loop idiom pass exposed.

llvm-svn: 122674

llvm-svn: 122672

llvm-svn: 122667

llvm-svn: 122666

limitations, this kicks in dozens of times in the 4 specfp2000 benchmarks, 
and hundreds of times in the int part.  It also kicks in hundreds of times 
in multisource.

This kicks in right before loop deletion, which has the pleasant effect of
deleting loops that *just* do a memset.

llvm-svn: 122664

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

even compile, let alone work.

llvm-svn: 122657

using a separate objects directory.

llvm-svn: 122656

not locally.

llvm-svn: 122655

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

llvm-svn: 122651

llvm-svn: 122650

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

llvm-svn: 122649

options. If we are building with exceptions/rtti disabled, we replace
/EHsc with /EHs-c- and /GR with /GR-, respectively. If we just add the
disabling options we get warnings like this:

cl : Command line warning D9025 : overriding '/EHs' with '/EHs-'

llvm-svn: 122648

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

autoconf: Add --disable-embed-stdcxx to suppress linking libstdc++.a into llvm.dll with --enable-shared on Cygming.

Cygwin has stdc++.dll in it's distribution, and we can assume distro's stdc++.dll might be available.

llvm-svn: 122622

This would be needed to build pthread*.dll-free distribution on recent MinGW-MSYS distros.

llvm-svn: 122621