1//===-- floatundidf.S - Implement __floatundidf for x86_64 ----------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file implements __floatundidf for the compiler_rt library. 10// 11//===----------------------------------------------------------------------===// 12 13#include "../assembly.h" 14 15// double __floatundidf(du_int a); 16 17#ifdef __x86_64__ 18 19CONST_SECTION 20 21 .balign 16 22twop52: 23 .quad 0x4330000000000000 24 25 .balign 16 26twop84_plus_twop52: 27 .quad 0x4530000000100000 28 29 .balign 16 30twop84: 31 .quad 0x4530000000000000 32 33#define REL_ADDR(_a) (_a)(%rip) 34 35.text 36.balign 4 37DEFINE_COMPILERRT_FUNCTION(__floatundidf) 38 movd %edi, %xmm0 // low 32 bits of a 39 shrq $32, %rdi // high 32 bits of a 40 orq REL_ADDR(twop84), %rdi // 0x1p84 + a_hi (no rounding occurs) 41 orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs) 42 movd %rdi, %xmm1 43 subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs) 44 addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) 45 ret 46END_COMPILERRT_FUNCTION(__floatundidf) 47 48#endif // __x86_64__ 49 50NO_EXEC_STACK_DIRECTIVE 51 52