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1//===-- extendsfdf2vfp.S - Implement extendsfdf2vfp -----------------------===//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 double __extendsfdf2vfp(float a);13//14// Converts single precision float to double precision result.15// Uses Darwin calling convention where a single precision parameter is16// passed in a GPR and a double precision result is returned in R0/R1 pair.17//18 .syntax unified19 .p2align 220DEFINE_COMPILERRT_FUNCTION(__extendsfdf2vfp)21#if defined(COMPILER_RT_ARMHF_TARGET)22 vcvt.f64.f32 d0, s023#else24 vmov s15, r0 // load float register from R025 vcvt.f64.f32 d7, s15 // convert single to double26 VMOV_FROM_DOUBLE(r0, r1, d7) // return result in r0/r1 pair27#endif28 bx lr29END_COMPILERRT_FUNCTION(__extendsfdf2vfp)30 31NO_EXEC_STACK_DIRECTIVE32 33