Add more ARM instruction encodings for 's' bit set and "rs" register encoding
bits.  Patch by Johnny Chen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85167 91177308-0d34-0410-b5e6-96231b3b80d8

Allow the aggressive anti-dep breaker to process the same region multiple times. This is necessary because new anti-dependencies are exposed when "current" ones are broken.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85166 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify this code. LoopDeletion doesn't need to explicit check that
the loop exiting block dominates the latch block; if ScalarEvolution
can prove that the trip-count is finite, that's sufficient.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85165 91177308-0d34-0410-b5e6-96231b3b80d8

Code that checks WillNotOverflowSignedAdd before creating an Add
can safely use the NSW bit on the Add.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85164 91177308-0d34-0410-b5e6-96231b3b80d8

Update CMake files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85161 91177308-0d34-0410-b5e6-96231b3b80d8

Teach BasicAA how to analyze Select instructions, and make it more
aggressive on PHI instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85158 91177308-0d34-0410-b5e6-96231b3b80d8

Remove / use flags that are now set in the Makefile.config.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85149 91177308-0d34-0410-b5e6-96231b3b80d8

Regenerate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85148 91177308-0d34-0410-b5e6-96231b3b80d8

Add an autoconf test to check for optional compiler flags like
-Wno-missing-field-initializers or -Wno-variadic-macros.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85147 91177308-0d34-0410-b5e6-96231b3b80d8

Define virtual destructor in *.cpp file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85146 91177308-0d34-0410-b5e6-96231b3b80d8

Add aggressive anti-dependence breaker. Currently it is not the default for any target. Enable with -break-anti-dependencies=all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85145 91177308-0d34-0410-b5e6-96231b3b80d8

Check in the experimental GEP splitter pass. This pass splits complex
GEPs (more than one non-zero index) into simple GEPs (at most one
non-zero index).  In some simple experiments using this it's not
uncommon to see 3% overall code size wins, because it exposes
redundancies that can be eliminated, however it's tricky to use
because instcombine aggressively undoes the work that this pass does.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85144 91177308-0d34-0410-b5e6-96231b3b80d8

Add virtual destructor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85141 91177308-0d34-0410-b5e6-96231b3b80d8

Revert r85134, it breaks mingw build

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85138 91177308-0d34-0410-b5e6-96231b3b80d8

Add CreateZExtOrBitCast and CreateSExtOrBitCast to TargetFolder
for consistency with ConstantFolder.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85137 91177308-0d34-0410-b5e6-96231b3b80d8

When checking whether a def of an aliased register is dead, ask the
machineinstr whether the aliased register is dead, rather than the original
register is dead. This allows it to get the correct answer when examining
an instruction like this:
  CALLpcrel32 <ga:foo>, %AL<imp-def>, %EAX<imp-def,dead>
where EAX is dead but a subregister of it is still live. This fixes PR5294.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85135 91177308-0d34-0410-b5e6-96231b3b80d8

Make PIC16 overlay a loadable pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85134 91177308-0d34-0410-b5e6-96231b3b80d8

Do not use expensive sort().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85130 91177308-0d34-0410-b5e6-96231b3b80d8

Some svn:ignore tweaks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85128 91177308-0d34-0410-b5e6-96231b3b80d8

Break anti-dependence breaking out into its own class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85127 91177308-0d34-0410-b5e6-96231b3b80d8

Add support to encode type info using llvm::Constant.
Patch by Talin!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85126 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a typo in a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85120 91177308-0d34-0410-b5e6-96231b3b80d8

reapply r85085 with a bugfix to avoid infinite looping.
All of the 'demorgan' related xforms need to use
dyn_castNotVal, not m_Not.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85119 91177308-0d34-0410-b5e6-96231b3b80d8

Make LSR's OptimizeShadowIV ignore induction variables with negative
strides for now, because it doesn't handle them correctly. This fixes a
miscompile of SingleSource/Benchmarks/Misc-C++/ray.

This problem was usually hidden because indvars transforms such induction
variables into negations of canonical induction variables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85118 91177308-0d34-0410-b5e6-96231b3b80d8

- Revert some changes from 85044, 85045, and 85047 that broke x86_64 tests and
  bootstrapping. It's not safe to leave identity subreg_to_reg and insert_subreg
  around.
- Relax register scavenging to allow use of partially "not-live" registers. It's
  common for targets to operate on registers where the top bits are undef. e.g.
  s0 =
  d0 = insert_subreg d0<undef>, s0, 1
  ...
     = d0
  When the insert_subreg is eliminated by the coalescer, the scavenger used to
  complain. The previous fix was to keep to insert_subreg around. But that's
  brittle and it's overly conservative when we want to use the scavenger to
  allocate registers. It's actually legal and desirable for other instructions
  to use the "undef" part of d0. e.g.
  s0 =
  d0 = insert_subreg d0<undef>, s0, 1
  ...
  s1 =
     = s1
     = d0
  We probably need add a "partial-undef" marker on machine operand so the
  machine verifier would not complain.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85091 91177308-0d34-0410-b5e6-96231b3b80d8

