1//===-- muldf3vfp.S - Implement muldf3vfp ---------------------------------===//
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 __muldf3vfp(double a, double b);
13//
14// Multiplies two double precision floating point numbers using the Darwin
15// calling convention where double arguments are passsed in GPR pairs
16//
17 .syntax unified
18 .p2align 2
19DEFINE_COMPILERRT_FUNCTION(__muldf3vfp)
20#if defined(COMPILER_RT_ARMHF_TARGET)
21 vmul.f64 d0, d0, d1
22#else
23 vmov d6, r0, r1 // move first param from r0/r1 pair into d6
24 vmov d7, r2, r3 // move second param from r2/r3 pair into d7
25 vmul.f64 d6, d6, d7
26 vmov r0, r1, d6 // move result back to r0/r1 pair
27#endif
28 bx lr
29END_COMPILERRT_FUNCTION(__muldf3vfp)
30
31NO_EXEC_STACK_DIRECTIVE
32
33

source code of compiler-rt/lib/builtins/arm/muldf3vfp.S