1 /*
2 * Single-precision vector modf(x, *y) function.
3 *
4 * Copyright (c) 2024, Arm Limited.
5 * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
6 */
7
8 #include "v_math.h"
9 #include "test_sig.h"
10 #include "test_defs.h"
11
12 /* Modff algorithm. Produces exact values in all rounding modes. */
V_NAME_F1_L1(modf)13 float32x4_t VPCS_ATTR NOINLINE V_NAME_F1_L1 (modf) (float32x4_t x,
14 float *out_int)
15 {
16 /* Get integer component of x. */
17 float32x4_t rounded = vrndq_f32 (x);
18 vst1q_f32 (out_int, rounded);
19
20 /* Subtract integer component from input. */
21 uint32x4_t remaining = vreinterpretq_u32_f32 (vsubq_f32 (x, rounded));
22
23 /* Return +0 for integer x. */
24 uint32x4_t is_integer = vceqq_f32 (x, rounded);
25 return vreinterpretq_f32_u32 (vbicq_u32 (remaining, is_integer));
26 }
27
28 TEST_ULP (_ZGVnN4vl4_modff_frac, 0.0)
29 TEST_SYM_INTERVAL (_ZGVnN4vl4_modff_frac, 0, 1, 20000)
30 TEST_SYM_INTERVAL (_ZGVnN4vl4_modff_frac, 1, inf, 20000)
31
32 TEST_ULP (_ZGVnN4vl4_modff_int, 0.0)
33 TEST_SYM_INTERVAL (_ZGVnN4vl4_modff_int, 0, 1, 20000)
34 TEST_SYM_INTERVAL (_ZGVnN4vl4_modff_int, 1, inf, 20000)
35