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 21 DEFINE_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 26 END_COMPILERRT_FUNCTION(__extendsfdf2vfp) 27
