mirror of git://gcc.gnu.org/git/gcc.git
divv2df3.c: New file.
* config/spu/divv2df3.c: New file. * config/spu/t-spu-elf (LIB2FUNCS_STATIC_EXTRA): Add it. (DPBIT_FUNCS): Filter out _div_df. From-SVN: r145089
This commit is contained in:
Ulrich Weigand
Ulrich Weigand
parent
d43f68d639
commit
61238a7986
|
|
@ -1,3 +1,9 @@
|
|||
2009-03-26 Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
|
||||
|
||||
* config/spu/divv2df3.c: New file.
|
||||
* config/spu/t-spu-elf (LIB2FUNCS_STATIC_EXTRA): Add it.
|
||||
(DPBIT_FUNCS): Filter out _div_df.
|
||||
|
||||
2009-03-26 Bernd Schmidt <bernd.schmidt@analog.com>
|
||||
|
||||
* config/bfin/bfin.c (bfin_optimize_loop): If the LSETUP goes before
|
||||
|
|
|
|||
|
|
@ -0,0 +1,198 @@
|
|||
/* Copyright (C) 2009 Free Software Foundation, Inc.
|
||||
|
||||
This file is free software; you can redistribute it and/or modify it under
|
||||
the terms of the GNU General Public License as published by the Free
|
||||
Software Foundation; either version 2 of the License, or (at your option)
|
||||
any later version.
|
||||
|
||||
This file 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 General Public License
|
||||
for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this file; see the file COPYING. If not, write to the Free
|
||||
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
|
||||
02110-1301, USA. */
|
||||
|
||||
/* As a special exception, if you link this library with files compiled with
|
||||
GCC to produce an executable, this does not cause the resulting executable
|
||||
to be covered by the GNU General Public License. The exception does not
|
||||
however invalidate any other reasons why the executable file might be covered
|
||||
by the GNU General Public License. */
|
||||
|
||||
|
||||
#include <spu_intrinsics.h>
|
||||
|
||||
vector double __divv2df3 (vector double a_in, vector double b_in);
|
||||
|
||||
/* __divv2df3 divides the vector dividend a by the vector divisor b and
|
||||
returns the resulting vector quotient. Maximum error about 0.5 ulp
|
||||
over entire double range including denorms, compared to true result
|
||||
in round-to-nearest rounding mode. Handles Inf or NaN operands and
|
||||
results correctly. */
|
||||
|
||||
vector double
|
||||
__divv2df3 (vector double a_in, vector double b_in)
|
||||
{
|
||||
/* Variables */
|
||||
vec_int4 exp, exp_bias;
|
||||
vec_uint4 no_underflow, overflow;
|
||||
vec_float4 mant_bf, inv_bf;
|
||||
vec_ullong2 exp_a, exp_b;
|
||||
vec_ullong2 a_nan, a_zero, a_inf, a_denorm, a_denorm0;
|
||||
vec_ullong2 b_nan, b_zero, b_inf, b_denorm, b_denorm0;
|
||||
vec_ullong2 nan;
|
||||
vec_uint4 a_exp, b_exp;
|
||||
vec_ullong2 a_mant_0, b_mant_0;
|
||||
vec_ullong2 a_exp_1s, b_exp_1s;
|
||||
vec_ullong2 sign_exp_mask;
|
||||
|
||||
vec_double2 a, b;
|
||||
vec_double2 mant_a, mant_b, inv_b, q0, q1, q2, mult;
|
||||
|
||||
/* Constants */
|
||||
vec_uint4 exp_mask_u32 = spu_splats((unsigned int)0x7FF00000);
|
||||
vec_uchar16 splat_hi = (vec_uchar16){0,1,2,3, 0,1,2,3, 8, 9,10,11, 8,9,10,11};
|
||||
vec_uchar16 swap_32 = (vec_uchar16){4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11};
|
||||
vec_ullong2 exp_mask = spu_splats(0x7FF0000000000000ULL);
|
||||
vec_ullong2 sign_mask = spu_splats(0x8000000000000000ULL);
|
||||
vec_float4 onef = spu_splats(1.0f);
|
||||
vec_double2 one = spu_splats(1.0);
|
||||
vec_double2 exp_53 = (vec_double2)spu_splats(0x0350000000000000ULL);
|
||||
|
||||
sign_exp_mask = spu_or(sign_mask, exp_mask);
|
||||
|
||||
/* Extract the floating point components from each of the operands including
|
||||
* exponent and mantissa.
