-08Heed -stress-early-ifcvt.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161513 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-08Get the MispredictPenalty from MCSchedModel.Jakob Stoklund Olesen
Thanks, Andy! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161507 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-08Minor cleanup of defaultDefLatency APIAndrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161470 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-08Revert "Fix a quadratic algorithm in MachineBranchProbabilityInfo."Jakob Stoklund Olesen
It caused an assertion failure when compiling consumer-typeset. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161463 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-08X86: enable CSE between CMP and SUBManman Ren
We perform the following: 1> Use SUB instead of CMP for i8,i16,i32 and i64 in ISel lowering. 2> Modify MachineCSE to correctly handle implicit defs. 3> Convert SUB back to CMP if possible at peephole. Removed pattern matching of (a>b) ? (a-b):0 and like, since they are handled by peephole now. rdar://11873276 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161462 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-08Fix a quadratic algorithm in MachineBranchProbabilityInfo.Jakob Stoklund Olesen
The getSumForBlock function was quadratic in the number of successors because getSuccWeight would perform a linear search for an already known iterator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161460 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07Skip tied operand pairs that already have the same register.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161454 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07Add SelectionDAG::getTargetIndex.Jakob Stoklund Olesen
This adds support for TargetIndex operands during isel. The meaning of these (index, offset, flags) operands is entirely defined by the target. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161453 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07For non-Darwin platforms, we want to generate stack protectors only forBill Wendling
character arrays. This is in line with what GCC does. <rdar://problem/10529227> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161446 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07Add a new kind of MachineOperand: MO_TargetIndex.Jakob Stoklund Olesen
A target index operand looks a lot like a constant pool reference, but it is completely target-defined. It contains the 8-bit TargetFlags, a 32-bit index, and a 64-bit offset. It is preserved by all code generator passes. TargetIndex operands can be used to carry target-specific information in cases where immediate operands won't suffice. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161441 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07Fix a couple of typos.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161437 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07Add trace accessor methods, implement primitive if-conversion heuristic.Jakob Stoklund Olesen
Compare the critical paths of the two traces through an if-conversion candidate. If the difference is larger than the branch brediction penalty, reject the if-conversion. If would never pay. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161433 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07Add a much more conservative strategy for aligning branch targets.Chandler Carruth
Previously, MBP essentially aligned every branch target it could. This bloats code quite a bit, especially non-looping code which has no real reason to prefer aligned branch targets so heavily. As Andy said in review, it's still a bit odd to do this without a real cost model, but this at least has much more plausible heuristics. Fixes PR13265. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161409 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07MachineCSE: Update the heuristics for isProfitableToCSE.Manman Ren
If the result of a common subexpression is used at all uses of the candidate expression, CSE should not increase the live range of the common subexpression. rdar://11393714 and rdar://11819721 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161396 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-04Delete a dead variable.Jakob Stoklund Olesen
TwoAddressInstructionPass doesn't remat any more. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161285 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03TwoAddressInstructionPass refactoring: Extract another method.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161284 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Refactor and check "onlyReadsMemory" before optimizing builtins.Bob Wilson
This patch is mostly just refactoring a bunch of copy-and-pasted code, but it also adds a check that the call instructions are readnone or readonly. That check was already present for sin, cos, sqrt, log2, and exp2 calls, but it was missing for the rest of the builtins being handled in this code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161282 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03TwoAddressInstructionPass refactoring: Extract a method.Jakob Stoklund Olesen
No functional change intended, except replacing a DenseMap with a SmallDenseMap which should behave identically. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161281 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Begin adding support for updating LiveIntervals in TwoAddressInstructionPass.Jakob Stoklund Olesen
This is far from complete, and only changes behavior when the -early-live-intervals flag is passed to llc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161273 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Add an experimental -early-live-intervals option.Jakob Stoklund Olesen
This option runs LiveIntervals before TwoAddressInstructionPass which will eventually learn to exploit and update the analysis. Eventually, LiveIntervals will run before PHIElimination, and we can get rid of LiveVariables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161270 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Delete merged physreg copies in joinReservedPhysReg().Jakob Stoklund Olesen
Previously, the identity copy would survive through register allocation before it was removed by the rewriter. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161269 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Try to reduce the compile time impact of r161232.Bob Wilson
The previous change caused fast isel to not attempt handling any calls to builtin functions. That included things like "printf" and caused some noticable regressions in compile time. I wanted to avoid having fast isel keep a separate list of functions that had to be kept in sync with what the code in SelectionDAGBuilder.cpp was handling. I've resolved that here by moving the list into TargetLibraryInfo. This is somewhat redundant in SelectionDAGBuilder but it will ensure that we keep things consistent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161263 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Fix memcmp code-gen to honor -fno-builtin.Bob Wilson
I noticed that SelectionDAGBuilder::visitCall was missing a check for memcmp in TargetLibraryInfo, so that it would use custom code for memcmp calls even with -fno-builtin. I also had to add a new -disable-simplify-libcalls option to llc so that I could write a test for this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161262 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Completely eliminate VNInfo flags.Jakob Stoklund Olesen
The 'unused' state of a value number can be represented as an invalid def SlotIndex. This also exposed code that shouldn't have been looking at unused value VNInfos. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161258 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Fix a couple of loops that were processing unused value numbers.Jakob Stoklund Olesen
Unused VNInfos should be left alone. Their def SlotIndex doesn't point to anything. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161257 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Silence unused variable warning in -asserts buildMatt Beaumont-Gay
