| 1 | /* Helper macros for x86 libm functions. |
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| 2 | Copyright (C) 2015-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _I386_MATH_ASM_H |
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| 20 | #define _I386_MATH_ASM_H 1 |
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| 21 | |
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| 22 | /* Remove excess range and precision by storing a value on the stack |
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| 23 | and loading it back. */ |
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| 24 | #define FLT_NARROW_EVAL \ |
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| 25 | subl $4, %esp; \ |
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| 26 | cfi_adjust_cfa_offset (4); \ |
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| 27 | fstps (%esp); \ |
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| 28 | flds (%esp); \ |
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| 29 | addl $4, %esp; \ |
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| 30 | cfi_adjust_cfa_offset (-4); |
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| 31 | #define DBL_NARROW_EVAL \ |
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| 32 | subl $8, %esp; \ |
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| 33 | cfi_adjust_cfa_offset (8); \ |
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| 34 | fstpl (%esp); \ |
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| 35 | fldl (%esp); \ |
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| 36 | addl $8, %esp; \ |
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| 37 | cfi_adjust_cfa_offset (-8); |
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| 38 | |
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| 39 | /* Define constants for the minimum value of a floating-point |
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| 40 | type. */ |
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| 41 | #define DEFINE_FLT_MIN \ |
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| 42 | .section .rodata.cst4,"aM",@progbits,4; \ |
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| 43 | .p2align 2; \ |
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| 44 | .type flt_min,@object; \ |
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| 45 | flt_min: \ |
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| 46 | .byte 0, 0, 0x80, 0; \ |
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| 47 | .size flt_min, .-flt_min; |
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| 48 | #define DEFINE_DBL_MIN \ |
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| 49 | .section .rodata.cst8,"aM",@progbits,8; \ |
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| 50 | .p2align 3; \ |
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| 51 | .type dbl_min,@object; \ |
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| 52 | dbl_min: \ |
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| 53 | .byte 0, 0, 0, 0, 0, 0, 0x10, 0; \ |
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| 54 | .size dbl_min, .-dbl_min; |
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| 55 | #define DEFINE_LDBL_MIN \ |
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| 56 | .section .rodata.cst16,"aM",@progbits,16; \ |
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| 57 | .p2align 4; \ |
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| 58 | .type ldbl_min,@object; \ |
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| 59 | ldbl_min: \ |
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| 60 | .byte 0, 0, 0, 0, 0, 0, 0, 0x80, 0x1, 0; \ |
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| 61 | .byte 0, 0, 0, 0, 0, 0; \ |
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| 62 | .size ldbl_min, .-ldbl_min; |
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| 63 | |
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| 64 | /* Remove excess range and precision by storing a value on the stack |
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| 65 | and loading it back. The value is given to be nonnegative or NaN; |
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| 66 | if it is subnormal, also force an underflow exception. The |
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| 67 | relevant constant for the minimum of the type must have been |
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| 68 | defined, the MO macro must have been defined for access to memory |
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| 69 | operands, and, if PIC, the PIC register must have been loaded. */ |
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| 70 | #define FLT_NARROW_EVAL_UFLOW_NONNEG_NAN \ |
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| 71 | subl $4, %esp; \ |
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| 72 | cfi_adjust_cfa_offset (4); \ |
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| 73 | flds MO(flt_min); \ |
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| 74 | fld %st(1); \ |
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| 75 | fucompp; \ |
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| 76 | fnstsw; \ |
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| 77 | sahf; \ |
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| 78 | jnc 6424f; \ |
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| 79 | fld %st(0); \ |
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| 80 | fmul %st(0); \ |
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| 81 | fstps (%esp); \ |
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| 82 | 6424: fstps (%esp); \ |
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| 83 | flds (%esp); \ |
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| 84 | addl $4, %esp; \ |
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| 85 | cfi_adjust_cfa_offset (-4); |
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| 86 | #define DBL_NARROW_EVAL_UFLOW_NONNEG_NAN \ |
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| 87 | subl $8, %esp; \ |
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| 88 | cfi_adjust_cfa_offset (8); \ |
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| 89 | fldl MO(dbl_min); \ |
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| 90 | fld %st(1); \ |
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| 91 | fucompp; \ |
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| 92 | fnstsw; \ |
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| 93 | sahf; \ |
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| 94 | jnc 6453f; \ |
