When checking the debug info in a module, don't treat a missing
dbg.value as an error. The dbg.value may simply have been DCE'd, in
which case the debugger has enough information to display the variable
as <optimized out>.

llvm-svn: 335647

Summary:
Adds assembly parsing support for the module summary index (follow on
to r333335 which added the assembly writing support).

I added support to llvm-as to invoke the index parsing, so that it can
create either a bitcode file with a Module and a per-module index, or
a combined index without a Module.

I will send follow on patches soon to do the following:
- add support to tools such as llvm-lto2 to parse the per-module indexes
from assembly instead of bitcode when testing the thin link.
- verification support.

Depends on D47844 and D47842.

Reviewers: pcc, dexonsmith, mehdi_amini

Subscribers: inglorion, eraman, steven_wu, llvm-commits

Differential Revision: https://reviews.llvm.org/D47905

llvm-svn: 335602

This partially reverts r335589.

llvm-svn: 335592

llvm-svn: 335591

llvm-svn: 335589

Summary:
This allows targets to override code generation for some instructions.
As an example of override, this also moves ad-hoc instruction filtering
for X86 into the X86 ExegesisTarget.

Reviewers: gchatelet

Subscribers: mgorny, tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D48587

llvm-svn: 335582

Summary:
This change renames the Backend and BackendPrinter to Pipeline and PipelinePrinter respectively. 
Variables and comments have also been updated to reflect this change.

The reason for this rename, is to be slightly more correct about what MCA is modeling.  MCA models a Pipeline, which implies some logical sequence of stages. 

Reviewers: andreadb, courbet, RKSimon

Reviewed By: andreadb, courbet

Subscribers: mgorny, javed.absar, tschuett, gbedwell, llvm-commits

Differential Revision: https://reviews.llvm.org/D48496

llvm-svn: 335496

llvm-svn: 335470

llvm-svn: 335467

Summary:
This ensures that the snippet always sees the same values for registers,
making measurements reproducible.
This will also allow exploring different values.

Reviewers: gchatelet

Subscribers: tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D48542

llvm-svn: 335465

llvm-svn: 335456

llvm-svn: 335452

llvm-svn: 335450

llvm-svn: 335424

Store the string on the stack rather than just the StringRef.

Fix sanitizer bots:

  http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/19948
  http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap-msan/builds/5500

llvm-svn: 335423

Use the WithColor helper from support to print errors and warnings.

llvm-svn: 335418

Use the WithColor helper from support to print errors.

llvm-svn: 335417

Use the WithColor helper from support to print errors.

llvm-svn: 335416

llvm-svn: 335397

The DispatchUnit is no longer a dependency of RCU, so this patch removes a
stale include and forward decl.  This patch also cleans up some comments.

llvm-svn: 335392

llvm-svn: 335368

Also, move the definition of InstRef at the end of Instruction.h to avoid a
forward declaration.

llvm-svn: 335363

Summary:
Remove explicit stages and introduce a list of stages.

A pipeline should be composed of an arbitrary list of stages, and not any
 predefined list of stages in the Backend.  The Backend should not know of any
 particular stage, rather it should only be concerned that it has a list of
 stages, and that those stages will fulfill the contract of what it means to be
 a Stage (namely pre/post/execute a given instruction).

For now, we leave the original set of stages defined in the Backend ctor;
however, I imagine these will be moved out at a later time.

This patch makes an adjustment to the semantics of Stage::isReady.
Specifically, what the Backend really needs to know is if a Stage has
unfinished work.  With that said, it is more appropriately renamed
Stage::hasWorkToComplete().  This change will clean up the check in
Backend::run(), allowing us to query each stage to see if there is unfinished
work, regardless of what subclass a stage might be.  I feel that this change
simplifies the semantics too, but that's a subjective statement.

Given how RetireStage and ExecuteStage handle data in their preExecute(), I've
had to change the order of Retire and Execute in our stage list.  Retire must
complete any of its preExecute actions before ExecuteStage's preExecute can
take control.  This is mainly because both stages utilize the RCU.  In the
meantime, I want to see if I can adjust that or remove that coupling.

Reviewers: andreadb, RKSimon, courbet

Reviewed By: andreadb

Subscribers: tschuett, gbedwell, llvm-commits

Differential Revision: https://reviews.llvm.org/D46907

llvm-svn: 335361

After the recent refactoring that introduced parallel handling of
different object, the binary holder became unique per object file. This
defeats its optimization of caching archives, leading to an archive
being opened for every binary it contains. This is obviously unfortunate
and will need to be refactored soon.

