projects / rustc.git / blame
| Commit | Line | Data |
|---|---|---|
| 1a4d82fc JJ |
1 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 2 | // Source Licenses. See LICENSE.TXT for details. | |
| 3 | ||
| 4 | #include "../assembly.h" | |
| 5 | ||
| 6 | // long double __floatundixf(du_int a); | |
| 7 | ||
| 8 | #ifdef __x86_64__ | |
| 9 | ||
| 10 | CONST_SECTION | |
| 92a42be0 SL |
11 | |
| 12 | .balign 16 | |
| 13 | twop64: | |
| 14 | .quad 0x43f0000000000000 | |
| 1a4d82fc JJ |
15 | |
| 16 | #define REL_ADDR(_a) (_a)(%rip) | |
| 17 | ||
| 92a42be0 SL |
18 | .text |
| 19 | ||
| 20 | .balign 4 | |
| 1a4d82fc JJ |
21 | DEFINE_COMPILERRT_FUNCTION(__floatundixf) |
| 22 | movq %rdi, -8(%rsp) | |
| 23 | fildq -8(%rsp) | |
| 24 | test %rdi, %rdi | |
| 25 | js 1f | |
| 26 | ret | |
| 27 | 1: faddl REL_ADDR(twop64) | |
| 28 | ret | |
| 29 | END_COMPILERRT_FUNCTION(__floatundixf) | |
| 30 | ||
| 31 | #endif // __x86_64__ | |
| 32 | ||
| 33 | ||
| 34 | /* Branch-free implementation is ever so slightly slower, but more beautiful. | |
| 35 | It is likely superior for inlining, so I kept it around for future reference. | |
| 36 | ||
| 37 | #ifdef __x86_64__ | |
| 38 | ||
| 39 | CONST_SECTION | |
| 92a42be0 SL |
40 | |
| 41 | .balign 4 | |
| 42 | twop52: | |
| 43 | .quad 0x4330000000000000 | |
| 1a4d82fc | 44 | twop84_plus_twop52_neg: |
| 92a42be0 SL |
45 | .quad 0xc530000000100000 |
| 46 | twop84: | |
| 47 | .quad 0x4530000000000000 | |
| 1a4d82fc JJ |
48 | |
| 49 | #define REL_ADDR(_a) (_a)(%rip) | |
| 50 | ||
| 51 | .text | |
| 92a42be0 | 52 | .balign 4 |
| 1a4d82fc JJ |
53 | DEFINE_COMPILERRT_FUNCTION(__floatundixf) |
| 54 | movl %edi, %esi // low 32 bits of input | |
| 55 | shrq $32, %rdi // hi 32 bits of input | |
| 56 | orq REL_ADDR(twop84), %rdi // 2^84 + hi (as a double) | |
| 57 | orq REL_ADDR(twop52), %rsi // 2^52 + lo (as a double) | |
| 58 | movq %rdi, -8(%rsp) | |
| 59 | movq %rsi, -16(%rsp) | |
| 60 | fldl REL_ADDR(twop84_plus_twop52_neg) | |
| 61 | faddl -8(%rsp) // hi - 2^52 (as double extended, no rounding occurs) | |
| 62 | faddl -16(%rsp) // hi + lo (as double extended) | |
| 63 | ret | |
| 64 | END_COMPILERRT_FUNCTION(__floatundixf) | |
| 65 | ||
| 66 | #endif // __x86_64__ | |
| 67 | ||
| 68 | */ | |
| 3157f602 XL |
69 | |
| 70 | NO_EXEC_STACK_DIRECTIVE | |
| 71 |