1//===-- subdf3vfp.S - Implement subdf3vfp ---------------------------------===//
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 __subdf3vfp(double a, double b);
13//
14// Returns difference between two double precision floating point numbers using
15// the Darwin calling convention where double arguments are passsed in GPR pairs
16//
17 .syntax unified
18 .p2align 2
19DEFINE_COMPILERRT_FUNCTION(__subdf3vfp)
20#if defined(COMPILER_RT_ARMHF_TARGET)
21 vsub.f64 d0, d0, d1
22#else
23 VMOV_TO_DOUBLE(d6, r0, r1) // move first param from r0/r1 pair into d6
24 VMOV_TO_DOUBLE(d7, r2, r3) // move second param from r2/r3 pair into d7
25 vsub.f64 d6, d6, d7
26 VMOV_FROM_DOUBLE(r0, r1, d6) // move result back to r0/r1 pair
27#endif
28 bx lr
29END_COMPILERRT_FUNCTION(__subdf3vfp)
30
31NO_EXEC_STACK_DIRECTIVE
32
33

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source code of compiler-rt/lib/builtins/arm/subdf3vfp.S