mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
341 lines
8.1 KiB
C
341 lines
8.1 KiB
C
/* Helper macros for x86 libm functions.
|
|
Copyright (C) 2015-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _I386_MATH_ASM_H
|
|
#define _I386_MATH_ASM_H 1
|
|
|
|
/* Remove excess range and precision by storing a value on the stack
|
|
and loading it back. */
|
|
#define FLT_NARROW_EVAL \
|
|
subl $4, %esp; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
fstps (%esp); \
|
|
flds (%esp); \
|
|
addl $4, %esp; \
|
|
cfi_adjust_cfa_offset (-4);
|
|
#define DBL_NARROW_EVAL \
|
|
subl $8, %esp; \
|
|
cfi_adjust_cfa_offset (8); \
|
|
fstpl (%esp); \
|
|
fldl (%esp); \
|
|
addl $8, %esp; \
|
|
cfi_adjust_cfa_offset (-8);
|
|
|
|
/* Define constants for the minimum value of a floating-point
|
|
type. */
|
|
#define DEFINE_FLT_MIN \
|
|
.section .rodata.cst4,"aM",@progbits,4; \
|
|
.p2align 2; \
|
|
.type flt_min,@object; \
|
|
flt_min: \
|
|
.byte 0, 0, 0x80, 0; \
|
|
.size flt_min, .-flt_min;
|
|
#define DEFINE_DBL_MIN \
|
|
.section .rodata.cst8,"aM",@progbits,8; \
|
|
.p2align 3; \
|
|
.type dbl_min,@object; \
|
|
dbl_min: \
|
|
.byte 0, 0, 0, 0, 0, 0, 0x10, 0; \
|
|
.size dbl_min, .-dbl_min;
|
|
#define DEFINE_LDBL_MIN \
|
|
.section .rodata.cst16,"aM",@progbits,16; \
|
|
.p2align 4; \
|
|
.type ldbl_min,@object; \
|
|
ldbl_min: \
|
|
.byte 0, 0, 0, 0, 0, 0, 0, 0x80, 0x1, 0; \
|
|
.byte 0, 0, 0, 0, 0, 0; \
|
|
.size ldbl_min, .-ldbl_min;
|
|
|
|
/* Remove excess range and precision by storing a value on the stack
|
|
and loading it back. The value is given to be nonnegative or NaN;
|
|
if it is subnormal, also force an underflow exception. The
|
|
relevant constant for the minimum of the type must have been
|
|
defined, the MO macro must have been defined for access to memory
|
|
operands, and, if PIC, the PIC register must have been loaded. */
|
|
#define FLT_NARROW_EVAL_UFLOW_NONNEG_NAN \
|
|
subl $4, %esp; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
flds MO(flt_min); \
|
|
fld %st(1); \
|
|
fucompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6424f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstps (%esp); \
|
|
6424: fstps (%esp); \
|
|
flds (%esp); \
|
|
addl $4, %esp; \
|
|
cfi_adjust_cfa_offset (-4);
|
|
#define DBL_NARROW_EVAL_UFLOW_NONNEG_NAN \
|
|
subl $8, %esp; \
|
|
cfi_adjust_cfa_offset (8); \
|
|
fldl MO(dbl_min); \
|
|
fld %st(1); \
|
|
fucompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6453f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstpl (%esp); \
|
|
6453: fstpl (%esp); \
|
|
fldl (%esp); \
|
|
addl $8, %esp; \
|
|
cfi_adjust_cfa_offset (-8);
|
|
|
|
/* Likewise, but the argument is not a NaN (so fcom instructions,
|
|
which support memory operands, can be used). */
|
|
#define FLT_NARROW_EVAL_UFLOW_NONNEG \
|
|
subl $4, %esp; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
fcoms MO(flt_min); \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6424f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstps (%esp); \
|
|
6424: fstps (%esp); \
|
|
flds (%esp); \
|
|
addl $4, %esp; \
|
|
cfi_adjust_cfa_offset (-4);
|
|
#define DBL_NARROW_EVAL_UFLOW_NONNEG \
|
|
subl $8, %esp; \
|
|
cfi_adjust_cfa_offset (8); \
|
|
fcoml MO(dbl_min); \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6453f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstpl (%esp); \
|
|
6453: fstpl (%esp); \
|
|
fldl (%esp); \
|
|
addl $8, %esp; \
|
|
cfi_adjust_cfa_offset (-8);
|
|
|
|
/* Likewise, but the non-NaN argument may be negative. */
|
|
#define FLT_NARROW_EVAL_UFLOW_NONNAN \
|
|
subl $4, %esp; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
fld %st(0); \
|
|
fabs; \
|
|
fcomps MO(flt_min); \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6424f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstps (%esp); \
|
|
6424: fstps (%esp); \
|
|
flds (%esp); \
|
|
addl $4, %esp; \
|
|
cfi_adjust_cfa_offset (-4);
|
|
#define DBL_NARROW_EVAL_UFLOW_NONNAN \
|
|
subl $8, %esp; \
|
|
cfi_adjust_cfa_offset (8); \
|
|
fld %st(0); \
|
|
fabs; \
|
|
