Dan noted that this would work on the case shown on the commit message. I think
the case that was failing was a bb ending with a redundant conditional jump:

...
jne foo

foo:
...

I was unable to find any such case in the tests or in a debug build of clang,
so I will revert this part of the patch and watch the bots.

llvm-svn: 133004

AnalyzeBranch.

llvm-svn: 132981

Add a triple to the tests.

llvm-svn: 132885

llvm-svn: 132883

we try to branch to them.

Before we were creating successor lists with duplicated entries. Fixing that
found a bug in isBlockOnlyReachableByFallthrough that would causes it to
return the wrong answer for

-----------
...
jne foo
jmp bar

foo:
----------

llvm-svn: 132882

and definitions when emitting global variables.  This was causing global 
declarations to be emitted as if they were definitions.
Fixes <rdar://problem/9429892>.

llvm-svn: 132825

llvm-svn: 132250

There was no way to check if a given register/mode pair was valid. We now return
an error code (-2) instead of asserting. If anyone thinks that an assert
at this point  is really needed, we can autogen a hasValidDwarfRegNum instead.

llvm-svn: 132236

the Win64 EH mechanism to implement GCC-style exceptions. LLVM supports
hardly anything else at this point!

llvm-svn: 132234

subregisters:

When a value is in a subregister, at least report the location as being
the superregister. We should extend the .td files to encode the bit
range so that we can produce a DW_OP_bit_piece.

llvm-svn: 132224

llvm-svn: 132222

LTO friendly as we can now correctly merge files compiled with or without
-fasynchronous-unwind-tables.

llvm-svn: 132033

llvm-svn: 131151

this clang will use .debug_frame in, for example,
clang -g -c -m32 test.c
This matches gcc's behaviour. It looks like .debug_frame is a bit bigger
than .eh_frame, but has the big advantage of not being allocated.

llvm-svn: 131140

llvm-svn: 130989

llvm-svn: 130984

llvm-svn: 130959

llvm-svn: 130947

llvm-svn: 130944

Hoist MCLineEntry construction AsmPrinter so that anyone who derives from AsmPrinter can have line number entries.
PR 9810

llvm-svn: 130518

llvm-svn: 130501

This fixes clang generated blocks' variables' debug info.
Radar 9279956.

llvm-svn: 130373

llvm-svn: 130326

llvm-svn: 130232

symbols.  For example, don't emit:
        .comm   _i,4,2                  ## @i
                                        ## @i

instead emit:
        .comm   _i,4,2                  ## @i

llvm-svn: 130192

Remove previous DwarfCFI hack.

llvm-svn: 130187

Let dwarf writer allocate extra space in the debug location expression. This space, if requested, will be used for complex addresses of the Blocks' variables.

llvm-svn: 130178

llvm-svn: 129938

llvm-svn: 129715

llvm-svn: 129600

Change ELF systems to use CFI for producing the EH tables. This reduces the
size of the clang binary in Debug builds from 690MB to 679MB.

llvm-svn: 129571

It broke several builds.

llvm-svn: 129557

size of the clang binary in Debug builds from 690MB to 679MB.

llvm-svn: 129518

llvm-svn: 128887

llvm-svn: 128504

llvm-svn: 127099

r124468.  Patch by Rafael Avila de Espindola!

llvm-svn: 126297

llvm-svn: 125563

llvm-svn: 125225

llvm-svn: 124468