55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <asm/uaccess.h>
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#include "soft-fp.h"
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#include "double.h"
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int
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fnmsub(void *frD, void *frA, void *frB, void *frC)
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{
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FP_DECL_D(R);
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FP_DECL_D(A);
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FP_DECL_D(B);
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FP_DECL_D(C);
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FP_DECL_D(T);
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int ret = 0;
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#ifdef DEBUG
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printk("%s: %p %p %p %p\n", __FUNCTION__, frD, frA, frB, frC);
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#endif
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__FP_UNPACK_D(A, frA);
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__FP_UNPACK_D(B, frB);
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__FP_UNPACK_D(C, frC);
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#ifdef DEBUG
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printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
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printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
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printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
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#endif
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if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
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(A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
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ret |= EFLAG_VXIMZ;
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FP_MUL_D(T, A, C);
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if (B_c != FP_CLS_NAN)
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B_s ^= 1;
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if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
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ret |= EFLAG_VXISI;
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FP_ADD_D(R, T, B);
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if (R_c != FP_CLS_NAN)
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R_s ^= 1;
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#ifdef DEBUG
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printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
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#endif
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return (ret | __FP_PACK_D(frD, R));
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}
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