1*3cab2bb3Spatrick//===-- floatundidf.S - Implement __floatundidf for i386 ------------------===// 2*3cab2bb3Spatrick// 3*3cab2bb3Spatrick// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*3cab2bb3Spatrick// See https://llvm.org/LICENSE.txt for license information. 5*3cab2bb3Spatrick// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*3cab2bb3Spatrick// 7*3cab2bb3Spatrick//===----------------------------------------------------------------------===// 8*3cab2bb3Spatrick// 9*3cab2bb3Spatrick// This file implements __floatundidf for the compiler_rt library. 10*3cab2bb3Spatrick// 11*3cab2bb3Spatrick//===----------------------------------------------------------------------===// 12*3cab2bb3Spatrick 13*3cab2bb3Spatrick#include "../assembly.h" 14*3cab2bb3Spatrick 15*3cab2bb3Spatrick// double __floatundidf(du_int a); 16*3cab2bb3Spatrick 17*3cab2bb3Spatrick#ifdef __i386__ 18*3cab2bb3Spatrick 19*3cab2bb3SpatrickCONST_SECTION 20*3cab2bb3Spatrick 21*3cab2bb3Spatrick .balign 16 22*3cab2bb3Spatricktwop52: 23*3cab2bb3Spatrick .quad 0x4330000000000000 24*3cab2bb3Spatrick 25*3cab2bb3Spatrick .balign 16 26*3cab2bb3Spatricktwop84_plus_twop52: 27*3cab2bb3Spatrick .quad 0x4530000000100000 28*3cab2bb3Spatrick 29*3cab2bb3Spatrick .balign 16 30*3cab2bb3Spatricktwop84: 31*3cab2bb3Spatrick .quad 0x4530000000000000 32*3cab2bb3Spatrick 33*3cab2bb3Spatrick#define REL_ADDR(_a) (_a)-0b(%eax) 34*3cab2bb3Spatrick 35*3cab2bb3Spatrick.text 36*3cab2bb3Spatrick.balign 4 37*3cab2bb3SpatrickDEFINE_COMPILERRT_FUNCTION(__floatundidf) 38*3cab2bb3Spatrick movss 8(%esp), %xmm1 // high 32 bits of a 39*3cab2bb3Spatrick movss 4(%esp), %xmm0 // low 32 bits of a 40*3cab2bb3Spatrick calll 0f 41*3cab2bb3Spatrick0: popl %eax 42*3cab2bb3Spatrick orpd REL_ADDR(twop84), %xmm1 // 0x1p84 + a_hi (no rounding occurs) 43*3cab2bb3Spatrick subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs) 44*3cab2bb3Spatrick orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs) 45*3cab2bb3Spatrick addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here) 46*3cab2bb3Spatrick movsd %xmm0, 4(%esp) 47*3cab2bb3Spatrick fldl 4(%esp) 48*3cab2bb3Spatrick ret 49*3cab2bb3SpatrickEND_COMPILERRT_FUNCTION(__floatundidf) 50*3cab2bb3Spatrick 51*3cab2bb3Spatrick#endif // __i386__ 52*3cab2bb3Spatrick 53*3cab2bb3SpatrickNO_EXEC_STACK_DIRECTIVE 54*3cab2bb3Spatrick 55