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| 95 | fld %st(0); \ |
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| 96 | fmul %st(0); \ |
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| 97 | fstpl (%esp); \ |
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| 98 | 6453: fstpl (%esp); \ |
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| 99 | fldl (%esp); \ |
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| 100 | addl $8, %esp; \ |
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| 101 | cfi_adjust_cfa_offset (-8); |
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| 102 | |
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| 103 | /* Likewise, but the argument is not a NaN (so fcom instructions, |
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| 104 | which support memory operands, can be used). */ |
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| 105 | #define FLT_NARROW_EVAL_UFLOW_NONNEG \ |
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| 106 | subl $4, %esp; \ |
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| 107 | cfi_adjust_cfa_offset (4); \ |
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| 108 | fcoms MO(flt_min); \ |
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| 109 | fnstsw; \ |
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| 110 | sahf; \ |
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| 111 | jnc 6424f; \ |
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| 112 | fld %st(0); \ |
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| 113 | fmul %st(0); \ |
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| 114 | fstps (%esp); \ |
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| 115 | 6424: fstps (%esp); \ |
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| 116 | flds (%esp); \ |
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| 117 | addl $4, %esp; \ |
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| 118 | cfi_adjust_cfa_offset (-4); |
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| 119 | #define DBL_NARROW_EVAL_UFLOW_NONNEG \ |
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| 120 | subl $8, %esp; \ |
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| 121 | cfi_adjust_cfa_offset (8); \ |
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| 122 | fcoml MO(dbl_min); \ |
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| 123 | fnstsw; \ |
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| 124 | sahf; \ |
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| 125 | jnc 6453f; \ |
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| 126 | fld %st(0); \ |
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| 127 | fmul %st(0); \ |
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| 128 | fstpl (%esp); \ |
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| 129 | 6453: fstpl (%esp); \ |
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| 130 | fldl (%esp); \ |
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| 131 | addl $8, %esp; \ |
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| 132 | cfi_adjust_cfa_offset (-8); |
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| 133 | |
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| 134 | /* Likewise, but the non-NaN argument may be negative. */ |
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| 135 | #define FLT_NARROW_EVAL_UFLOW_NONNAN \ |
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| 136 | subl $4, %esp; \ |
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| 137 | cfi_adjust_cfa_offset (4); \ |
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| 138 | fld %st(0); \ |
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| 139 | fabs; \ |
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| 140 | fcomps MO(flt_min); \ |
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| 141 | fnstsw; \ |
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| 142 | sahf; \ |
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| 143 | jnc 6424f; \ |
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| 144 | fld %st(0); \ |
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| 145 | fmul %st(0); \ |
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| 146 | fstps (%esp); \ |
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| 147 | 6424: fstps (%esp); \ |
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| 148 | flds (%esp); \ |
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| 149 | addl $4, %esp; \ |
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| 150 | cfi_adjust_cfa_offset (-4); |
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| 151 | #define DBL_NARROW_EVAL_UFLOW_NONNAN \ |
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| 152 | subl $8, %esp; \ |
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| 153 | cfi_adjust_cfa_offset (8); \ |
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| 154 | fld %st(0); \ |
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| 155 | fabs; \ |
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| 156 | fcompl MO(dbl_min); \ |
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| 157 | fnstsw; \ |
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| 158 | sahf; \ |
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| 159 | jnc 6453f; \ |
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| 160 | fld %st(0); \ |
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| 161 | fmul %st(0); \ |
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| 162 | fstpl (%esp); \ |
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| 163 | 6453: fstpl (%esp); \ |
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| 164 | fldl (%esp); \ |
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| 165 | addl $8, %esp; \ |
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| 166 | cfi_adjust_cfa_offset (-8); |
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| 167 | |
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| 168 | /* Force an underflow exception if the given value is subnormal. The |
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| 169 | relevant constant for the minimum of the type must have been |
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| 170 | defined, the MO macro must have been defined for access to memory |
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| 171 | operands, and, if PIC, the PIC register must have been loaded. */ |
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| 172 | #define FLT_CHECK_FORCE_UFLOW \ |
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| 173 | flds MO(flt_min); \ |
