[rustc.git] / src / compiler-rt / lib / builtins / arm / extendsfdf2vfp.S

//===-- extendsfdf2vfp.S - Implement extendsfdf2vfp -----------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "../assembly.h"

//
// extern double __extendsfdf2vfp(float a);
//
// Converts single precision float to double precision result.
// Uses Darwin calling convention where a single precision parameter is 
// passed in a GPR and a double precision result is returned in R0/R1 pair.
//
	.syntax unified
	.p2align 2
DEFINE_COMPILERRT_FUNCTION(__extendsfdf2vfp)
#if defined(COMPILER_RT_ARMHF_TARGET)
	vcvt.f64.f32 d0, s0
#else
	vmov	s15, r0      // load float register from R0
	vcvt.f64.f32 d7, s15 // convert single to double
	vmov	r0, r1, d7   // return result in r0/r1 pair
#endif
	bx	lr
END_COMPILERRT_FUNCTION(__extendsfdf2vfp)

NO_EXEC_STACK_DIRECTIVE
Commit	Line	Data
1a4d82fc JJ	1	//===-- extendsfdf2vfp.S - Implement extendsfdf2vfp -----------------------===//
	2	//
	3	// The LLVM Compiler Infrastructure
	4	//
	5	// This file is dual licensed under the MIT and the University of Illinois Open
	6	// Source Licenses. See LICENSE.TXT for details.
	7	//
	8	//===----------------------------------------------------------------------===//
	9
	10	#include "../assembly.h"
	11
	12	//
	13	// extern double __extendsfdf2vfp(float a);
	14	//
	15	// Converts single precision float to double precision result.
	16	// Uses Darwin calling convention where a single precision parameter is
	17	// passed in a GPR and a double precision result is returned in R0/R1 pair.
	18	//
	19	.syntax unified
92a42be0	20	.p2align 2
1a4d82fc	21	DEFINE_COMPILERRT_FUNCTION(__extendsfdf2vfp)
7cac9316 XL	22	#if defined(COMPILER_RT_ARMHF_TARGET)
	23	vcvt.f64.f32 d0, s0
	24	#else
1a4d82fc JJ	25	vmov s15, r0 // load float register from R0
	26	vcvt.f64.f32 d7, s15 // convert single to double
	27	vmov r0, r1, d7 // return result in r0/r1 pair
7cac9316	28	#endif
1a4d82fc JJ	29	bx lr
1a4d82fc JJ	30	END_COMPILERRT_FUNCTION(__extendsfdf2vfp)
3157f602 XL	31
	32	NO_EXEC_STACK_DIRECTIVE
	33