LowerSubregs, and fix an x86-64 isel bug that this exposed.

SUBREG_TO_REG for x86-64 implicit zero extension is only safe for
isel to generate when the source is known to always have zeros in
the high 32 bits. The EXTRACT_SUBREG instruction does not clear
the high 32 bits.

llvm-svn: 54444

llvm-svn: 54443

are allocated in the same buffer as the code,
jump tables, etc.

The default JIT memory manager does not handle buffer
overflow well.  I didn't introduce this and I'm not
attempting to fix it here, but it is more likely to
be hit now since we're putting more stuff in the
buffer.  This affects one test that I know of so far,
MultiSource/Benchmarks/NPB-serial/is.

llvm-svn: 54442

llvm-svn: 54440

Unify logic in return-of-stack-check (Sema) for casts and implicit casts.

llvm-svn: 54439

Factor code that finalize PHI nodes, jump tables, etc. out of SelectBasicBlock. No functionality changes.

llvm-svn: 54438

llvm-svn: 54437

llvm-svn: 54436

Cleanup some processing with DeclStmt, and gradually start using the internal BumpPtrAllocator to allocator more of CFG's data structures.

llvm-svn: 54433

SDISel's constant branch folding can fold away self-loops, which doesn't result in any dead blocks, but
rather an incorrect phi input.  Add code to UnreachableMachineBlockElim to get rid of these entries.

llvm-svn: 54432

llvm-svn: 54431

llvm-svn: 54429

llvm-svn: 54428

Correct handle cases where two phis are coalesced together, and correct break up the case where two different
phis want to coalesce with the same vreg.

llvm-svn: 54426

llvm-svn: 54425

llvm-svn: 54424

llvm-svn: 54423

llvm-svn: 54422

llvm-svn: 54421

llvm-svn: 54420

this time using MOV32to32_ and MOV16to16_. Thanks to Evan for
suggesting this.

llvm-svn: 54418

when it meant to be emitting undef indices.

llvm-svn: 54417

llvm-svn: 54416

Fix PR2355: bug in ChangeCompareStride. When the loop termination compare is the only use of its iv stride, the stride can be eliminated by moving it to another stride. If the scale is negative, swap the predicate instead of using a inverse predicate.

llvm-svn: 54415

llvm-svn: 54414

 - Change hardcoded assembly instructions to a use of 'opt' (still
   waiting for someone to yell at me for this).

 - Add some cases to cover behavior fixed by previous commit.

llvm-svn: 54413

While this is a safe rewriter fix, there is still a need for some discussion (see report for more info).

llvm-svn: 54412

llvm-svn: 54411

When serializing DeclStmt, encode a bit indicating whether or not the DeclStmt owns the Decl.  This is an interim solution.

llvm-svn: 54410

llvm-svn: 54409

llvm-svn: 54408

Added fp register clobbering during calls.
Added AsmPrinter support for "fmask", a bitmask that indicates where on the 
stack the fp callee saved registers are.

Fixed the stack frame layout for Mips, now the callee saved regs 
are in the right stack location (a little documentation about how this
stack frame must look like is present in MipsRegisterInfo.cpp).
This was done using the method MipsRegisterInfo::adjustMipsStackFrame
To be more clear, these are examples of what is solves :  

1) FP and RA are also callee saved, and despite they aren't in CSI they 
   must be saved before the fp callee saved registers. 
2) The ABI requires that local varibles are allocated before the callee 
   saved register area, the opposite behavior from the default allocation.
3) CPU and FPU saved register area must be aligned independent of each
   other.

llvm-svn: 54403

llvm-svn: 54400

llvm-svn: 54398

 - PR2643

llvm-svn: 54397

matters, the result is undefined anyway.

llvm-svn: 54396

type.

 - This generates somewhat less optimal code than before but this is
   not hard to rectify once stable (at the cost of slightly more
   complex code).

 - This currently always uses little-endian ordering of the bitfield. 

 - This breaks the CodeGen/bitfield.c test because it was grepping for
   hard-coded assembly instructions. Will fix once a better test case
   is constructed (hard to do without execution).

 - This fixes SingleSource/UnitTests/2006-01-23-InitializedBitField.c
   and Regression/C/PR1386.c from the test suite.

 - <rdar://problem/6085090>, <rdar://problem/6094169>

llvm-svn: 54395

tracking down that this was breaking llvm-gcc bootstrap on Linux.

llvm-svn: 54394

llvm-svn: 54393

 - Changed EmitSub to work on all cases (arithmetic, ptr - int, ptr -
   ptr) so that implementation matches that of other operators.

 - Modify EmitCompoundAssign to compute and perform the appropriate
   casts of left, right, and result types for the assorted pointer
   arithmetic cases.

 - Fix EmitSub (ptr - int) case to negate the rhs *after*
   extension. This is critical when the rhs is unsigned (and needs
   extension).

 - This fixes cfrac.

 - <rdr://6115726>

llvm-svn: 54392