induction variable. The preRA scheduler is unaware of induction vars,
so we look for potential "virtual register cycles" instead.

Fixes <rdar://problem/8946719> Bad scheduling prevents coalescing

llvm-svn: 129100

It needed to be moved closer to the setjmp statement, because the code directly
after the setjmp needs to know about values that are on the stack. Also, the
'bitcast' of the function context was causing a dead load. This wouldn't be too
horrible, except that at -O0 it wasn't optimized out, and because it wasn't
using the correct base pointer (if there is a VLA), it would try to access a
value from a garbage address.
<rdar://problem/9130540>

llvm-svn: 128873

llvm-svn: 128868

transformations in target-specific DAG combines without causing DAGCombiner to
delete the same node twice. If you know of a better way to avoid this (see my
next patch for an example), please let me know.

llvm-svn: 128758

llvm-svn: 128730

Assign node order numbers to results of call instruction lowering. This should improve src line debug info when sdisel is used. rdar://9199118

llvm-svn: 128728

rdar://8911343

llvm-svn: 128696

It couldn't be used outside of the file because SDISelAsmOperandInfo
is local to SelectionDAGBuilder.cpp. Making it a static function avoids
a weird linkage dance.

llvm-svn: 128342

Yet another case of unchecked NULL node (for physreg copy).
May fix PR9509.

llvm-svn: 128266

Also cleaning up some duplicated code while I'm here.

llvm-svn: 128176

so the scheduler can't create new interferences on the copies
themselves. Prior to this fix the scheduler could get stuck in a loop
creating copies.
Fixes PR9509.

llvm-svn: 128164

llvm-svn: 128163

I'm tired of doing this manually for each checkout.
If anyone knows a better way debug isel for non-trivial tests feel
free to revert and let me know how to do it.

llvm-svn: 128132

llvm-svn: 128004

not have native support for this operation (such as X86).
The legalized code uses two vector INT_TO_FP operations and is faster
than scalarizing.

llvm-svn: 127951

BuildUDIV: If the divisor is even we can simplify the fixup of the multiplied value by introducing an early shift.

This allows us to compile "unsigned foo(unsigned x) { return x/28; }" into
	shrl	$2, %edi
	imulq	$613566757, %rdi, %rax
	shrq	$32, %rax
	ret

instead of
	movl    %edi, %eax
	imulq   $613566757, %rax, %rcx
	shrq    $32, %rcx
	subl    %ecx, %eax
	shrl    %eax
	addl    %ecx, %eax
	shrl    $4, %eax

on x86_64

llvm-svn: 127829

llvm-svn: 127809

llvm-svn: 127807

rather than an int. Thankfully, this only causes LLVM to miss optimizations, not
generate incorrect code.

This just fixes the zext at the return. We still insert an i32 ZextAssert when
reading a function's arguments, but it is followed by a truncate and another i8
ZextAssert so it is not optimized.

llvm-svn: 127766

llvm-svn: 127764

zext(undef) = 0, because the top bits will be zero.

llvm-svn: 127649

llvm-svn: 127600

llvm-svn: 127598

llvm-svn: 127496

Replace -dag-chain-limit flag with constant. It has survived a release cycle without being touched, so no longer needs to pollute the hidden-help text.

llvm-svn: 127468

Avoid replacing the value of a directly stored load with the stored value if the load is indexed. rdar://9117613.

llvm-svn: 127440

llvm-svn: 127380

llvm-svn: 127376

flexible.

If it returns a register class that's different from the input, then that's the
register class used for cross-register class copies.
If it returns a register class that's the same as the input, then no cross-
register class copies are needed (normal copies would do).
If it returns null, then it's not at all possible to copy registers of the
specified register class.

llvm-svn: 127368

This helps cases like 2008-07-19-movups-spills.ll, but doesn't have an obvious impact on benchmarks

llvm-svn: 127347

llvm-svn: 127335

with this before since none of the register tracking or nightly tests
had unschedulable nodes.

This should probably be refixed with a special default Node that just
returns some "don't touch me" values.

Fixes PR9427

llvm-svn: 127263

This change uses the MaxReorderWindow for both height and depth, which
tends to limit the negative effects of high register pressure.

llvm-svn: 127203

llvm-svn: 127175

llvm-svn: 127163

llvm-svn: 127131

Disable a couple of experimental heuristics to get the best results from the current implementation of -pre-RA-sched=list-ilp.

llvm-svn: 127113

llvm-svn: 127075

llvm-svn: 127071

llvm-svn: 127068