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https://sourceware.org/git/glibc.git
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341 lines
8.1 KiB
C
341 lines
8.1 KiB
C
/* Helper macros for x86 libm functions.
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Copyright (C) 2015-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _I386_MATH_ASM_H
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#define _I386_MATH_ASM_H 1
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/* Remove excess range and precision by storing a value on the stack
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and loading it back. */
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#define FLT_NARROW_EVAL \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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fstps (%esp); \
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flds (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4);
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#define DBL_NARROW_EVAL \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fstpl (%esp); \
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fldl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8);
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/* Define constants for the minimum value of a floating-point
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type. */
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#define DEFINE_FLT_MIN \
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.section .rodata.cst4,"aM",@progbits,4; \
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.p2align 2; \
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.type flt_min,@object; \
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flt_min: \
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.byte 0, 0, 0x80, 0; \
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.size flt_min, .-flt_min;
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#define DEFINE_DBL_MIN \
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.section .rodata.cst8,"aM",@progbits,8; \
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.p2align 3; \
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.type dbl_min,@object; \
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dbl_min: \
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.byte 0, 0, 0, 0, 0, 0, 0x10, 0; \
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.size dbl_min, .-dbl_min;
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#define DEFINE_LDBL_MIN \
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.section .rodata.cst16,"aM",@progbits,16; \
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.p2align 4; \
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.type ldbl_min,@object; \
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ldbl_min: \
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.byte 0, 0, 0, 0, 0, 0, 0, 0x80, 0x1, 0; \
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.byte 0, 0, 0, 0, 0, 0; \
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.size ldbl_min, .-ldbl_min;
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/* Remove excess range and precision by storing a value on the stack
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and loading it back. The value is given to be nonnegative or NaN;
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if it is subnormal, also force an underflow exception. The
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relevant constant for the minimum of the type must have been
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defined, the MO macro must have been defined for access to memory
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operands, and, if PIC, the PIC register must have been loaded. */
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#define FLT_NARROW_EVAL_UFLOW_NONNEG_NAN \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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flds MO(flt_min); \
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fld %st(1); \
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fucompp; \
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fnstsw; \
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sahf; \
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jnc 6424f; \
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fld %st(0); \
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fmul %st(0); \
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fstps (%esp); \
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6424: fstps (%esp); \
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flds (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4);
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#define DBL_NARROW_EVAL_UFLOW_NONNEG_NAN \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fldl MO(dbl_min); \
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fld %st(1); \
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fucompp; \
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fnstsw; \
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sahf; \
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jnc 6453f; \
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fld %st(0); \
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fmul %st(0); \
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fstpl (%esp); \
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6453: fstpl (%esp); \
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fldl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8);
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/* Likewise, but the argument is not a NaN (so fcom instructions,
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which support memory operands, can be used). */
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#define FLT_NARROW_EVAL_UFLOW_NONNEG \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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fcoms MO(flt_min); \
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fnstsw; \
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sahf; \
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jnc 6424f; \
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fld %st(0); \
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fmul %st(0); \
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fstps (%esp); \
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6424: fstps (%esp); \
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flds (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4);
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#define DBL_NARROW_EVAL_UFLOW_NONNEG \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fcoml MO(dbl_min); \
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fnstsw; \
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sahf; \
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jnc 6453f; \
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fld %st(0); \
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fmul %st(0); \
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fstpl (%esp); \
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6453: fstpl (%esp); \
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fldl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8);
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/* Likewise, but the non-NaN argument may be negative. */
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#define FLT_NARROW_EVAL_UFLOW_NONNAN \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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fld %st(0); \
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fabs; \
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fcomps MO(flt_min); \
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fnstsw; \
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sahf; \
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jnc 6424f; \
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fld %st(0); \
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fmul %st(0); \
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fstps (%esp); \
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6424: fstps (%esp); \
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flds (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4);
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#define DBL_NARROW_EVAL_UFLOW_NONNAN \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fld %st(0); \
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fabs; \
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fcompl MO(dbl_min); \
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fnstsw; \
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sahf; \
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jnc 6453f; \
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fld %st(0); \
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fmul %st(0); \
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fstpl (%esp); \
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6453: fstpl (%esp); \
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fldl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8);
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/* Force an underflow exception if the given value is subnormal. The
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relevant constant for the minimum of the type must have been
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defined, the MO macro must have been defined for access to memory
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operands, and, if PIC, the PIC register must have been loaded. */
