| 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 | // double __floatdidf(du_int a); |
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| 8 | |
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| 9 | #ifdef __i386__ |
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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 | twop52: |
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| 15 | .quad 0x4330000000000000 |
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| 16 | |
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| 17 | .balign 16 |
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| 18 | twop32: |
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| 19 | .quad 0x41f0000000000000 |
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| 20 | |
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| 21 | #define REL_ADDR(_a) (_a)-0b(%eax) |
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| 22 | |
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| 23 | .text |
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| 24 | .balign 4 |
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| 25 | DEFINE_COMPILERRT_FUNCTION(__floatdidf) |
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| 26 | cvtsi2sd 8(%esp), %xmm1 |
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| 27 | movss 4(%esp), %xmm0 // low 32 bits of a |
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| 28 | calll 0f |
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| 29 | 0: popl %eax |
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| 30 | mulsd REL_ADDR(twop32), %xmm1 // a_hi as a double (without rounding) |
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| 31 | movsd REL_ADDR(twop52), %xmm2 // 0x1.0p52 |
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| 32 | subsd %xmm2, %xmm1 // a_hi - 0x1p52 (no rounding occurs) |
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| 33 | orpd %xmm2, %xmm0 // 0x1p52 + a_lo (no rounding occurs) |
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| 34 | addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) |
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| 35 | movsd %xmm0, 4(%esp) |
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| 36 | fldl 4(%esp) |
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| 37 | ret |
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| 38 | END_COMPILERRT_FUNCTION(__floatdidf) |
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| 39 | |
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| 40 | #endif // __i386__ |
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| 41 | |
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| 42 | NO_EXEC_STACK_DIRECTIVE |
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| 43 | |
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| 44 | |
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