closure after allocating all blocks.

Add a few more test cases for -regalloc=fast.

llvm-svn: 103500

to LLVM_LIBRARY_VISIBILITY and introduce LLVM_GLOBAL_VISIBILITY, which is
the opposite, for future use by dragonegg.

llvm-svn: 103495

llvm-svn: 103489

Sorry for the big change. The path leading up to this patch had some TableGen
changes that I didn't want to commit before I knew they were useful. They
weren't, and this version does not need them.

The fast register allocator now does no liveness calculations. Instead it relies
on kill flags provided by isel. (Currently those kill flags are also ignored due
to isel bugs). The allocation algorithm is supposed to work with any subset of
valid kill flags. More kill flags simply means fewer spills inserted.

Registers are allocated from a working set that contains no aliases. That means
most allocations can be done directly without expensive alias checks. When the
working set runs out of registers we do the full alias check to find new free
registers.

llvm-svn: 103488

Move EmitTargetCodeForMemcpy, EmitTargetCodeForMemset, and
EmitTargetCodeForMemmove out of TargetLowering and into
SelectionDAGInfo to exercise this.

llvm-svn: 103481

llvm-svn: 103457

llvm-svn: 103450

llvm-svn: 103449

llvm-svn: 103441

This means now 'llvm-ld a.bc b.bc' will preserve debug info appropriately.

llvm-svn: 103439

llvm-svn: 103436

llvm-svn: 103435

Be careful with operand promotion. For a binary operation, the source operands may be the same. PR7018. rdar://7939869.

llvm-svn: 103419

llvm-svn: 103410

SSAUpdater for the value from the first def may see uses of undefined values,
because the later defs will not have been updated yet.

llvm-svn: 103407

Based on a patch by Javier Martinez.

llvm-svn: 103391

llvm-svn: 103327

llvm-svn: 103325

and not the real problem itself, by dropping debug info for i128 values.
rdar://7958162.

llvm-svn: 103310

llvm-svn: 103305

llvm-svn: 103304

llvm-svn: 103303

getConstantFP to accept the two supported long double
target types.  This was not the original intent, but
there are other places that assume this works and it's
easy enough to do.

llvm-svn: 103299

llvm-svn: 103295

llvm-svn: 103272

patch by Peter Housel!

llvm-svn: 103267

llvm-svn: 103233

lowered copies.

llvm-svn: 103228

llvm-svn: 103227

increase in the debug line info section, and it's causing
regressions in a gdb testsuite.

llvm-svn: 103226

doesn't have to guess.

llvm-svn: 103194

llvm-svn: 103193

llvm-svn: 103185

with the fix in 103157.

%reg1039:1<def> = VMOVS %S1<kill>, pred:14, pred:%reg0
is not coalescable since none of the super-registers of S1 are in reg1039's
register class: DPR_VFP2. But it is still a legal copy instruction so it should
not assert.

llvm-svn: 103170

llvm-svn: 103145

Users can write broken code that emits the same label twice with asm renaming,
detect this and emit a fatal backend error instead of aborting.

llvm-svn: 103140

llvm-svn: 103139

support a new bottom-up mode.

llvm-svn: 103138

of just letting them inherit the debug locations of adjacent instructions.

Debug info should aim to be either accurate or absent.

llvm-svn: 103135

llvm-svn: 103133