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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-exception6//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 using15// the Darwin calling convention where double arguments are passsed in GPR pairs16//17 .syntax unified18 .p2align 219DEFINE_COMPILERRT_FUNCTION(__subdf3vfp)20#if defined(COMPILER_RT_ARMHF_TARGET)21 vsub.f64 d0, d0, d122#else23 VMOV_TO_DOUBLE(d6, r0, r1) // move first param from r0/r1 pair into d624 VMOV_TO_DOUBLE(d7, r2, r3) // move second param from r2/r3 pair into d725 vsub.f64 d6, d6, d726 VMOV_FROM_DOUBLE(r0, r1, d6) // move result back to r0/r1 pair27#endif28 bx lr29END_COMPILERRT_FUNCTION(__subdf3vfp)30 31NO_EXEC_STACK_DIRECTIVE32 33