llvm-svn: 135979

llvm-svn: 135978

assert-path code, as previously we would have fallen off the end of the
function, but please review and let me know if this should go somewhere
else.

This fixes a Clang warning:
lib/MC/MCMachOStreamer.cpp:201:11: error: enumeration value 'MCSA_IndirectSymbol' not handled in switch [-Werror,-Wswitch-enum]
  switch (Attribute) {
          ^
1 error generated.

llvm-svn: 135976

llvm-svn: 135975

llvm-svn: 135974

llvm-svn: 135973

The shift immediate encoding, printing, etc. is handled directly by the
enclosing operand definition, so it should be a vanilla immediate, not a
nested complex operand (shift_imm).

llvm-svn: 135968

llvm-svn: 135966

llvm-svn: 135963

llvm-svn: 135959

llvm-svn: 135958

llvm-svn: 135954

llvm-svn: 135953

Update the comment. This feature is available only on Darwin at the moment. Though it's not Darwin-specific.

llvm-svn: 135951

llvm-svn: 135950

llvm-svn: 135949

Remove some inititalizers that are the same as the default, move defs next to
their (singular) uses and generally simplify some formatting of asm operand
definitions.

llvm-svn: 135946

llvm-svn: 135945

llvm-svn: 135943

llvm-svn: 135942

llvm-svn: 135939

MachineBlockFrequencyInfo.

llvm-svn: 135937

llvm-svn: 135930

llvm-svn: 135924

llvm-svn: 135923

unwind encoding for that function. This simply crawls through the prolog looking
for machine instrs marked as "frame setup". It can calculate from these what the
compact unwind should look like.

This is currently disabled because of needed linker support. But initial tests
look good.

llvm-svn: 135922

The .local, .hidden, .internal, and .protected are not legal for all supported
file formats (in particular, they're invalid for MachO). Move the parsing for
them into the ELF assembly parser since that's the format they're for.
Similarly, .weak is used by COFF and ELF, but not MachO, so move the parsing
to the COFF and ELF asm parsers. Previously, using any of these directives
on Darwin would result in an assertion failure in the parser; now we get
a diagnostic as we should.

rdar://9827089

llvm-svn: 135921

llvm-svn: 135917

This mechanism already exists, but the RS_Split2 stage makes it clearer.

When live range splitting creates ranges that may not be making
progress, they are marked RS_Split2 instead of RS_New. These ranges may
be split again, but only in a way that can be proven to make progress.

For local ranges, that means they must be split into ranges used by
strictly fewer instructions.

For global ranges, region splitting is bypassed and the RS_Split2
ranges go straight to per-block splitting.

llvm-svn: 135912

The stage is used to control where a live range is going, not where it
is coming from. Live ranges created by splitting will usually be marked
RS_New, but some are marked RS_Spill to avoid wasting time trying to
split them again.

The old RS_Global and RS_Local stages are merged - they are really the
same thing for local and global live ranges.

llvm-svn: 135911

llvm-svn: 135910

llvm-svn: 135905

llvm-svn: 135904

llvm-svn: 135889

to eliminate some casting.

llvm-svn: 135888

llvm-svn: 135886

This fixes PR10463. A two-address instruction with an <undef> use
operand was incorrectly rewritten so the def and use no longer used the
same register, violating the tie constraint.

Fix this by always rewriting <undef> operands with the register a def
operand would use.

llvm-svn: 135885

llvm-svn: 135866

This method computes the edge bundles that should be live when splitting
around a compact region. This is independent of interference.

The function returns false if the live range was already a compact
region, or the compact region doesn't have any live bundles - it would
be the same as splitting around basic blocks.

Compact regions are computed using the normal spill placement code. We
pretend there is interference in all live-through blocks that don't use
the live range. This removes all edges from the Hopfield network used
for spill placement, so it converges instantly.

llvm-svn: 135847

If there is no interference and no last split point, we cannot
enterIntvBefore(Stop) - that function needs a real instruction.

Use enterIntvAtEnd instead for that very easy case.

This code doesn't currently run, it is needed by multi-way splitting.

llvm-svn: 135846