Luckily in practice, the impact of this is limited as most files are
mmap'ed instead of memcopy'd. There's a caveat however: when the memory
buffer requires a null terminator and it's a multiple of the page size,
we allocate instead of mmap'ing. If this happens for a static archive,
we end up with N copies of it in memory, where N is the number of
objects in the archive, leading to exuberant memory usage. This provided
a stopgap solution to ensure that all the files it loads are mmap in
memory by removing the requirement for a terminating null byte.

Differential revision: https://reviews.llvm.org/D48397

llvm-svn: 335293

Get rid of createExecutableFunction().

llvm-svn: 335240

Summary: Pretty much everything we need is in llvm::TargetMachine.

Reviewers: gchatelet

Subscribers: llvm-commits, tschuett

Differential Revision: https://reviews.llvm.org/D48428

llvm-svn: 335237

Also, rename fields `TotalMappings` and `NumUsedMappings` in struct
RegisterMappingTracker into `NumPhysRegs` and `NumUsedPhysRegs`.

llvm-svn: 335219

Errors found processing the DW_AT_ranges attribute are propagated by lower level 
routines and reported by their callers.

Reviewer: JDevlieghere

Differential Revision: https://reviews.llvm.org/D48344

llvm-svn: 335188

llvm-svn: 335131

Summary:
createX86FloatingPointStackifierPass is disabled until we handle
TracksLiveness correctly.

Reviewers: gchatelet

Subscribers: mgorny, tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D48360

llvm-svn: 335117

[llvm-mca][X86] Teach how to identify register writes that implicitly clear the upper portion of a super-register.

This patch teaches llvm-mca how to identify register writes that implicitly zero
the upper portion of a super-register.

On X86-64, a general purpose register is implemented in hardware as a 64-bit
register. Quoting the Intel 64 Software Developer's Manual: "an update to the
lower 32 bits of a 64 bit integer register is architecturally defined to zero
extend the upper 32 bits".  Also, a write to an XMM register performed by an AVX
instruction implicitly zeroes the upper 128 bits of the aliasing YMM register.

This patch adds a new method named clearsSuperRegisters to the MCInstrAnalysis
interface to help identify instructions that implicitly clear the upper portion
of a super-register.  The rest of the patch teaches llvm-mca how to use that new
method to obtain the information, and update the register dependencies
accordingly.

I compared the kernels from tests clear-super-register-1.s and
clear-super-register-2.s against the output from perf on btver2.  Previously
there was a large discrepancy between the estimated IPC and the measured IPC.
Now the differences are mostly in the noise.

Differential Revision: https://reviews.llvm.org/D48225

llvm-svn: 335113

gcc checks for transitivity (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53903)

llvm-svn: 335109

llvm-svn: 335108

Summary: Introducing a Prototype object to capture Variables that must be set but keeps degrees of freedom as Invalid. This allows exploring non constraint variables later on.

Reviewers: courbet

Subscribers: tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D48316

llvm-svn: 335105

/build/llvm/tools/llvm-exegesis/lib/X86/../Target.h:32:3: error: 'exegesis::ExegesisTarget' has virtual functions but non-virtual destructor [-Werror,-Wnon-virtual-dtor]
  ~ExegesisTarget();
  ^
/build/llvm/tools/llvm-exegesis/lib/X86/Target.cpp:15:7: error: 'exegesis::(anonymous namespace)::ExegesisX86Target' has virtual functions but non-virtual destructor [-Werror,-Wnon-virtual-dtor]
class ExegesisX86Target : public ExegesisTarget {
      ^

llvm-svn: 335042

Fix typo: LLVM_NATIVE_ARCH -> LLVM_EXEGESIS_NATIVE_ARCH.

llvm-svn: 335041

Breaks buildbots.

llvm-svn: 335040

Summary: This is a step towards implementing memory operands and X87.

Reviewers: gchatelet

Subscribers: mgorny, tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D48210

llvm-svn: 335038

This patch removes a few dashes from the header comment to make room for the syntax line.

llvm-svn: 334986

Histogram entries are now ordered by key.  This should improves their
readability when statistics are printed.

llvm-svn: 334961