|
||||
*/
|
||||
a_exp = (vec_uint4)spu_and((vec_uint4)a_in, exp_mask_u32);
|
||||
a_exp = spu_shuffle(a_exp, a_exp, splat_hi);
|
||||
b_exp = (vec_uint4)spu_and((vec_uint4)b_in, exp_mask_u32);
|
||||
b_exp = spu_shuffle(b_exp, b_exp, splat_hi);
|
||||
|
||||
a_mant_0 = (vec_ullong2)spu_cmpeq((vec_uint4)spu_andc((vec_ullong2)a_in, sign_exp_mask), 0);
|
||||
a_mant_0 = spu_and(a_mant_0, spu_shuffle(a_mant_0, a_mant_0, swap_32));
|
||||
|
||||
b_mant_0 = (vec_ullong2)spu_cmpeq((vec_uint4)spu_andc((vec_ullong2)b_in, sign_exp_mask), 0);
|
||||
b_mant_0 = spu_and(b_mant_0, spu_shuffle(b_mant_0, b_mant_0, swap_32));
|
||||
|
||||
a_exp_1s = (vec_ullong2)spu_cmpeq(a_exp, exp_mask_u32);
|
||||
b_exp_1s = (vec_ullong2)spu_cmpeq(b_exp, exp_mask_u32);
|
||||
|
||||
/* Identify all possible special values that must be accomodated including:
|
||||
* +-denorm, +-0, +-infinity, and NaNs.
|
||||
*/
|
||||
a_denorm0= (vec_ullong2)spu_cmpeq(a_exp, 0);
|
||||
a_nan = spu_andc(a_exp_1s, a_mant_0);
|
||||
a_zero = spu_and (a_denorm0, a_mant_0);
|
||||
a_inf = spu_and (a_exp_1s, a_mant_0);
|
||||
a_denorm = spu_andc(a_denorm0, a_zero);
|
||||
|
||||
b_denorm0= (vec_ullong2)spu_cmpeq(b_exp, 0);
|
||||
b_nan = spu_andc(b_exp_1s, b_mant_0);
|
||||
b_zero = spu_and (b_denorm0, b_mant_0);
|
||||
b_inf = spu_and (b_exp_1s, b_mant_0);
|
||||
b_denorm = spu_andc(b_denorm0, b_zero);
|
||||
|
||||
/* Scale denorm inputs to into normalized numbers by conditionally scaling the
|
||||
* input parameters.
|
||||
*/
|
||||
a = spu_sub(spu_or(a_in, exp_53), spu_sel(exp_53, a_in, sign_mask));
|
||||
a = spu_sel(a_in, a, a_denorm);
|
||||
|
||||
b = spu_sub(spu_or(b_in, exp_53), spu_sel(exp_53, b_in, sign_mask));
|
||||
b = spu_sel(b_in, b, b_denorm);
|
||||
|
||||
/* Extract the divisor and dividend exponent and force parameters into the signed
|
||||
* range [1.0,2.0) or [-1.0,2.0).
|
||||
*/
|
||||
exp_a = spu_and((vec_ullong2)a, exp_mask);
|
||||
exp_b = spu_and((vec_ullong2)b, exp_mask);
|
||||
|
||||
mant_a = spu_sel(a, one, (vec_ullong2)exp_mask);
|
||||
mant_b = spu_sel(b, one, (vec_ullong2)exp_mask);
|
||||
|
||||
/* Approximate the single reciprocal of b by using
|
||||
* the single precision reciprocal estimate followed by one
|
||||
* single precision iteration of Newton-Raphson.
|
||||
*/
|
||||
mant_bf = spu_roundtf(mant_b);
|
||||
inv_bf = spu_re(mant_bf);
|
||||
inv_bf = spu_madd(spu_nmsub(mant_bf, inv_bf, onef), inv_bf, inv_bf);
|
||||
|
||||
/* Perform 2 more Newton-Raphson iterations in double precision. The
|
||||
* result (q1) is in the range (0.5, 2.0).
|
||||
*/
|
||||
inv_b = spu_extend(inv_bf);
|
||||
inv_b = spu_madd(spu_nmsub(mant_b, inv_b, one), inv_b, inv_b);
|
||||
q0 = spu_mul(mant_a, inv_b);
|
||||
q1 = spu_madd(spu_nmsub(mant_b, q0, mant_a), inv_b, q0);
|
||||
|
||||
/* Determine the exponent correction factor that must be applied
|
||||
* to q1 by taking into account the exponent of the normalized inputs
|
||||
* and the scale factors that were applied to normalize them.
|
||||
*/
|
||||
exp = spu_rlmaska(spu_sub((vec_int4)exp_a, (vec_int4)exp_b), -20);
|
||||
exp = spu_add(exp, (vec_int4)spu_add(spu_and((vec_int4)a_denorm, -0x34), spu_and((vec_int4)b_denorm, 0x34)));
|
||||
|
||||
/* Bias the quotient exponent depending on the sign of the exponent correction
|
||||
* factor so that a single multiplier will ensure the entire double precision
|
||||
* domain (including denorms) can be achieved.
