1//===-- truncdfsf2vfp.S - Implement truncdfsf2vfp -------------------------===// 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#include "../assembly.h" 10 11// 12// extern float __truncdfsf2vfp(double a); 13// 14// Converts double precision float to single precision result. 15// Uses Darwin calling convention where a double precision parameter is 16// passed in a R0/R1 pair and a single precision result is returned in R0. 17// 18 .syntax unified 19 .p2align 2 20DEFINE_COMPILERRT_FUNCTION(__truncdfsf2vfp) 21#if defined(COMPILER_RT_ARMHF_TARGET) 22 vcvt.f32.f64 s0, d0 23#else 24 vmov d7, r0, r1 // load double from r0/r1 pair 25 vcvt.f32.f64 s15, d7 // convert double to single (trucate precision) 26 vmov r0, s15 // return result in r0 27#endif 28 bx lr 29END_COMPILERRT_FUNCTION(__truncdfsf2vfp) 30 31NO_EXEC_STACK_DIRECTIVE 32 33