41 lines
640 B
C
41 lines
640 B
C
/*
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* Written by J.T. Conklin, Apr 10, 1995
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* Public domain.
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*/
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#include <ieeefp.h>
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#include <machine/cpufunc.h>
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#include <machine/fpu.h>
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fp_except
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fpsetsticky(sticky)
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fp_except sticky;
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{
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fp_except old;
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fp_except new;
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fp_except ebits = FPC_IEN | FPC_OVE | FPC_IVE | FPC_DZE | FPC_UEN | FPC_UNDE;
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if (sticky & FPC_UNDE) {
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sticky |= FPC_UEN;
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sticky &= ~FPC_UNDE;
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}
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sfsr(old);
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new = old;
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new &= ebits;
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new |= (sticky & ebits) << 1;
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lfsr(new);
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/* Map FPC_UF to soft underflow enable */
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if (old & FPC_UF) {
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old |= FPC_UNDE << 1;
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old &= FPC_UF;
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} else
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old &= ~(FPC_UNDE << 1);
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old >>= 1;
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return old & ebits;
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}
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