Change the x86 backend to use extract_subreg for truncation operations. Passes DejaGnu, SingleSource and MultiSource.

llvm-svn: 40578

AsmPrinter::doFinalization.

llvm-svn: 40487

llvm-svn: 40441

llvm-svn: 36287

llvm-svn: 36265

it is defined in.

llvm-svn: 36196

confusion with external linkage types.

llvm-svn: 33663

llvm-svn: 33187

llvm-svn: 32703

llvm-svn: 32685

llvm-svn: 32676

Turn on -Wunused and -Wno-unused-parameter. Clean up most of the resulting
fall out by removing unused variables. Remaining warnings have to do with
unused functions (I didn't want to delete code without review) and unused
variables in generated code. Maintainers should clean up the remaining
issues when they see them. All changes pass DejaGnu tests and Olden.

llvm-svn: 31380

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

llvm-svn: 31171

This patch implements the first increment for the Signless Types feature.
All changes pertain to removing the ConstantSInt and ConstantUInt classes
in favor of just using ConstantInt.

llvm-svn: 31063

llvm-svn: 30742

llvm-svn: 30737

llvm-svn: 30608

llvm-svn: 30549

DLL* linkages got full (I hope) codegeneration support in C & both x86
assembler backends.
External weak linkage added for future use, we don't provide any
codegeneration, etc. support for it.

llvm-svn: 30374

llvm-svn: 30177

llvm-svn: 30162

llvm-svn: 30126

llvm-svn: 28606

llvm-svn: 28493

llvm-svn: 28324

Implement MASM sections correctly, without a "has masm sections flag" and a bunch of special case code.

llvm-svn: 28194

llvm-svn: 28190

llvm-svn: 28187

it wants it emitted to _text/_data.

llvm-svn: 28185

llvm-svn: 28184

movw. That is we promote the destination operand to r16. So
        %CH = TRUNC_R16_R8 %BP
is emitted as
        movw %bp, %cx.

This is incorrect. If %cl is live, it would be clobbered.
Ideally we want to do the opposite, that is emitted it as
        movb ??, %ch
But this is not possible since %bp does not have a r8 sub-register.

We are now defining a new register class R16_ which is a subclass of R16
containing only those 16-bit registers that have r8 sub-registers (i.e.
AX - DX). We isel the truncate to two instructions, a MOV16to16_ to copy the
value to the R16_ class, followed by a TRUNC_R16_R8.

Due to bug 770, the register colaescer is not going to coalesce between R16 and
R16_. That will be fixed later so we can eliminate the MOV16to16_. Right now, it
can only be eliminated if we are lucky that source and destination registers are
the same.

llvm-svn: 28164

llvm-svn: 28148

that gets emitted as movl (for r32 to i16, i8) or a movw (for r16 to i8). And
if the destination gets allocated a subregister of the source operand, then
the instruction will not be emitted at all.

llvm-svn: 28119

llvm-svn: 28104

llvm-svn: 28099

llvm-svn: 28096

llvm-svn: 28093

llvm-svn: 28091

basic block labels, consolidating the code to do so in one place for each
target.

llvm-svn: 28050