Stack slot real estate is virtually free compared to registers, so it is
advantageous to spill earlier even though the same value is now kept in both a
register and a stack slot.

Also eliminate redundant spills by extending the stack slot live range
underneath reloaded registers.

This can trigger a dead code elimination, removing copies and even reloads that
were only feeding spills.

llvm-svn: 127868

llvm-svn: 127867

a while back.

llvm-svn: 127866

Tweak CrashRecoveryContextCleanup::createCleanup() to use the 'delete' cleanup as opposed to the 'destructor' cleanup (reclaims more memory).

llvm-svn: 127865

Construct 'Sema' object on the stack, so that crash recovery can recovery it's associated resources without walking over dead stack space.

llvm-svn: 127864

llvm-svn: 127863

www/hacking.html: Cosmetic change, to detabify, eliminate whitespace, and add proper slashes to URL.

llvm-svn: 127862

MSYS substitutes path (that begins with "/") to de-mounted Windows path, even if it were nonexistent.
"/foo/bar" might be substituted to "C:/msysgit/foo/bar".

llvm-svn: 127861

MSYS substitutes path (that begins with "/") to de-mounted Windows path.
"/tmp" might be substituted as "C:/DOCUME~1/chapuni/LOCALS~1/Temp".

llvm-svn: 127860

llvm-svn: 127859

llvm-svn: 127858

This is not supposed to happen, but I have seen the x86 rematter getting
confused when rematerializing partial redefs.

llvm-svn: 127857

and early clobbers.

Assert when trying to find an undefined value.

llvm-svn: 127856

Add new CrashRecoveryContextCleanup subclass: CrashRecoveryContextDeleteCleanup.  This deletes the object, not just calls its destructor.

llvm-svn: 127855

Issue this as an IR-gen error;  it's not really worthwhile doing this
"right", i.e. in Sema, because IR gen knows a lot of tricks beyond
what the constant evaluator knows.

llvm-svn: 127854

llvm-svn: 127853

comparisons on x86.  Essentially, the way this works is that SUB+SBB sets
the relevant flags the same way a double-width CMP would.

This is a substantial improvement over the generic lowering in LLVM. The output
is also shorter than the gcc-generated output; I haven't done any detailed
benchmarking, though.

llvm-svn: 127852

Use CrashRecoveryContextCleanup objects to recover an ASTUnit if we crash in ASTUnit::LoadFromCommandLine() and ASTUnit::LoadFromCompilerInvocation().

llvm-svn: 127851

Use CrashRecoveryContextCleanup objects to release resources associated with Sema during a crash while parsing.

llvm-svn: 127850

Augment CrashRecoveryContext to have registered "cleanup" objects that can be used to release resources during a crash.

llvm-svn: 127849

llvm-svn: 127848

llvm-svn: 127847

CharUnits. No change in functionality intended.

llvm-svn: 127846

llvm-svn: 127845

functionality intended.

llvm-svn: 127844

Remove the offending logic and update the test cases.

llvm-svn: 127843

llvm-svn: 127842

ObjC runtime for print object to Pointer AND Integer (from just pointer.)

llvm-svn: 127841

llvm-svn: 127840

SCEV may generate expressions composed of multiple pointers, which can
lead to invalid GEP expansion. Until we can teach SCEV to follow strict
pointer rules, make sure no bad GEPs creep into IR.
Fixes rdar://problem/9038671.

llvm-svn: 127839

Make all the codee that attempts to read the PC consistently use
ReadCoreReg (which 'does the right thing', adding to pc when needed);
fixed places in code where extra addition was being passed along.

Fix bug in insn tables.

llvm-svn: 127838

llvm-svn: 127837

disable Obj-C exceptions.

llvm-svn: 127836

instead of copying.

llvm-svn: 127835

This is done by lowering dbg.declare intrinsic into dbg.value intrinsic.
Radar 9143931.

llvm-svn: 127834

o A8.6.195 STR (register) -- Encoding T1
o A8.6.193 STR (immediate, Thumb) -- Encoding T1

It has been changed so that now they use different addressing modes
and thus different MC representation (Operand Infos).  Modify the
disassembler to reflect the change, and add relevant tests.

llvm-svn: 127833

llvm-svn: 127832

Fix a problem where we were looking up the class pointer in the {class/sel -> implementation} cache for a objc_msgSendSuper call - where we should have looked up the class's super-class.

llvm-svn: 127830

BuildUDIV: If the divisor is even we can simplify the fixup of the multiplied value by introducing an early shift.

This allows us to compile "unsigned foo(unsigned x) { return x/28; }" into
	shrl	$2, %edi
	imulq	$613566757, %rdi, %rax
	shrq	$32, %rax
	ret

instead of
	movl    %edi, %eax
	imulq   $613566757, %rax, %rcx
	shrq    $32, %rcx
	subl    %ecx, %eax
	shrl    %eax
	addl    %ecx, %eax
	shrl    $4, %eax

on x86_64

llvm-svn: 127829

Add an argument to APInt's magic udiv calculation to specify the number of bits that are known zero in the divided number.

This will come in handy soon.

llvm-svn: 127828