|
||||
*
|
||||
* exp bias q1 adjust exp
|
||||
* ===== ======== ==========
|
||||
* positive 2^+65 -65
|
||||
* negative 2^-64 +64
|
||||
*/
|
||||
exp_bias = spu_xor(spu_rlmaska(exp, -31), 64);
|
||||
exp = spu_sub(exp, exp_bias);
|
||||
|
||||
q1 = spu_sel(q1, (vec_double2)spu_add((vec_int4)q1, spu_sl(exp_bias, 20)), exp_mask);
|
||||
|
||||
/* Compute a multiplier (mult) to applied to the quotient (q1) to produce the
|
||||
* expected result. On overflow, clamp the multiplier to the maximum non-infinite
|
||||
* number in case the rounding mode is not round-to-nearest.
|
||||
*/
|
||||
exp = spu_add(exp, 0x3FF);
|
||||
no_underflow = spu_cmpgt(exp, 0);
|
||||
overflow = spu_cmpgt(exp, 0x7FE);
|
||||
exp = spu_and(spu_sl(exp, 20), (vec_int4)no_underflow);
|
||||
exp = spu_and(exp, (vec_int4)exp_mask);
|
||||
|
||||
mult = spu_sel((vec_double2)exp, (vec_double2)(spu_add((vec_uint4)exp_mask, -1)), (vec_ullong2)overflow);
|
||||
|
||||
/* Handle special value conditions. These include:
|
||||
*
|
||||
* 1) IF either operand is a NaN OR both operands are 0 or INFINITY THEN a NaN
|
||||
* results.
|
||||
* 2) ELSE IF the dividend is an INFINITY OR the divisor is 0 THEN a INFINITY results.
|
||||
* 3) ELSE IF the dividend is 0 OR the divisor is INFINITY THEN a 0 results.
|
||||
*/
|
||||
mult = spu_andc(mult, (vec_double2)spu_or(a_zero, b_inf));
|
||||
mult = spu_sel(mult, (vec_double2)exp_mask, spu_or(a_inf, b_zero));
|
||||
|
||||
nan = spu_or(a_nan, b_nan);
|
||||
nan = spu_or(nan, spu_and(a_zero, b_zero));
|
||||
nan = spu_or(nan, spu_and(a_inf, b_inf));
|
||||
|
||||
mult = spu_or(mult, (vec_double2)nan);
|
||||
|
||||
/* Scale the final quotient */
|
||||
|
||||
q2 = spu_mul(q1, mult);
|
||||
|
||||
return (q2);
|
||||
}
|
||||
|
||||
|
||||
/* We use the same function for vector and scalar division. Provide the
|
||||
scalar entry point as an alias. */
|
||||
double __divdf3 (double a, double b)
|
||||
__attribute__ ((__alias__ ("__divv2df3")));
|
||||
|
||||
/* Some toolchain builds used the __fast_divdf3 name for this helper function.
|
||||
Provide this as another alternate entry point for compatibility. */
|
||||
double __fast_divdf3 (double a, double b)
|
||||
__attribute__ ((__alias__ ("__divv2df3")));
|
||||
|
||||
|
|
@ -29,6 +29,10 @@ TARGET_LIBGCC2_CFLAGS = -fPIC -mwarn-reloc -D__IN_LIBGCC2
|
|||
# own versions below.
|
||||
LIB2FUNCS_EXCLUDE = _floatdisf _floatundisf
|
||||
|
||||
# We provide our own version of __divdf3 that performs better and has
|
||||
# better support for non-default rounding modes.
|
||||
DPBIT_FUNCS := $(filter-out _div_df, $(DPBIT_FUNCS))
|
||||
|
||||
LIB2FUNCS_STATIC_EXTRA = $(srcdir)/config/spu/float_unssidf.c \
|
||||
$(srcdir)/config/spu/float_unsdidf.c \
|
||||
$(srcdir)/config/spu/float_unsdisf.c \
|
||||
|
|
@ -39,7 +43,8 @@ LIB2FUNCS_STATIC_EXTRA = $(srcdir)/config/spu/float_unssidf.c \
|
|||
$(srcdir)/config/spu/mfc_multi_tag_reserve.c \
|
||||
$(srcdir)/config/spu/mfc_multi_tag_release.c \
|
||||
$(srcdir)/config/spu/multi3.c \
|
||||
$(srcdir)/config/spu/divmodti4.c
|
||||
$(srcdir)/config/spu/divmodti4.c \
|
||||
$(srcdir)/config/spu/divv2df3.c
|
||||
|
||||
LIB2ADDEH = $(srcdir)/unwind-dw2.c $(srcdir)/unwind-dw2-fde.c \
|
||||
$(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
|
||||
|
|
|
|||
Loading…
Reference in New Issue