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View of /sml/trunk/src/MLRISC/alpha/README.alpha

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Revision 430 - (download) (annotate)
Wed Sep 8 09:47:00 1999 UTC (20 years, 2 months ago) by monnier
File size: 1247 byte(s)
This commit was generated by cvs2svn to compensate for changes in r429,
which included commits to RCS files with non-trunk default branches.
Changes to the instruction set

1. Numerous 64 bit extensions and floating point/integer conversion ops.
2. Conditional move instructions.

New optimizations in the Alpha backend
1.  Propagation of annotations
2.  SnADD SnSUB (shift and add, shift and substract)
    instructions are generated whenever possible. 
3.  Multiplication and division by a constant now generates special code.
4.  NOTB folding is implemented.   This optimization combines NOTB with
    other bit ops, such as ANDB, ORB, NOTB.
5.  COND expressions now generate compares or conditonal moves.

Special flags in the Alpha backend
1.  mode32bit -- when this flag is set, 
    LOAD(32,...) will always be sign extended.
    (NOTE: this flag has been eliminated.)
2.  useSU -- when this flag is set the floating point arithmetic
     will use the /SU rounding mode.  Otherwise, /SUD is used.
3.  multCost -- the estimated cost of integer multiplication. The 
    multiplication/division by a constant module uses this parameter.
4.  useMultByConst -- when this flag is set, multiplication by a constant
    that fits into one single instruction are always generated.

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