Enhanced heuristic to determine the *best* register to spill. Instead of picking the register with the lowest spill weight. Consider (up to) 2 additional registers with spill weights that are close to the lowest spill weight. The one with fewest defs and uses that conflicts with the current interval (weighted by loop depth) is the spill candidate.

This is not always a win, but there are much more wins than loses and wins tend to be more noticeable.

llvm-svn: 52554

llvm-svn: 52553

Added "Decl::getCodyBody()", a virtual method that returns the root AST node (Stmt*) that the Decl wraps (if any).  Currently this only returns a non-null value for FunctionDecl and ObjCMethodDecl.

llvm-svn: 52552

llvm-svn: 52551

llvm-svn: 52550

llvm-svn: 52549

float expansion (and sometimes vector splitting too).

llvm-svn: 52548

store, like the methods for loads (and neaten
those up a bit while there).

llvm-svn: 52547

integer of the same type.  Before it was "promotion",
but this is confusing because it is quite different
to promotion of integers.  Call it "softening" instead,
inspired by "soft float".

llvm-svn: 52546

llvm-svn: 52545

llvm-svn: 52544

getInsertedValueOperand accessors. Thanks Matthijs!

llvm-svn: 52543

instructions. Thanks to Matthijs Kooijman for pointing this out!

llvm-svn: 52542

llvm-svn: 52541

llvm-svn: 52540

llvm-svn: 52539

type wasn't changed.

llvm-svn: 52538

into T) when no return values are actually dead.

llvm-svn: 52537

DeadArgumentElimination and assert that the function type does not change if
nothing was changed. This should catch subtle changes in function type that are
not intended.

llvm-svn: 52536

llvm-svn: 52535

This is a fixed version that no longer uses multimap::equal_range, which
resulted in a pointer invalidation problem.

Also, DAE::InspectedFunctions was not really necessary, so it got removed.

Lastly, this version no longer applies the extra arg hack on functions who did
not have any arguments to start with.

llvm-svn: 52532

llvm-svn: 52531

definition for VS2005 (without SP1). It suppress the (bogus) M$ deprecated
warning."

Patch by Cédric Venet!

llvm-svn: 52530

llvm-svn: 52529

llvm-svn: 52528

types differ.  Patch by Nathan Keynes!

llvm-svn: 52527

llvm-svn: 52526

llvm-svn: 52525

llvm-svn: 52524

llvm-svn: 52523

llvm-svn: 52522

Change around the data structures used to store availability sets, resulting in a GVN+PRE that is faster that GVN alone was before.

llvm-svn: 52521

propagating constants across aggregate return values when
insertvalue and extractvalue are used.

llvm-svn: 52520

return statements and aggregate returns so that it handles both
correctly.

llvm-svn: 52519

llvm-svn: 52518

llvm-svn: 52517

llvm-svn: 52516

object.

llvm-svn: 52515

llvm-svn: 52514

llvm-svn: 52512