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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-exception6//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 is16// passed in a R0/R1 pair and a single precision result is returned in R0.17//18 .syntax unified19 .p2align 220DEFINE_COMPILERRT_FUNCTION(__truncdfsf2vfp)21#if defined(COMPILER_RT_ARMHF_TARGET)22 vcvt.f32.f64 s0, d023#else24 VMOV_TO_DOUBLE(d7, r0, r1) // load double from r0/r1 pair25 vcvt.f32.f64 s15, d7 // convert double to single (trucate precision)26 vmov r0, s15 // return result in r027#endif28 bx lr29END_COMPILERRT_FUNCTION(__truncdfsf2vfp)30 31NO_EXEC_STACK_DIRECTIVE32 33