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 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 vsub.f64 d6, d6, d7 26 vmov 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