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//===-- subdf3vfp.S - Implement subdf3vfp ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
//
// extern double __subdf3vfp(double a, double b);
//
// Returns difference between two double precision floating point numbers using
// the Darwin calling convention where double arguments are passsed in GPR pairs
//
.syntax unified
.p2align 2
DEFINE_COMPILERRT_FUNCTION(__subdf3vfp)
#if defined(COMPILER_RT_ARMHF_TARGET)
vsub.f64 d0, d0, d1
#else
VMOV_TO_DOUBLE(d6, r0, r1) // move first param from r0/r1 pair into d6
VMOV_TO_DOUBLE(d7, r2, r3) // move second param from r2/r3 pair into d7
vsub.f64 d6, d6, d7
VMOV_FROM_DOUBLE(r0, r1, d6) // move result back to r0/r1 pair
#endif
bx lr
END_COMPILERRT_FUNCTION(__subdf3vfp)
NO_EXEC_STACK_DIRECTIVE
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