Traditionally GAS has provided automatic selection between dins, dinsm and
dinsu. Binutils also disassembles all instructions in that family as 'dins'
rather than the actual instruction.
Reviewers: slthakur
Differential Revision: https://reviews.llvm.org/D34877
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313267 91177308-0d34-0410-b5e6-96231b3b80d8
This should bring signed div/rem analysis up to the same level as unsigned.
We use icmp simplification to determine when the divisor is known greater than the dividend.
Each positive test is followed by a negative test to show that we're not overstepping the boundaries of the known bits.
There are extra tests for the signed-min-value special cases.
Alive proofs:
http://rise4fun.com/Alive/WI5
Differential Revision: https://reviews.llvm.org/D37713
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The idea to make an 'isDivZero' helper was suggested for the signed case in D37713:
https://reviews.llvm.org/D37713
This clean-up makes it clear that D37713 is just filling the gap for signed div/rem,
removes unnecessary code, and allows us to remove a bit of duplicated code from the
planned improvement in D37713.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313261 91177308-0d34-0410-b5e6-96231b3b80d8
It used to return the actual field value from the instruction descriptor.
There is no reason for that, that value is not interesting in any way and
the specifics of its encoding in the descriptor should not be exposed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313257 91177308-0d34-0410-b5e6-96231b3b80d8
This patch started as an attempt to rebase Greg's differential (D32821).
The result is both quite similar and different at the same time. It adds
the following checks:
- Verify that all address ranges in a DIE are valid.
- Verify that no ranges within the DIE overlap.
- Verify that no ranges overlap with the ranges of a sibling.
- Verify that children are completely contained in its (direct)
parent's address range. (unless both are subprograms)
Differential revision: https://reviews.llvm.org/D37696
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313255 91177308-0d34-0410-b5e6-96231b3b80d8
This patch complements D16810 "[mips] Make isel select the correct DEXT variant
up front.". Now ISel picks the right variant of DINS, so now there is no need
to replace DINS with the appropriate variant during
MipsMCCodeEmitter::encodeInstruction().
This patch also enables target specific instruction verification for ins, dins,
dinsm, dinsu, ext, dext, dextm, dextu. These instructions have constraints that
are checked when generating MipsISD::Ins and MipsISD::Ext nodes, but these
constraints are not checked during instruction selection. Adding machine
verification should catch outstanding cases.
Finally, correct a bug that instruction verification uncovered, where the
position operand of a DINSU generated during lowering was being silently
and accidently corrected to the correct value.
Reviewers: slthakur
Differential Revision: https://reviews.llvm.org/D34809
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313254 91177308-0d34-0410-b5e6-96231b3b80d8
This patch started as an attempt to rebase Greg's differential (D32821).
The result is both quite similar and different at the same time. It adds
the following checks:
- Verify that all address ranges in a DIE are valid.
- Verify that no ranges within the DIE overlap.
- Verify that no ranges overlap with the ranges of a sibling.
- Verify that children are completely contained in its (direct)
parent's address range. (unless both are subprograms)
Differential revision: https://reviews.llvm.org/D37696
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313250 91177308-0d34-0410-b5e6-96231b3b80d8
Use RotAmt.urem(VTBits) instead of AND(RotAmt, VTBits - 1)
TBH I don't expect non-power-of-2 types to be created, but it makes the logic clearer and matches what we do in other rotation combines.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313245 91177308-0d34-0410-b5e6-96231b3b80d8
invalidated SCCs even when we do not have an updated SCC to redirect
towards.
This comes up in a fairly subtle and surprising circumstance: we need to
have a connected but internal node in the call graph which later becomes
a disconnected island, and then gets deleted. All of this needs to
happen mid-CGSCC walk. Because it is disconnected, we have no way of
computing a new "current" SCC when it gets deleted. Instead, we need to
explicitly check for a deleted "current" SCC and bail out of the current
CGSCC step. This will bubble all the way up to the post-order walk and
then resume correctly.
I've included minimal tests for this bug. The specific behavior
matches something we've seen in the wild with the new PM combined with
ThinLTO and sample PGO, but I've not yet confirmed whether this is the
only issue there.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313242 91177308-0d34-0410-b5e6-96231b3b80d8
This breaks bootstrap builds, and is actually unnecessary. Tested
locally and it seems we can remove -debug-comile just fine.
Follow-up to D37791.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313238 91177308-0d34-0410-b5e6-96231b3b80d8
This patch fixes pr34283, which exposed that the computation of
maximum legal width for vectorization was wrong, because it relied
on MaxInterleaveFactor to obtain the maximum stride used in the loop,
however not all strided accesses in the loop have an interleave-group
associated with them.
Instead of recording the maximum stride in the loop, which can be over
conservative (e.g. if the access with the maximum stride is not involved
in the dependence limitation), this patch tracks the actual maximum legal
width imposed by accesses that are involved in dependencies.
Differential Revision: https://reviews.llvm.org/D37507
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313237 91177308-0d34-0410-b5e6-96231b3b80d8
With fix in formatting for GNU style output.
Original commit message:
This refactors GNUStyle<ELFT>::printGroupSections and
LLVMStyle<ELFT>::printGroupSections to split out all
duplicated code.
After the change these methods just prints the data provided
by introduced getGroups in a corresponding LLVM/GNU format.
Differential revision: https://reviews.llvm.org/D37621
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313236 91177308-0d34-0410-b5e6-96231b3b80d8
This refactors GNUStyle<ELFT>::printGroupSections and
LLVMStyle<ELFT>::printGroupSections to split out all
duplicated code.
