When a virtual register has a single value that is defined as a copy of a
reserved register, permit that copy to be joined. These virtual register are
usually copies of the stack pointer:

  %vreg75<def> = COPY %ESP; GR32:%vreg75
  MOV32mr %vreg75, 1, %noreg, 0, %noreg, %vreg74<kill>
  MOV32mi %vreg75, 1, %noreg, 8, %noreg, 0
  MOV32mi %vreg75<kill>, 1, %noreg, 4, %noreg, 0
  CALLpcrel32 ...

Coalescing these virtual registers early decreases register pressure.
Previously, they were coalesced by RALinScan::attemptTrivialCoalescing after
register allocation was completed.

The lower register pressure causes the mcinst-lowering-cmp0.ll test case to fail
because it depends on linear scan spilling a particular register.

I am deleting 2008-08-05-SpillerBug.ll because it is counting the number of
instructions emitted, and its revision history shows the 'correct' count being
edited many times.

llvm-svn: 128845

llvm-svn: 128844

-Wuninitialized: use "self-init" warning when issue uninitialized values warnings from the dataflow analysis that include within the initializer of a variable.

llvm-svn: 128843

llvm-svn: 128842

rdar://problem/9225433

llvm-svn: 128841

llvm-svn: 128840

llvm-svn: 128839

-Wuninitialized: don't issue fixit for initializer if a variable declaration already has an initializer.

llvm-svn: 128838

GDBRemoteCommunicationServer classes. This involved adding a new packet
named "qSpeedTest" which can test the speed of a packet send/response pairs
using a wide variety of send/recv packet sizes.

Added a few new connection classes: one for shared memory, and one for using
mach messages (Apple only). The mach message stuff is experimental and not 
working yet, but added so I don't lose the code. The shared memory stuff
uses pretty standard calls to setup shared memory.

llvm-svn: 128837

This causes defs to dominate uses, no instructions after terminators, and other
goodness.

llvm-svn: 128836

The code inserted by PPCTargetLowering::EmitInstrWithCustomInserter for ppc64 is
wrong, and I don't know how to fix it. It seems to be using the correct register
classes for pointers, but it inserts all 32-bit instructions.

llvm-svn: 128835

llvm-svn: 128834

When emitting a "too many arguments to function call..." error, also include a note with a location for the function prototype.

llvm-svn: 128833

  also fix the encoding of the later.
- Add a new encoding bit to describe the index mode used in AM3.
- Teach printAddrMode3Operand to check by the addressing mode which
  index mode to print.
- Testcases.

llvm-svn: 128832

llvm-svn: 128831

Move transformation of JmpLink and related nodes done during instruction selection to Legalize phase.

llvm-svn: 128830

llvm-svn: 128829

The 32-bit R0 cannot be used where a 64-bit register is expected.

llvm-svn: 128828

llvm-svn: 128827

llvm-svn: 128826

Sandeep Patel noticed that the alignment was wrong for Neon vector types,
and this change is partly derived from his patch.  For the APCS ABI, however,
additional changes were required: the maximum ABI alignment is 32 bits and
the preferred alignment for i64 and f64 types should be 64 bits.

llvm-svn: 128825

llvm-svn: 128823

Define most shift masks incrementally to reduce the redundant
hard-coding. Introduce new shift for the VEX flags to replace the
magic constant 32 in various places.

llvm-svn: 128822

llvm-svn: 128821

llvm-svn: 128820

llvm-svn: 128819

llvm-svn: 128818

llvm-svn: 128812

returning a scalar value in a function whose return type is a single-
element structure or array.

llvm-svn: 128810

llvm-svn: 128809

Contributed by: etherzhhb@gmail.com

llvm-svn: 128808

llvm-svn: 128807

I'm pretty sure this is the right fix, but I would appreciate it if someone
else would double-check.

llvm-svn: 128806

ref_cnt mutable and Retain/Release const to enable reference counted
pointers to const objects

llvm-svn: 128804

llvm-commits.  (Not sure why it only breaks on Windows; maybe it has
something to do with the iterator representation...)

llvm-svn: 128802

separate executable.

llvm-svn: 128801

llvm-svn: 128800

 - Adds support for sniffing PE/COFF files on win32 (.exe and .dll)
   which are COFF files that have an MS-DOS compatibility stub on
   the front of them.

 - Fixes a bug in the COFFObjectFile's support for the Microsoft COFF
   extension for long symbol names, wherein it was attempting to parse
   the leading '/' in an extended symbol name reference as part of the
   integer offset.

 - Fixes bugs in COFFObjectFile and ELFObjectFile wherein section
   and symbol iterators were being returned with uninitialized bytes;
   the type DataRefImpl is a union between 2 32-bit words (d.a and d.b)
   and a single intptr_t word (p). Only p was being initialized, so in
   32-bit builds the result would be iterators with random upper 32-bit
   words in their DataRefImpls. This caused random failures when
   seeking around in object files.

Patch by Graydon Hoare!

llvm-svn: 128799

Patch by Patrick Walton!

llvm-svn: 128798

llvm-svn: 128797