llvm-svn: 11625

by operator<< on MachineInstr's, and looking up what register "24" is all of the
time was greatly annoying.

llvm-svn: 11623

llvm-svn: 11622

interface: getMessage() is gone, use what() instead.

llvm-svn: 11621

the symbols are not demangled.

llvm-svn: 11620

llvm-svn: 11619

llvm-svn: 11611

llvm-svn: 11609

llvm-svn: 11601

llvm-svn: 11600

If there is an error running a tool, include the error message (e.g. assertion failure) in the exception

llvm-svn: 11597

of calling exit(1).

llvm-svn: 11593

llvm-svn: 11578

llvm-svn: 11577

llvm-svn: 11576

llvm-svn: 11575

llvm-svn: 11574

llvm-svn: 11573

llvm-svn: 11565

the globals graph.

llvm-svn: 11562

llvm-svn: 11560

llvm-svn: 11558

and it was only for debugging in the first place.

llvm-svn: 11557

llvm-svn: 11556

representation.. duh!

llvm-svn: 11554

llvm-svn: 11552

llvm-svn: 11550

llvm-svn: 11549

bits wide.

llvm-svn: 11548

llvm-svn: 11547

MOVSX, and MOVZX.

llvm-svn: 11546

and DECm{8,16,32} instructions.

llvm-svn: 11545

llvm-svn: 11544

llvm-svn: 11543

that need them.  This is very useful on CISCy targets like the X86 because it
reduces the total spill pressure, and makes better use of it's (large)
instruction set.  Though the X86 backend doesn't know how to rewrite many
instructions yet, this already makes a substantial difference on 176.gcc for
example:

Before:
Time:
   8.0099 ( 31.2%)   0.0100 ( 12.5%)   8.0199 ( 31.2%)   7.7186 ( 30.0%)  Local Register Allocator

Code quality:
734559 asm-printer           - Number of machine instrs printed
111395 ra-local              - Number of registers reloaded
 79902 ra-local              - Number of registers spilled
231554 x86-peephole          - Number of peephole optimization performed

After:
Time:
   7.8700 ( 30.6%)   0.0099 ( 19.9%)   7.8800 ( 30.6%)   7.7892 ( 30.2%)  Local Register Allocator
Code quality:
733083 asm-printer           - Number of machine instrs printed
  2379 ra-local              - Number of reloads fused into instructions
109046 ra-local              - Number of registers reloaded
 79881 ra-local              - Number of registers spilled
230658 x86-peephole          - Number of peephole optimization performed

So by fusing 2300 instructions, we reduced the  static number of instructions
by 1500, and reduces the number of peepholes (and thus the work) by about 900.
This also clearly reduces the number of reload/spill instructions that are
emitted.

llvm-svn: 11542

llvm-svn: 11541

llvm-svn: 11540

like compares and test's would be the next huge win...

llvm-svn: 11539

llvm-svn: 11538

llvm-svn: 11537