llvm-svn: 131439

llvm-svn: 131438

When instructions are deleted, they leave tombstone SlotIndex entries.
The isZeroLength method should ignore these null indexes.

This causes RABasic to sometimes spill a callee-saved register in the
abi-isel.ll test, so don't run that test with -regalloc=basic.  Prioritizing
register allocation according to spill weight can cause more registers to be
used.

llvm-svn: 131436

llvm-svn: 131424

llvm-svn: 131420

Basic fast-isel of extractvalue.  Not too helpful on its own, given the IR clang generates for cases like this, but it should become more useful soon.

llvm-svn: 131417

llvm-svn: 131330

Re-enable branchfolding common code hoisting optimization. Fixed a liveness test bug and also taught it to update liveins.

llvm-svn: 131241

Identify end of prologue (and beginning of function body) using DW_LNS_set_prologue_end line table opcode.

llvm-svn: 131194

Fixes a bug in the DAGCombiner.  LoadSDNodes have two values (data, chain).
If there is a store after the load node, then there is a chain, which means
that there is another user. Thus, asking hasOneUser would fail. Instead we
ask hasNUsesOfValue on the 'data' value.

llvm-svn: 131183

Add custom lowering of X86 vector SRA/SRL/SHL when the shift amount is a splat vector.

llvm-svn: 131179

to provide a reduced testcase.

llvm-svn: 131176

at the start of basic blocks to their common predecessor. It's actually quite
common (e.g. about 50 times in JM/lencod) and has shown to be a nice code size
benefit. e.g.

        pushq   %rax
        testl   %edi, %edi
        jne     LBB0_2
## BB#1:
        xorb    %al, %al
        popq    %rdx
        ret
LBB0_2:
        xorb    %al, %al
        callq   _foo
        popq    %rdx
        ret

=>

        pushq   %rax
        xorb    %al, %al
        testl   %edi, %edi
        je      LBB0_2
## BB#1:
        callq   _foo
LBB0_2:
        popq    %rdx
        ret

rdar://9145558

llvm-svn: 131172

"b + ((a < b) ? 1 : 0)" compiles into
	cmpl	%esi, %edi
	adcl	$0, %esi
instead of
	cmpl	%esi, %edi
	sbbl	%eax, %eax
	andl	$1, %eax
	addl	%esi, %eax

This saves a register, a false dependency on %eax
(Intel's CPUs still don't ignore it) and it's shorter.

llvm-svn: 131070

This can't be just an assertion, users can always write impossible inline
assembly. Such an assembly statement should be included in the error message.

llvm-svn: 131024

possibly related to cbnz formation.

llvm-svn: 130977

I tested both gdb on a bootstrapped clang and and the gdb testsuite on OS X (snow leopard)
and both are happy using __eh_frame.

llvm-svn: 130937

Avoid extra vreg copies for arguments passed in registers.  Specifically, this can make MachineCSE more effective in some cases (especially in small functions).  PR8361 / part of rdar://problem/8259436 .

llvm-svn: 130928

llvm-svn: 130893

Most of these tests require a single mov instruction that can come either before
or after a 2-addr instruction. -join-physregs changes the behavior, but the
results are equivalent.

llvm-svn: 130891

Original message:

Teach MachineCSE how to do simple cross-block CSE involving physregs.  This allows, for example, eliminating duplicate cmpl's on x86. Part of rdar://problem/8259436 .

llvm-svn: 130877

llvm-svn: 130867

Teach MachineCSE how to do simple cross-block CSE involving physregs.  This allows, for example, eliminating duplicate cmpl's on x86. Part of rdar://problem/8259436 .

llvm-svn: 130862

llvm-svn: 130818

<rdar://problem/8460511>

llvm-svn: 130791

llvm-svn: 130658

-fno-dwarf2-cfi-asm. Implement the same behavior.

llvm-svn: 130637

less agressive about disabling cfi on linux :-(

llvm-svn: 130626

Currently the output should be almost identical to the one produced by CodeGen
to make the transition easier.

The only two differences I know of are:

* Some files get an extra advance loc of size 0. This will be fixed when
relaxations are enabled.
* The optimization of declaring an EH symbol as an external variable is not
implemented. This is a subset of adding the nounwind attribute, so we if really
this at -O0 we should probably do it at the IL level.

llvm-svn: 130623

llvm-svn: 130599

llvm-svn: 130567

emmits: .cfi_personality, .cfi_lsda and the moves.

llvm-svn: 130503

fast-isel sret calls, try 2.  We actually do need to do something on x86-32. rdar://problem/9303592 .

llvm-svn: 130429

llvm-svn: 130418

llvm-svn: 130412

This fixes clang generated blocks' variables' debug info.
Radar 9279956.

llvm-svn: 130373

llvm-svn: 130360

llvm-svn: 130348

Make the fast-isel code for literal 0.0 a bit shorter/faster, since 0.0 is common.  rdar://problem/9303592 .

llvm-svn: 130338

rdar://problem/9303306 .

llvm-svn: 130272