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#if defined(COMPILER_RT_ARMHF_TARGET)
23	vcvt.f64.f32 d0, s0
24#else
25	vmov	s15, r0      // load float register from R0
26	vcvt.f64.f32 d7, s15 // convert single to double
27	vmov	r0, r1, d7   // return result in r0/r1 pair
28#endif
29	bx	lr
30END_COMPILERRT_FUNCTION(__extendsfdf2vfp)
31
32NO_EXEC_STACK_DIRECTIVE
33
34