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

llvm-svn: 137041

with an opaque struct type, it doesn't make sense.  This should
resolve PR10473.

llvm-svn: 137028

llvm-svn: 137023

recurrence, the initial values low bits can sometimes be ignored.

To take advantage of this, added FoldIVUser to IndVarSimplify to fold
an IV operand into a udiv/lshr if the operator doesn't affect the
result.

-indvars -disable-iv-rewrite now transforms

i = phi i4
i1 = i0 + 1
idx = i1 >> (2 or more)
i4 = i + 4

into

i = phi i4
idx = i0 >> ...
i4 = i + 4

llvm-svn: 137013

All new local ranges are marked as RS_New now, so there is no need to
attempt splitting of RS_Spill ranges any more.

llvm-svn: 137002

The local ranges created get to stay in the RS_New stage, just like for
local and region splitting.

This gives tryLocalSplit a bit more freedom the first time it sees one
of these new local ranges.

llvm-svn: 137001

llvm-svn: 136996

No functional change.

llvm-svn: 136994

These functions are no longer used, and they are easily replaced with a
loop calling shouldSplitSingleBlock and splitSingleBlock.

llvm-svn: 136993

Drop the use of SplitAnalysis::getMultiUseBlocks, there is no need to go
through a SmallPtrSet any more.

llvm-svn: 136992

Normally, we don't create a live range for a single instruction in a
basic block, the spiller does that anyway. However, when splitting a
live range that belongs to a proper register sub-class, inserting these
extra COPY instructions completely remove the constraints from the
remainder interval, and it may be allocated from the larger super-class.

The spiller will mop up these small live ranges if we end up spilling
anyway. It calls them snippets.

llvm-svn: 136989

Parsing and encoding for shifted index operands for load instructions.

llvm-svn: 136986

More parsing support for indexed loads. Fix pre-indexed with writeback
parsing for register offsets and handle basic post-indexed offsets.

llvm-svn: 136982

Some instructions require restricted register classes, but most of the
time that doesn't affect register allocation. For example, some
instructions don't work with the stack pointer, but that is a reserved
register anyway.

Sometimes it matters, GR32_ABCD only has 4 allocatable registers. For
such a proper sub-class, the register allocator should try to enable
register class inflation since that makes more registers available for
allocation.

Make sure only legal super-classes are considered. For example, tGPR is
not a proper sub-class in Thumb mode, but in ARM mode it is.

llvm-svn: 136981

Refactor STR[B] pre and post indexed instructions to use addressing modes for
memory operands, which is necessary for assembly parsing and is more consistent
with the rest of the memory instruction definitions. Make some incremental
progress on refactoring away the mega-operand addrmode2 along the way, which
is nice.

llvm-svn: 136978

The old code would look at kills and defs in one pass over the
instruction operands, causing problems with this code:

  %R0<def>, %CPSR<def,dead> = tLSLri %R5<kill>, 2, pred:14, pred:%noreg
  %R0<def>, %CPSR<def,dead> = tADDrr %R4<kill>, %R0<kill>, pred:14, %pred:%noreg

The last instruction kills and redefines %R0, so it is still live after
the instruction.

This caused a register scavenger crash when compiling 483.xalancbmk for
armv6. I am not including a test case because it requires too much bad
luck to expose this old bug.

First you need to convince the register allocator to use %R0 twice on
the tADDrr instruction, then you have to convince BranchFolding to do
something that causes it to run the register scavenger on he bad block.

<rdar://problem/9898200>

llvm-svn: 136973

The immediate portion of the operand is just a boolean (the 'U' bit indicating
add vs. subtract). Treat it as such.

llvm-svn: 136969

llvm-svn: 136968

<rdar://problem/9878189>

llvm-svn: 136962

llvm-svn: 136956

llvm-svn: 136954

inlined variable, based on the discussion in PR10542.

This explodes the runtime of several passes down the pipeline due to
a large number of "copies" remaining live across a large function. This
only shows up with both debug and opt, but when it does it creates
a many-minute compile when self-hosting LLVM+Clang. There are several
other cases that show these types of regressions.

All of this is tracked in PR10542, and progress is being made on fixing
the issue. Once its addressed, the re-instated, but until then this
restores the performance for self-hosting and other opt+debug builds.

Devang, let me know if this causes any trouble, or impedes fixing it in
any way, and thanks for working on this!

llvm-svn: 136953

llvm-svn: 136942

Enhance support for LDR instruction assembly parsing for post-indexed
addressing with immediate values. Add tests.

llvm-svn: 136940

Patch by Ivan Krasin!

llvm-svn: 136921

llvm-svn: 136916

llvm-svn: 136915

We need to map DebugLoc. It leads to Fuction * (through subprogram entry node) which should be appropriately mapped.

llvm-svn: 136910

llvm-svn: 136909

llvm-svn: 136908

This is meant to be overriden by backends. Implement an override on PowerPC
which adjusts the offset by 2 for ha16/lo16 relocation kinds. This removes
a commented out hack and enables hello world to be compiled on PowerPC.

llvm-svn: 136905

llvm-svn: 136901

llvm-svn: 136900

llvm-svn: 136899

LDCL_POST and STCL_POST need one's-complement offsets, rather than two's complement offsets.  Add an appropriate immediate type for them.

llvm-svn: 136896

the PVS-studio tool.

llvm-svn: 136878

llvm-svn: 136868

reported at http://habrahabr.ru/blogs/compilers/125626/.

llvm-svn: 136865

llvm-svn: 136857