llvm-svn: 122513

llvm-svn: 122509

llvm-svn: 122507

llvm-svn: 122506

See http://caml.inria.fr/mantis/view.php?id=4166
If we call only external functions from a module, then its 'let _' bindings
don't get executed, which means that the exceptions don't get registered for use
in the C code.
This in turn causes llvm_raise to call raise_with_arg() with a NULL pointer and
cause a segmentation fault.

The workaround is to declare all 'external' functions as 'val' in these .mli
files.

Also added a separate testcase (the testcase must call only external functions
for the bug to occur).

llvm-svn: 122497

Remove/fix invalid README entries. The well thought out strcpy function doesn't return a pointer to the end of the string.

llvm-svn: 122496

llvm-svn: 122495

llvm-svn: 122491

Converted LiveRegCycles to LiveRegGens. It's easier to work with and allows multiple nodes per cycle.

llvm-svn: 122474

llvm-svn: 122473

In the bottom-up selection DAG scheduling, handle two-address
instructions that read/write unspillable registers. Treat
the entire chain of two-address nodes as a single live range.

llvm-svn: 122472

llvm-svn: 122462

new gcc warning that complains on self-assignments and
self-initializations.

llvm-svn: 122458

llvm-svn: 122457

llvm-svn: 122456

DAGCombine add (sext i1), X into sub X, (zext i1) if sext from i1 is illegal.  The latter usually compiles into smaller code.

example code:
unsigned foo(unsigned x, unsigned y) {
  if (x != 0) y--;
  return y;
}

before:
  _foo:                           ## @foo
    cmpl  $1, 4(%esp)             ## encoding: [0x83,0x7c,0x24,0x04,0x01]
    sbbl  %eax, %eax              ## encoding: [0x19,0xc0]
    notl  %eax                    ## encoding: [0xf7,0xd0]
    addl  8(%esp), %eax           ## encoding: [0x03,0x44,0x24,0x08]
    ret                           ## encoding: [0xc3]

after:
  _foo:                           ## @foo
    cmpl  $1, 4(%esp)             ## encoding: [0x83,0x7c,0x24,0x04,0x01]
    movl  8(%esp), %eax           ## encoding: [0x8b,0x44,0x24,0x08]
    adcl  $-1, %eax               ## encoding: [0x83,0xd0,0xff]
    ret                           ## encoding: [0xc3]

llvm-svn: 122455

llvm-svn: 122453

  int test(unsigned long a, unsigned long b) { return -(a < b); }
compiles to
  _test:                              ## @test
    cmpq  %rsi, %rdi                  ## encoding: [0x48,0x39,0xf7]
    sbbl  %eax, %eax                  ## encoding: [0x19,0xc0]
    ret                               ## encoding: [0xc3]
instead of
  _test:                              ## @test
    xorl  %ecx, %ecx                  ## encoding: [0x31,0xc9]
    cmpq  %rsi, %rdi                  ## encoding: [0x48,0x39,0xf7]
    movl  $-1, %eax                   ## encoding: [0xb8,0xff,0xff,0xff,0xff]
    cmovael %ecx, %eax                ## encoding: [0x0f,0x43,0xc1]
    ret                               ## encoding: [0xc3]

llvm-svn: 122451

fixed.

llvm-svn: 122448

llvm-svn: 122447

if we have a lame assembler.

llvm-svn: 122446

pick the victim with the lowest total spill weight.

llvm-svn: 122445

llvm-svn: 122444

better name and matches what is used in the MachO writer.

llvm-svn: 122443

llvm-svn: 122441

llvm-svn: 122438

llvm-svn: 122427

llvm-svn: 122419

the original instruction, half the cases were missed (making it not
wrong but suboptimal).  Also correct a typo (A <-> B) in the second
chunk. 

llvm-svn: 122414

llvm-svn: 122413

esp. important given that the LOCAL_SECTDIFF enumeration got redefined.

llvm-svn: 122412

MC/Mach-O/ARM: Clone off an ARM version of RecordScatteredRelocation until I figure out how it is supposed to work.

llvm-svn: 122410

llvm-svn: 122409

llvm-svn: 122408

llvm-svn: 122407

llvm-svn: 122406

llvm-svn: 122405

llvm-svn: 122404

RecordRelocation with lots of FIXMEs.

llvm-svn: 122402

llvm-svn: 122401