llvm/compiler-rt/lib/builtins/arm/subsf3vfp.S

//===-- subsf3vfp.S - Implement subsf3vfp ---------------------------------===//
//
// 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 float __subsf3vfp(float a, float b);
//
// Returns the difference between two single precision floating point numbers
// using the Darwin calling convention where single arguments are passsed
// like 32-bit ints.
//
	.syntax unified
	.p2align 2
DEFINE_COMPILERRT_FUNCTION(__subsf3vfp)
#if defined(COMPILER_RT_ARMHF_TARGET)
	vsub.f32 s0, s0, s1
#else
	vmov	s14, r0		// move first param from r0 into float register
	vmov	s15, r1		// move second param from r1 into float register
	vsub.f32 s14, s14, s15
	vmov	r0, s14		// move result back to r0
#endif
	bx	lr
END_COMPILERRT_FUNCTION(__subsf3vfp)

NO_EXEC_STACK_DIRECTIVE