Added major new capabilities to scheduler (only BURR for now) to support physical register dependency. The BURR scheduler can now backtrace and duplicate instructions in order to avoid "expensive / impossible to copy" values (e.g. status flag EFLAGS for x86) from being clobbered.

llvm-svn: 42284

llvm-svn: 42283

llvm-svn: 42282

have situations where an SSE instruction turns into
multiple blocks, with the live range of an x87
register crossing them.  To do this correctly make
sure we examine all blocks when inserting
FP_REG_KILL.  PR 1697.  (This was exposed by my
fix for PR 1681, but the same thing could happen
mixing x87 long double with SSE.)

llvm-svn: 42281

llvm-svn: 42280

llvm-svn: 42279

instead of ISD::LABEL with a manual .debug_line entry when the assembler
supports .file and .loc directives.

llvm-svn: 42278

such as will happen when .loc directives are used.

llvm-svn: 42277

consistency with the other currently empty sections.

llvm-svn: 42276

use with .loc directives.

llvm-svn: 42275

aren't really usable without each other. 

llvm-svn: 42274

Fixes PR1698.

llvm-svn: 42273

file numbers to use with .loc directives.

llvm-svn: 42272

Fixed some comments

llvm-svn: 42271

llvm-svn: 42270

and time usage.
Fixup operator == to make this work, and add a resize method to DenseMap
so we can resize our hashtable once we know how big it should be.

llvm-svn: 42269

llvm-svn: 42268

code that creates the label too.

llvm-svn: 42265

in ExpandEXTRACT_VECTOR_ELT and SplitVectorOp. This fixes an abort
in the included testcase.

llvm-svn: 42264

llvm-svn: 42262

asm to die with:

ScheduleDAG.cpp:269: failed assertion `false && "Couldn't find the register class"'

instead of:
failed assertion `RegMap->getRegClass(VReg) == RC && "Register class of operand and regclass of use don't agree!"'

yay.

llvm-svn: 42259

llvm-svn: 42257

The two remaining unmerged parts are DFSPass, and the Calculate().

llvm-svn: 42255

-1. / -0.

llvm-svn: 42254

into a separate header file.

Next step: merging PostDominatorCalculation.h with DominatorCalculation.h.

llvm-svn: 42251

and the PostDomTree version first.

llvm-svn: 42250

llvm-svn: 42249

change is not useful in and of itself, but it lays the groundwork for combining
the dominator and postdominator implementations.

Also, factor a few methods that are common to DominatorTree and PostDominatorTree
into DominatorTreeBase.  Again, this will make merging the two calculation methods
simpler in the future.

llvm-svn: 42248

keep f32 in SSE registers and f64 in x87.  This
is effectively a new codegen mode.
Change addLegalFPImmediate to permit float and
double variants to do different things.
Adjust callers.

llvm-svn: 42246

llvm-svn: 42239

llvm-svn: 42222

llvm-svn: 42220

bit width instead of number of words allocated, which
makes it actually work for int->APF conversions.
Adjust callers.  Add const to one of the APInt constructors
to prevent surprising match when called with const
argument.

llvm-svn: 42210

llvm-svn: 42209

llvm-svn: 42205

llvm-svn: 42204

llvm-svn: 42193

Implement calls to functions with byval arguments on X86

llvm-svn: 42192

llvm-svn: 42189

speedup for GVN.

llvm-svn: 42185