1 //===-- floatundidf.S - Implement __floatundidf for x86_64 ----------------===// 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 __x86_64__ 19 20 CONST_SECTION 21 22 .balign 16 23 twop52: 24 .quad 0x4330000000000000 25 26 .balign 16 27 twop84_plus_twop52: 28 .quad 0x4530000000100000 29 30 .balign 16 31 twop84: 32 .quad 0x4530000000000000 33 34 #define REL_ADDR(_a) (_a)(%rip) 35 36 .text 37 .balign 4 38 DEFINE_COMPILERRT_FUNCTION(__floatundidf) 39 movd %edi, %xmm0 // low 32 bits of a 40 shrq $32, %rdi // high 32 bits of a 41 orq REL_ADDR(twop84), %rdi // 0x1p84 + a_hi (no rounding occurs) 42 orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs) 43 movd %rdi, %xmm1 44 subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs) 45 addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) 46 ret 47 END_COMPILERRT_FUNCTION(__floatundidf) 48 49 #endif // __x86_64__ 50
