llvm-svn: 24689

A few helper fragments for loads. e.g. (i8 (load addr:$src)) -> (loadi8 addr:$src). Only to improve readibility.

llvm-svn: 24688

llvm-svn: 24687

llvm-svn: 24686

llvm-svn: 24685

llvm-svn: 24684

llvm-svn: 24683

  This enables the removal of some explicit type casts.
* Rename immZExt8 to i16ZExt8 as well.

llvm-svn: 24682

llvm-svn: 24681

llvm-svn: 24678

llvm-svn: 24677

llvm-svn: 24675

base or index operands being selected.

llvm-svn: 24674

first before the chain.
e.g.
int X;

int foo(int x)
{
  x += X + 37;
  return x;
}

If chain operand is selected first, we would generate:
	movl X, %eax
	movl 4(%esp), %ecx
	leal 37(%ecx,%eax), %eax

rather than
	movl $37, %eax
	addl 4(%esp), %eax
	addl X, %eax

which does not require %ecx. (Due to ADD32rm not matching.)

llvm-svn: 24673

llvm-svn: 24672

llvm-svn: 24671

llvm-svn: 24670

llvm-svn: 24668

186.crafty by about 16% (from 15.109s to 13.045s) on my system.

This turns allocas with unions/casts into scalars.  For example crafty has
something like this:

    union doub {
      unsigned short i[4];
      long long d;
    };
int f(long long a) {
  return ((union doub){.d=a}).i[1];
}

Instead of generating loads and stores to an alloca, we now promote the
whole thing to a scalar long value.

This implements: Transforms/ScalarRepl/AggregatePromote.ll

llvm-svn: 24667

llvm-svn: 24664

llvm-svn: 24663

llvm-svn: 24662

llvm-svn: 24661

llvm-svn: 24660

llvm-svn: 24659

FP select improvements (and likely breakage), oh and crazy people might want to *return* floating point values.  Don't see why myself

llvm-svn: 24658

them in the PPC backend, to simplify some logic out of Select and
SelectAddr.

llvm-svn: 24657

llvm-svn: 24656

* Added X86 dec patterns.

llvm-svn: 24654

llvm-svn: 24653

hopefully use patterns in the near future.

llvm-svn: 24651

must be a pointer.  This removes a type check out of the code generated by
tblgen for load matching.

llvm-svn: 24650

llvm-svn: 24648

llvm-svn: 24646

linking the entire program into one bc file.

llvm-svn: 24645

out to me.

llvm-svn: 24644

llvm-svn: 24641

1. Only forward subst offsets into loads and stores, not into arbitrary
   things, where it will likely become a load.
2. If the source is a cast from pointer, forward subst the cast as well,
   allowing us to fold the cast away (improving cases when the cast is
   from an alloca or global).

This hasn't been fully tested, but does appear to further reduce register
pressure and improve code.  Lets let the testers grind on it a bit. :)

llvm-svn: 24640

llvm-svn: 24639

llvm-svn: 24638