1276789Sdim//===-- floatundidf.S - Implement __floatundidf for x86_64 ----------------===// 2276789Sdim// 3276789Sdim// The LLVM Compiler Infrastructure 4276789Sdim// 5276789Sdim// This file is dual licensed under the MIT and the University of Illinois Open 6276789Sdim// Source Licenses. See LICENSE.TXT for details. 7276789Sdim// 8276789Sdim//===----------------------------------------------------------------------===// 9276789Sdim// 10276789Sdim// This file implements __floatundidf for the compiler_rt library. 11276789Sdim// 12276789Sdim//===----------------------------------------------------------------------===// 13276789Sdim 14276789Sdim#include "../assembly.h" 15276789Sdim 16276789Sdim// double __floatundidf(du_int a); 17276789Sdim 18276789Sdim#ifdef __x86_64__ 19276789Sdim 20276789SdimCONST_SECTION 21276789Sdim 22276789Sdim .balign 16 23276789Sdimtwop52: 24276789Sdim .quad 0x4330000000000000 25276789Sdim 26276789Sdim .balign 16 27276789Sdimtwop84_plus_twop52: 28276789Sdim .quad 0x4530000000100000 29276789Sdim 30276789Sdim .balign 16 31276789Sdimtwop84: 32276789Sdim .quad 0x4530000000000000 33276789Sdim 34276789Sdim#define REL_ADDR(_a) (_a)(%rip) 35276789Sdim 36276789Sdim.text 37276789Sdim.balign 4 38276789SdimDEFINE_COMPILERRT_FUNCTION(__floatundidf) 39276789Sdim movd %edi, %xmm0 // low 32 bits of a 40276789Sdim shrq $32, %rdi // high 32 bits of a 41276789Sdim orq REL_ADDR(twop84), %rdi // 0x1p84 + a_hi (no rounding occurs) 42276789Sdim orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs) 43276789Sdim movd %rdi, %xmm1 44276789Sdim subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs) 45276789Sdim addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) 46276789Sdim ret 47276789SdimEND_COMPILERRT_FUNCTION(__floatundidf) 48276789Sdim 49276789Sdim#endif // __x86_64__ 50