1//===----------------------Hexagon builtin routine ------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9
10	.macro FUNCTION_BEGIN name
11	.text
12	.p2align 5
13	.globl \name
14	.type  \name, @function
15\name:
16	.endm
17
18	.macro FUNCTION_END name
19	.size  \name, . - \name
20	.endm
21
22
23FUNCTION_BEGIN __hexagon_umoddi3
24	{
25		r6 = cl0(r1:0)              // count leading 0's of dividend (numerator)
26		r7 = cl0(r3:2)              // count leading 0's of divisor (denominator)
27		r5:4 = r3:2                 // divisor moved into working registers
28		r3:2 = r1:0                 // dividend is the initial remainder, r3:2 contains remainder
29	}
30	{
31		r10 = sub(r7,r6)            // left shift count for bit & divisor
32		r1:0 = #0                   // initialize quotient to 0
33		r15:14 = #1                 // initialize bit to 1
34	}
35	{
36		r11 = add(r10,#1)           // loop count is 1 more than shift count
37		r13:12 = lsl(r5:4,r10)      // shift divisor msb into same bit position as dividend msb
38		r15:14 = lsl(r15:14,r10)    // shift the bit left by same amount as divisor
39	}
40	{
41		p0 = cmp.gtu(r5:4,r3:2)     // check if divisor > dividend
42		loop0(1f,r11)               // register loop
43	}
44	{
45		if (p0) jump .hexagon_umoddi3_return           // if divisor > dividend, we're done, so return
46	}
47	.falign
481:
49	{
50		p0 = cmp.gtu(r13:12,r3:2)   // set predicate reg if shifted divisor > current remainder
51	}
52	{
53		r7:6 = sub(r3:2, r13:12)    // subtract shifted divisor from current remainder
54		r9:8 = add(r1:0, r15:14)    // save current quotient to temp (r9:8)
55	}
56	{
57		r1:0 = vmux(p0, r1:0, r9:8) // choose either current quotient or new quotient (r9:8)
58		r3:2 = vmux(p0, r3:2, r7:6) // choose either current remainder or new remainder (r7:6)
59	}
60	{
61		r15:14 = lsr(r15:14, #1)    // shift bit right by 1 for next iteration
62		r13:12 = lsr(r13:12, #1)    // shift "shifted divisor" right by 1 for next iteration
63	}:endloop0
64
65.hexagon_umoddi3_return:
66	{
67		r1:0 = r3:2
68		jumpr r31
69	}
70FUNCTION_END __hexagon_umoddi3
71
72  .globl __qdsp_umoddi3
73  .set   __qdsp_umoddi3, __hexagon_umoddi3
74