The current SGPR spilling test does not stress this
because it is using s_buffer_load instructions to
increase SGPR pressure and spill, but their output
operands have the same SReg_32_XM0 constraint. This fixes
an error when the SReg_32 output from most instructions
is spilled.
llvm-svn: 270301
This saves a small amount of code size, and is a first small step toward
passing values on the stack across block boundaries.
Differential Review: http://reviews.llvm.org/D20450
llvm-svn: 270294
We now use LiveRangeCalc::extendToUses() instead of a specially designed
algorithm in constructMainRangeFromSubranges():
- The original motivation for constructMainRangeFromSubranges() were
differences between the main liverange and subranges because of hidden
dead definitions. This case however cannot happen anymore with the
DetectDeadLaneMasks pass in place.
- It simplifies the code.
- This fixes a longstanding bug where we did not properly create new SSA
values on merging control flow (the MachineVerifier missed most of
these cases).
- Move constructMainRangeFromSubranges() to LiveIntervalAnalysis and
LiveRangeCalc to better match the implementation/available helper
functions.
This re-applies r269016. The fixes from r270290 and r270259 should avoid
the machine verifier problems this time.
llvm-svn: 270291
It is fine for subregister ranges to be undefined on some CFG paths as
we may have a "vregX:other_subreg<read-undef> =" def on that path. We
do not (and should not) have live segments for the subregister ranges.
The MachineVerifier should not complain about this.
This is a slight variant of http://llvm.org/PR27705
llvm-svn: 270290
In addition to clarifying the warning message this contains a minor functional
change in that it now warns if the *immediate* parent directory in which the
missing PCM is expected to be isn't found.
This patch also includes a more comprehensive testcase.
rdar://problem/25860711
llvm-svn: 270269
DBI stream contains a stream number of the symbol record stream.
Symbol record streams is an array of length-type-value members.
Each member represents one symbol.
Publics stream contains offsets to the symbol record stream.
This patch is to print out all symbols that are referenced by
the publics stream.
Note that even with this patch, llvm-pdbdump cannot dump all the
information in a publics stream since it contains more information
than symbol names. I'll improve it in followup patches.
Differential Revision: http://reviews.llvm.org/D20480
llvm-svn: 270262
Fix renameDisconnectedComponents() creating vreg uses that can be
reached from function begin withouthaving a definition (or explicit
live-in). Fix this by inserting IMPLICIT_DEF instruction before
control-flow joins as necessary.
Removes an assert from MachineScheduler because we may now get
additional IMPLICIT_DEF when preparing the scheduling policy.
This fixes the underlying problem of http://llvm.org/PR27705
llvm-svn: 270259
Summary:
As this optimization converts two loads into one load with two shift instructions,
it could potentially hurt performance if a loop is arithmetic operation intensive.
Reviewers: t.p.northover, mcrosier, jmolloy
Subscribers: evandro, jmolloy, aemerson, rengolin, mcrosier, llvm-commits
Differential Revision: http://reviews.llvm.org/D20172
llvm-svn: 270251
Check that the incoming blocks of phi nodes are identical, and block
function merging if they are not.
rdar://problem/26255167
Differential Revision: http://reviews.llvm.org/D20462
llvm-svn: 270250
The uuid_command was duplicating the load_command.cmdsize field. This removes the duplicate from the YAML mapping and from the test cases.
llvm-svn: 270248
This adds support for handling unknown load commands, and a bogus_load_command tests.
Unknown or unsupported load commands can be specified in YAML by their hex value.
llvm-svn: 270239
This patch is a first step towards a more extendible method of matching combined target shuffle masks.
Initially this just pulls out the existing basic mask matches and adds support for some 256/512 bit equivalents. Future patterns will require a number of features to be added but I wanted to keep this patch simple.
I hope we can avoid duplication between shuffle lowering and combining and share more complex pattern match functions in future commits.
Differential Revision: http://reviews.llvm.org/D19198
llvm-svn: 270230
This refactors the logic in X86 to avoid code duplication. It also
splits it in two steps: it first decides if a symbol is local to the DSO
and then uses that information to decide how to access it.
