llvm-svn: 77598

llvm-svn: 77584

Optimize some common usage patterns of atomic built-ins __sync_add_and_fetch() and __sync_sub_and_fetch. 

When the return value is not used (i.e. only care about the value in the memory), x86 does not have to use add to implement these. Instead, it can use add, sub, inc, dec instructions with the "lock" prefix.

This is currently implemented using a bit of instruction selection trick. The issue is the target independent pattern produces one output and a chain and we want to map it into one that just output a chain. The current trick is to select it into a merge_values with the first definition being an implicit_def. The proper solution is to add new ISD opcodes for the no-output variant. DAG combiner can then transform the node before it gets to target node selection.

Problem #2 is we are adding a whole bunch of x86 atomic instructions when in fact these instructions are identical to the non-lock versions. We need a way to add target specific information to target nodes and have this information carried over to machine instructions. Asm printer (or JIT) can use this information to add the "lock" prefix.

llvm-svn: 77582

a Twine, e.g., for names).
 - I am a little ambivalent about this; we don't want the string conversion of
   utostr, but using overload '+' mixed with string and integer arguments is
   sketchy. On the other hand, this particular usage is something of an idiom.

llvm-svn: 77579

declaration for them.

llvm-svn: 77578

due to x86 encoding restrictions. This is currently off by default
because it may cause code quality regressions. This is for PR4572.

llvm-svn: 77565

llvm-svn: 77558

llvm-svn: 77557

llvm-svn: 77553

llvm-svn: 77522

llvm-svn: 77521

llvm-svn: 77516

now that TargetOperandInfo does the heavy lifting.

llvm-svn: 77508

llvm-svn: 77507

   and convert code to using it, instead of having lots of things
   poke the isLookupPtrRegClass() method directly.

2. Make PointerLikeRegClass contain a 'kind' int, and store it in
   the existing regclass field of TargetOperandInfo when the
   isLookupPtrRegClass() predicate is set.  Make getRegClass pass
   this into TargetRegisterInfo::getPointerRegClass(), allowing
   targets to have multiple ptr_rc things.

llvm-svn: 77504

support multiple different pointer register classes.

llvm-svn: 77501

- Darwin Thumb2 call clobbers r9.

llvm-svn: 77500

llvm-svn: 77480

wide vectors.  Likewise, change VSTn intrinsics to take separate arguments
for each vector in a multi-vector struct.  Adjust tests accordingly.

llvm-svn: 77468

llvm-svn: 77442

llvm-svn: 77441

llvm-svn: 77438

llvm-svn: 77435

llvm-svn: 77434

No functionality change.

llvm-svn: 77432

llvm-svn: 77430

remove some completely wrong code.  1 is never < 16.  It turns out that GCC appears to put strings of any length into the ELF cstring equivalent, so just rip out the code.

llvm-svn: 77429

llvm-svn: 77422

llvm-svn: 77415

Leopard.

llvm-svn: 77414

to ptest instruction plus setcc. Revamp ptest instruction. Add test.

llvm-svn: 77407

llvm-svn: 77404

Thumb-2: fix typo that caused incorrect stack elimination for VFP operations and very large stack frames.

llvm-svn: 77401

llvm-svn: 77384

llvm-svn: 77376

dealing with Data.

llvm-svn: 77372

New name is Metadata.h.

llvm-svn: 77370

llvm-svn: 77366

In thumb2 mode, add pc is unpredictable. Use add + mov pc instead (that is until more optimization goes in).

llvm-svn: 77364

llvm-svn: 77363