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
  10 int
  11 fcmpu(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 }