This adds part of the target info code, and adds modifications to
the build scripts so that AVR is recognized a supported, experimental
backend.

It does not include any AVR-specific code, just the bare sources required
for a backend to exist.

From D14039.

llvm-svn: 252865

llvm-svn: 252864

This reverts commit r252862. This introduced test failures and I'm reverting while I investigate how this happened.

llvm-svn: 252863

A function can be marked as norecurse if:
  * The SCC to which it belongs has cardinality 1; and either
    a) It does not call any non-norecurse function. This includes self-recursion; or
    b) It only has one callsite and the function that callsite is within is marked norecurse.

a) is best propagated bottom-up and b) is best propagated top-down.

We build up the norecurse attributes bottom-up using the existing SCC pass, and mark functions with no obvious recursion (but not provably norecurse) to sweep later, top-down.

llvm-svn: 252862

Use %select to merge two diagnostics that only differ in one word and are emitted in the same place. NFC

llvm-svn: 252861

IVs of loops for which the loop header is in the subregion, but not the entire
loop may be incremented outside of the subregion and can consequently not be
kept private to the subregion. Instead, they need to and are modeled as virtual
loops in the iteration domains. As this is the case, generating new subregion
induction variables for such loops is not needed and indeed wrong as they would
hide the virtual induction variables modeled in the scop.

This fixes a miscompile in MultiSource/Benchmarks/Ptrdist/bc and
MultiSource/Benchmarks/nbench/. Thanks Michael and Johannes for their
investiagations and helpful observations regarding this bug.

llvm-svn: 252860

I imagine there's some UB in here somewhere, though Valgrind doesn't
seem to have picked it up (not sure if I have a working asan build right
now to test there).

GDB bot seems to be crashing:
http://lab.llvm.org:8011/builders/clang-x86_64-ubuntu-gdb-75/builds/26267/steps/check-all/logs/FAIL%3A%20LLVM%3A%3Adwarfdump-dwp.test

Hexagon ELF bot is, presumably, just getting different output:
http://lab.llvm.org:8011/builders/clang-hexagon-elf/builds/32927/steps/check-all/logs/FAIL%3A%20LLVM%3A%3Adwarfdump-dwp.test

llvm-svn: 252859

This encompasses several changes which are all interconnected:
 - Use the MC framework for printing almost all instructions.
 - AsmStrings are now live.
 - This introduces an indirection between LLVM vregs and WebAssembly registers,
   and a new pass, WebAssemblyRegNumbering, for computing a basic the mapping.
   This addresses some basic issues with argument registers and unused registers.
 - The way ARGUMENT instructions are handled no longer generates redundant
   get_local+set_local for every argument.

This also changes the assembly syntax somewhat; most notably, MC's printing
use sigils on label names, so those are no longer present, and push/pop now
have a sigil to keep them unambiguous.

The usage of set_local/get_local/$push/$pop will continue to evolve
significantly. This patch is just one step of a larger change.

llvm-svn: 252858

The MIPS target requires specific dynamic section entries to be defined.

 * DT_MIPS_RLD_VERSION and DT_MIPS_FLAGS store predefined values.
 * DT_MIPS_BASE_ADDRESS holds base VA.
 * DT_MIPS_LOCAL_GOTNO holds the number of local GOT entries.
 * DT_MIPS_SYMTABNO holds the number of .dynsym entries.
 * DT_MIPS_GOTSYM holds the index of the .dynsym entry
   which corresponds to the first entry of the global part of GOT.
 * DT_MIPS_RLD_MAP holds the address of the reserved space in the data segment.
 * DT_MIPS_PLTGOT points to the .got.plt section if it exists.
 * DT_PLTGOT holds the address of the GOT section.

See "Dynamic Section" in Chapter 5 in the following document for detailed
description: ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf

Differential revision: http://reviews.llvm.org/D14450

llvm-svn: 252857

Summary:
The option outputs statistics in CSV format preceded by 1 header line.
This is intended for machine processing of the output.
-verbosity=0 should likely be set.

