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// double __floatundidf(du_int a); 7 8#ifdef __i386__ 9 10#if defined(__APPLE__) 11 .const 12#elif defined(__ELF__) 13 .section .rodata 14#else 15 .section .rdata,"rd" 16#endif 17 18 .balign 16 19twop52: 20 .quad 0x4330000000000000 21 22 .balign 16 23twop32: 24 .quad 0x41f0000000000000 25 26#define REL_ADDR(_a) (_a)-0b(%eax) 27 28.text 29.balign 4 30DEFINE_COMPILERRT_FUNCTION(__floatdidf) 31 cvtsi2sd 8(%esp), %xmm1 32 movss 4(%esp), %xmm0 // low 32 bits of a 33 calll 0f 340: popl %eax 35 mulsd REL_ADDR(twop32), %xmm1 // a_hi as a double (without rounding) 36 movsd REL_ADDR(twop52), %xmm2 // 0x1.0p52 37 subsd %xmm2, %xmm1 // a_hi - 0x1p52 (no rounding occurs) 38 orpd %xmm2, %xmm0 // 0x1p52 + a_lo (no rounding occurs) 39 addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) 40 movsd %xmm0, 4(%esp) 41 fldl 4(%esp) 42 ret 43END_COMPILERRT_FUNCTION(__floatdidf) 44 45#endif // __i386__ 46