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[smlnj] View of /sml/trunk/src/MLRISC/sparc/README.sparc
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View of /sml/trunk/src/MLRISC/sparc/README.sparc

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Revision 651 - (download) (annotate)
Thu Jun 1 18:34:03 2000 UTC (20 years, 11 months ago) by monnier
File size: 1133 byte(s)
bring revisions from the vendor branch to the trunk
Changes to the instruction set

1. The cc bit in ARITH ops have been removed.  The CC option
   is now merged with the arithmetic opcode.  I think this saves
   a bit of space since most of the time the cc bit is false.

2. The following V9 instructions have been added

        MOVcc  (* conditional moves on condition code *)
        FMOVcc (* conditional moves on condition code *)
        MOVR   (* conditional moves on integer condition *)
        BR     (* branch on integer register with prediction *)
        BP     (* branch on integer condition with prediction *)

   Not everything is generated by the instruction selection module yet.

New optimizations in the Sparc backend
1.  Strength reduction for multiply/division by a constant. 
2.  Propagation of annotations
3.  There is a flag is determines whether we should use BR instructions.
    These branch instructions branches on the value of an integer register.
4.  NOTB folding is implemented

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