2. Coalescer can now create an interesting situation where a register def can
   reaches itself without being killed.

llvm-svn: 49246

before an invoke.  Failure to do this causes references in
the landing pad to variables that were not set.  Fixes
g++.dg/eh/delayslot1.C
g++.dg/eh/fp-regs.C
g++.old-deja/g++.brendan/eh1.C

llvm-svn: 49243

llvm-svn: 49198

llvm-svn: 49197

if some functions don't have debug info, we were outputing the same label at the start of each of those functions.  This makes assemblers unhappy

llvm-svn: 49176

- Be smarter about coalescing copies from implicit_def.

llvm-svn: 49168

llvm-svn: 49167

- Eliminate an implicit_def when it's being spilled.

llvm-svn: 49166

- Be (slightly) smarter about where to place the copies.

llvm-svn: 49165

There is no point in creating a long live range defined by an implicit_def. Scheduler now duplicates implicit_def instruction for each of its uses. Therefore, if an implicit_def node has multiple uses, it will become a number of very short live ranges, rather than a long one. This will make coalescer's job easier.

llvm-svn: 49164

llvm-svn: 49124

StripSymbols when EH is on.

llvm-svn: 49110

Now that I am told MachineRegisterInfo also tracks physical register uses / defs, I can do away with the horribleness I introduced a while back. It's impossible to detect if there is any use of a physical register below an instruction (and before any def of the register) with some cheap book keeping.

llvm-svn: 49105

llvm-svn: 49099

llvm-svn: 49096

node and its inputs.

llvm-svn: 49070

unknown defining inst after PHI elimination.

llvm-svn: 49069

review feedback.
-enable-eh is still accepted but doesn't do anything.
EH intrinsics use Dwarf EH if the target supports that,
and are handled by LowerInvoke otherwise.
The separation of the EH table and frame move data is,
I think, logically figured out, but either one still
causes full EH info to be generated (not sure how to
split the metadata correctly).
MachineModuleInfo::needsFrameInfo is no longer used and
is removed.

llvm-svn: 49064

llvm-svn: 49053

llvm-svn: 49046

llvm-svn: 49043

llvm-svn: 49016

llvm-svn: 49014

llvm-svn: 49013

llvm-svn: 49012

not marked nounwind, or for all functions when -enable-eh
is set, provided the target supports Dwarf EH.

llvm-gcc generates nounwind in the right places; other FEs
will need to do so also.  Given such a FE, -enable-eh should
no longer be needed.

llvm-svn: 49006

llvm-svn: 49002

llvm-svn: 48995

llvm-svn: 48994

The support for remat of instructions with a register operand is hackish, to say the least. Since the register operand guaranteed to be PIC base and that it is already live at all uses, we are making sure it will not be spilled after its uses are rematerialized for both performance and correctness reasons.

llvm-svn: 48976

llvm-svn: 48973

patch by David Chisnall.

llvm-svn: 48963

llvm-svn: 48947

Remove some unneeded code for LiveInterval joining, and fix a bug in the Phi elimination algorithm where we were accidentally reasoning about
the source rather than the destination.

llvm-svn: 48936

llvm-svn: 48916

llvm-svn: 48914

llvm-svn: 48908

In order to handle indexed nodes I had to introduce
a new constructor, and since I was there I factorized
the code in the various load constructors.

llvm-svn: 48894

nodes. This doesn't currently have much impact the generated code, but it
does produce simpler-looking SelectionDAGs, and consequently
simpler-looking ScheduleDAGs, because there are fewer spurious
dependencies.

In particular, CopyValueToVirtualRegister now uses the entry node as the
input chain dependency for new CopyToReg nodes instead of calling getRoot
and depending on the most recent memory reference.

Also, rename UnorderedChains to PendingExports and pull it up from being
a local variable in SelectionDAGISel::BuildSelectionDAG to being a
member variable of SelectionDAGISel, so that it doesn't have to be
passed around to all the places that need it.

llvm-svn: 48893

llvm-svn: 48873