powerpc/math-emu/fsubs.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/types.h>
0003 #include <linux/errno.h>
0004 #include <linux/uaccess.h>
0005
0006 #include <asm/sfp-machine.h>
0007 #include <math-emu/soft-fp.h>
0008 #include <math-emu/double.h>
0009 #include <math-emu/single.h>
0010
0011 int
0012 fsubs(void *frD, void *frA, void *frB)
0013 {
0014     FP_DECL_D(A);
0015     FP_DECL_D(B);
0016     FP_DECL_D(R);
0017     FP_DECL_EX;
0018
0019 #ifdef DEBUG
0020     printk("%s: %p %p %p\n", __func__, frD, frA, frB);
0021 #endif
0022
0023     FP_UNPACK_DP(A, frA);
0024     FP_UNPACK_DP(B, frB);
0025
0026 #ifdef DEBUG
0027     printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
0028     printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
0029 #endif
0030
0031     if (B_c != FP_CLS_NAN)
0032         B_s ^= 1;
0033
0034     if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
0035         FP_SET_EXCEPTION(EFLAG_VXISI);
0036
0037     FP_ADD_D(R, A, B);
0038
0039 #ifdef DEBUG
0040     printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
0041 #endif
0042
0043     __FP_PACK_DS(frD, R);
0044
0045     return FP_CUR_EXCEPTIONS;
0046 }