This also implements some new features for the indvars pass, including
linear function test replacement, exit value substitution, and it works with
a much more general class of induction variables and loops.

llvm-svn: 12620

llvm-svn: 12619

llvm-svn: 12618

This actually causes us to turn code like:

  return C ? A : B;

into a select instruction.

llvm-svn: 12617

llvm-svn: 12615

Move lowerselect pass to come after preselection.  Move machine
code construction and stack slots pass to come right before instruction
selection. This is to help fix perlbmk.

Update comments.

Make the sequence of passes in addPassesToJITCompile look more like
the sequence of passes in addPassesToEmitAssembly, including support
for -print-machineinstrs.

llvm-svn: 12614

llvm-svn: 12613

llvm-svn: 12611

llvm-svn: 12610

Patch contributed by Reid Spencer

llvm-svn: 12609

llvm-svn: 12607

llvm-svn: 12600

llvm-svn: 12597

llvm-svn: 12595

Testcase: LoopSimplify/2004-04-01-IncorrectDomUpdate.ll

llvm-svn: 12592

llvm-svn: 12589

Implement a small optimization.  In test/Regression/CodeGen/X86/select.ll,
we now generate this for foldSel3:

foldSel3:
        mov %AL, BYTE PTR [%ESP + 4]
        fld DWORD PTR [%ESP + 8]
        fld DWORD PTR [%ESP + 12]
        mov %EAX, DWORD PTR [%ESP + 16]
        mov %ECX, DWORD PTR [%ESP + 20]
        cmp %EAX, %ECX
        fxch %ST(1)
        fcmovae %ST(0), %ST(1)
***     fstp %ST(1)
        ret

Instead of:

foldSel3:
        mov %AL, BYTE PTR [%ESP + 4]
        fld DWORD PTR [%ESP + 8]
        fld DWORD PTR [%ESP + 12]
        mov %EAX, DWORD PTR [%ESP + 16]
        mov %ECX, DWORD PTR [%ESP + 20]
        cmp %EAX, %ECX
        fxch %ST(1)
        fcmovae %ST(0), %ST(1)
***     fxch %ST(1)
***     fstp %ST(0)
        ret

In practice, this only effects code size: performance should be basically
unaffected.

llvm-svn: 12588

llvm-svn: 12587

llvm-svn: 12579

llvm-svn: 12578

the X86 does not support a full set of fp cmove instructions, so we can't always
fold the condition into the select.  :(  Yuck.

llvm-svn: 12577

llvm-svn: 12576

llvm-svn: 12575

that require the asmwriter to be extended (printing implicit uses before the
explicit operands)

llvm-svn: 12574

llvm-svn: 12573

llvm-svn: 12572

llvm-svn: 12571

easily steal it for a separate use in the reoptimizer.

llvm-svn: 12568

In ReadArchiveBuffer, make sure that MemberName is set in the case where
getObjectType would want to return SVR4LongFilename.

llvm-svn: 12567

llvm-svn: 12566

this and the other patches 253.perlbmk links again.

llvm-svn: 12565

llvm-svn: 12564

llvm-svn: 12563

llvm-svn: 12562

llvm-svn: 12561

using our broad selection of movcc instructions.  :)

llvm-svn: 12560

llvm-svn: 12554

folding compares into the select yet.

llvm-svn: 12553

llvm-svn: 12551

we never generated them

Make indentation a bit more consistent

llvm-svn: 12549