Summary:
This is the follow-up patch for http://reviews.llvm.org/D19436
* Update the discriminator reading algorithm to match the assignment algorithm.
* Add test to cover the new algorithm.
Reviewers: dnovillo, echristo, dblaikie
Subscribers: danielcdh, dblaikie, echristo, llvm-commits, joker.eph
Differential Revision: http://reviews.llvm.org/D19522
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267945 91177308-0d34-0410-b5e6-96231b3b80d8
This instruction is just a control flow marker - it should not
actually exist in the object file. Unfortunately, nothing catches
it before it gets to AsmPrinter. If integrated assembler is used,
it's considered to be a normal 4-byte instruction, and emitted as
an all-0 word, crashing the program. With external assembler,
a comment is emitted.
Fixed by setting Size to 0 and handling it in MCCodeEmitter - this
means the comment will still be emitted if integrated assembler
is not used.
This broke an ASan test, which has been disabled for a long time
as a result (see the discussion on D19657). We can reenable it
once this lands.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267943 91177308-0d34-0410-b5e6-96231b3b80d8
The DetectDeadLaneMask already ensures that we have no dead subregister
definitions making the special handling in LiveIntervalAnalysis
unnecessary. This reverts most of r248335.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267937 91177308-0d34-0410-b5e6-96231b3b80d8
Dead phi nodes are needed for code motion (such as copy propagation),
where a new use would be placed in a location that would be dominated
by a dead phi. Such a transformation is not legal for copy propagation,
and the existence of the phi would prevent it, but if the phi is not
there, it may appear to be valid.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267932 91177308-0d34-0410-b5e6-96231b3b80d8
Summary: Using libtool instead of ar and ranlib on Darwin shaves a minute off my clang build. This is because on Darwin libtool is optimized to give hints to the kernel about filesystem interactions that allow it to be faster.
Reviewers: bogner, pete
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D19611
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267930 91177308-0d34-0410-b5e6-96231b3b80d8
We now read out the rest of the substreams from the DBI streams. One of
these substreams, the FileInfo substream, contains information about which
source files contribute to each module (aka compiland). This patch
additionally parses out the file information from that substream, and
dumps it in llvm-pdbdump.
Differential Revision: http://reviews.llvm.org/D19634
Reviewed by: ruiu
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267928 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "[Power9] Implement add-pc, multiply-add, modulo, extend-sign-shift, random number, set bool, and dfp test significance".
This patch has caused a functional regression in SPEC2k6 namd, and a performance regression in mesa-pipe.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267927 91177308-0d34-0410-b5e6-96231b3b80d8
ScheduleDAGMI::initQueues changes the RegionBegin to the first non-debug
instruction. Since it does not track register pressure, it does not affect
any RP trackers. ScheduleDAGMILive inherits initQueues from ScheduleDAGMI,
and it does reset the TopTPTracker in its schedule method. Any derived,
target-specific scheduler will need to do it as well, but the TopRPTracker
is only exposed as a "const" object to derived classes. Without the ability
to modify the tracker directly, this leaves a derived scheduler with a
potential of having the TopRPTracker out-of-sync with the CurrentTop.
The symptom of the problem:
void llvm::ScheduleDAGMILive::scheduleMI(llvm::SUnit *, bool):
Assertion `TopRPTracker.getPos() == CurrentTop && "out of sync"' failed.
Differential Revision: http://reviews.llvm.org/D19438
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267918 91177308-0d34-0410-b5e6-96231b3b80d8
The canonical form for allocas is a single allocation of the array type.
In case we see a non-canonical array alloca, make sure we aren't
replacing this with an array N times smaller.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267916 91177308-0d34-0410-b5e6-96231b3b80d8
Should not store Twine objects to local variables. This is fixed the test
failures with r267815 in VS2015 X64 build.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267908 91177308-0d34-0410-b5e6-96231b3b80d8
Currently Mips::emitAtomicBinaryPartword() does not properly respect the
width of pointers. For MIPS64 this causes the memory address that the ll/sc
sequence uses to be truncated. At runtime this causes a segmentation fault.
This can be fixed by applying similar changes as r266204, so that a full 64bit
pointer is loaded.
Reviewers: dsanders
Differential Review: http://reviews.llvm.org/D19651
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267900 91177308-0d34-0410-b5e6-96231b3b80d8
The DWARF2 specification of DW_AT_bit_offset is ambiguous for
little-endian machines, but by restoring to the old behavior
we match what debuggers expect and what other popular compilers
generate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267896 91177308-0d34-0410-b5e6-96231b3b80d8
The DWARF2 specification of DW_AT_bit_offset was written from the perspective of
a big-endian machine with unclear semantics for other systems. DWARF4
deprecated DW_AT_bit_offset and introduced a new attribute DW_AT_data_bit_offset
that simply counts the number of bits from the beginning of the containing
entity regardless of endianness.
After this patch LLVM emits DW_AT_bit_offset for DWARF 2 or 3 and
DW_AT_data_bit_offset when DWARF 4 or later is requested.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267895 91177308-0d34-0410-b5e6-96231b3b80d8
The MOVMSK instructions copies a vector elements' sign bits to the low bits of a scalar register and zeros the high bits.
This patch adds MOVMSK support to SimplifyDemandedUseBits so that its aware that the upper bits are known to be zero. It also removes the call to MOVMSK if none of the lower bits are actually required and just returns zero.
Differential Revision: http://reviews.llvm.org/D19614
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267873 91177308-0d34-0410-b5e6-96231b3b80d8
The DetectDeadLanes pass performs a dataflow analysis of used/defined
subregister lanes across COPY instructions and instructions that will
get lowered to copies. It detects dead definitions and uses reading
undefined values which are obscured by COPY and subregister usage.
These dead definitions cause trouble in the register coalescer which
cannot deal with definitions suddenly becoming dead after coalescing
COPY instructions.
For now the pass only adds dead and undef flags to machine operands. It
should be possible to extend it in the future to remove the dead
instructions and redo the analysis for the affected virtual
registers.
Differential Revision: http://reviews.llvm.org/D18427
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267851 91177308-0d34-0410-b5e6-96231b3b80d8
This function performs the reverse computation of
composeSubRegIndexLaneMask().
It will be used in the upcoming "DetectDeadLanes" pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267849 91177308-0d34-0410-b5e6-96231b3b80d8
Previously using lanemasks on registers without any subregisters was not
well defined. This commit extends TargetRegisterInfo/tablegen to:
- Report a lanemask of 1 for regclasses without subregisters
- Do the right thing when mapping a 0/1 lanemask from a class without
subregisters into a class with subregisters in
TargetRegisterInfo::composeSubRegIndexLaneMasks().
This will be used in the upcoming "DetectDeadLanes" patch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267848 91177308-0d34-0410-b5e6-96231b3b80d8
handleMove() was incorrectly swapping two value numbers. This was missed
before because the problem only occured when moving subregister definitions
and needed -verify-machineinstrs to be detected.
I cannot add a testcase as long as I cannot reapply r260905/r260806.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267840 91177308-0d34-0410-b5e6-96231b3b80d8