After the change these methods just prints the data provided
by introduced getGroups in a corresponding LLVM/GNU format.
Differential revision: https://reviews.llvm.org/D37621
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313234 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
XRay had been assuming that the previous section is the "text" section
of the function when lowering the instrumentation map. Unfortunately
this is not a safe assumption, because we may be coming from lowering
debug type information for the function being lowered.
This fixes an issue with combining -gsplit-dwarf, -generate-type-units,
-debug-compile and -fxray-instrument for sole member functions. When the
split dwarf section is stripped, we're left with references from the
xray_instr_map to the debug section. The change now uses the function's
symbol instead of the previous section's start symbol.
We found the bug while attempting to strip the split debug sections off
an XRay-instrumented object file, which had a peculiar edge-case for
single-function classes where the single function is being lowered.
Because XRay had assocaited the instrumentation map for a function to
the debug types section instead of the function's section, the objcopy
call will fail due to the misplaced reference from the xray_instr_map
section.
Reviewers: pcc, dblaikie, echristo
Subscribers: llvm-commits, aprantl
Differential Revision: https://reviews.llvm.org/D37791
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This broke Chromium's CFI build; see crbug.com/765004.
> We were previously handling aliases during dead stripping by adding
> the aliased global's "original name" GUID to the worklist. This will
> lead to incorrect behaviour if the global has local linkage because
> the original name GUID will not correspond to the global's GUID in
> the summary.
>
> Because an alias is just another name for the global that it
> references, there is no need to mark the referenced global as used,
> or to follow references from any other copies of the global. So all
> we need to do is to follow references from the aliasee's summary
> instead of the alias.
>
> Differential Revision: https://reviews.llvm.org/D37789
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313222 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
Print profile counts as the third value in addition to the existing 'float' and
the 'int' values in the textual block frequency dump, if available.
Reviewers: davidxl
Reviewed By: davidxl
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D37835
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313220 91177308-0d34-0410-b5e6-96231b3b80d8
This caused PR34596.
> [MachineCombiner] Update instruction depths incrementally for large BBs.
>
> Summary:
> For large basic blocks with lots of combinable instructions, the
> MachineTraceMetrics computations in MachineCombiner can dominate the compile
> time, as computing the trace information is quadratic in the number of
> instructions in a BB and it's relevant successors/predecessors.
>
> In most cases, knowing the instruction depth should be enough to make
> combination decisions. As we already iterate over all instructions in a basic
> block, the instruction depth can be computed incrementally. This reduces the
> cost of machine-combine drastically in cases where lots of instructions
> are combined. The major drawback is that AFAIK, computing the critical path
> length cannot be done incrementally. Therefore we only compute
> instruction depths incrementally, for basic blocks with more
> instructions than inc_threshold. The -machine-combiner-inc-threshold
> option can be used to set the threshold and allows for easier
> experimenting and checking if using incremental updates for all basic
> blocks has any impact on the performance.
>
> Reviewers: sanjoy, Gerolf, MatzeB, efriedma, fhahn
>
> Reviewed By: fhahn
>
> Subscribers: kiranchandramohan, javed.absar, efriedma, llvm-commits
>
> Differential Revision: https://reviews.llvm.org/D36619
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MachineScheduler when clustering loads or stores checks if base
pointers point to the same memory. This check is done through
comparison of base registers of two memory instructions. This
works fine when instructions have separate offset operand. If
they require a full calculated pointer such instructions can
never be clustered according to such logic.
Changed shouldClusterMemOps to accept base registers as well and
let it decide what to do about it.
Differential Revision: https://reviews.llvm.org/D37698
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313208 91177308-0d34-0410-b5e6-96231b3b80d8
Since users typically don't really care about the .dwo / non.dwo
distinction, this patch makes it so dwarfdump --debug-<info,...> dumps
.debug_info and (if available) also .debug_info.dwo. This simplifies
the command line interface (I've removed all dwo-specific dump
options) and makes the tool friendlier to use.
Differential Revision: https://reviews.llvm.org/D37771
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313207 91177308-0d34-0410-b5e6-96231b3b80d8
Previously we used a size of '1' for VLAs because we weren't sure what
MSVC did. However, MSVC does support declaring an array without a size,
for which it emits an array type with a size of zero. Clang emits the
same DI metadata for VLAs and arrays without bound, so we would describe
arrays without bound as having one element. This lead to Microsoft
debuggers only printing a single element.
Emitting a size of zero appears to cause these debuggers to search the
symbol information to find a definition of the variable with accurate
array bounds.
Fixes http://crbug.com/763580
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313203 91177308-0d34-0410-b5e6-96231b3b80d8
This is to fix PR34502. After rL311401, the live range of spilled vreg will be
cleared. HoistSpill need to use the live range of the original vreg before splitting
to know the moving range of the spills. The patch saves a copy of live interval for
the spilled vreg inside of HoistSpillHelper.
Differential Revision: https://reviews.llvm.org/D37578
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313197 91177308-0d34-0410-b5e6-96231b3b80d8
Summary: SampleProfileLoader inlines hot functions if it is inlined in the profiled binary. However, the inline needs to be guarded by legality check, otherwise it could lead to correctness issues.
Reviewers: eraman, davidxl
Reviewed By: eraman
Subscribers: sanjoy, llvm-commits
Differential Revision: https://reviews.llvm.org/D37779
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313195 91177308-0d34-0410-b5e6-96231b3b80d8