Revert 85085. It causes infinite looping during llvm-gcc build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85090 91177308-0d34-0410-b5e6-96231b3b80d8

Fix gmake check for AuroraUX triple.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85088 91177308-0d34-0410-b5e6-96231b3b80d8

Move DataTypes.h to include/llvm/System, update all users. This breaks the last
direct inclusion edge from System to Support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85086 91177308-0d34-0410-b5e6-96231b3b80d8

Implement PR3266 & PR5276, folding:
   not (or (icmp, icmp)) -> and(icmp, icmp)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85085 91177308-0d34-0410-b5e6-96231b3b80d8

Update the 'svn:ignore' property to remove stale file references.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85084 91177308-0d34-0410-b5e6-96231b3b80d8

convert or.ll to filecheck and merge or2 into it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85083 91177308-0d34-0410-b5e6-96231b3b80d8

Remove stale reference to ThreadSupport.h.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85082 91177308-0d34-0410-b5e6-96231b3b80d8

fix PR5295 where the .ll parser didn't reject a function after a global
or global after a function with conflicting names.  Update some testcases
that were accidentally depending on this behavior.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85081 91177308-0d34-0410-b5e6-96231b3b80d8

Suppress -Asserts warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85078 91177308-0d34-0410-b5e6-96231b3b80d8

fix PR5186: the JIT shouldn't try to codegen available_externally
functions it should just look them up like declarations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85077 91177308-0d34-0410-b5e6-96231b3b80d8

Remove unused includes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85074 91177308-0d34-0410-b5e6-96231b3b80d8

of -> or

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85065 91177308-0d34-0410-b5e6-96231b3b80d8

80-column cleanup

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85064 91177308-0d34-0410-b5e6-96231b3b80d8

Reapply 85006 with a minor fix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85052 91177308-0d34-0410-b5e6-96231b3b80d8

Add a couple of ARM cross-rc coalescing tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85051 91177308-0d34-0410-b5e6-96231b3b80d8

Update tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85050 91177308-0d34-0410-b5e6-96231b3b80d8

Add ARM getMatchingSuperRegClass to handle S / D / Q cross regclass coalescing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85049 91177308-0d34-0410-b5e6-96231b3b80d8

Don't forget subreg indices when folding load / store.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85048 91177308-0d34-0410-b5e6-96231b3b80d8

Use isIdentityCopy. Fix a bozo bug (flipped condition) in InvalidateRegDef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85047 91177308-0d34-0410-b5e6-96231b3b80d8

Code clean up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85046 91177308-0d34-0410-b5e6-96231b3b80d8

Do not delete identity insert_subreg even if dest is virtual. Let later passes delete them. This avoids register scavenger complain.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85045 91177308-0d34-0410-b5e6-96231b3b80d8

Add isIdentityCopy to check for identity copy (or extract_subreg, etc.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85044 91177308-0d34-0410-b5e6-96231b3b80d8

Remove includes of Support/Compiler.h that are no longer needed after the
VISIBILITY_HIDDEN removal.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85043 91177308-0d34-0410-b5e6-96231b3b80d8

Remove VISIBILITY_HIDDEN from class/struct found inside anonymous namespaces.
Chris claims we should never have visibility_hidden inside any .cpp file but
that's still not true even after this commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85042 91177308-0d34-0410-b5e6-96231b3b80d8

this is done.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85041 91177308-0d34-0410-b5e6-96231b3b80d8

Teach FoldBitCast to be able to handle bitcasts from (e.g.) i128 -> <4 x float>.

This allows us to simplify this:
union vec2d {
    double e[2];
    double v __attribute__((vector_size(16)));
};
typedef union vec2d vec2d;

static vec2d a={{1,2}}, b={{3,4}};

vec2d foo () {
    return (vec2d){ .v = a.v + b.v * (vec2d){{5,5}}.v };
}

down to:

define %0 @foo() nounwind ssp {
entry:
  %mrv5 = insertvalue %0 undef, double 1.600000e+01, 0 ; <%0> [#uses=1]
  %mrv6 = insertvalue %0 %mrv5, double 2.200000e+01, 1 ; <%0> [#uses=1]
  ret %0 %mrv6
}

instead of:

define %0 @foo() nounwind ssp {
entry:
  %mrv5 = insertvalue %0 undef, double extractelement (<2 x double> fadd (<2 x double> fmul (<2 x double> bitcast (<1 x i128> <i128 85174437667405312423031577302488055808> to <2 x double>), <2 x double> <double 3.000000e+00, double 4.000000e+00>), <2 x double> <double 1.000000e+00, double 2.000000e+00>), i32 0), 0 ; <%0> [#uses=1]
  %mrv6 = insertvalue %0 %mrv5, double extractelement (<2 x double> fadd (<2 x double> fmul (<2 x double> bitcast (<1 x i128> <i128 85174437667405312423031577302488055808> to <2 x double>), <2 x double> <double 3.000000e+00, double 4.000000e+00>), <2 x double> <double 1.000000e+00, double 2.000000e+00>), i32 1), 1 ; <%0> [#uses=1]
  ret %0 %mrv6
}

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85040 91177308-0d34-0410-b5e6-96231b3b80d8

move FoldBitCast earlier in the file, and use it instead of
ConstantExpr::getBitCast in various places.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85039 91177308-0d34-0410-b5e6-96231b3b80d8

refactor FoldBitCast to reduce nesting and to always return a constantexpr
instead of returning null on failure.  No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85038 91177308-0d34-0410-b5e6-96231b3b80d8

Remove ICmpInst::isSignedPredicate which was a reimplementation
CmpInst::isSigned.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85037 91177308-0d34-0410-b5e6-96231b3b80d8

Sink isTrueWhenEqual from ICmpInst to CmpInst. Add a matching isFalseWhenEqual
which is equal to !isTrueWhenEqual for ints but not for floats.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85036 91177308-0d34-0410-b5e6-96231b3b80d8

lit: Add --config-prefix option, to override default config file names.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85035 91177308-0d34-0410-b5e6-96231b3b80d8

Indent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85034 91177308-0d34-0410-b5e6-96231b3b80d8

Regenerate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85031 91177308-0d34-0410-b5e6-96231b3b80d8

Document OptionPreprocessor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85030 91177308-0d34-0410-b5e6-96231b3b80d8

Add a test for OptionPreprocessor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85029 91177308-0d34-0410-b5e6-96231b3b80d8

lit: Allow use of /dev/null in redirects on Windows (replace by a temporary
file).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85028 91177308-0d34-0410-b5e6-96231b3b80d8

When the scavenger is looking for a good candidate location to restore from a
spill, it should avoid doing so inside the live range of a virtual register.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85026 91177308-0d34-0410-b5e6-96231b3b80d8

Update these tests to match what Loop::print now prints.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85021 91177308-0d34-0410-b5e6-96231b3b80d8

MapValue doesn't needs its LLVMContext argument.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85020 91177308-0d34-0410-b5e6-96231b3b80d8

Rename isLoopExit to isLoopExiting, for consistency with the wording
used elsewhere - an exit block is a block outside the loop branched to
from within the loop. An exiting block is a block inside the loop that
branches out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85019 91177308-0d34-0410-b5e6-96231b3b80d8

Delete a spurious semicolon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85018 91177308-0d34-0410-b5e6-96231b3b80d8

Make these tests more interesting by using
-verify-dom-info and -verify-loop-info, which enable additional
(expensive) consistency checks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85017 91177308-0d34-0410-b5e6-96231b3b80d8

Rewrite LoopRotation's SSA updating code using SSAUpdater.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85016 91177308-0d34-0410-b5e6-96231b3b80d8

lit: Support '>>' redirections when executing scripts internally.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85014 91177308-0d34-0410-b5e6-96231b3b80d8

Update CMake dependencies.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85013 91177308-0d34-0410-b5e6-96231b3b80d8

Teach macho-dump to dump UUIDs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85012 91177308-0d34-0410-b5e6-96231b3b80d8

Make DominanceFrontierBase::print's output prettier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85011 91177308-0d34-0410-b5e6-96231b3b80d8

Make DominanceFrontier::addBasicBlock return the iterator for the newly
inserted block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85010 91177308-0d34-0410-b5e6-96231b3b80d8

Add an explicit keyword.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85009 91177308-0d34-0410-b5e6-96231b3b80d8

Revert back 85006 for now as it breaks PIC16 tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85008 91177308-0d34-0410-b5e6-96231b3b80d8

Adding support for placing global objects in shared data memory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85006 91177308-0d34-0410-b5e6-96231b3b80d8

various cleanups suggested by Duncan

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84993 91177308-0d34-0410-b5e6-96231b3b80d8

fix PR5287, a serious regression from my previous patches.  Thanks to
Duncan for the nice tiny testcase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84992 91177308-0d34-0410-b5e6-96231b3b80d8

