truncdfsf2vfp.S revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1//===-- truncdfsf2vfp.S - Implement truncdfsf2vfp -------------------------===//
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 float __truncdfsf2vfp(double a);
14//
15// Converts double precision float to signle precision result.
16// Uses Darwin calling convention where a double precision parameter is
17// passed in a R0/R1 pair and a signle precision result is returned in R0.
18//
19	.syntax unified
20	.p2align 2
21DEFINE_COMPILERRT_FUNCTION(__truncdfsf2vfp)
22	vmov 	d7, r0, r1   // load double from r0/r1 pair
23	vcvt.f32.f64 s15, d7 // convert double to single (trucate precision)
24	vmov 	r0, s15      // return result in r0
25	bx	lr
26END_COMPILERRT_FUNCTION(__truncdfsf2vfp)
27