llvm-svn: 146001

This was actually a bit of a mess. TLI.setPrefLoopAlignment was clearly
documented as taking log2(bytes) units, but the x86 target would still
set a preferred loop alignment of '16'.

CodePlacementOpt passed this number on to the basic block, and
AsmPrinter interpreted it as bytes.

Now both MachineFunction and MachineBasicBlock use logarithmic
alignments.

Obviously, MachineConstantPool still measures alignments in bytes, so we
can emulate the thrill of using as.

llvm-svn: 145889

Maybe some targets should use this as well.

Patch by Evgeniy Stepanov!

llvm-svn: 145781

has a reference to it. Unfortunately, that doesn't work for codegen passes
since we don't get notified of MBB's being deleted (the original BB stays).

Use that fact to our advantage and after printing a function, check if
any of the IL BBs corresponds to a symbol that was not printed. This fixes
pr11202.

llvm-svn: 144674

llvm-svn: 143799

llvm-svn: 143097

Teach the MC to output code/data region marker labels in MachO and ELF modes.  These are used by disassemblers to provide better disassembly, particularly on targets like ARM Thumb that like to intermingle data in the TEXT segment.

llvm-svn: 141135

llvm-svn: 140784

llvm-svn: 139015

- On COFF the .lcomm directive has an alignment argument.
- On ELF we fall back to .local + .comm

Based on a patch by NAKAMURA Takumi.

Fixes PR9337, PR9483 and PR10128.

llvm-svn: 138976

Stores sizes as uint64_t to avoid possible truncation.

llvm-svn: 138901

Emit a repeated sequence of bytes using .zero.  This saves an enormous
amount of asm file space for certain programs.

llvm-svn: 138864

when outputting them.  With this, the entire LLVM testsuite
passes when built with dragonegg.

llvm-svn: 138724

llvm-svn: 136609

There is still a bit more refactoring left to do in Targets. But we are now very
close to fixing all the layering issues in MC.

llvm-svn: 135611

llvm-svn: 135478

llvm-svn: 135450

llvm-svn: 135375

llvm-svn: 133821

is larger than the sum of the elements (including per-element padding).

llvm-svn: 133631

const Constant *.

llvm-svn: 133400

llvm-svn: 133083

llvm-svn: 133007

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