fcmpu.c

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#include <linux/types.h>
#include <linux/errno.h>
#include <asm/uaccess.h>

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

int
fcmpu(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

    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 0;
}