1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Eclipse Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.eclipse.org/org/documents/epl-v10.html * 11* (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12* * 13* Information and Software Systems Research * 14* AT&T Research * 15* Florham Park NJ * 16* * 17* Glenn Fowler <gsf@research.att.com> * 18* David Korn <dgk@research.att.com> * 19* Phong Vo <kpv@research.att.com> * 20* * 21***********************************************************************/ 22#pragma prototyped 23/* 24 * Glenn Fowler 25 * AT&T Bell Laboratories 26 * 27 * generate align features 28 * 29 * NOTE: two's complement binary integral representation assumed 30 */ 31 32#include "FEATURE/common" 33 34#include <setjmp.h> 35 36union _u_ 37{ 38 long u1; 39 char* u2; 40 double u3; 41 char u4[1024]; 42 intmax_t u5; 43 uintmax_t u6; 44 _ast_fltmax_t u7; 45 void* u8; 46 char* (*u9)(); 47 jmp_buf u10; 48}; 49 50struct _s_ 51{ 52 char s1; 53 union _u_ s2; 54}; 55 56#define roundof(x,y) (((x)+((y)-1))&~((y)-1)) 57 58static union _u_ u; 59static union _u_ v; 60 61int 62main() 63{ 64 register int i; 65 register int j; 66 register int k; 67 68 int align0; 69 int align1; 70 int align2; 71 unsigned long bit1; 72 unsigned long bit2; 73 unsigned long bits0; 74 unsigned long bits1; 75 unsigned long bits2; 76 77 u.u2 = u.u4; 78 v.u2 = u.u2 + 1; 79 bit1 = u.u1 ^ v.u1; 80 v.u2 = u.u2 + 2; 81 bit2 = u.u1 ^ v.u1; 82 align0 = sizeof(struct _s_) - sizeof(union _u_); 83 bits0 = 0; 84 k = 0; 85 for (j = 0; j < align0; j++) 86 { 87 u.u2 = u.u4 + j; 88 bits1 = 0; 89 for (i = 0; i < align0; i++) 90 { 91 v.u2 = u.u2 + i; 92 bits1 |= u.u1 ^ v.u1; 93 } 94 if (!bits0 || bits1 < bits0) 95 { 96 bits0 = bits1; 97 k = j; 98 } 99 } 100 align1 = roundof(align0, 2); 101 u.u2 = u.u4 + k; 102 for (bits1 = bits0; i < align1; i++) 103 { 104 v.u2 = u.u2 + i; 105 bits1 |= u.u1 ^ v.u1; 106 } 107 align2 = roundof(align0, 4); 108 for (bits2 = bits1; i < align2; i++) 109 { 110 v.u2 = u.u2 + i; 111 bits2 |= u.u1 ^ v.u1; 112 } 113 printf("\n"); 114 printf("#define ALIGN_CHUNK %d\n", sizeof(char*) >= 4 ? 8192 : 1024); 115 printf("#define ALIGN_INTEGRAL uintptr_t\n"); 116 printf("#define ALIGN_INTEGER(x) ((char*)(x)-(char*)0)\n"); 117 printf("#define ALIGN_POINTER(x) ((char*)(x))\n"); 118 if (bits2 == (align2 - 1)) 119 printf("#define ALIGN_ROUND(x,y) ALIGN_POINTER(ALIGN_INTEGER((x)+(y)-1)&~((y)-1))\n"); 120 else 121 printf("#define ALIGN_ROUND(x,y) ALIGN_POINTER(ALIGN_INTEGER(ALIGN_ALIGN(x)+(((y)+%d)/%d)-1)&~((((y)+%d)/%d)-1))\n", align0, align0, align0, align0); 122 printf("\n"); 123 if (align0 == align2) 124 { 125 printf("#define ALIGN_BOUND ALIGN_BOUND2\n"); 126 printf("#define ALIGN_ALIGN(x) ALIGN_ALIGN2(x)\n"); 127 printf("#define ALIGN_TRUNC(x) ALIGN_TRUNC2(x)\n"); 128 } 129 else if (align0 == align1) 130 { 131 printf("#define ALIGN_BOUND ALIGN_BOUND1\n"); 132 printf("#define ALIGN_ALIGN(x) ALIGN_ALIGN1(x)\n"); 133 printf("#define ALIGN_TRUNC(x) ALIGN_TRUNC1(x)\n"); 134 } 135 else 136 { 137 printf("#define ALIGN_BOUND 1\n"); 138 printf("#define ALIGN_ALIGN(x) ALIGN_POINTER(x)\n"); 139 printf("#define ALIGN_TRUNC(x) ALIGN_POINTER(x)\n"); 140 } 141 printf("\n"); 142 printf("#define ALIGN_BIT1 0x%lx\n", bit1); 143 if (align1 == align2) 144 { 145 printf("#define ALIGN_BOUND1 ALIGN_BOUND2\n"); 146 printf("#define ALIGN_ALIGN1(x) ALIGN_ALIGN2(x)\n"); 147 printf("#define ALIGN_TRUNC1(x) ALIGN_TRUNC2(x)\n"); 148 } 149 else 150 { 151 printf("#define ALIGN_BOUND1 %d\n", align1); 152 printf("#define ALIGN_ALIGN1(x) ALIGN_TRUNC1((x)+%d)\n", align1 - 1); 153 printf("#define ALIGN_TRUNC1(x) ALIGN_POINTER(ALIGN_INTEGER((x)+%d)&0x%lx)\n", align1 - 1, ~(bits0|bits1)); 154 } 155#if _X86_ || _X64_ 156 printf("#if _X64_\n"); 157 printf("#define ALIGN_CLRBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0xfffffffffffffffeULL)\n"); 158 printf("#else\n"); 159 printf("#define ALIGN_CLRBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0xfffffffe)\n"); 160 printf("#endif\n"); 161#else 162 printf("#define ALIGN_CLRBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", ~bit1); 163#endif 164 printf("#define ALIGN_SETBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)|0x%lx)\n", bit1); 165 printf("#define ALIGN_TSTBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", bit1); 166 printf("\n"); 167 printf("#define ALIGN_BIT2 0x%lx\n", bit2); 168#if _X86_ || _X64_ 169 printf("#if _X64_\n"); 170 printf("#define ALIGN_BOUND2 16\n"); 171 printf("#define ALIGN_ALIGN2(x) ALIGN_TRUNC2((x)+15)\n"); 172 printf("#define ALIGN_TRUNC2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0xfffffffffffffffeULL)\n"); 173 printf("#else\n"); 174 printf("#define ALIGN_BOUND2 8\n"); 175 printf("#define ALIGN_ALIGN2(x) ALIGN_TRUNC2((x)+7)\n"); 176 printf("#define ALIGN_TRUNC2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0xfffffff8)\n"); 177 printf("#endif\n"); 178#else 179 printf("#define ALIGN_BOUND2 %d\n", align2); 180 printf("#define ALIGN_ALIGN2(x) ALIGN_TRUNC2((x)+%d)\n", align2 - 1); 181 printf("#define ALIGN_TRUNC2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", ~(bits0|bits1|bits2)); 182#endif 183 printf("#define ALIGN_CLRBIT2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", ~bit2); 184 printf("#define ALIGN_SETBIT2(x) ALIGN_POINTER(ALIGN_INTEGER(x)|0x%lx)\n", bit2); 185 printf("#define ALIGN_TSTBIT2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", bit2); 186 printf("\n"); 187 return 0; 188} 189