The first part is implemented by shouldAssumeDSOLocal. It is not in any
way specific to X86. In a followup patch I intend to move it to
somewhere common and reused it in other backends.
llvm-svn: 270209
If an inline function is observed but unused in a translation unit, dummy
coverage mapping data with zero hash is stored for this function.
If such a coverage mapping section came earlier than real one, the latter
was ignored. As a result, llvm-cov was unable to show coverage information
for those functions.
Differential Revision: http://reviews.llvm.org/D20286
llvm-svn: 270194
Now that MachO load command fields are fully covered we can fill unaccounted for bytes with 0. That allows us to sparsely specify YAML to simplify tests.
Simplifying load_commands test accordingly.
llvm-svn: 270158
Before r257832, the threshold used by SimpleInliner was explicitly specified or generated from opt levels and passed to the base class Inliner's constructor. There, it was first overridden by explicitly specified -inline-threshold. The refactoring in r257832 did not preserve this behavior for all opt levels. This change brings back the original behavior.
Differential Revision: http://reviews.llvm.org/D20452
llvm-svn: 270153
Sequences of range checks expressed using guards, like
guard((I - 2) u< L)
guard((I - 1) u< L)
guard((I + 0) u< L)
guard((I + 1) u< L)
guard((I + 2) u< L)
can sometimes be combined into a smaller sequence:
guard((I - 2) u< L AND (I + 2) u< L)
if we can prove that (I - 2) u< L AND (I + 2) u< L implies all of checks
expressed in the previous sequence.
This change teaches GuardWidening to do this kind of merging when
feasible.
llvm-svn: 270151
When matching an interleaved load to an ldN pattern, the interleaved access
pass checks that all users of the load are shuffles. If the load is used by an
instruction other than a shuffle, the pass gives up and an ldN is not
generated. This patch considers users of the load that are extractelement
instructions. It attempts to modify the extracts to use one of the available
shuffles rather than the load. After the transformation, the load is only used
by shuffles and will then be matched with an ldN pattern.
Differential Revision: http://reviews.llvm.org/D20250
llvm-svn: 270142
This patch fixes https://llvm.org/bugs/show_bug.cgi?id=27703.
If there is a sequence of one or more load instructions, each loaded value is used as address of later load instruction, bitcast is necessary to change the value type, don't optimize it.
llvm-svn: 270135
Since the calls don't return, the instruction afterwards will never run,
and is just taking up unnecessary space in the binary.
Differential Revision: http://reviews.llvm.org/D20406
llvm-svn: 270109
It broke buildbot:
http://lab.llvm.org:8011/builders/clang-s390x-linux/builds/4817/steps/ninja%20check%201/logs/stdio
Actually it is just because D20273 not yet commited, but these 2 were crossing with each other,
and I`ll better find the way to land them separatelly soon.
Initial commit message:
[llvm-mc] - Teach llvm-mc to generate compressed debug sections in zlib style.
Before this patch llvm-mc generated zlib-gnu styled sections.
That means no SHF_COMPRESSED flag was set, magic 'zlib' signature
was used in combination with full size field. Sections were renamed to "*.z*".
This patch reimplements the compression style to zlib one as zlib-gnu looks
to be depricated everywhere.
Differential revision: http://reviews.llvm.org/D20331
llvm-svn: 270075
This patch changes the order in which we attempt to prove the independence of
strided accesses. We previously did this after we knew the dependence distance
was positive. With this change, we check for independence before handling the
negative distance case. The patch prevents LAA from reporting forward
dependences for independent strided accesses.
This change was requested in the review of D19984.
llvm-svn: 270072
Before this patch llvm-mc generated zlib-gnu styled sections.
That means no SHF_COMPRESSED flag was set, magic 'zlib' signature
was used in combination with full size field. Sections were renamed to "*.z*".
This patch reimplements the compression style to zlib one as zlib-gnu looks
to be depricated everywhere.
Differential revision: http://reviews.llvm.org/D20331
llvm-svn: 270070
