LXR linux/arch/powerpc/math-emu/fcmpu.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/types.h>
   3#include <linux/errno.h>
   4#include <linux/uaccess.h>
   5
   6#include <asm/sfp-machine.h>
   7#include <math-emu/soft-fp.h>
   8#include <math-emu/double.h>
   9
  10int
  11fcmpu(u32 *ccr, int crfD, void *frA, void *frB)
  12{
  13        FP_DECL_D(A);
  14        FP_DECL_D(B);
  15        FP_DECL_EX;
  16        int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
  17        long cmp;
  18
  19#ifdef DEBUG
  20        printk("%s: %p (%08x) %d %p %p\n", __func__, ccr, *ccr, crfD, frA, frB);
  21#endif
  22
  23        FP_UNPACK_DP(A, frA);
  24        FP_UNPACK_DP(B, frB);
  25
  26#ifdef DEBUG
  27        printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  28        printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  29#endif
  30
  31        FP_CMP_D(cmp, A, B, 2);
  32        cmp = code[(cmp + 1) & 3];
  33
  34        __FPU_FPSCR &= ~(0x1f000);
  35        __FPU_FPSCR |= (cmp << 12);
  36
  37        *ccr &= ~(15 << ((7 - crfD) << 2));
  38        *ccr |= (cmp << ((7 - crfD) << 2));
  39
  40#ifdef DEBUG
  41        printk("CR: %08x\n", *ccr);
  42#endif
  43
  44        return 0;
  45}
  46