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#define FLT_CHECK_FORCE_UFLOW \
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flds MO(flt_min); \
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fld %st(1); \
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fabs; \
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fucompp; \
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fnstsw; \
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sahf; \
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jnc 6424f; \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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fld %st(0); \
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fmul %st(0); \
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fstps (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4); \
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6424:
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#define DBL_CHECK_FORCE_UFLOW \
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fldl MO(dbl_min); \
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fld %st(1); \
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fabs; \
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fucompp; \
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fnstsw; \
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sahf; \
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jnc 6453f; \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fld %st(0); \
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fmul %st(0); \
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fstpl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8); \
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6453:
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/* Likewise, but also remove excess range and precision if the value
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is subnormal. */
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#define FLT_CHECK_FORCE_UFLOW_NARROW \
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flds MO(flt_min); \
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fld %st(1); \
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fabs; \
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fucompp; \
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fnstsw; \
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sahf; \
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jnc 6424f; \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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fld %st(0); \
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fmul %st(0); \
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fstps (%esp); \
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fstps (%esp); \
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flds (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4); \
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6424:
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#define DBL_CHECK_FORCE_UFLOW_NARROW \
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fldl MO(dbl_min); \
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fld %st(1); \
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fabs; \
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fucompp; \
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fnstsw; \
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sahf; \
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jnc 6453f; \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fld %st(0); \
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fmul %st(0); \
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fstpl (%esp); \
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fstpl (%esp); \
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fldl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8); \
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6453:
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/* Likewise, but the argument is nonnegative or NaN. */
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#define LDBL_CHECK_FORCE_UFLOW_NONNEG_NAN \
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fldt MO(ldbl_min); \
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fld %st(1); \
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fucompp; \
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fnstsw; \
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sahf; \
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jnc 6464f; \
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fld %st(0); \
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fmul %st(0); \
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fstp %st(0); \
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6464:
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/* Likewise, but the argument is not a NaN. */
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#define FLT_CHECK_FORCE_UFLOW_NONNAN \
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fld %st(0); \
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fabs; \
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fcomps MO(flt_min); \
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fnstsw; \
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sahf; \
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jnc 6424f; \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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fld %st(0); \
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fmul %st(0); \
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fstps (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4); \
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6424:
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#define DBL_CHECK_FORCE_UFLOW_NONNAN \
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fld %st(0); \
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fabs; \
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fcompl MO(dbl_min); \
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fnstsw; \
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sahf; \
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jnc 6453f; \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fld %st(0); \
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fmul %st(0); \
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fstpl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8); \
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6453:
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#define LDBL_CHECK_FORCE_UFLOW_NONNAN \
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fldt MO(ldbl_min); \
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fld %st(1); \
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fabs; \
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fcompp; \
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fnstsw; \
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sahf; \
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jnc 6464f; \
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fld %st(0); \
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fmul %st(0); \
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fstp %st(0); \
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6464:
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/* Likewise, but the argument is nonnegative and not a NaN. */
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#define FLT_CHECK_FORCE_UFLOW_NONNEG \
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fcoms MO(flt_min); \
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fnstsw; \
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sahf; \
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jnc 6424f; \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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fld %st(0); \
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fmul %st(0); \
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fstps (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4); \
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6424:
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#define DBL_CHECK_FORCE_UFLOW_NONNEG \
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fcoml MO(dbl_min); \
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fnstsw; \
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sahf; \
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jnc 6453f; \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fld %st(0); \
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fmul %st(0); \
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fstpl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8); \
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6453:
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#define LDBL_CHECK_FORCE_UFLOW_NONNEG \
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fldt MO(ldbl_min); \
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fld %st(1); \
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fcompp; \
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fnstsw; \
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sahf; \
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jnc 6464f; \
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fld %st(0); \
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fmul %st(0); \
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fstp %st(0); \
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6464:
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#endif /* i386-math-asm.h. */
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