positive where pointers would be leaked on llvm_shutdown.

llvm-svn: 97759

as nounwind are marked with a -1 call-site value. This is necessary to, for
example, correctly process exceptions thrown from within an "unexpected"
execption handler (see SingleSource/Regression/C++/EH/expection_spec_test.cpp).

llvm-svn: 97757

frame pointer.

llvm-svn: 97755

llvm-svn: 97752

llvm-svn: 97747

an undef value.  This is only going to come up for bugpoint-reduced tests --
correct programs will not access memory at undefined addresses -- so it's not
worth the effort of doing anything more aggressive.

llvm-svn: 97745

We need this so can not bake DESTDIR into the O'Caml symlinks.

llvm-svn: 97743

These instructions technically define AL,AH, but a trick in X86ISelDAGToDAG
reads AX in order to avoid reading AH with a REX instruction.

Fix PR6489.

llvm-svn: 97742

clobber registers in a different order.

llvm-svn: 97741

llvm-svn: 97740

register if it isn't possible to match the indexes *and* the base.
This fixes some fast isel rejects of load instructions on oggenc.

llvm-svn: 97739

llvm-svn: 97738

just count references to it from JIT output to decide when to destroy it.  This
patch waits to destroy the JIT's memory of a stub until the Function it refers
to is destroyed.  External function stubs and GVIndirectSyms aren't destroyed
until the JIT itself is.

llvm-svn: 97737

llvm-svn: 97735

Instruction (PLI) for disassembly only.

According to A8.6.120 PLI (immediate, literal), for example, different
instructions are generated for "pli [pc, #0]" and "pli [pc, #-0"].  The
disassembler solves it by mapping -0 (negative zero) to -1, -1 to -2, ..., etc.

llvm-svn: 97731

transformation much more careful. Truncating binary '01' to '1' sounds like it's
safe until you realize that it switched from positive to negative under a signed
interpretation, and that depends on the icmp predicate.

Also a few miscellaneous cleanups.

llvm-svn: 97721

the set.

llvm-svn: 97720

llvm-svn: 97713

llvm-svn: 97709

Look ahead a bit to determine if a physical register def that is not marked dead is really alive. This is necessary to catch a lot of common cse opportunities for targets like x86.

llvm-svn: 97706

as the very last thing before node emission.  This should
dramatically reduce the number of times we do 'MatchAddress'
on X86, speeding up compile time.  This also improves comments
in the tables and shrinks the table a bit, now down to 
80506 bytes for x86.

llvm-svn: 97703

destroyed, it could leave stubs in the StubToResolverMap, which would confuse
the lookup for subsequent lazy compilations.

llvm-svn: 97698

a patch my Micah Villmow for PR6465.

llvm-svn: 97692

llvm-svn: 97691

llvm-svn: 97690

Fix a logic error. An instruction that has a live physical register def cannot be CSE'ed, but it *can* be used to replace a common subexpression.

llvm-svn: 97688

llvm-svn: 97687

Move MachineInstrExpressionTrait::getHashValue() out of line so it can skip over only virtual register defs. This matches what isEqual() is doing.

llvm-svn: 97680

Re-apply r97667 but with a little bit of thought put into the patch. This implements a special DenseMapInfo trait for DenseMap<MachineInstr*> that compare the value of the MachineInstr rather than the pointer value. Since the hashing and equality test functions ignore defs it's useful for doing CSE kind optimization.

llvm-svn: 97678

MULS <Rdm>, <Rn>, <Rdm>

according to A8.6.105 MUL Encoding T1.

llvm-svn: 97675

llvm-svn: 97673

llvm-svn: 97670

llvm-svn: 97667

CSE and recursive RAUW calls delete a node from the use list,
invalidating the use list iterator. There's currently no known
way to reproduce this in an unmodified LLVM, however there's no
fundamental reason why a SelectionDAG couldn't be formed which
would trigger this case.

llvm-svn: 97665

Machine CSE work in progress. It's doing some CSE now. But implicit def of physical registers are getting in the way.

llvm-svn: 97664

llvm-svn: 97663

Fix PR6444, note still doesn't compile libgcc2 all the way, but fixes that error.  May not fix it in an ABI complient way.  It wasn't clear what gcc does

llvm-svn: 97660

llvm-svn: 97659

--- Reverse-merging r97592 into '.':
U    lib/CodeGen/TargetLoweringObjectFileImpl.cpp

llvm-svn: 97657

and STRHT for disassembly only.

llvm-svn: 97655