| 1 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 2 | // See https://llvm.org/LICENSE.txt for license information. |
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| 3 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 4 | |
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| 5 | #include "../assembly.h" |
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| 6 | |
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| 7 | // xf_float __floatundixf(du_int a); |
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| 8 | |
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| 9 | #ifdef __x86_64__ |
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| 10 | |
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| 11 | CONST_SECTION |
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| 12 | |
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| 13 | .balign 16 |
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| 14 | twop64: |
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| 15 | .quad 0x43f0000000000000 |
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| 16 | |
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| 17 | #define REL_ADDR(_a) (_a)(%rip) |
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| 18 | |
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| 19 | .text |
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| 20 | |
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| 21 | .balign 4 |
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| 22 | DEFINE_COMPILERRT_FUNCTION(__floatundixf) |
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| 23 | movq %rdi, -8(%rsp) |
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| 24 | fildq -8(%rsp) |
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| 25 | test %rdi, %rdi |
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| 26 | js 1f |
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| 27 | ret |
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| 28 | 1: faddl REL_ADDR(twop64) |
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| 29 | ret |
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| 30 | END_COMPILERRT_FUNCTION(__floatundixf) |
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| 31 | |
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| 32 | #endif // __x86_64__ |
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| 33 | |
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| 34 | |
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| 35 | /* Branch-free implementation is ever so slightly slower, but more beautiful. |
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| 36 | It is likely superior for inlining, so I kept it around for future reference. |
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| 37 | |
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| 38 | #ifdef __x86_64__ |
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| 39 | |
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| 40 | CONST_SECTION |
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| 41 | |
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| 42 | .balign 4 |
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| 43 | twop52: |
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| 44 | .quad 0x4330000000000000 |
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| 45 | twop84_plus_twop52_neg: |
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| 46 | .quad 0xc530000000100000 |
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| 47 | twop84: |
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| 48 | .quad 0x4530000000000000 |
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| 49 | |
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| 50 | #define REL_ADDR(_a) (_a)(%rip) |
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| 51 | |
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| 52 | .text |
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| 53 | .balign 4 |
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| 54 | DEFINE_COMPILERRT_FUNCTION(__floatundixf) |
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| 55 | movl %edi, %esi // low 32 bits of input |
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| 56 | shrq $32, %rdi // hi 32 bits of input |
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| 57 | orq REL_ADDR(twop84), %rdi // 2^84 + hi (as a double) |
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| 58 | orq REL_ADDR(twop52), %rsi // 2^52 + lo (as a double) |
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| 59 | movq %rdi, -8(%rsp) |
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| 60 | movq %rsi, -16(%rsp) |
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| 61 | fldl REL_ADDR(twop84_plus_twop52_neg) |
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| 62 | faddl -8(%rsp) // hi - 2^52 (as double extended, no rounding occurs) |
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| 63 | faddl -16(%rsp) // hi + lo (as double extended) |
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| 64 | ret |
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| 65 | END_COMPILERRT_FUNCTION(__floatundixf) |
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| 66 | |
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| 67 | #endif // __x86_64__ |
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| 68 | |
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| 69 | */ |
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| 70 | |
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| 71 | NO_EXEC_STACK_DIRECTIVE |
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| 72 | |
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| 73 | |
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