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#define A r1:0
10#define B r3:2
11#define ATMP r5:4
12
13
14#define Q6_ALIAS(TAG) .global __qdsp_##TAG ; .set __qdsp_##TAG, __hexagon_##TAG
15#define END(TAG) .size TAG,.-TAG
16
17// Min and Max return A if B is NaN, or B if A is NaN
18// Otherwise, they return the smaller or bigger value
19//
20// If values are equal, we want to favor -0.0 for min and +0.0 for max.
21
22// Compares always return false for NaN
23// if (isnan(A)) A = B; if (A > B) A = B will only trigger at most one of those options.
24
25	.text
26	.global __hexagon_mindf3
27	.global __hexagon_maxdf3
28	.global fmin
29	.type fmin,@function
30	.global fmax
31	.type fmax,@function
32	.type __hexagon_mindf3,@function
33	.type __hexagon_maxdf3,@function
34	Q6_ALIAS(mindf3)
35	Q6_ALIAS(maxdf3)
36	.p2align 5
37__hexagon_mindf3:
38fmin:
39	{
40		p0 = dfclass(A,#0x10)		// If A is a number
41		p1 = dfcmp.gt(A,B)		// AND B > A, don't swap
42		ATMP = A
43	}
44	{
45		if (p0) A = B			// if A is NaN use B
46		if (p1) A = B			// gt is always false if either is NaN
47		p2 = dfcmp.eq(A,B)		// if A == B
48		if (!p2.new) jumpr:t r31
49	}
50	// A == B, return A|B to select -0.0 over 0.0
51	{
52		A = or(ATMP,B)
53		jumpr r31
54	}
55END(__hexagon_mindf3)
56	.falign
57__hexagon_maxdf3:
58fmax:
59	{
60		p0 = dfclass(A,#0x10)
61		p1 = dfcmp.gt(B,A)
62		ATMP = A
63	}
64	{
65		if (p0) A = B
66		if (p1) A = B
67		p2 = dfcmp.eq(A,B)
68		if (!p2.new) jumpr:t r31
69	}
70	// A == B, return A&B to select 0.0 over -0.0
71	{
72		A = and(ATMP,B)
73		jumpr r31
74	}
75END(__hexagon_maxdf3)
76