both work right according to the new flags.

This removes the TII::isReallySideEffectFree predicate, and adds
TII::isInvariantLoad. 

It removes NeverHasSideEffects+MayHaveSideEffects and adds
UnmodeledSideEffects as machine instr flags.  Now the clients
can decide everything they need.

I think isRematerializable can be implemented in terms of the
flags we have now, though I will let others tackle that.

llvm-svn: 45843

x86 backend where instructions were not marked maystore/mayload, and perf issues where
instructions were not marked neverHasSideEffects.  It would be really nice if we could
write patterns for copy instructions.

I have audited all the x86 instructions down to MOVDQAmr.  The flags on others and on
other targets are probably not right in all cases, but no clients currently use this
info that are enabled by default.

llvm-svn: 45829

llvm-svn: 45823

llvm-svn: 45822

llvm-svn: 45819

Also, instructions with any nodes that are SDNPMayLoad also read memory.

llvm-svn: 45817

This is currently not set by anything.

llvm-svn: 45748

Make MachineInstr::getDesc return a reference instead
of a pointer, since it can never be null.

llvm-svn: 45695

all clients over to using predicates instead of these flags directly.
These are now private values which are only to be used to statically
initialize the tables.

llvm-svn: 45692

Evan, please review the comments I added to getNumDefs to make sure
that they are accurate, thx.

llvm-svn: 45687

TargetInstrDescriptor class and shrink to 16-bits, saving a 
word in TargetInstrDescriptor.  Add some comments.

llvm-svn: 45686

just unconditionally use the def name of the instruction.

llvm-svn: 45684

over to using them, instead of diddling Flags directly.  Change the
various flags from const variables to enums.

llvm-svn: 45677

llvm-svn: 45667

llvm-svn: 45656

instead of "ISD::STORE".  This allows us to mark target-specific dag
nodes as storing (such as ppc byteswap stores).  This allows us to remove
more explicit isStore flags from the .td files.

Finally, add a warning for when a .td file contains an explicit 
isStore and tblgen is able to infer it.

llvm-svn: 45654

intrinsic that writes to memory.

llvm-svn: 45650

occured in a pattern, but failed miserably.  The new code works for
any instruction that has a store in its pattern, including all the 
x86 mem op mem instructions.

The only target-independent code that uses this is branch folding,
so this won't change anything in practice.

llvm-svn: 45648

rearrange some code to allow inferring instr info from the pattern of the instr, but don't do so yet.

llvm-svn: 45647

llvm-svn: 45644

llvm-svn: 45643

llvm-svn: 45642

llvm-svn: 45640

llvm-svn: 45429

llvm-svn: 45419

side effects for machine instructions.

llvm-svn: 45022

llvm-svn: 44969

Target maintainers: please check that the instructions for your target are correctly marked.

llvm-svn: 44012

llvm-svn: 40709

llvm-svn: 40518

llvm-svn: 38498

llvm-svn: 37963

Instructions with ImmutablePredicateOperand aren't really predicable since their predicates are fixed at isel time.

llvm-svn: 37899

instruction flag, and use the flag along with a virtual member function
hook for targets to override if there are instructions that are only
trivially rematerializable with specific operands (i.e. constant pool
loads).

llvm-svn: 37728

with a general target hook to identify rematerializable instructions. Some
instructions are only rematerializable with specific operands, such as loads
from constant pools, while others are always rematerializable. This hook
allows both to be identified as being rematerializable with the same
mechanism.

llvm-svn: 37644

llvm-svn: 37643

Add clobbersPred - instruction that clobbers condition code / register which are used to predicate instructions.

llvm-svn: 37465

Rename M_PREDICATED to M_PREDICABLE; opcode can be specified isPredicable without having a PredicateOperand.

llvm-svn: 37116

llvm-svn: 37061

llvm-svn: 35159