llvm-svn: 18803

llvm-svn: 18802

llvm-svn: 18801

llvm-svn: 18800

llvm-svn: 18799

llvm-svn: 18798

llvm-svn: 18797

 1. Actually increment the Statistic for the GV elim optzn
 2. When resolving undef branches, only resolve branches in executable blocks,
    avoiding marking a bunch of completely dead blocks live.  This has a big
    impact on the quality of the generated code.

With this patch, we positively rip up vortex, compiling Ut_MoveBytes to a
single memcpy call. In vortex we get this:

     12 ipsccp           - Number of globals found to be constant
    986 ipsccp           - Number of arguments constant propagated
   1378 ipsccp           - Number of basic blocks unreachable
   8919 ipsccp           - Number of instructions removed

llvm-svn: 18796

llvm-svn: 18795

ctor parameters can be defaulted.

Print the transformed llvm code input to the instruction selector
when -print-machineinstrs is on, just like V9.

llvm-svn: 18794

*or g0, x      add g0, x          recognized * as a move)
 or  x, g0     add  x, g0
 or  0, x      add  0, x
 or  x, 0      add  x, 0

llvm-svn: 18793

* Don't emit the Index * ElementSize multiply if Index is a constant.
* Use a shift, not a multiply, if ElementSize is 1/2/4/8.
* If ElementSize fits in the immediate field of SMUL, then put it there.

Fix a bug where struct offsets might be truncated (ConstantSInt::get is
now used instead of ConstantInt::get).

llvm-svn: 18792

ones are failing in cbe.

llvm-svn: 18791

non-address-taken global variables.

llvm-svn: 18790

llvm-svn: 18789

llvm-svn: 18788

llvm-svn: 18787

In functions where we fully constant prop the return value, replace all
ret instructions with 'ret undef'.

llvm-svn: 18786

llvm-svn: 18785

llvm-svn: 18783

llvm-svn: 18782

llvm-svn: 18781

llvm-svn: 18780

llvm-svn: 18779

llvm-svn: 18776

llvm-svn: 18775

llvm-svn: 18774

happen in practice, but IP-SCCP can trigger it.

llvm-svn: 18773

llvm-svn: 18769

llvm-svn: 18767

and the failure on make_dparser last night.

llvm-svn: 18766

last night.

llvm-svn: 18765

llvm-svn: 18764

llvm-svn: 18763

slipping through into the instruction selector, which can't deal with
them yet.

llvm-svn: 18758

llvm-svn: 18757

llvm-svn: 18756

matter with my sparcv8 libstdc++.a) and to-do list.

llvm-svn: 18755

llvm-svn: 18753

This implements SCCP/ipsccp-basic.ll, rips apart Olden/mst (as described in
PR415), and does other nice things.

There is still more to come with this, but it's a start.

llvm-svn: 18752