// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/uaccess.h>

#include <asm/sfp-machine.h>
#include <math-emu/soft-fp.h>
#include <math-emu/double.h>

int
fcmpo(u32 *ccr, int crfD, void *frA, void *frB)
{
        FP_DECL_D(A);
        FP_DECL_D(B);
        FP_DECL_EX;
        int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
        long cmp;

#ifdef DEBUG
        printk("%s: %p (%08x) %d %p %p\n", __func__, ccr, *ccr, crfD, frA, frB);
#endif

        FP_UNPACK_DP(A, frA);
        FP_UNPACK_DP(B, frB);

#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);
#endif

        if (A_c == FP_CLS_NAN || B_c == FP_CLS_NAN)
                FP_SET_EXCEPTION(EFLAG_VXVC);

        FP_CMP_D(cmp, A, B, 2);
        cmp = code[(cmp + 1) & 3];

        __FPU_FPSCR &= ~(0x1f000);
        __FPU_FPSCR |= (cmp << 12);

        *ccr &= ~(15 << ((7 - crfD) << 2));
        *ccr |= (cmp << ((7 - crfD) << 2));

#ifdef DEBUG
        printk("CR: %08x\n", *ccr);
#endif

        return FP_CUR_EXCEPTIONS;
}