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135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*
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* pdp10-arith.h
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*
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* Provide functions for performing arithmetic operations on PDP10 integer types.
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* Currently only 36-bit signed operations are supported.
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*/
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#ifndef PDP10_ARITH_H
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#define PDP10_ARITH_H
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#include "pdp10-stdint.h"
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/* Zero-extend a pdp10_{u,}int36_t to the full width of its representation type.
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* Use this to prepare operands before unsigned operations, or to correct results
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* after signed operations.
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*/
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static inline pdp10_uint36_t pdp10_zext_uint36(pdp10_uint36_t x)
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{
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return x & PDP10_UINT36_MAX;
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}
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/* Sign-extend a pdp10_int36_t to the full width of its representation type.
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* Use this to prepare operands before signed operations.
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*
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* Based on the following trick for sign-extending an octet x: ((x & 0xff) ^ 0x80) - 0x80,
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* c.f. <http://sourceware.org/ml/binutils/2001-05/msg00093.html>.
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*/
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static inline pdp10_int36_t pdp10_sext_int36(pdp10_uint36_t x)
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{
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const pdp10_uint36_t PDP10_UINT36_SBIT = ~(PDP10_UINT36_MAX >> 1) & PDP10_UINT36_MAX;
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return ((x & PDP10_UINT36_MAX) ^ PDP10_UINT36_SBIT) - PDP10_UINT36_SBIT;
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}
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static inline pdp10_uint36_t pdp10_neg_int36(pdp10_uint36_t x)
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{
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return pdp10_zext_uint36(-pdp10_sext_int36(x));
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}
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static inline pdp10_uint36_t pdp10_not_int36(pdp10_uint36_t x)
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{
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return pdp10_zext_uint36(~pdp10_sext_int36(x));
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}
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static inline pdp10_uint36_t pdp10_add_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(pdp10_sext_int36(x) + pdp10_sext_int36(y));
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}
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static inline pdp10_uint36_t pdp10_sub_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(pdp10_sext_int36(x) - pdp10_sext_int36(y));
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}
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static inline pdp10_uint36_t pdp10_mul_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(pdp10_sext_int36(x) * pdp10_sext_int36(y));
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}
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static inline pdp10_uint36_t pdp10_div_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(pdp10_sext_int36(x) / pdp10_sext_int36(y));
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}
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static inline pdp10_uint36_t pdp10_rem_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(pdp10_sext_int36(x) % pdp10_sext_int36(y));
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}
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static inline pdp10_uint36_t pdp10_lsl_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(pdp10_zext_uint36(x) << pdp10_zext_uint36(y));
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}
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static inline pdp10_uint36_t pdp10_lsr_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(pdp10_zext_uint36(x) >> pdp10_zext_uint36(y));
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}
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static inline pdp10_uint36_t pdp10_asr_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(pdp10_sext_int36(x) >> pdp10_zext_uint36(y));
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}
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static inline pdp10_uint36_t pdp10_or_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return (pdp10_zext_uint36(x) | pdp10_zext_uint36(y));
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}
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static inline pdp10_uint36_t pdp10_and_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return (pdp10_zext_uint36(x) & pdp10_zext_uint36(y));
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}
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static inline pdp10_uint36_t pdp10_xor_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return (pdp10_zext_uint36(x) ^ pdp10_zext_uint36(y));
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}
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static inline int pdp10_eq_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(x) == pdp10_zext_uint36(y);
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}
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static inline int pdp10_ne_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_zext_uint36(x) != pdp10_zext_uint36(y);
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}
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static inline int pdp10_lt_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_sext_int36(x) < pdp10_sext_int36(y);
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}
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static inline int pdp10_gt_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_sext_int36(x) > pdp10_sext_int36(y);
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}
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static inline int pdp10_ge_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_sext_int36(x) >= pdp10_sext_int36(y);
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}
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static inline int pdp10_le_int36(pdp10_uint36_t x, pdp10_uint36_t y)
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{
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return pdp10_sext_int36(x) <= pdp10_sext_int36(y);
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}
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static inline int pdp10_nonzero_int36(pdp10_uint36_t x)
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{
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return pdp10_zext_uint36(x) != 0;
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}
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#endif /* PDP10_ARITH_H */
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