1//===-- floatunssidfvfp.S - Implement floatunssidfvfp ---------------------===//
2//
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
6//
7//===----------------------------------------------------------------------===//
8
9#include "../assembly.h"
10
11//
12// extern double __floatunssidfvfp(unsigned int a);
13//
14// Converts a 32-bit int to a double precision float.
15// Uses Darwin calling convention where a double precision result is
16// return in GPR register pair.
17//
18 .syntax unified
19 .p2align 2
20DEFINE_COMPILERRT_FUNCTION(__floatunssidfvfp)
21#if defined(COMPILER_RT_ARMHF_TARGET)
22 vmov s0, r0
23 vcvt.f64.u32 d0, s0
24#else
25 vmov s15, r0 // move int to float register s15
26 vcvt.f64.u32 d7, s15 // convert 32-bit int in s15 to double in d7
27 vmov r0, r1, d7 // move d7 to result register pair r0/r1
28#endif
29 bx lr
30END_COMPILERRT_FUNCTION(__floatunssidfvfp)
31
32NO_EXEC_STACK_DIRECTIVE
33
34

source code of compiler-rt/lib/builtins/arm/floatunssidfvfp.S