While extracting lexical scopes from machine instruction stream, work on one machine basic block at a time. 

llvm-svn: 136106

llvm-svn: 136105

rdar://9842203

llvm-svn: 136102

exit. Added an interfaces for querying either the loop's exact/max
backedge taken count or a specific loop exit's not-taken count.

llvm-svn: 136100

llvm-svn: 136099

llvm-svn: 136098

llvm-svn: 136096

No intendeded functional change. Just cleaning up a bit to make things more
self-consistent in layout and style.

llvm-svn: 136095

llvm-svn: 136091

llvm-svn: 136090

llvm-svn: 136089

llvm-svn: 136088

a GNU userspace).

llvm-svn: 136085

llvm-svn: 136083

llvm-svn: 136082

llvm-svn: 136080

way for i1 and vector of i1 types.  Use these to make some code
more self-documenting.

llvm-svn: 136079

llvm-svn: 136074

llvm-svn: 136068

and Jeffrey Bosboom!

llvm-svn: 136066

llvm-svn: 136065

Describe the reasoning for compact unwind in better terms. Thanks to Nick Kledzik for the description.

llvm-svn: 136064

llvm-svn: 136051

support for 256-bit versions (but no instruction selection yet, coming next).

llvm-svn: 136050

llvm-svn: 136049

llvm-svn: 136048

27 insertions(+), 62 deletions(-)

llvm-svn: 136047

When dead code elimination deletes a PHI value, the virtual register may
split into multiple connected components. In that case, revert each
component to the RS_Assign stage.

The new components are guaranteed to be smaller (the original value
numbers are distributed among the components), so this will always be
making progress. The components are now allowed to evict other live
ranges or be split again.

llvm-svn: 136034

llvm-svn: 136031

llvm-svn: 136030

Rename TargetAsmParser to MCTargetAsmParser and TargetAsmLexer to MCTargetAsmLexer; rename createAsmLexer to createMCAsmLexer and createAsmParser to createMCAsmParser.

llvm-svn: 136027

dependence on CodeGen layers and backends from the MC layers.

llvm-svn: 136024

The first problem to fix is to stop creating synthetic *Table_gen
targets next to all of the LLVM libraries. These had no real effect as
CMake specifies that add_custom_command(OUTPUT ...) directives (what the
'tablegen(...)' stuff expands to) are implicitly added as dependencies
to all the rules in that CMakeLists.txt.

These synthetic rules started to cause problems as we started more and
more heavily using tablegen files from *subdirectories* of the one where
they were generated. Within those directories, the set of tablegen
outputs was still available and so these synthetic rules added them as
dependencies of those subdirectories. However, they were no longer
properly associated with the custom command to generate them. Most of
the time this "just worked" because something would get to the parent
directory first, and run tablegen there. Once run, the files existed and
the build proceeded happily. However, as more and more subdirectories
have started using this, the probability of this failing to happen has
increased. Recently with the MC refactorings, it became quite common for
me when touching a large enough number of targets.

To add insult to injury, several of the backends *tried* to fix this by
adding explicit dependencies back to the parent directory's tablegen
rules, but those dependencies didn't work as expected -- they weren't
forming a linear chain, they were adding another thread in the race.

This patch removes these synthetic rules completely, and adds a much
simpler function to declare explicitly that a collection of tablegen'ed
files are referenced by other libraries. From that, we can add explicit
dependencies from the smaller libraries (such as every architectures
Desc library) on this and correctly form a linear sequence. All of the
backends are updated to use it, sometimes replacing the existing attempt
at adding a dependency, sometimes adding a previously missing dependency
edge.

Please let me know if this causes any problems, but it fixes a rather
persistent and problematic source of build flakiness on our end.

llvm-svn: 136023

llvm-svn: 136013

llvm-svn: 136012

llvm-svn: 136010

Initial implementation of 'fence' instruction, the new C++0x-style replacement for llvm.memory.barrier.

This is just a LangRef entry and reading/writing/memory representation; optimizer+codegen support coming soon.

llvm-svn: 136009

llvm-svn: 136008

I will save before I commit.
I will save before I commit.
I will save before I commit.

llvm-svn: 136007

llvm-svn: 136006