1 /* 2 * Single-precision SVE hypot(x) function. 3 * 4 * Copyright (c) 2023, Arm Limited. 5 * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception 6 */ 7 8 #include "sv_math.h" 9 #include "pl_sig.h" 10 #include "pl_test.h" 11 12 #define TinyBound 0x0c800000 /* asuint (0x1p-102). */ 13 #define Thres 0x73000000 /* 0x70000000 - TinyBound. */ 14 15 static svfloat32_t NOINLINE 16 special_case (svfloat32_t sqsum, svfloat32_t x, svfloat32_t y, svbool_t pg, 17 svbool_t special) 18 { 19 return sv_call2_f32 (hypotf, x, y, svsqrt_x (pg, sqsum), special); 20 } 21 22 /* SVE implementation of single-precision hypot. 23 Maximum error observed is 1.21 ULP: 24 _ZGVsMxvv_hypotf (0x1.6a213cp-19, -0x1.32b982p-26) got 0x1.6a2346p-19 25 want 0x1.6a2344p-19. */ 26 svfloat32_t SV_NAME_F2 (hypot) (svfloat32_t x, svfloat32_t y, 27 const svbool_t pg) 28 { 29 svfloat32_t sqsum = svmla_x (pg, svmul_x (pg, x, x), y, y); 30 31 svbool_t special = svcmpge ( 32 pg, svsub_x (pg, svreinterpret_u32 (sqsum), TinyBound), Thres); 33 34 if (unlikely (svptest_any (pg, special))) 35 return special_case (sqsum, x, y, pg, special); 36 37 return svsqrt_x (pg, sqsum); 38 } 39 40 PL_SIG (SV, F, 2, hypot, -10.0, 10.0) 41 PL_TEST_ULP (SV_NAME_F2 (hypot), 0.71) 42 PL_TEST_INTERVAL2 (SV_NAME_F2 (hypot), 0, inf, 0, inf, 10000) 43 PL_TEST_INTERVAL2 (SV_NAME_F2 (hypot), 0, inf, -0, -inf, 10000) 44 PL_TEST_INTERVAL2 (SV_NAME_F2 (hypot), -0, -inf, 0, inf, 10000) 45 PL_TEST_INTERVAL2 (SV_NAME_F2 (hypot), -0, -inf, -0, -inf, 10000) 46