Auto-upgrade free instructions to calls to the builtin free function.
Update all analysis passes and transforms to treat free calls just like FreeInst.
Remove RaiseAllocations and all its tests since FreeInst no longer needs to be raised.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84987 91177308-0d34-0410-b5e6-96231b3b80d8

80 col violation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84986 91177308-0d34-0410-b5e6-96231b3b80d8

Add some asserts to catch copyRegToReg() fails early

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84983 91177308-0d34-0410-b5e6-96231b3b80d8

Restrict Thumb1 register allocation to low registers, even for instructions that
can access the hi regs. Our prologue and epilogue code doesn't know how to
properly handle save/restore of the hi regs, so things go badly when we alloc
them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84982 91177308-0d34-0410-b5e6-96231b3b80d8

Identity copies should not contribute to spill weight.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84978 91177308-0d34-0410-b5e6-96231b3b80d8

FIXME no longer applies. R12 and R3 are available for allocation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84977 91177308-0d34-0410-b5e6-96231b3b80d8

Fix llvm.org/PR4822: allow module deletion after a function has been
compiled.

When functions are compiled, they accumulate references in the JITResolver's
stub maps. This patch removes those references when the functions are
destroyed.  It's illegal to destroy a Function when any thread may still try to
call its machine code.

This patch also updates r83987 to use ValueMap instead of explicit CallbackVHs
and fixes a couple "do stuff inside assert()" bugs from r84522.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84975 91177308-0d34-0410-b5e6-96231b3b80d8

Remove AllocationInst.  Since MallocInst went away, AllocaInst is the only subclass of AllocationInst, so it no longer is necessary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84969 91177308-0d34-0410-b5e6-96231b3b80d8

Fix stylistic and documentation problems in ValueMap found by Nick Lewycky and
Evan Cheng.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84967 91177308-0d34-0410-b5e6-96231b3b80d8

APInt-ify the gep scaling code, so that it correctly handles the case where
the scale overflows pointer-sized arithmetic. This fixes PR5281.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84954 91177308-0d34-0410-b5e6-96231b3b80d8

Make LoopDeletion check the maximum backedge taken count, rather than the
exact backedge taken count, when checking for infinite loops. This allows
it to delete loops with multiple exit conditions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84952 91177308-0d34-0410-b5e6-96231b3b80d8

some stuff is done, we still have constantexpr simplification to do.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84943 91177308-0d34-0410-b5e6-96231b3b80d8

teach libanalysis to simplify vector loads with bitcast sources.  This
implements something out of Target/README.txt producing:

_foo:                                                       ## @foo
movl 4(%esp), %eax
movapd LCPI1_0, %xmm0
movapd %xmm0, (%eax)
ret $4

instead of:

_foo:                                                       ## @foo
movl 4(%esp), %eax
movapd _b, %xmm0
mulpd LCPI1_0, %xmm0
addpd _a, %xmm0
movapd %xmm0, (%eax)
ret $4

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84942 91177308-0d34-0410-b5e6-96231b3b80d8

enhance FoldReinterpretLoadFromConstPtr to handle loads of up to 32
bytes (i256).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84941 91177308-0d34-0410-b5e6-96231b3b80d8

teach libanalysis to fold int and fp loads from almost arbitrary
non-type-safe constant initializers.  This sort of thing happens
quite a bit for 4-byte loads out of string constants, unions,
bitfields, and an interesting endianness check from sqlite, which
is something like this:

const int sqlite3one = 1;
# define SQLITE_BIGENDIAN    (*(char *)(&sqlite3one)==0)
# define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1)
# define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE)

all of these macros now constant fold away.

This implements PR3152 and is based on a patch started by Eli, but heavily
modified and extended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84936 91177308-0d34-0410-b5e6-96231b3b80d8

Add 2.6 release note.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84934 91177308-0d34-0410-b5e6-96231b3b80d8

Update tests for 84931.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84932 91177308-0d34-0410-b5e6-96231b3b80d8

X86 needs critical path anti-dependency breaking.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84931 91177308-0d34-0410-b5e6-96231b3b80d8

Commit fixes for half precision I noted in review, so
they don't get lost; I don't think the originator has
write access.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84928 91177308-0d34-0410-b5e6-96231b3b80d8

This is passing on Darwin PPC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84921 91177308-0d34-0410-b5e6-96231b3b80d8

Minor code cleanup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84919 91177308-0d34-0410-b5e6-96231b3b80d8

Neuter stack protectors by only checking character arrays. This is what GCC
does.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84916 91177308-0d34-0410-b5e6-96231b3b80d8