objects for big endian and little endian targets.

Patch by Jack Carter.

llvm-svn: 151788

Simply treat bundles as instructions. Spill code is inserted between
bundles, never inside a bundle.  Rewrite all operands in a bundle at
once.

Don't attempt and memory operand folding inside bundles.

llvm-svn: 151787

* Add begin_dynamic_table() / end_dynamic_table() private interface to ELFObjectFile.
* Add begin_libraries_needed() / end_libraries_needed() interface to ObjectFile, for grabbing the list of needed libraries for a shared object or dynamic executable.
* Implement this new interface completely for ELF, leave stubs for COFF and MachO.
* Add 'llvm-readobj' tool for dumping ObjectFile information.

llvm-svn: 151785

This allows the function to be inlined, and makes it suitable for use in
getInstructionIndex().

Also provide a const version. C++ is great for touch typing practice.

llvm-svn: 151782

Shrinks BasicAliasAnalysis.o from 106k to 56k on i386.

llvm-svn: 151781

While we're at it - don't copy vreg implicit operands while rematerializing.
This fixes PR12138.

llvm-svn: 151779

llvm-svn: 151778

code sections when needed.  It just had a conditional
the wrong way around.

llvm-svn: 151777

- The search bounds are constant, in the worst case (ARM target) it will scan over 30 uint16_ts.
- This method isn't very hot, I had problems finding a testcase where it's called more than a dozen of times (no perf impact).

llvm-svn: 151773

So with darwin's otool(1) an x86_64 hello world .o file will print:
leaq	L_.str(%rip), %rax ## literal pool for: Hello world

llvm-svn: 151769

llvm-svn: 151764

Doesn't help ARM with its massive register set, but halves the size on x86 and all other targets.

llvm-svn: 151760

llvm-svn: 151758

llvm-svn: 151756

llvm-svn: 151755

Instead of nested switch statements, use a lookup table. On ARM, this replaces
a 23k (x86_64 release build) function with a 16k table. Its not unlikely to
be faster, as well.

llvm-svn: 151751

std::vector.
 - Good for 1-2% speedup on writing PCH for Cocoa.h.
 - Clang side API match to follow shortly, there wasn't an easy way to make this
   non-breaking.

llvm-svn: 151750

llvm-svn: 151749

and remove getBuffer().

llvm-svn: 151748

llvm-svn: 151747

Patch by Tyler Nowicki!

llvm-svn: 151743

llvm-svn: 151732

LegalizeIntegerTypes: Reorder operations in the "big shift by small amount" optimization, making the lives of later passes easier.

llvm-svn: 151722

a constant.  This fixes PR1768.

llvm-svn: 151713

pin it down is undefined behaviour.

llvm-svn: 151710

[Object] Add symbol attribute flags: ST_ThreadLocal, ST_Common, and ST_Undefined. Implement these completely for ELF.
Rename ST_External to ST_Unknown, and slightly change its semantics. It now only indicates that the symbol's type
is unknown, not that the symbol is undefined. (For that, use ST_Undefined).

llvm-svn: 151696

llvm-svn: 151694

This transformation is not correct for not-equal conditions:

(trunc x) != C1 & (and x, CA) != C2 -> (and x, CA|CMAX) != C1|C2

Let
  C1 == 0
  C2 == 0
  CA == 0xFF0000
  CMAX == 0xFF
and truncating to i8.

The original truth table:

    x   | A: trunc x != 0 | B: x & 0xFF0000 != 0 | A & B != 0
--------------------------------------------------------------
0x00000 |        0        |          0           |     0
0x00001 |        1        |          0           |     0
0x10000 |        0        |          1           |     0
0x10001 |        1        |          1           |     1

The truth table of the replacement:

    x   | x & 0xFF00FF != 0
----------------------------
0x00000 |        0
0x00001 |        1
0x10000 |        1
0x10001 |        1

So they are different.

llvm-svn: 151691

This function does more or less the same as
MI::readsWritesVirtualRegister(), but it supports bundles as well.

It also determines if any constraint requires reading and writing
operands to use the same register.  Most clients want to know.

Use the more modern MO.readsReg() instead of trying to sort out undefs
and partial redefines.  Stop supporting the extra full <imp-def> operand
as an alternative to <def,undef> sub-register defines.

llvm-svn: 151690

llvm-svn: 151687

llvm-svn: 151685

Extract a base class and provide four specific sub-classes for iterating
over const/non-const bundles/instructions.

This eliminates the mystery bool constructor argument.

llvm-svn: 151684

find root names on Unix.
 - This fixes make_absolute to not basically always call current_path() on
   Unix systems.
 - I think the API probably needs cleanup in this area, but I'll let Michael
   handle that.

llvm-svn: 151681

llvm-svn: 151680

in the streaming case.

llvm-svn: 151676

llvm-svn: 151675

Without this hook, functions w/ a completely empty body (including no
epilogue) will cause an MCEmitter assertion failure.

For example,
define internal fastcc void @empty_function() {
  unreachable
}

rdar://10947471

llvm-svn: 151673

SlotIndexes are not assigned to instructions inside bundles, but it is
still valid to look up the index of those instructions.

The reverse getInstructionFromIndex() will return the first instruction
in the bundle.

llvm-svn: 151672

In the ObjectFile interface, replace isInternal(), isAbsolute(), isGlobal(), and isWeak(), with a bitset of flags.

llvm-svn: 151670

sure we don't use it with compilers that don't support it.

llvm-svn: 151665