fnmadd.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:1k
- /*
- * BK Id: SCCS/s.fnmadd.c 1.6 05/17/01 18:14:22 cort
- */
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <asm/uaccess.h>
- #include "soft-fp.h"
- #include "double.h"
- int
- fnmadd(void *frD, void *frA, void *frB, void *frC)
- {
- FP_DECL_D(R);
- FP_DECL_D(A);
- FP_DECL_D(B);
- FP_DECL_D(C);
- FP_DECL_D(T);
- int ret = 0;
- #ifdef DEBUG
- printk("%s: %p %p %p %pn", __FUNCTION__, frD, frA, frB, frC);
- #endif
- __FP_UNPACK_D(A, frA);
- __FP_UNPACK_D(B, frB);
- __FP_UNPACK_D(C, frC);
- #ifdef DEBUG
- printk("A: %ld %lu %lu %ld (%ld)n", A_s, A_f1, A_f0, A_e, A_c);
- printk("B: %ld %lu %lu %ld (%ld)n", B_s, B_f1, B_f0, B_e, B_c);
- printk("C: %ld %lu %lu %ld (%ld)n", C_s, C_f1, C_f0, C_e, C_c);
- #endif
- if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
- (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
- ret |= EFLAG_VXIMZ;
- FP_MUL_D(T, A, C);
- if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
- ret |= EFLAG_VXISI;
- FP_ADD_D(R, T, B);
- if (R_c != FP_CLS_NAN)
- R_s ^= 1;
- #ifdef DEBUG
- printk("D: %ld %lu %lu %ld (%ld)n", R_s, R_f1, R_f0, R_e, R_c);
- #endif
- return (ret | __FP_PACK_D(frD, R));
- }