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161256 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Eliminate the VNInfo::hasPHIKill() flag.Jakob Stoklund Olesen
The only real user of the flag was removeCopyByCommutingDef(), and it has been switched to LiveIntervals::hasPHIKill(). All the code changed by this patch was only concerned with computing and propagating the flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161255 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Make the hasPHIKills flag a computed property.Jakob Stoklund Olesen
The VNInfo::HAS_PHI_KILL is only half supported. We precompute it in LiveIntervalAnalysis, but it isn't properly updated by live range splitting and functions like shrinkToUses(). It is only used in one place: RegisterCoalescer::removeCopyByCommutingDef(). This patch changes that function to use a new LiveIntervals::hasPHIKill() function that computes the flag for a given value number. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161254 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Delete dead function.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161242 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Don't delete dead code in TwoAddressInstructionPass.Jakob Stoklund Olesen
This functionality was added before we started running DeadMachineInstructionElim on all targets. It serves no purpose now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161241 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03Fall back to selection DAG isel for calls to builtin functions.Bob Wilson
Fast isel doesn't currently have support for translating builtin function calls to target instructions. For embedded environments where the library functions are not available, this is a matter of correctness and not just optimization. Most of this patch is just arranging to make the TargetLibraryInfo available in fast isel. <rdar://problem/12008746> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161232 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-02X86 Peephole: fold loads to the source register operand if possible.Manman Ren
Add more comments and use early returns to reduce nesting in isLoadFoldable. Also disable folding for V_SET0 to avoid introducing a const pool entry and a const pool load. rdar://10554090 and rdar://11873276 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161207 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-02Compute the critical path length through a trace.Jakob Stoklund Olesen
Whenever both instruction depths and instruction heights are known in a block, it is possible to compute the length of the critical path as max(depth+height) over the instructions in the block. The stored live-in lists make it possible to accurately compute the length of a critical path that bypasses the current (small) block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161197 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-02Verify regunit intervals along with virtreg intervals.Jakob Stoklund Olesen
Don't cause regunit intervals to be computed just to verify them. Only check the already cached intervals. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161183 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-02Avoid creating dangling physreg live ranges during DCE.Jakob Stoklund Olesen
LiveRangeEdit::eliminateDeadDefs() can delete a dead instruction that reads unreserved physregs. This would leave the corresponding regunit live interval dangling because we don't have shrinkToUses() for physical registers. Fix this problem by turning the instruction into a KILL instead of deleting it. This happens in a landing pad in test/CodeGen/X86/2012-05-19-CoalescerCrash.ll: %vreg27<def,dead> = COPY %EDX<kill>; GR32:%vreg27 becomes: KILL %EDX<kill> An upcoming fix to the machine verifier will catch problems like this by verifying regunit live intervals. This fixes PR13498. I am not including the test case from the PR since we already have one exposing the problem once the verifier is fixed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161182 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-02Add report() functions that take a LiveInterval argument.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161178 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-02X86 Peephole: fold loads to the source register operand if possible.Manman Ren
Machine CSE and other optimizations can remove instructions so folding is possible at peephole while not possible at ISel. This patch is a rework of r160919 and was tested on clang self-host on my local machine. rdar://10554090 and rdar://11873276 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161152 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-02Extract some methods from verifyLiveIntervals.Jakob Stoklund Olesen
No functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161149 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-01Also verify RegUnit intervals at uses.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161147 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-01Compute instruction heights through a trace.Jakob Stoklund Olesen
The height on an instruction is the minimum number of cycles from the instruction is issued to the end of the trace. Heights are computed for all instructions in and below the trace center block. The method for computing heights is different from the depth computation. As we visit instructions in the trace bottom-up, heights of used instructions are pushed upwards. This way, we avoid scanning long use lists, looking for uses in the current trace. At each basic block boundary, a list of live-in registers and their minimum heights is saved in the trace block info. These live-in lists are used when restarting depth computations on a trace that converges with an already computed trace. They will also be used to accurately compute the critical path length. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161138 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-01Temporarily revert c23b933d5f8be9b51a1d22e717c0311f65f87dcd. It's causingEric Christopher
failures in the debug testsuite and possibly PR13486. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161121 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-01Add DataDep constructors. Explicitly check SSA form.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161115 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-01Added FMA functionality to X86 target.Elena Demikhovsky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161110 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-31MachineSink: Sort the successors before trying to find SuccToSinkTo.Manman Ren
Use stable_sort instead of sort. Follow-up to r161062. rdar://11980766 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161075 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-31Compute instruction depths through the current trace.Jakob Stoklund Olesen
Assuming infinite issue width, compute the earliest each instruction in the trace can issue, when considering the latency of data dependencies. The issue cycle is record as a 'depth' from the beginning of the trace. This is half the computation required to find the length of the critical path through the trace. Heights are next. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161074 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-31Rename CT -> MTM. MachineTraceMetrics is abbreviated MTM.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161072 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-31MachineSink: Sort the successors before trying to find SuccToSinkTo.Manman Ren
One motivating example is to sink an instruction from a basic block which has two successors: one outside the loop, the other inside the loop. We should try to sink the instruction outside the loop. rdar://11980766 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161062 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-31Conform to LLVM coding style.Micah Villmow
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161061 91177308-0d34-0410-b5e6-96231b3b80d8
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