xref: /openbmc/linux/arch/powerpc/math-emu/fcmpu.c (revision b2441318)
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
fcmpu(u32 * ccr,int crfD,void * frA,void * frB)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 }
46