1// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 2// See https://llvm.org/LICENSE.txt for license information. 3// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 4 5#include "../assembly.h" 6 7// double __floatdidf(du_int a); 8 9#ifdef __i386__ 10 11CONST_SECTION 12 13 .balign 16 14twop52: 15 .quad 0x4330000000000000 16 17 .balign 16 18twop32: 19 .quad 0x41f0000000000000 20 21#define REL_ADDR(_a) (_a)-0b(%eax) 22 23.text 24.balign 4 25DEFINE_COMPILERRT_FUNCTION(__floatdidf) 26 cvtsi2sd 8(%esp), %xmm1 27 movss 4(%esp), %xmm0 // low 32 bits of a 28 calll 0f 290: popl %eax 30 mulsd REL_ADDR(twop32), %xmm1 // a_hi as a double (without rounding) 31 movsd REL_ADDR(twop52), %xmm2 // 0x1.0p52 32 subsd %xmm2, %xmm1 // a_hi - 0x1p52 (no rounding occurs) 33 orpd %xmm2, %xmm0 // 0x1p52 + a_lo (no rounding occurs) 34 addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) 35 movsd %xmm0, 4(%esp) 36 fldl 4(%esp) 37 ret 38END_COMPILERRT_FUNCTION(__floatdidf) 39 40#endif // __i386__ 41 42NO_EXEC_STACK_DIRECTIVE 43 44