Added optimization that narrow load / op / store and the 'op' is a bit twiddling instruction and its second operand is an immediate. If bits that are touched by 'op' can be done with a narrower instruction, reduce the width of the load and store as well. This happens a lot with bitfield manipulation code.
e.g.
orl     $65536, 8(%rax)
=>
orb     $1, 10(%rax)

Since narrowing is not always a win, e.g. i32 -> i16 is a loss on x86, dag combiner consults with the target before performing the optimization.

llvm-svn: 72507

llvm-svn: 72494

llvm-svn: 72488

llvm-svn: 72483

FP_TO_XINT.  Necessary for some cleanups I'm working on.  Updated 
from the previous version (r72431) to fix a bug and make some things a 
bit clearer.

llvm-svn: 72445

llvm-svn: 72436

- added processors k8-sse3, opteron-sse3, athlon64-sse3, amdfam10, and
barcelona with appropriate sse3/4a levels
- added FeatureSSE4A for amdfam10 processors
in X86Subtarget:
- added hasSSE4A
- updated AutoDetectSubtargetFeatures to detect SSE4A
- updated GetCurrentX86CPU to detect family 15 with sse3 as k8-sse3 and
family 10h as amdfam10

New processor names match those used by gcc.

Patch by Paul Redmond!

llvm-svn: 72434

FP_TO_XINT.  Necessary for some cleanups I'm working on. 

llvm-svn: 72431

even on Core2, not just AMD processors which was a surprise to me.

llvm-svn: 72396

llvm-svn: 72395

llvm-svn: 72387

nodes it generates.

llvm-svn: 72356

moment.

llvm-svn: 72350

llvm-svn: 72337

llvm-svn: 72336

llvm-svn: 72335

systems instead of attempting to promote them to a 64-bit SINT_TO_FP or 
FP_TO_SINT.  This is in preparation for removing the type legalization 
code from LegalizeDAG: once type legalization is gone from LegalizeDAG, 
it won't be able to handle the i64 operand/result correctly.

This isn't quite ideal, but I don't think any other operation for any 
target ends up in this situation, so treating this case specially seems 
reasonable.

llvm-svn: 72324

files for PIC16 target.

llvm-svn: 72277

for ARM.  This fixes rdar://6908807.

llvm-svn: 72269

Emit debug information for globals (which include automatic variables as well because on PIC16 they are emitted as globals by the frontend).

llvm-svn: 72262

llvm-svn: 72172

llvm-svn: 72160

llvm-svn: 72154

llvm-svn: 72138

This fixes pr4233.

llvm-svn: 72115

the stack.  Patch by Sandeep Patel.

llvm-svn: 72106

llvm-svn: 72105

llvm-svn: 72083

llvm-svn: 72045

to run last because it needs to know the exact size and position of every
basic block.  Currently CodePlacementOpt is set up to run last.  It might be
worthwhile to investigate reordering these passes, but for now, let's just
make it work.

llvm-svn: 72037

Some comment cleanup.

llvm-svn: 72022

llvm-svn: 71976

llvm-svn: 71975

llvm-svn: 71935

llvm-svn: 71934

llvm-svn: 71813

llvm-svn: 71812

llvm.eh.sjlj.* for better clarity as to their purpose and scope. Add
a description of llvm.eh.sjlj.setjmp to ExceptionHandling.html.
(llvm.eh.sjlj.longjmp documentation coming when that implementation is
added).

llvm-svn: 71758

llvm-svn: 71735

llvm-svn: 71726