llvm-svn: 185395

Patch by Benjamin Kramer!

Use the BlockFrequency class instead of floats in the Hopfield network
computations. This rescales the node Bias field from a [-2;2] float
range to two block frequencies BiasN and BiasP pulling in opposite
directions. This construct has a more predictable behavior when block
frequencies saturate.

The per-node scaling factors are no longer necessary, assuming the block
frequencies around a bundle are consistent.

This patch can cause the register allocator to make different spilling
decisions. The differences should be small.

llvm-svn: 185393

Restrict the current TLS support to X86 ELF for now. Test that we don't
produce it on PPC & we can flesh that test case out with the right thing
once someone implements it.

llvm-svn: 185389

llvm-svn: 185378

llvm-svn: 185367

When phis get lowered, destination copies are inserted using an iterator that is
determined once for all phis in the block, which BuildMI interprets as a request
to insert an instruction directly before the iterator. In the case of a cyclic
phi, source copies may also be inserted directly before this iterator, which can
cause source copies to be inserted before destination copies. The fix is to keep
an iterator to the last phi and then advance it while lowering each phi in order
to insert destination copies directly after the phis.

llvm-svn: 185363

Added c++ mode selector to head of SelectionDAGBuilder.h so editors open it in c++ mode instead of c mode.

llvm-svn: 185348

llvm-svn: 185266

Based on GCC's output for TLS variables (OP_constNu, x@dtpoff,
OP_lo_user), this implements debug info support for TLS in ELF. Verified
that this output is correct/sufficient on Linux (using gold - if you're
using binutils-ld, you'll need something with the fix for
http://sourceware.org/bugzilla/show_bug.cgi?id=15685 in it).

Support on non-ELF is sort of "arbitrary" at the moment - if Apple folks
want to discuss (or just go ahead & implement) how this should work in
MachO, etc, I'm open.

llvm-svn: 185203

This is a precursor to adding debug info support for TLS which requires
non-default relocations applied to TLS symbols.

llvm-svn: 185202

llvm-svn: 185190

llvm-svn: 185189

llvm-svn: 185188

should expand ATOMIC_CMP_SWAP nodes the same way that it does for ATOMIC_SWAP.

Since ATOMIC_LOADs on some targets (e.g. older ARM variants) get legalized to
ATOMIC_CMP_SWAPs, the missing case had been causing i64 atomic loads to crash
during isel.

<rdar://problem/14074644>

llvm-svn: 185186

No functionality change.
It should suffice to check the type of a debug info metadata, instead of
calling Verify. For cases where we know the type of a DI metadata, use
assert.

Also update testing cases to make them conform to the format of DI classes.

llvm-svn: 185135

llvm-svn: 185072

llvm-svn: 184933

Optimized integer vector multiplication operation by replacing it with shift/xor/sub when it is possible. Fixed a bug in SDIV, where the const operand is not a splat constant vector.

llvm-svn: 184931

llvm-svn: 184866

This is a band-aid to fix the most severe regressions we're seeing from basing
spill decisions on block frequencies, until we have a better solution.

llvm-svn: 184835

llvm-svn: 184792

llvm-svn: 184788

never modified. No functional change.

llvm-svn: 184781

This makes it possible to write unit tests that are less susceptible
to minor code motion, particularly copy placement. block-placement.ll
covers this case with -pre-RA-sched=source which will soon be
default. One incorrectly named block is already fixed, but without
this fix, enabling new coalescing and scheduling would cause more
failures.

llvm-svn: 184680

llvm-svn: 184669

llvm-svn: 184643

llvm-svn: 184642

We have no targets on trunk that bundle before regalloc. However, we
have been advertising regalloc as bundle safe for use with out-of-tree
targets. We need to at least contain the parts of the code that are
still unsafe.

llvm-svn: 184620

A FastISel optimization was causing us to emit no information for such
parameters & when they go missing we end up emitting a different
function type. By avoiding that shortcut we not only get types correct
(very important) but also location information (handy) - even if it's
only live at the start of a function & may be clobbered later.

Reviewed/discussion by Evan Cheng & Dan Gohman.

llvm-svn: 184604

When (srl (anyextend x), c) is folded into (anyextend (srl x, c)), the
high bits are not cleared. Add 'and' to clear off them.

llvm-svn: 184575

llvm-svn: 184574

llvm-svn: 184573

Live intervals for dead physregs may be created during coalescing. We
need to update these in the event that their instruction goes away.

crash.ll is the unit test that catches it when MI sched is enabled on
X86.

llvm-svn: 184572

I want to add logic to handle more cases.

llvm-svn: 184571

llvm-svn: 184570

llvm-svn: 184569

Always coalesce in forward order to propagate rematerialization.
I'm fixing this option so I can enable it by default soon.

llvm-svn: 184568

llvm-svn: 184567

llvm-svn: 184565

llvm-svn: 184564