loop idiom pass exposed.

llvm-svn: 122674

llvm-svn: 122667

earlyclobber stuff. This should fix PRs 2313 and 8157.

Unfortunately, no testcase, since it'd be dependent on register
assignments.

llvm-svn: 122663

new testcase.

llvm-svn: 122662

is the wrong hammer for this nail, and is probably right.

llvm-svn: 122661

aggressively.  In practice, this doesn't help anything though,
see the todo.

llvm-svn: 122660

should be correct now.

llvm-svn: 122659

llvm-svn: 122658

numbering, in which it considers (for example) "%a = add i32 %x, %y" and
"%b = add i32 %x, %y" to be equal because the operands are equal and the
result of the instructions only depends on the values of the operands.
This has almost no effect (it removes 4 instructions from gcc-as-one-file),
and perhaps slows down compilation: I measured a 0.4% slowdown on the large
gcc-as-one-file testcase, but it wasn't statistically significant.

llvm-svn: 122654

llvm-svn: 122653

llvm-svn: 122652

is necessary for executing the custom command that runs the
assember. Fixes PR8877.

llvm-svn: 122649

operands are visited before the instructions themselves.

llvm-svn: 122647

llvm-svn: 122645

llvm-svn: 122642

Fixes PR8861.

llvm-svn: 122641

llvm-svn: 122638

llvm-svn: 122637

llvm-svn: 122636

with 2-address instructions, for about a 3.5% speedup of StrongPHIElimination on
403.gcc.

llvm-svn: 122635

llvm-svn: 122632

llvm-svn: 122631

llvm-svn: 122630

llvm-svn: 122628

process those instructions that define phi sources. This is a 47% speedup of
StrongPHIElimination compile time on 403.gcc.

llvm-svn: 122627

llvm-svn: 122626

llvm-svn: 122625

llvm-svn: 122624

CMake: Add disabling optimization on MSVC8 and MSVC10 as workaround for some files in Target/ARM and Target/X86.

llvm-svn: 122623

llvm-svn: 122617

llvm-svn: 122616

llvm-svn: 122615

like 6 is a fixed point of that and so the previous tests were OK :-)

llvm-svn: 122614

llvm-svn: 122613

llvm-svn: 122612

llvm-svn: 122611

in the most obvious way.

llvm-svn: 122610

llvm-svn: 122609

it relies on assumptions that may not be true in the future.

llvm-svn: 122608

Multiple SPARC backend fixes: added Y register; updated select_cc, subx, subxcc defs/uses; 
and fixed CustomInserter.

llvm-svn: 122607