powerpc/math-emu/fmul.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
0010 int
0011 fmul(void *frD, void *frA, void *frB)
0012 {
0013     FP_DECL_D(A);
0014     FP_DECL_D(B);
0015     FP_DECL_D(R);
0016     FP_DECL_EX;
0017
0018 #ifdef DEBUG
0019     printk("%s: %p %p %p\n", __func__, frD, frA, frB);
0020 #endif
0021
0022     FP_UNPACK_DP(A, frA);
0023     FP_UNPACK_DP(B, frB);
0024
0025 #ifdef DEBUG
0026     printk("A: %ld %lu %lu %ld (%ld) [%08lx.%08lx %lx]\n",
0027            A_s, A_f1, A_f0, A_e, A_c, A_f1, A_f0, A_e + 1023);
0028     printk("B: %ld %lu %lu %ld (%ld) [%08lx.%08lx %lx]\n",
0029            B_s, B_f1, B_f0, B_e, B_c, B_f1, B_f0, B_e + 1023);
0030 #endif
0031
0032     if ((A_c == FP_CLS_INF && B_c == FP_CLS_ZERO) ||
0033         (A_c == FP_CLS_ZERO && B_c == FP_CLS_INF))
0034         FP_SET_EXCEPTION(EFLAG_VXIMZ);
0035
0036     FP_MUL_D(R, A, B);
0037
0038 #ifdef DEBUG
0039     printk("D: %ld %lu %lu %ld (%ld) [%08lx.%08lx %lx]\n",
0040            R_s, R_f1, R_f0, R_e, R_c, R_f1, R_f0, R_e + 1023);
0041 #endif
0042
0043     __FP_PACK_D(frD, R);
0044
0045     return FP_CUR_EXCEPTIONS;
0046 }