1*f3087befSAndrew Turner /* 2*f3087befSAndrew Turner * Double-precision vector modf(x, *y) function. 3*f3087befSAndrew Turner * 4*f3087befSAndrew Turner * Copyright (c) 2024, Arm Limited. 5*f3087befSAndrew Turner * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception 6*f3087befSAndrew Turner */ 7*f3087befSAndrew Turner 8*f3087befSAndrew Turner #include "v_math.h" 9*f3087befSAndrew Turner #include "test_sig.h" 10*f3087befSAndrew Turner #include "test_defs.h" 11*f3087befSAndrew Turner 12*f3087befSAndrew Turner /* Modf algorithm. Produces exact values in all rounding modes. */ 13*f3087befSAndrew Turner float64x2_t VPCS_ATTR V_NAME_D1_L1 (modf) (float64x2_t x, double *out_int) 14*f3087befSAndrew Turner { 15*f3087befSAndrew Turner /* Get integer component of x. */ 16*f3087befSAndrew Turner float64x2_t rounded = vrndq_f64 (x); 17*f3087befSAndrew Turner vst1q_f64 (out_int, rounded); 18*f3087befSAndrew Turner 19*f3087befSAndrew Turner /* Subtract integer component from input. */ 20*f3087befSAndrew Turner uint64x2_t remaining = vreinterpretq_u64_f64 (vsubq_f64 (x, rounded)); 21*f3087befSAndrew Turner 22*f3087befSAndrew Turner /* Return +0 for integer x. */ 23*f3087befSAndrew Turner uint64x2_t is_integer = vceqq_f64 (x, rounded); 24*f3087befSAndrew Turner return vreinterpretq_f64_u64 (vbicq_u64 (remaining, is_integer)); 25*f3087befSAndrew Turner } 26*f3087befSAndrew Turner 27*f3087befSAndrew Turner TEST_ULP (_ZGVnN2vl8_modf_frac, 0.0) 28*f3087befSAndrew Turner TEST_SYM_INTERVAL (_ZGVnN2vl8_modf_frac, 0, 1, 20000) 29*f3087befSAndrew Turner TEST_SYM_INTERVAL (_ZGVnN2vl8_modf_frac, 1, inf, 20000) 30*f3087befSAndrew Turner 31*f3087befSAndrew Turner TEST_ULP (_ZGVnN2vl8_modf_int, 0.0) 32*f3087befSAndrew Turner TEST_SYM_INTERVAL (_ZGVnN2vl8_modf_int, 0, 1, 20000) 33*f3087befSAndrew Turner TEST_SYM_INTERVAL (_ZGVnN2vl8_modf_int, 1, inf, 20000) 34