| Nick Kledzik | 0963c9e | 2009-09-14 23:26:56 +0000 | [diff] [blame] | 1 | //===-- truncdfsf2vfp.S - Implement truncdfsf2vfp -------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| Howard Hinnant | 9ad441f | 2010-11-16 22:13:33 +0000 | [diff] [blame] | 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| Nick Kledzik | 0963c9e | 2009-09-14 23:26:56 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| Daniel Dunbar | 19336a2 | 2009-10-27 17:49:50 +0000 | [diff] [blame] | 10 | #include "../assembly.h" |
| Nick Kledzik | 0963c9e | 2009-09-14 23:26:56 +0000 | [diff] [blame] | 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 | // |
| Bob Wilson | c20f862 | 2011-08-23 16:40:18 +0000 | [diff] [blame] | 19 | .syntax unified |
| Nick Kledzik | d016b38 | 2010-04-21 22:36:23 +0000 | [diff] [blame] | 20 | .align 2 |
| Daniel Dunbar | b4b1e8c | 2009-10-27 17:50:21 +0000 | [diff] [blame] | 21 | DEFINE_COMPILERRT_FUNCTION(__truncdfsf2vfp) |
| Bob Wilson | c20f862 | 2011-08-23 16:40:18 +0000 | [diff] [blame] | 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 |
| Nick Kledzik | 0963c9e | 2009-09-14 23:26:56 +0000 | [diff] [blame] | 25 | bx lr |