implementation for x86.

llvm-svn: 37576

llvm-svn: 37575

turned on.  Likewise for scanning of invokes to mark landing pads.

llvm-svn: 37570

VCONCAT_VECTORS. Use these for CopyToReg and CopyFromReg legalizing in
the case that the full register is to be split into subvectors instead
of scalars. This replaces uses of VBIT_CONVERT to present values as
vector-of-vector types in order to make whole subvectors accessible via
BUILD_VECTOR and EXTRACT_VECTOR_ELT.

This is in preparation for adding extended ValueType values, where
having vector-of-vector types is undesirable.

llvm-svn: 37569

correct types for the result vector, even though it is currently bitcasted
to a different type immediately.

llvm-svn: 37568

crashing but breaks exception handling.  The problem
described in PR1224 is that invoke is a terminator that
can produce a value.  The value may be needed in other
blocks.  The code that writes to registers values needed
in other blocks runs before terminators are lowered (in
this case invoke) so asserted because the value was not
yet available.  The fix that was applied was to do invoke
lowering earlier, before writing values to registers.

The problem this causes is that the code to copy values
to registers can be output after the invoke call.  If
an exception is raised and control is passed to the
landing pad then this copy-code will never execute.  If
the value is needed in some code path reached via the
landing pad then that code will get something bogus.

So revert the original fix and simply skip invoke values
in the general copying to registers code.  Instead copy
the invoke value to a register in the invoke lowering code.

llvm-svn: 37567

llvm-svn: 37566

llvm-svn: 37565

llvm-svn: 37544

llvm-svn: 37543

llvm-svn: 37537

llvm-svn: 37531

llvm-svn: 37529

llvm-svn: 37524

llvm-svn: 37523

simultaneously.  Move that pass to SimpleRegisterCoalescing.

This makes it easier to implement alternative register allocation and
coalescing strategies while maintaining reuse of the existing live
interval analysis.

llvm-svn: 37520

llvm-svn: 37518

how much will be used.

llvm-svn: 37515

llvm-svn: 37511

is too slow.

llvm-svn: 37509

llvm-svn: 37503

llvm-svn: 37496

ifcvt a triangle: don't merge ifcvt block with rejoin block if it can fall through to it. If merged, the resulting block is not a candidate for iterative ifcvting since it contains both predicated and non-predicated code.

llvm-svn: 37487

llvm-svn: 37485

Evan, please check that this is in fact correct.

llvm-svn: 37471

same, only output one copy of the common part.

llvm-svn: 37470

llvm-svn: 37467

correct machine basic block - do not rely on the eh.exception intrinsic
being in the landing pad: the loop optimizers can move it out.

llvm-svn: 37463

If a unconditional branch is added to branch to the false path during ifcvt, the predicated block cannot be iteratively ifcvted.

llvm-svn: 37456

llvm-svn: 37451

llvm-svn: 37449

llvm-svn: 37444

llvm-svn: 37441

llvm-svn: 37440

llvm-svn: 37433

If the predicated block requires an early exit, end the block there and add a unconditional branch to false block. AnalyzeBranch() does not understand early exits.

llvm-svn: 37430

llvm-svn: 37429

llvm-svn: 37427

llvm-svn: 37421

llvm-svn: 37420