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| 174 | fld %st(1); \ |
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| 175 | fabs; \ |
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| 176 | fucompp; \ |
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| 177 | fnstsw; \ |
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| 178 | sahf; \ |
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| 179 | jnc 6424f; \ |
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| 180 | subl $4, %esp; \ |
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| 181 | cfi_adjust_cfa_offset (4); \ |
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| 182 | fld %st(0); \ |
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| 183 | fmul %st(0); \ |
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| 184 | fstps (%esp); \ |
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| 185 | addl $4, %esp; \ |
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| 186 | cfi_adjust_cfa_offset (-4); \ |
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| 187 | 6424: |
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| 188 | #define DBL_CHECK_FORCE_UFLOW \ |
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| 189 | fldl MO(dbl_min); \ |
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| 190 | fld %st(1); \ |
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| 191 | fabs; \ |
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| 192 | fucompp; \ |
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| 193 | fnstsw; \ |
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| 194 | sahf; \ |
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| 195 | jnc 6453f; \ |
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| 196 | subl $8, %esp; \ |
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| 197 | cfi_adjust_cfa_offset (8); \ |
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| 198 | fld %st(0); \ |
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| 199 | fmul %st(0); \ |
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| 200 | fstpl (%esp); \ |
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| 201 | addl $8, %esp; \ |
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| 202 | cfi_adjust_cfa_offset (-8); \ |
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| 203 | 6453: |
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| 204 | |
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| 205 | /* Likewise, but also remove excess range and precision if the value |
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| 206 | is subnormal. */ |
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| 207 | #define FLT_CHECK_FORCE_UFLOW_NARROW \ |
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| 208 | flds MO(flt_min); \ |
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| 209 | fld %st(1); \ |
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| 210 | fabs; \ |
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| 211 | fucompp; \ |
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| 212 | fnstsw; \ |
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| 213 | sahf; \ |
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| 214 | jnc 6424f; \ |
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| 215 | subl $4, %esp; \ |
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| 216 | cfi_adjust_cfa_offset (4); \ |
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| 217 | fld %st(0); \ |
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| 218 | fmul %st(0); \ |
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| 219 | fstps (%esp); \ |
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| 220 | fstps (%esp); \ |
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| 221 | flds (%esp); \ |
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| 222 | addl $4, %esp; \ |
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| 223 | cfi_adjust_cfa_offset (-4); \ |
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| 224 | 6424: |
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| 225 | #define DBL_CHECK_FORCE_UFLOW_NARROW \ |
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| 226 | fldl MO(dbl_min); \ |
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| 227 | fld %st(1); \ |
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| 228 | fabs; \ |
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| 229 | fucompp; \ |
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| 230 | fnstsw; \ |
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| 231 | sahf; \ |
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| 232 | jnc 6453f; \ |
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| 233 | subl $8, %esp; \ |
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| 234 | cfi_adjust_cfa_offset (8); \ |
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| 235 | fld %st(0); \ |
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| 236 | fmul %st(0); \ |
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| 237 | fstpl (%esp); \ |
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| 238 | fstpl (%esp); \ |
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| 239 | fldl (%esp); \ |
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| 240 | addl $8, %esp; \ |
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| 241 | cfi_adjust_cfa_offset (-8); \ |
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| 242 | 6453: |
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| 243 | |
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| 244 | /* Likewise, but the argument is nonnegative or NaN. */ |
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| 245 | #define LDBL_CHECK_FORCE_UFLOW_NONNEG_NAN \ |
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| 246 | fldt MO(ldbl_min); \ |
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| 247 | fld %st(1); \ |
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| 248 | fucompp; \ |
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| 249 | fnstsw; \ |
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| 250 | sahf; \ |
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| 251 | jnc 6464f; \ |
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| 252 | fld %st(0); \ |
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| 253 | fmul %st(0); \ |
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| 254 | fstp %st(0); \ |
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| 255 | 6464: |
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| 256 | |
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| 257 | /* Likewise, but the argument is not a NaN. */ |
