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 CONST_SECTION 11 12 .balign 16 13 twop52: 14 .quad 0x4330000000000000 15 16 .balign 16 17 twop32: 18 .quad 0x41f0000000000000 19 20 #define REL_ADDR(_a) (_a)-0b(%eax) 21 22 .text 23 .balign 4 24 DEFINE_COMPILERRT_FUNCTION(__floatdidf) 25 cvtsi2sd 8(%esp), %xmm1 26 movss 4(%esp), %xmm0 // low 32 bits of a 27 calll 0f 28 0: popl %eax 29 mulsd REL_ADDR(twop32), %xmm1 // a_hi as a double (without rounding) 30 movsd REL_ADDR(twop52), %xmm2 // 0x1.0p52 31 subsd %xmm2, %xmm1 // a_hi - 0x1p52 (no rounding occurs) 32 orpd %xmm2, %xmm0 // 0x1p52 + a_lo (no rounding occurs) 33 addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) 34 movsd %xmm0, 4(%esp) 35 fldl 4(%esp) 36 ret 37 END_COMPILERRT_FUNCTION(__floatdidf) 38 39 #endif // __i386__ 40 41 NO_EXEC_STACK_DIRECTIVE 42 43
