Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164767

llvm-svn: 164768

llvm-svn: 164767

LLVM_ATTRIBUTE_USED forces emission of a function. To silence unused function warnings use LLVM_ATTRIBUTE_UNUSED.

llvm-svn: 164036

"#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)"

No functional change. Update r163339.

llvm-svn: 163653

No functional change.

llvm-svn: 163339

llvm-svn: 161122

llvm-svn: 157885

llvm-svn: 153502

llvm-svn: 153500

Reorder includes in Target backends to following coding standards. Remove some superfluous forward declarations.

llvm-svn: 152997

llvm-svn: 152391

Target/X86: Fix assertion failures and warnings caused by r151382 _ftol2 lowering for i386-*-win32 targets. Patch by Joe Groff.

[Joe Groff] Hi everyone. My previous patch applied as r151382 had a few problems:
Clang raised a warning, and X86 LowerOperation would assert out for
fptoui f64 to i32 because it improperly lowered to an illegal
BUILD_PAIR. Here's a patch that addresses these issues. Let me know if
any other changes are necessary. Thanks.

llvm-svn: 151432

used by the Win32 _ftol2 runtime function. Patch by Joe Groff!

llvm-svn: 151382

when building with assertions disabled.

llvm-svn: 137460

X86FloatingPoint keeps track of pending ST registers for an upcoming
inline asm instruction with fixed stack register constraints.  It does
this by remembering which FP register holds the value that should appear
at a fixed stack position for the inline asm.

When that FP register is killed before the inline asm, make sure to
duplicate it to a scratch register, so the ST register still has a live
FP reference.

This could happen when the same FP register was copied to two ST
registers, or when a spill instruction is inserted between the ST copy
and the inline asm.

This fixes PR10602.

llvm-svn: 137050

This fixes PR10575.

llvm-svn: 136787

llvm-svn: 134311

Add a MI->emitError() method that the backend can use to report errors
related to inline assembly. Call it from X86FloatingPoint.cpp when the
constraints are wrong.

This enables proper clang diagnostics from the backend:

$ clang -c pr30848.c
pr30848.c:5:12: error: Inline asm output regs must be last on the x87 stack
  __asm__ ("" : "=u" (d));  /* { dg-error "output regs" } */
           ^
1 error generated.

llvm-svn: 134307

llvm-svn: 134193

Drop the FpMov instructions, use plain COPY instead.

Drop the FpSET/GET instruction for accessing fixed stack positions.
Instead use normal COPY to/from ST registers around inline assembly, and
provide a single new FpPOP_RETVAL instruction that can access the return
value(s) from a call. This is still necessary since you cannot tell from
the CALL instruction alone if it returns anything on the FP stack. Teach
fast isel to use this.

This provides a much more robust way of handling fixed stack registers -
we can tolerate arbitrary FP stack instructions inserted around calls
and inline assembly. Live range splitting could sometimes break x87 code
by inserting spill code in unfortunate places.

As a bonus we handle floating point inline assembly correctly now.

llvm-svn: 134018

This allows for more live scratch registers which is needed to handle
live ST registers before return and inline asm instructions.

llvm-svn: 133903

Luis Felipe Strano Moraes!

llvm-svn: 129558

bundles in the pass.

llvm-svn: 122833

The analysis will be needed by both the greedy register allocator and the
X86FloatingPoint pass. It only needs to be computed once when the CFG doesn't
change.

This pass is very fast, usually showing up as 0.0% wall time.

llvm-svn: 122832

until other LLVM projects using these are cleaned up.

llvm-svn: 117200

(gcc-4.6 warns about these).

llvm-svn: 117021

Turn some fp stackifier assertion into errors to avoid silently generating bad code when assertions are off. rdar://8540457.

llvm-svn: 116368

llvm-svn: 111383

clang says is unused.

llvm-svn: 111167

llvm-svn: 111155

llvm-svn: 110460

llvm-svn: 110410

ID member as the sole unique type identifier.  Clean up APIs related to this change.

llvm-svn: 110396

llvm-svn: 108625

The isLive() method can read uninitialized memory, but it still gives correct
results.

llvm-svn: 108561

llvm-svn: 108535

FP_REG_KILL instructions are still inserted, but can be disabled by passing
-live-x87 to llc. The X87FPRegKillInserterPass is going to be removed shortly.

CFG edges are partioned into bundles where the x87 stack must be allocated
identically. Code is insertad at the end of each basic block that shuffles the
live FP registers to match the outgoing bundles expectations.

This fix is in preparation for some upcoming register allocator improvements
that may extend the live range of registers beyond a basic block, similar to
LICM. It also provides a nice runtime speedup if you are building with
-mfpmath=387.

llvm-svn: 108529

Based on a patch by Rafael Espíndola.

Attempt to make the FpSET_ST1 hack more robust, but we are still relying on
FpSET_ST0 preceeding it. This is only for supporting really weird x87 inline
asm.

We support:

  FpSET_ST0
  INLINEASM

  FpSET_ST0
  FpSET_ST1
  INLINEASM

with and without kills on the arguments. We don't support:

  FpSET_ST1
  FpSET_ST0
  INLINEASM

nor

  FpSET_ST1
  INLINEASM

Just Don't Do It!

llvm-svn: 108047

X86 memory operand.

llvm-svn: 107925

This pass runs before COPY instructions are passed to copyPhysReg, so we simply
translate COPY to the proper pseudo instruction. Note that copyPhysReg does not
handle floating point stack copies.

Once COPY is used everywhere, this can be cleaned up a bit, and most of the
pseudo instructions can be removed.

llvm-svn: 107899