1//===-- extendsfdf2vfp.S - Implement extendsfdf2vfp -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#include "../assembly.h" 11 12// 13// extern double __extendsfdf2vfp(float a); 14// 15// Converts single precision float to double precision result. 16// Uses Darwin calling convention where a single precision parameter is 17// passed in a GPR and a double precision result is returned in R0/R1 pair. 18// 19 .syntax unified 20 .p2align 2 21DEFINE_COMPILERRT_FUNCTION(__extendsfdf2vfp) 22 vmov s15, r0 // load float register from R0 23 vcvt.f64.f32 d7, s15 // convert single to double 24 vmov r0, r1, d7 // return result in r0/r1 pair 25 bx lr 26END_COMPILERRT_FUNCTION(__extendsfdf2vfp) 27 28NO_EXEC_STACK_DIRECTIVE 29 30