GVN and into its own pass.

llvm-svn: 49419

llvm-svn: 49415

add support for  pow(x, 2.0) -> x*x.

llvm-svn: 49411

are marked nounwind when compiling without
-fexceptions.

llvm-svn: 49393

llvm-svn: 49391

llvm-svn: 49382

llvm-svn: 49365

that need it (usually, grepping for some string
found in unwind info)

llvm-svn: 49364

llvm-svn: 49344

llvm-svn: 49343

llvm-svn: 49281

If it cannot be expanded, it will keep the old behaviour and try to shrink the constant.
Part of enhancement for PR2191.

llvm-svn: 49280

2. Coalescer can now create an interesting situation where a register def can
   reaches itself without being killed.

llvm-svn: 49246

llvm-svn: 49244

llvm-svn: 49190

llvm-svn: 49111

llvm-svn: 49048

llvm-svn: 49016

llvm-svn: 49012

EH info for these functions causes the tests to fail for
random reasons (e.g. looking for 'or' or counting lines
with asm-printer; labels count as lines.)

llvm-svn: 49003

llvm-svn: 49002

llvm-svn: 48994

llvm-svn: 48938

load value. This fixes PR2177.

llvm-svn: 48932

llvm-svn: 48881

llvm-svn: 48858

llvm-svn: 48853

llvm-svn: 48851

llvm-svn: 48837

Avoid commuting a def MI in order to coalesce a copy instruction away if any use of the same val# is a copy instruction that has already been coalesced.

llvm-svn: 48833

llvm's output .s files will go through gcc -std=c99
without triggering preprocesser errors.  Approach
suggested by Daveed Vandevoorde.

llvm-svn: 48808

Handle a special case xor undef, undef -> 0. Technically this should be transformed to undef. But this is such a common idiom (misuse) we are going to handle it.

llvm-svn: 48792

Handle a special case xor undef, undef -> 0. Technically this should be transformed to undef. But this is such a common idiom (misuse) we are going to handle it.

llvm-svn: 48791

other things, this allows the scheduler to unfold a load operand
in the 2008-01-08-SchedulerCrash.ll testcase, so it now successfully
clones the comparison to avoid a pushf+popf.

llvm-svn: 48777

llvm-svn: 48775

llvm-svn: 48762

llvm-svn: 48759

llvm-svn: 48758

mask.

llvm-svn: 48750

- SSE4.1 extractfps extracts a f32 into a gr32 register. Very useful! Not. Fix the instruction specification and teaches lowering code to use it only when the only use is a store instruction.

llvm-svn: 48746