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[/] [mlite/] [trunk/] [vhdl/] [mult.vhd] - Diff between revs 139 and 196
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| Rev 139 |
Rev 196 |
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-- COPYRIGHT: Software placed into the public domain by the author.
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-- COPYRIGHT: Software placed into the public domain by the author.
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-- Software 'as is' without warranty. Author liable for nothing.
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-- Software 'as is' without warranty. Author liable for nothing.
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-- DESCRIPTION:
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-- DESCRIPTION:
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-- Implements the multiplication and division unit in 32 clocks.
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-- Implements the multiplication and division unit in 32 clocks.
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--
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--
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-- To reduce space, compile your code using the flag "-mno-mul" which
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-- will use software base routines in math.c if USE_SW_MULT is defined.
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-- Then remove references to the entity mult in mlite_cpu.vhd.
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--
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-- MULTIPLICATION
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-- MULTIPLICATION
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-- long64 answer = 0
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-- long64 answer = 0
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-- for(i = 0; i < 32; ++i)
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-- for(i = 0; i < 32; ++i)
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-- {
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-- {
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-- answer = (answer >> 1) + (((b&1)?a:0) << 31);
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-- answer = (answer >> 1) + (((b&1)?a:0) << 31);
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