GCC would put weak zero initialized mutable data in the .bss section,
we would put it into a crasy '.gnu.linkonce.b.test,"aw",@nobits' 
section.  Fixing this will allow simplifications next up.

llvm-svn: 93844

simplify and commonize some of the asmprinter logic for globals.

This also avoids printing the MCSection for .zerofill, which broke
the llvm-gcc build.

llvm-svn: 93843

llvm-svn: 93842

llvm-svn: 93841

llvm-svn: 93839

1. TargetLoweringObjectFileMachO should decide if something
   goes in zerofill instead of having every target do it.
2. TargetLoweringObjectFileMachO should assign said symbols to
   the right MCSection, the asmprinters should just emit to the
   right section.
3. Since all zerofill stuff goes through mcstreamer anymore,
   MAI can have a bool "haszerofill" instead of having the textual
   directive to emit.

llvm-svn: 93838

llvm-svn: 93835

llvm-svn: 93833

llvm-svn: 93832

llvm-svn: 93831

Fix r93758. Use isel patterns instead of c++ selection code to select rbit and make sure we pick different instructions for ARM vs. Thumb2.

llvm-svn: 93829

llvm-svn: 93824

llvm-svn: 93819

llvm-svn: 93818

comments (fast isel, X86).  This doesn't seem
to break any functionality, but will introduce
cases where -g affects the generated code.  I'll
be fixing that.

llvm-svn: 93811

Add comment that MDNode::getFunction() is not to be used by performance-critical code (currently only used by AsmWriter)

llvm-svn: 93802

match.

llvm-svn: 93798

llvm-svn: 93797

- Greatly improve the comments to the getLSDAEncoding method.

llvm-svn: 93796

patch by Michael Beck!

llvm-svn: 93793

aggressive changed the canonical form from sext(trunc(x)) to ashr(lshr(x)),
make sure to transform a couple more things into that canonical form,
and catch a case where we missed turning zext/shl/ashr into a single sext.

llvm-svn: 93787

llvm-svn: 93784

to something more accurate.

llvm-svn: 93782

llvm-svn: 93781

be used independently of SourceMgr.

llvm-svn: 93780

printing via <<. Otherwise we just print the pointer value.

llvm-svn: 93777

llvm-svn: 93776

llvm-svn: 93775

llvm-svn: 93774

Instcombine does this but apparently there are situations where this pattern will escape the optimizer and / or created by isel. Here is a case that's seen in JavaScriptCore:
  %t1 = sub i32 0, %a
  %t2 = add i32 %t1, -1
The dag combiner pattern: ((c1-A)+c2) -> (c1+c2)-A
will fold it to -1 - %a.

llvm-svn: 93773

llvm-svn: 93771

llvm-svn: 93764

Simplify MDNode::getFunction() and assertLocalFunction() by avoiding extra Function* variable and smallptrset since function-local metadata cannot be cyclic

llvm-svn: 93762

the various MOV (register) instructions (16-bit Thumb), including tBRIND (the
indirect branch).  Instead of '1', it should be specified as '?', because GPR
only specifies the register class, which includes both hi-and-lo registers.

llvm-svn: 93759

"On ARMv6T2 this turns cttz into rbit, clz instead of the 4 instruction
 sequence it is now."

llvm-svn: 93758

because it points to an alloca instruction through metadata.

llvm-svn: 93757

.ll parser, but PR6070 wants it in the verifier too.

llvm-svn: 93756

llvm-svn: 93755

  idea, but unfortunately necessary.
- Default to using 4-bytes for the LSDA pointer encoding to agree with the
  encoded value in the CIE.

llvm-svn: 93753

Make printing of metadata more robust when function is not found (which is the normal situation for non function-local metadata)

llvm-svn: 93748