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| 258 | #define FLT_CHECK_FORCE_UFLOW_NONNAN \ |
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| 259 | fld %st(0); \ |
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| 260 | fabs; \ |
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| 261 | fcomps MO(flt_min); \ |
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| 262 | fnstsw; \ |
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| 263 | sahf; \ |
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| 264 | jnc 6424f; \ |
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| 265 | subl $4, %esp; \ |
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| 266 | cfi_adjust_cfa_offset (4); \ |
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| 267 | fld %st(0); \ |
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| 268 | fmul %st(0); \ |
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| 269 | fstps (%esp); \ |
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| 270 | addl $4, %esp; \ |
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| 271 | cfi_adjust_cfa_offset (-4); \ |
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| 272 | 6424: |
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| 273 | #define DBL_CHECK_FORCE_UFLOW_NONNAN \ |
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| 274 | fld %st(0); \ |
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| 275 | fabs; \ |
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| 276 | fcompl MO(dbl_min); \ |
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| 277 | fnstsw; \ |
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| 278 | sahf; \ |
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| 279 | jnc 6453f; \ |
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| 280 | subl $8, %esp; \ |
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| 281 | cfi_adjust_cfa_offset (8); \ |
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| 282 | fld %st(0); \ |
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| 283 | fmul %st(0); \ |
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| 284 | fstpl (%esp); \ |
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| 285 | addl $8, %esp; \ |
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| 286 | cfi_adjust_cfa_offset (-8); \ |
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| 287 | 6453: |
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| 288 | #define LDBL_CHECK_FORCE_UFLOW_NONNAN \ |
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| 289 | fldt MO(ldbl_min); \ |
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| 290 | fld %st(1); \ |
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| 291 | fabs; \ |
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| 292 | fcompp; \ |
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| 293 | fnstsw; \ |
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| 294 | sahf; \ |
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| 295 | jnc 6464f; \ |
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| 296 | fld %st(0); \ |
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| 297 | fmul %st(0); \ |
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| 298 | fstp %st(0); \ |
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| 299 | 6464: |
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| 300 | |
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| 301 | /* Likewise, but the argument is nonnegative and not a NaN. */ |
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| 302 | #define FLT_CHECK_FORCE_UFLOW_NONNEG \ |
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| 303 | fcoms MO(flt_min); \ |
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| 304 | fnstsw; \ |
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| 305 | sahf; \ |
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| 306 | jnc 6424f; \ |
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| 307 | subl $4, %esp; \ |
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| 308 | cfi_adjust_cfa_offset (4); \ |
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| 309 | fld %st(0); \ |
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| 310 | fmul %st(0); \ |
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| 311 | fstps (%esp); \ |
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| 312 | addl $4, %esp; \ |
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| 313 | cfi_adjust_cfa_offset (-4); \ |
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| 314 | 6424: |
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| 315 | #define DBL_CHECK_FORCE_UFLOW_NONNEG \ |
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| 316 | fcoml MO(dbl_min); \ |
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| 317 | fnstsw; \ |
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| 318 | sahf; \ |
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| 319 | jnc 6453f; \ |
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| 320 | subl $8, %esp; \ |
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| 321 | cfi_adjust_cfa_offset (8); \ |
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| 322 | fld %st(0); \ |
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| 323 | fmul %st(0); \ |
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| 324 | fstpl (%esp); \ |
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| 325 | addl $8, %esp; \ |
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| 326 | cfi_adjust_cfa_offset (-8); \ |
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| 327 | 6453: |
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| 328 | #define LDBL_CHECK_FORCE_UFLOW_NONNEG \ |
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| 329 | fldt MO(ldbl_min); \ |
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| 330 | fld %st(1); \ |
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| 331 | fcompp; \ |
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| 332 | fnstsw; \ |
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| 333 | sahf; \ |
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| 334 | jnc 6464f; \ |
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| 335 | fld %st(0); \ |
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| 336 | fmul %st(0); \ |
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| 337 | fstp %st(0); \ |
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| 338 | 6464: |
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| 339 | |
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| 340 | #endif /* i386-math-asm.h. */ |
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| 341 | |
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