shuffle V1, <undef>, <undef, undef, 4, 5>
- Fix some suspicious logic into LowerVectorShuffle that cause less than
  optimal code by failing to identify MOVL (move to lowest element of a
  vector).

llvm-svn: 30171

using test, which provides nice simplifications like:

-       movl %edi, %ecx
-       andl $2, %ecx
-       cmpl $0, %ecx
+       testl $2, %edi
        je LBB1_11      #cond_next90

There are a couple of dagiselemitter deficiencies that this exposes, they will
be handled later.

llvm-svn: 30156

llvm-svn: 29752

llvm-svn: 29751

llvm-svn: 29750

llvm-svn: 29747

llvm-svn: 29746

llvm-svn: 29614

llvm-svn: 29604

llvm-svn: 29601

in the start of an array and a count of operands where applicable.  In many
cases, the number of operands is known, so this static array can be allocated
on the stack, avoiding the heap.  In many other cases, a SmallVector can be
used, which has the same benefit in the common cases.

I updated a lot of code calling getNode that takes a vector, but ran out of
time.  The rest of the code should be updated, and these methods should be
removed.

We should also do the same thing to eliminate the methods that take a
vector of MVT::ValueTypes.

It would be extra nice to convert the dagiselemitter to avoid creating vectors
for operands when calling getTargetNode.

llvm-svn: 29566

The CFE refers to all single-register constraints (like "A") by their 16-bit
name, even though the 8 or 32-bit version of the register may be needed.
The X86 backend should realize what is going on and redecode the name back
to its proper form.

llvm-svn: 29420

llvm-svn: 29307

llvm-svn: 29243

llvm-svn: 29234

This implements PR828 and CodeGen/X86/2006-07-12-InlineAsmQConstraint.ll

llvm-svn: 29118

CodeGen/X86/2006-07-10-InlineAsmAConstraint.ll

llvm-svn: 29101

Use that information when doing the transformation to merge multiple loads
into a 128-bit load.

llvm-svn: 29090

llvm-svn: 29085

(load x+8), (load x+12), <0, 1, 2, 3> to a single 128-bit load (aligned and
unaligned).

e.g.

__m128 test(float a, float b, float c, float d) {
  return _mm_set_ps(d, c, b, a);
}

_test:
        movups 4(%esp), %xmm0
        ret

llvm-svn: 29042

llvm-svn: 28999

Simplify X86CompilationCallback: always align to 16-byte boundary; don't save EAX/EDX if unnecessary.

llvm-svn: 28910

llvm-svn: 28796

llvm-svn: 28783

llvm-svn: 28736

function that is being lowered is forced to use FP. Currently this is only
true for main() / Cygwin.

llvm-svn: 28703

llvm-svn: 28617

llvm-svn: 28607

llvm-svn: 28581

RET chain, value1, sign1, value2, sign2, ...

llvm-svn: 28510

llvm-svn: 28505

vector arguments, not three.

llvm-svn: 28504

llvm-svn: 28499

llvm-svn: 28498

llvm-svn: 28497

llvm-svn: 28496

llvm-svn: 28488

llvm-svn: 28483

llvm-svn: 28481

llvm-svn: 28475