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MIPS: math-emu: Cleanup definition of structs describe sp/dp floats. 

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2014-04-25 15:48:40 +02:00
parent de2fc342b8
commit 49548b09e0
5 changed files with 73 additions and 86 deletions
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6
arch/mips/math-emu/dp_sqrt.c
View File

@ -110,13 +110,13 @@ union ieee754dp ieee754dp_sqrt(union ieee754dp x)
/* triple to almost 56 sig. bits: y ~= sqrt(x) to within 1 ulp */
/* t=y*y; z=t; pt[n0]+=0x00100000; t+=z; z=(x-z)*y; */
z = t = ieee754dp_mul(y, y);
t.parts.bexp += 0x001;
t.bexp += 0x001;
t = ieee754dp_add(t, z);
z = ieee754dp_mul(ieee754dp_sub(x, z), y);
/* t=z/(t+x) ; pt[n0]+=0x00100000; y+=t; */
t = ieee754dp_div(z, ieee754dp_add(t, x));
t.parts.bexp += 0x001;
t.bexp += 0x001;
y = ieee754dp_add(y, t);
/* twiddle last bit to force y correctly rounded */
@ -155,7 +155,7 @@ union ieee754dp ieee754dp_sqrt(union ieee754dp x)
}
/* py[n0]=py[n0]+scalx; ...scale back y */
y.parts.bexp += scalx;
y.bexp += scalx;
/* restore rounding mode, possibly set inexact */
ieee754_csr = oldcsr;

97
arch/mips/math-emu/ieee754.c
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@ -30,64 +30,63 @@
#include <linux/compiler.h>
#include "ieee754int.h"
#include "ieee754.h"
#include "ieee754sp.h"
#include "ieee754dp.h"
/* special constants
*/
#define DPSTR(s, b, mh, ml) \
#define DPCNST(s, b, m) \
{ \
.sign = (s), \
.bexp = (b), \
.manthi = (mh), \
.mantlo = (ml) \
}
const struct ieee754dp_const __ieee754dp_spcvals[] = {
DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */
DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */
DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */
DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */
DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */
DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */
DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */
DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */
DPSTR(0, DP_EMAX+1+DP_EBIAS, 0x7FFFF, 0xFFFFFFFF), /* + indef quiet Nan */
DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */
DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */
DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */
DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */
DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */
DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */
DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */
DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */
};
#define SPSTR(s, b, m) \
{ \
.sign = (s), \
.bexp = (b), \
.bexp = (b) + DP_EBIAS, \
.mant = (m) \
}
const struct ieee754sp_const __ieee754sp_spcvals[] = {
SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */
SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */
SPSTR(0, SP_EBIAS, 0), /* + 1.0 */
SPSTR(1, SP_EBIAS, 0), /* - 1.0 */
SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */
SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */
SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */
SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */
SPSTR(0, SP_EMAX+1+SP_EBIAS, 0x3FFFFF), /* + indef quiet Nan */
SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */
SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */
SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */
SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */
SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */
SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */
SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */
SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */
const union ieee754dp __ieee754dp_spcvals[] = {
DPCNST(0, DP_EMIN - 1, 0x0000000000000ULL), /* + zero */
DPCNST(1, DP_EMIN - 1, 0x0000000000000ULL), /* - zero */
DPCNST(0, 0, 0x0000000000000ULL), /* + 1.0 */
DPCNST(1, 0, 0x0000000000000ULL), /* - 1.0 */
DPCNST(0, 3, 0x4000000000000ULL), /* + 10.0 */
DPCNST(1, 3, 0x4000000000000ULL), /* - 10.0 */
DPCNST(0, DP_EMAX + 1, 0x0000000000000ULL), /* + infinity */
DPCNST(1, DP_EMAX + 1, 0x0000000000000ULL), /* - infinity */
DPCNST(0, DP_EMAX + 1, 0x7FFFFFFFFFFFFULL), /* + indef quiet Nan */
DPCNST(0, DP_EMAX, 0xFFFFFFFFFFFFFULL), /* + max */
DPCNST(1, DP_EMAX, 0xFFFFFFFFFFFFFULL), /* - max */
DPCNST(0, DP_EMIN, 0x0000000000000ULL), /* + min normal */
DPCNST(1, DP_EMIN, 0x0000000000000ULL), /* - min normal */
DPCNST(0, DP_EMIN - 1, 0x0000000000001ULL), /* + min denormal */
DPCNST(1, DP_EMIN - 1, 0x0000000000001ULL), /* - min denormal */
DPCNST(0, 31, 0x0000000000000ULL), /* + 1.0e31 */
DPCNST(0, 63, 0x0000000000000ULL), /* + 1.0e63 */
};
#define SPCNST(s, b, m) \
{ \
.sign = (s), \
.bexp = (b) + SP_EBIAS, \
.mant = (m) \
}
const union ieee754sp __ieee754sp_spcvals[] = {
SPCNST(0, SP_EMIN - 1, 0x000000), /* + zero */
SPCNST(1, SP_EMIN - 1, 0x000000), /* - zero */
SPCNST(0, 0, 0x000000), /* + 1.0 */
SPCNST(1, 0, 0x000000), /* - 1.0 */
SPCNST(0, 3, 0x200000), /* + 10.0 */
SPCNST(1, 3, 0x200000), /* - 10.0 */
SPCNST(0, SP_EMAX + 1, 0x000000), /* + infinity */
SPCNST(1, SP_EMAX + 1, 0x000000), /* - infinity */
SPCNST(0, SP_EMAX + 1, 0x3FFFFF), /* + indef quiet Nan */
SPCNST(0, SP_EMAX, 0x7FFFFF), /* + max normal */
SPCNST(1, SP_EMAX, 0x7FFFFF), /* - max normal */
SPCNST(0, SP_EMIN, 0x000000), /* + min normal */
SPCNST(1, SP_EMIN, 0x000000), /* - min normal */
SPCNST(0, SP_EMIN - 1, 0x000001), /* + min denormal */
SPCNST(1, SP_EMIN - 1, 0x000001), /* - min denormal */
SPCNST(0, 31, 0x000000), /* + 1.0e31 */
SPCNST(0, 63, 0x000000), /* + 1.0e63 */
};

