Daniel Dunbar | 51c80cc | 2009-10-27 17:49:19 +0000 | [diff] [blame] | 1 | //===-- floatundidf.S - Implement __floatundidf for x86_64 ----------------===// |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 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. |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements __floatundidf for the compiler_rt library. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
Daniel Dunbar | 19336a2 | 2009-10-27 17:49:50 +0000 | [diff] [blame] | 14 | #include "../assembly.h" |
| 15 | |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 16 | // double __floatundidf(du_int a); |
| 17 | |
| 18 | #ifdef __x86_64__ |
| 19 | |
Edward O'Callaghan | eed1300 | 2009-11-04 23:52:51 +0000 | [diff] [blame] | 20 | #ifndef __ELF__ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 21 | .const |
Edward O'Callaghan | eed1300 | 2009-11-04 23:52:51 +0000 | [diff] [blame] | 22 | #endif |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 23 | .align 4 |
| 24 | twop52: .quad 0x4330000000000000 |
| 25 | twop84_plus_twop52: |
| 26 | .quad 0x4530000000100000 |
| 27 | twop84: .quad 0x4530000000000000 |
| 28 | |
| 29 | #define REL_ADDR(_a) (_a)(%rip) |
| 30 | |
| 31 | .text |
| 32 | .align 4 |
Daniel Dunbar | b4b1e8c | 2009-10-27 17:50:21 +0000 | [diff] [blame] | 33 | DEFINE_COMPILERRT_FUNCTION(__floatundidf) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 34 | movd %edi, %xmm0 // low 32 bits of a |
| 35 | shrq $32, %rdi // high 32 bits of a |
| 36 | orq REL_ADDR(twop84), %rdi // 0x1p84 + a_hi (no rounding occurs) |
| 37 | orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs) |
| 38 | movd %rdi, %xmm1 |
| 39 | subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs) |
| 40 | addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) |
| 41 | ret |
| 42 | |
Edward O'Callaghan | eed1300 | 2009-11-04 23:52:51 +0000 | [diff] [blame] | 43 | #endif // __x86_64__ |