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

//===-- fixdfsivfp.S - Implement fixdfsivfp -----------------------===//
//
// 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 int __fixdfsivfp(double a);
//
// Converts double precision float to a 32-bit int rounding towards zero.
// Uses Darwin calling convention where a double precision parameter is
// passed in GPR register pair.
//
	.syntax unified
	.p2align 2
DEFINE_COMPILERRT_FUNCTION(__fixdfsivfp)
#if defined(COMPILER_RT_ARMHF_TARGET)
	vcvt.s32.f64 s0, d0
	vmov r0, s0
#else
	vmov	d7, r0, r1    // load double register from R0/R1
	vcvt.s32.f64 s15, d7  // convert double to 32-bit int into s15
	vmov	r0, s15	      // move s15 to result register
#endif
	bx	lr
END_COMPILERRT_FUNCTION(__fixdfsivfp)

NO_EXEC_STACK_DIRECTIVE