Use a pointer as the relocation iterator.

Since the relocation iterator walks only the relocations in one section, we
can just use a pointer and avoid fetching information about the section at
every reference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180189 91177308-0d34-0410-b5e6-96231b3b80d8
Formatting fixes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180190 91177308-0d34-0410-b5e6-96231b3b80d8
MI Sched: regpressure tracing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180191 91177308-0d34-0410-b5e6-96231b3b80d8
Register Coalescing: add a flag to disable rescheduling.

When MachineScheduler is enabled, this functionality can be
removed. Until then, provide a way to disable it for test cases and
designing MachineScheduler heuristics.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180192 91177308-0d34-0410-b5e6-96231b3b80d8
MI Sched: eliminate local vreg copies.

For now, we just reschedule instructions that use the copied vregs and
let regalloc elliminate it. I would really like to eliminate the
copies on-the-fly during scheduling, but we need a complete
implementation of repairIntervalsInRange() first.

The general strategy is for the register coalescer to eliminate as
many global copies as possible and shrink live ranges to be
extended-basic-block local. The coalescer should not have to worry
about resolving local copies (e.g. it shouldn't attemp to reorder
instructions). The scheduler is a much better place to deal with local
interference. The coalescer side of this equation needs work.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180193 91177308-0d34-0410-b5e6-96231b3b80d8
Revert r180189.

This should bring the ppc bots back. I will try to write a test that would
have found the problem on a little endian system too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180194 91177308-0d34-0410-b5e6-96231b3b80d8
LoopVectorizer: Bail out if we don't have datalayout we need it

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180195 91177308-0d34-0410-b5e6-96231b3b80d8
LoopVectorize: Scalarize padded types

This patch disables memory-instruction vectorization for types that need padding
bytes, e.g., x86_fp80 has 10 bytes store size with 6 bytes padding in darwin on
x86_64. Because the load/store vectorization is performed by the bit casting to
a packed vector, which has incompatible memory layout due to the lack of padding
bytes, the present vectorizer produces inconsistent result for memory
instructions of those types.
This patch checks an equality of the AllocSize of a scalar type and allocated
size for each vector element, to ensure that there is no padding bytes and the
array can be read/written using vector operations.

Patch by Daisuke Takahashi!

Fixes PR15758.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180196 91177308-0d34-0410-b5e6-96231b3b80d8
LoopVectorizer: Change variable name Stride to ConsecutiveStride

This makes it easier to read the code.

No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180197 91177308-0d34-0410-b5e6-96231b3b80d8
Don't forward declare environ on Windows

That seems to interact poorly with the environ and _environ macros
defined in MSVC's <stdlib.h>.

Also remove the incorrect comment about _NSGetEnviron().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180200 91177308-0d34-0410-b5e6-96231b3b80d8
Don't produce an empty llvm.compiler.used in LTO.

LTO was always creating an empty llvm.compiler.used. With this patch we
now first check if there is anything to be added first.

Unfortunately, there is no good way to test libLTO in isolation as it needs gold
or ld64, but there are bots doing LTO builds that found this problem.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180202 91177308-0d34-0410-b5e6-96231b3b80d8
Use pointers to iterate over symbols.

While here, don't report a dummy symbol for relocations that don't have symbols.
We used to says such relocations were for the first defined symbol, but now we
return end_symbols(). The llvm-readobj output change agrees with otool.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180214 91177308-0d34-0410-b5e6-96231b3b80d8
Mips assembler: Add 64 bit testing for JAL

Contributer: Vladimir Medic


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180220 91177308-0d34-0410-b5e6-96231b3b80d8
Fixed comment typo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180221 91177308-0d34-0410-b5e6-96231b3b80d8
[objc-arc] Added ImpreciseAutoreleaseSet to track autorelease calls that were once autoreleaseRV instructions.

Due to the semantics of ARC, we must be extremely conservative with autorelease
calls inserted by the frontend since ARC gaurantees that said object will be in
the autorelease pool after that point, an optimization invariant that the
optimizer must respect.

On the other hand, we are allowed significantly more flexibility with
autoreleaseRV instructions.

Often times though this flexibility is disrupted by early transformations which
transform objc_autoreleaseRV => objc_autorelease if said instruction is no
longer being used as part of an RV pair (generally due to inlining). Since we
can not tell the difference in between an autorelease put into place by the
frontend and one created through said ``strength reduction'' we can not perform
these optimizations.

The addition of this set gets around said issues by allowing us to differentiate
in between said two cases.

rdar://problem/13697741.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180222 91177308-0d34-0410-b5e6-96231b3b80d8
Making invalidateInstructionCache automatic in SectionMemoryManager

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180225 91177308-0d34-0410-b5e6-96231b3b80d8
[inline asm] Fix a crasher for an invalid value type/register class.
rdar://13731657


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180226 91177308-0d34-0410-b5e6-96231b3b80d8
Fix for r180193 - MI Sched: eliminate local vreg.

Fixes PR15838. Need to check for blocks with nothing but dbg.value.

I'm not sure how to force this situation with a unit test. I tried to
reduce the test case in PR15838 (1k lines of metadata) but gave up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180227 91177308-0d34-0410-b5e6-96231b3b80d8
Exposing MCJIT through C API

Patch by Filip Pizlo



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180229 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Use SHT_PROGBITS for the .AMDGPU.config section

The libelf implementation that is distributed here:
http://www.mr511.de/software/english.html
will not parse sections that are marked SHT_NULL.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180230 91177308-0d34-0410-b5e6-96231b3b80d8