1 1.1 mrg /* 2 1.1.1.2 mrg * Copyright (C) 1997-2024 Free Software Foundation, Inc. 3 1.1 mrg * 4 1.1 mrg * This file is free software; you can redistribute it and/or modify it 5 1.1 mrg * under the terms of the GNU General Public License as published by the 6 1.1 mrg * Free Software Foundation; either version 3, or (at your option) any 7 1.1 mrg * later version. 8 1.1 mrg * 9 1.1 mrg * This file is distributed in the hope that it will be useful, but 10 1.1 mrg * WITHOUT ANY WARRANTY; without even the implied warranty of 11 1.1 mrg * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 1.1 mrg * General Public License for more details. 13 1.1 mrg * 14 1.1 mrg * Under Section 7 of GPL version 3, you are granted additional 15 1.1 mrg * permissions described in the GCC Runtime Library Exception, version 16 1.1 mrg * 3.1, as published by the Free Software Foundation. 17 1.1 mrg * 18 1.1 mrg * You should have received a copy of the GNU General Public License and 19 1.1 mrg * a copy of the GCC Runtime Library Exception along with this program; 20 1.1 mrg * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 21 1.1 mrg * <http://www.gnu.org/licenses/>. 22 1.1 mrg */ 23 1.1 mrg 24 1.1 mrg 25 1.1 mrg #include "sfp-machine.h" 26 1.1 mrg 27 1.1 mrg #define HUGE_VAL (__builtin_huge_val ()) 28 1.1 mrg 29 1.1 mrg /* Please see section 10, 30 1.1 mrg page 10-5 "Delayed Trapping" in the PA-RISC 2.0 Architecture manual */ 31 1.1 mrg 32 1.1 mrg void 33 1.1 mrg __sfp_handle_exceptions (int _fex) 34 1.1 mrg { 35 1.1 mrg /* Raise exceptions represented by _FEX. But we must raise only one 36 1.1 mrg signal at a time. It is important that if the overflow/underflow 37 1.1 mrg exception and the divide by zero exception are given at the same 38 1.1 mrg time, the overflow/underflow exception follows the divide by zero 39 1.1 mrg exception. */ 40 1.1 mrg 41 1.1 mrg /* We do these bits in assembly to be certain GCC doesn't optimize 42 1.1 mrg away something important, and so we can force delayed traps to 43 1.1 mrg occur. */ 44 1.1 mrg 45 1.1 mrg /* We use "fldd 0(%%sr0,%%sp),%0" to flush the delayed exception */ 46 1.1 mrg 47 1.1 mrg /* First: Invalid exception. */ 48 1.1 mrg if (_fex & FP_EX_INVALID) 49 1.1 mrg { 50 1.1 mrg /* One example of an invalid operation is 0 * Infinity. */ 51 1.1 mrg double d = HUGE_VAL; 52 1.1 mrg __asm__ __volatile__ ( 53 1.1 mrg " fcpy,dbl %%fr0,%%fr22\n" 54 1.1 mrg " fmpy,dbl %0,%%fr22,%0\n" 55 1.1 mrg " fldd 0(%%sr0,%%sp),%0" 56 1.1 mrg : "+f" (d) : : "%fr22" ); 57 1.1 mrg } 58 1.1 mrg 59 1.1 mrg /* Second: Division by zero. */ 60 1.1 mrg if (_fex & FP_EX_DIVZERO) 61 1.1 mrg { 62 1.1 mrg double d = 1.0; 63 1.1 mrg __asm__ __volatile__ ( 64 1.1 mrg " fcpy,dbl %%fr0,%%fr22\n" 65 1.1 mrg " fdiv,dbl %0,%%fr22,%0\n" 66 1.1 mrg " fldd 0(%%sr0,%%sp),%0" 67 1.1 mrg : "+f" (d) : : "%fr22" ); 68 1.1 mrg } 69 1.1 mrg 70 1.1 mrg /* Third: Overflow. */ 71 1.1 mrg if (_fex & FP_EX_OVERFLOW) 72 1.1 mrg { 73 1.1 mrg double d = __DBL_MAX__; 74 1.1 mrg __asm__ __volatile__ ( 75 1.1 mrg " fadd,dbl %0,%0,%0\n" 76 1.1 mrg " fldd 0(%%sr0,%%sp),%0" 77 1.1 mrg : "+f" (d) ); 78 1.1 mrg } 79 1.1 mrg 80 1.1 mrg /* Fourth: Underflow. */ 81 1.1 mrg if (_fex & FP_EX_UNDERFLOW) 82 1.1 mrg { 83 1.1 mrg double d = __DBL_MIN__; 84 1.1 mrg double e = 3.0; 85 1.1 mrg __asm__ __volatile__ ( 86 1.1 mrg " fdiv,dbl %0,%1,%0\n" 87 1.1 mrg " fldd 0(%%sr0,%%sp),%0" 88 1.1 mrg : "+f" (d) : "f" (e) ); 89 1.1 mrg } 90 1.1 mrg 91 1.1 mrg /* Fifth: Inexact */ 92 1.1 mrg if (_fex & FP_EX_INEXACT) 93 1.1 mrg { 94 1.1 mrg double d = 3.14159265358979323846; 95 1.1 mrg double e = 69.69; 96 1.1 mrg __asm__ __volatile__ ( 97 1.1 mrg " fdiv,dbl %0,%1,%%fr22\n" 98 1.1 mrg " fcnvfxt,dbl,sgl %%fr22,%%fr22L\n" 99 1.1 mrg " fldd 0(%%sr0,%%sp),%%fr22" 100 1.1 mrg : : "f" (d), "f" (e) : "%fr22" ); 101 1.1 mrg } 102 1.1 mrg } 103
Indexes created Sat Feb 28 05:31:39 UTC 2026