2. Added partial debug support for mingw\cygwin targets (the same as
   Linux\ELF). Please note, that currently mingw\cygwin uses 'stabs' format
   for storing debug info by default, thus many (runtime) libraries has
   this information included. These formats shouldn't be mixed in one binary
   ('stabs' & 'DWARF'), otherwise binutils tools will be confused.

llvm-svn: 31311

we don't support a specific constraint yet.  When this happens, print the
unsupported constraint.

llvm-svn: 31310

llvm-svn: 31309

llvm-svn: 31308

llvm-svn: 31307

Defaulting second arguments of SwitchTo*Section, this should make things
somehow clearer.

llvm-svn: 31306

llvm-svn: 31305

llvm-svn: 31304

llvm-svn: 31303

llvm-svn: 31302

condition.  This fixes miscompilation of Olden/bh and many others.

llvm-svn: 31301

the default is actually true.

llvm-svn: 31300

generated object modules to be debugged with gdb. Hopefully this helps
pre-release debugging.

llvm-svn: 31299

llvm-svn: 31298

llvm-svn: 31297

llvm-svn: 31296

llvm-svn: 31295

llvm-svn: 31294

llvm-svn: 31293

llvm-svn: 31292

llvm-svn: 31291

llvm-svn: 31290

more string-like.

llvm-svn: 31289

llvm-svn: 31288

llvm-svn: 31287

to some other type.

llvm-svn: 31286

I'm about to add.  This is similar to, but necessarily different than, the
STL allocator class.

llvm-svn: 31285

llvm-svn: 31284

llvm-svn: 31283

successors), and make island block movement more general.

This compiles CodeGen/X86/2006-04-27-ISelFoldingBug.ll to:

_loadAndRLEsource_no_exit_2E_1_label_2E_0:
        subl $8, %esp
        movl %esi, 4(%esp)
        movl %ebx, (%esp)
        movl 16(%esp), %eax
        movl 12(%esp), %ecx
LBB1_3: #label.0
        movl _last, %edx
        movl %edx, %esi
        incl %esi
        movl %esi, _last
        movl %ecx, %ebx
        # TRUNCATE movb %bl, %bl
        movl _block, %esi
        movb %bl, 1(%esi,%edx)
        cmpl %eax, _last
        jge LBB1_2      #codeRepl5.exitStub
LBB1_4: #label.0
        cmpl $257, %ecx
        je LBB1_2       #codeRepl5.exitStub
LBB1_1: #label.0.no_exit.1_crit_edge.exitStub
        movl $1, %eax
        movl (%esp), %ebx
        movl 4(%esp), %esi
        addl $8, %esp
        ret
LBB1_2: #codeRepl5.exitStub
        xorl %eax, %eax
        movl (%esp), %ebx
        movl 4(%esp), %esi
        addl $8, %esp
        ret

instead of:

_loadAndRLEsource_no_exit_2E_1_label_2E_0:
        subl $8, %esp
        movl %esi, 4(%esp)
        movl %ebx, (%esp)
        movl 16(%esp), %eax
        movl 12(%esp), %ecx
        jmp LBB1_3      #label.0
LBB1_1: #label.0.no_exit.1_crit_edge.exitStub
        movl $1, %eax
        movl (%esp), %ebx
        movl 4(%esp), %esi
        addl $8, %esp
        ret
LBB1_2: #codeRepl5.exitStub
        xorl %eax, %eax
        movl (%esp), %ebx
        movl 4(%esp), %esi
        addl $8, %esp
        ret
LBB1_3: #label.0
        movl _last, %edx
        movl %edx, %esi
        incl %esi
        movl %esi, _last
        movl %ecx, %ebx
        # TRUNCATE movb %bl, %bl
        movl _block, %esi
        movb %bl, 1(%esi,%edx)
        cmpl %eax, _last
        jge LBB1_2      #codeRepl5.exitStub
LBB1_4: #label.0
        cmpl $257, %ecx
        jne LBB1_1      #label.0.no_exit.1_crit_edge.exitStub
        jmp LBB1_2      #codeRepl5.exitStub

... which is much better layout :)

llvm-svn: 31282

llvm-svn: 31281

llvm-svn: 31280

used by comparisons in the main block.

llvm-svn: 31279

llvm-svn: 31278

llvm-svn: 31277

llvm-svn: 31276

llvm-svn: 31275

edges whose destinations are not phi nodes don't bother us.  Also, share
split edges, since the split edge can't have a phi.  This significantly
reduces the complexity of generated code in some cases.

llvm-svn: 31274

jump tables that are dead.

llvm-svn: 31273

llvm-svn: 31272