1 //===-- extendsfdf2vfp.S - Implement extendsfdf2vfp -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "../assembly.h"
13 // extern double __extendsfdf2vfp(float a);
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.
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