31
arch/mips/math-emu/ieee754.h
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@ -31,36 +31,23 @@
#include <linux/sched.h>
#include <asm/bitfield.h>
struct ieee754dp_const {
__BITFIELD_FIELD(unsigned sign:1,
__BITFIELD_FIELD(unsigned bexp:11,
__BITFIELD_FIELD(unsigned manthi:20,
__BITFIELD_FIELD(unsigned mantlo:32,
;))))
};
union ieee754dp {
struct ieee754dp_const oparts;
struct {
__BITFIELD_FIELD(unsigned int sign:1,
__BITFIELD_FIELD(unsigned int bexp:11,
__BITFIELD_FIELD(u64 mant:52,
;)))
} parts;
double d;
};
u64 bits;
};
struct ieee754sp_const {
__BITFIELD_FIELD(unsigned sign:1,
__BITFIELD_FIELD(unsigned bexp:8,
__BITFIELD_FIELD(unsigned mant:23,
;)))
};
union ieee754sp {
struct ieee754sp_const parts;
float f;
struct {
__BITFIELD_FIELD(unsigned sign:1,
__BITFIELD_FIELD(unsigned bexp:8,
__BITFIELD_FIELD(unsigned mant:23,
;)))
};
u32 bits;
};
@ -299,8 +286,8 @@ union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
#define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
#define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
extern const struct ieee754dp_const __ieee754dp_spcvals[];
extern const struct ieee754sp_const __ieee754sp_spcvals[];
extern const union ieee754dp __ieee754dp_spcvals[];
extern const union ieee754sp __ieee754sp_spcvals[];
#define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
#define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)

13
arch/mips/math-emu/ieee754dp.h
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@ -40,9 +40,9 @@
#define DP_HIDDEN_BIT DP_MBIT(DP_FBITS)
#define DP_SIGN_BIT DP_MBIT(63)
#define DPSIGN(dp) (dp.parts.sign)
#define DPBEXP(dp) (dp.parts.bexp)
#define DPMANT(dp) (dp.parts.mant)
#define DPSIGN(dp) (dp.sign)
#define DPBEXP(dp) (dp.bexp)
#define DPMANT(dp) (dp.mant)
static inline int ieee754dp_finite(union ieee754dp x)
{
@ -74,9 +74,10 @@ static inline union ieee754dp builddp(int s, int bx, u64 m)
&& (bx) <= DP_EMAX + 1 + DP_EBIAS);
assert(((m) >> DP_FBITS) == 0);
r.parts.sign = s;
r.parts.bexp = bx;
r.parts.mant = m;
r.sign = s;
r.bexp = bx;
r.mant = m;
return r;
}

12
arch/mips/math-emu/ieee754sp.h
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@ -40,9 +40,9 @@
#define SP_HIDDEN_BIT SP_MBIT(SP_FBITS)
#define SP_SIGN_BIT SP_MBIT(31)
#define SPSIGN(sp) (sp.parts.sign)
#define SPBEXP(sp) (sp.parts.bexp)
#define SPMANT(sp) (sp.parts.mant)
#define SPSIGN(sp) (sp.sign)
#define SPBEXP(sp) (sp.bexp)
#define SPMANT(sp) (sp.mant)
static inline int ieee754sp_finite(union ieee754sp x)
{
@ -79,9 +79,9 @@ static inline union ieee754sp buildsp(int s, int bx, unsigned m)
&& (bx) <= SP_EMAX + 1 + SP_EBIAS);
assert(((m) >> SP_FBITS) == 0);
r.parts.sign = s;
r.parts.bexp = bx;
r.parts.mant = m;
r.sign = s;
r.bexp = bx;
r.mant = m;
return r;
}