fixdfsivfp.S revision 314564 
1//===-- fixdfsivfp.S - Implement fixdfsivfp -----------------------===//
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 int __fixdfsivfp(double a);
14//
15// Converts double precision float to a 32-bit int rounding towards zero.
16// Uses Darwin calling convention where a double precision parameter is
17// passed in GPR register pair.
18//
19	.syntax unified
20	.p2align 2
21DEFINE_COMPILERRT_FUNCTION(__fixdfsivfp)
22#if defined(COMPILER_RT_ARMHF_TARGET)
23	vcvt.s32.f64 s0, d0
24	vmov r0, s0
25#else
26	vmov	d7, r0, r1    // load double register from R0/R1
27	vcvt.s32.f64 s15, d7  // convert double to 32-bit int into s15
28	vmov	r0, s15	      // move s15 to result register
29#endif
30	bx	lr
31END_COMPILERRT_FUNCTION(__fixdfsivfp)
32
33NO_EXEC_STACK_DIRECTIVE
34
35