fcompl MO(dbl_min); \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6453f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstpl (%esp); \
|
|
6453: fstpl (%esp); \
|
|
fldl (%esp); \
|
|
addl $8, %esp; \
|
|
cfi_adjust_cfa_offset (-8);
|
|
|
|
/* Force an underflow exception if the given value is subnormal. The
|
|
relevant constant for the minimum of the type must have been
|
|
defined, the MO macro must have been defined for access to memory
|
|
operands, and, if PIC, the PIC register must have been loaded. */
|
|
#define FLT_CHECK_FORCE_UFLOW \
|
|
flds MO(flt_min); \
|
|
fld %st(1); \
|
|
fabs; \
|
|
fucompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6424f; \
|
|
subl $4, %esp; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstps (%esp); \
|
|
addl $4, %esp; \
|
|
cfi_adjust_cfa_offset (-4); \
|
|
6424:
|
|
#define DBL_CHECK_FORCE_UFLOW \
|
|
fldl MO(dbl_min); \
|
|
fld %st(1); \
|
|
fabs; \
|
|
fucompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6453f; \
|
|
subl $8, %esp; \
|
|
cfi_adjust_cfa_offset (8); \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstpl (%esp); \
|
|
addl $8, %esp; \
|
|
cfi_adjust_cfa_offset (-8); \
|
|
6453:
|
|
|
|
/* Likewise, but also remove excess range and precision if the value
|
|
is subnormal. */
|
|
#define FLT_CHECK_FORCE_UFLOW_NARROW \
|
|
flds MO(flt_min); \
|
|
fld %st(1); \
|
|
fabs; \
|
|
fucompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6424f; \
|
|
subl $4, %esp; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstps (%esp); \
|
|
fstps (%esp); \
|
|
flds (%esp); \
|
|
addl $4, %esp; \
|
|
cfi_adjust_cfa_offset (-4); \
|
|
6424:
|
|
#define DBL_CHECK_FORCE_UFLOW_NARROW \
|
|
fldl MO(dbl_min); \
|
|
fld %st(1); \
|
|
fabs; \
|
|
fucompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6453f; \
|
|
subl $8, %esp; \
|
|
cfi_adjust_cfa_offset (8); \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstpl (%esp); \
|
|
fstpl (%esp); \
|
|
fldl (%esp); \
|
|
addl $8, %esp; \
|
|
cfi_adjust_cfa_offset (-8); \
|
|
6453:
|
|
|
|
/* Likewise, but the argument is nonnegative or NaN. */
|
|
#define LDBL_CHECK_FORCE_UFLOW_NONNEG_NAN \
|
|
fldt MO(ldbl_min); \
|
|
fld %st(1); \
|
|
fucompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6464f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstp %st(0); \
|
|
6464:
|
|
|
|
/* Likewise, but the argument is not a NaN. */
|
|
#define FLT_CHECK_FORCE_UFLOW_NONNAN \
|
|
fld %st(0); \
|
|
fabs; \
|
|
fcomps MO(flt_min); \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6424f; \
|
|
subl $4, %esp; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstps (%esp); \
|
|
addl $4, %esp; \
|
|
cfi_adjust_cfa_offset (-4); \
|
|
6424:
|
|
#define DBL_CHECK_FORCE_UFLOW_NONNAN \
|
|
fld %st(0); \
|
|
fabs; \
|
|
fcompl MO(dbl_min); \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6453f; \
|
|
subl $8, %esp; \
|
|
cfi_adjust_cfa_offset (8); \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstpl (%esp); \
|
|
addl $8, %esp; \
|
|
cfi_adjust_cfa_offset (-8); \
|
|
6453:
|
|
#define LDBL_CHECK_FORCE_UFLOW_NONNAN \
|
|
fldt MO(ldbl_min); \
|
|
fld %st(1); \
|
|
fabs; \
|
|
fcompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6464f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstp %st(0); \
|
|
6464:
|
|
|
|
/* Likewise, but the argument is nonnegative and not a NaN. */
|
|
#define FLT_CHECK_FORCE_UFLOW_NONNEG \
|
|
fcoms MO(flt_min); \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6424f; \
|
|
subl $4, %esp; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstps (%esp); \
|
|
addl $4, %esp; \
|
|
cfi_adjust_cfa_offset (-4); \
|
|
6424:
|
|
#define DBL_CHECK_FORCE_UFLOW_NONNEG \
|
|
fcoml MO(dbl_min); \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6453f; \
|
|
subl $8, %esp; \
|
|
cfi_adjust_cfa_offset (8); \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstpl (%esp); \
|
|
addl $8, %esp; \
|
|
cfi_adjust_cfa_offset (-8); \
|
|
6453:
|
|
#define LDBL_CHECK_FORCE_UFLOW_NONNEG \
|
|
fldt MO(ldbl_min); \
|
|
fld %st(1); \
|
|
fcompp; \
|
|
fnstsw; \
|
|
sahf; \
|
|
jnc 6464f; \
|
|
fld %st(0); \
|
|
fmul %st(0); \
|
|
fstp %st(0); \
|
|
6464:
|
|
|
|
#endif /* i386-math-asm.h. */
|