Differential Revision: http://reviews.llvm.org/D14600

llvm-svn: 252856

llvm-svn: 252855

The MIPS ABI has requirements to sort the entries in the .dyn.sym section.
Symbols which are not in the GOT have to precede the symbols which are added to
the GOT. The latter must have the same order as the corresponding GOT entries.

Since these sorting requirements contradict those of the GNU hash section,
they cannot be used together.

Differential revision: http://reviews.llvm.org/D14281

llvm-svn: 252854

This function permits the mangling of a C++ 'structor.  Depending on the ABI and
the declaration, the declaration may contain more than one associated symbol for
a given declaration.  This allows the consumer to retrieve all of the associated
symbols for the declaration the cursor points to.

llvm-svn: 252853

This allows the return of a set of CXStrings from libclang.  This is setup work
for an upcoming change to permit returning multiple mangled symbols.

llvm-svn: 252852

  If an llvm.assume dominates the SCoP entry block and the assumed condition
  can be expressed as an affine inequality we will now add it to the context.

Differential Revision: http://reviews.llvm.org/D14413

llvm-svn: 252851

The code snippets were not being displayed. This commit fixes the bug.

llvm-svn: 252849

Differential Revision: http://reviews.llvm.org/D14412

llvm-svn: 252848

llvm-svn: 252847

  This removes a similar feature from ScopDetection, though with
  -polly-report that feature present twice anyway.

llvm-svn: 252846

llvm-svn: 252845

llvm-svn: 252843

llvm-svn: 252842

llvm-svn: 252841

llvm-svn: 252840

- Factor out code to query and modify the sign bit of a floatingpoint
  value as an integer. This also works if none of the targets integer
  types is big enough to hold all bits of the floatingpoint value.

- Legalize FABS(x) as FCOPYSIGN(x, 0.0) if FCOPYSIGN is available,
  otherwise perform bit manipulation on the sign bit. The previous code
  used "x >u 0 ? x : -x" which is incorrect for x being -0.0! It also
  takes 34 instructions on ARM Cortex-M4. With this patch we only
  require 5:
    vldr d0, LCPI0_0
    vmov r2, r3, d0
    lsrs r2, r3, #31
    bfi r1, r2, #31, #1
    bx lr
  (This could be further improved if the compiler would recognize that
   r2, r3 is zero).

- Only lower FCOPYSIGN(x, y) = sign(x) ? -FABS(x) : FABS(x) if FABS is
  available otherwise perform bit manipulation on the sign bit.

- Perform the sign(x) test by masking out the sign bit and comparing
  with 0 rather than shifting the sign bit to the highest position and
  testing for "<s 0". For x86 copysignl (on 80bit values) this gets us:
    testl $32768, %eax
  rather than:
    shlq $48, %rax
    sets %al
    testb %al, %al

Differential Revision: http://reviews.llvm.org/D11172

llvm-svn: 252839

llvm-svn: 252838

Calls involved in thread-local variable lookup save more registers
than normal calls.

rdar://problem/23073171

llvm-svn: 252837

Also don't create libclang dylib symlinks on darwin.

llvm-svn: 252836

llvm-svn: 252835

target features that the caller function doesn't provide. This matches
the existing backend failure to inline functions that don't have
matching target features - and diagnoses earlier in the case of
always_inline.

Fix up a few test cases that were, in fact, invalid if you tried
to generate code from the backend with the specified target features
and add a couple of tests to illustrate what's going on.

This should fix PR25246.

llvm-svn: 252834

more obvious that it's generic.

llvm-svn: 252833

checkBuiltinTargetFeatures to checkTargetFeatures and sink
the error handling into the function.

llvm-svn: 252832

llvm-svn: 252831

llvm-svn: 252830

llvm-svn: 252829

llvm-svn: 252828

Summary: Diagnose when a function concept declaration has parameter(s)

Reviewers: rsmith, faisalv, aaron.ballman, hubert.reinterpretcast

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D14352

llvm-svn: 252827

Differential Revision: http://reviews.llvm.org/D14357

rdar://problem/21942589

llvm-svn: 252825

For really simple SEH catchpads, we tried to forward the invoke unwind
edge across the empty block.

llvm-svn: 252822

rdar://problem/9001553

llvm-svn: 252820