1 //===-- floatundidf.S - Implement __floatundidf for i386 ------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements __floatundidf for the compiler_rt library. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "../assembly.h" 15 16 // double __floatundidf(du_int a); 17 18 #ifdef __i386__ 19 20 #ifndef __ELF__ 21 .const 22 #endif 23 .align 4 24 twop52: .quad 0x4330000000000000 25 twop84_plus_twop52: 26 .quad 0x4530000000100000 27 twop84: .quad 0x4530000000000000 28 29 #define REL_ADDR(_a) (_a)-0b(%eax) 30 31 .text 32 .align 4 33 DEFINE_COMPILERRT_FUNCTION(__floatundidf) 34 movss 8(%esp), %xmm1 // high 32 bits of a 35 movss 4(%esp), %xmm0 // low 32 bits of a 36 calll 0f 37 0: popl %eax 38 orpd REL_ADDR(twop84), %xmm1 // 0x1p84 + a_hi (no rounding occurs) 39 subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs) 40 orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs) 41 addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) 42 movsd %xmm0, 4(%esp) 43 fldl 4(%esp) 44 ret 45 46 #endif // __i386__ 47
