1 //===-- extendsfdf2vfp.S - Implement extendsfdf2vfp -----------------------===//
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-exception
7 //===----------------------------------------------------------------------===//
9 #include "../assembly.h"
12 // extern double __extendsfdf2vfp(float a);
14 // Converts single precision float to double precision result.
15 // Uses Darwin calling convention where a single precision parameter is
16 // passed in a GPR and a double precision result is returned in R0/R1 pair.
20 DEFINE_COMPILERRT_FUNCTION(__extendsfdf2vfp)
21 #if defined(COMPILER_RT_ARMHF_TARGET)
24 vmov s15, r0 // load float register from R0
25 vcvt.f64.f32 d7, s15 // convert single to double
26 vmov r0, r1, d7 // return result in r0/r1 pair
29 END_COMPILERRT_FUNCTION(__extendsfdf2vfp)
31 NO_EXEC_STACK_DIRECTIVE