/* Determine rounding mode from the RM bits of the FCSR */
#define modeindex(v) ((v) & FPU_CSR_RM)
-/* Convert MIPS rounding mode (0..3) to IEEE library modes. */
-static const unsigned char ieee_rm[4] = {
- [FPU_CSR_RN] = IEEE754_RN,
- [FPU_CSR_RZ] = IEEE754_RZ,
- [FPU_CSR_RU] = IEEE754_RU,
- [FPU_CSR_RD] = IEEE754_RD,
-};
-/* Convert IEEE library modes to MIPS rounding mode (0..3). */
-static const unsigned char mips_rm[4] = {
- [IEEE754_RN] = FPU_CSR_RN,
- [IEEE754_RZ] = FPU_CSR_RZ,
- [IEEE754_RD] = FPU_CSR_RD,
- [IEEE754_RU] = FPU_CSR_RU,
-};
-
/* convert condition code register number to csr bit */
static const unsigned int fpucondbit[8] = {
FPU_CSR_COND0,
/* cop control register rd -> gpr[rt] */
if (MIPSInst_RD(ir) == FPCREG_CSR) {
value = ctx->fcr31;
- value = (value & ~FPU_CSR_RM) |
- mips_rm[modeindex(value)];
+ value = (value & ~FPU_CSR_RM) | modeindex(value);
pr_debug("%p gpr[%d]<-csr=%08x\n",
(void *) (xcp->cp0_epc),
MIPSInst_RT(ir), value);
* Don't write reserved bits,
* and convert to ieee library modes
*/
- ctx->fcr31 = (value &
- ~(FPU_CSR_RSVD | FPU_CSR_RM)) |
- ieee_rm[modeindex(value)];
+ ctx->fcr31 = (value & ~(FPU_CSR_RSVD | FPU_CSR_RM)) |
+ modeindex(value);
}
if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) {
return SIGFPE;
oldrm = ieee754_csr.rm;
SPFROMREG(fs, MIPSInst_FS(ir));
- ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
+ ieee754_csr.rm = modeindex(MIPSInst_FUNC(ir));
rv.w = ieee754sp_tint(fs);
ieee754_csr.rm = oldrm;
rfmt = w_fmt;
oldrm = ieee754_csr.rm;
SPFROMREG(fs, MIPSInst_FS(ir));
- ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
+ ieee754_csr.rm = modeindex(MIPSInst_FUNC(ir));
rv.l = ieee754sp_tlong(fs);
ieee754_csr.rm = oldrm;
rfmt = l_fmt;
oldrm = ieee754_csr.rm;
DPFROMREG(fs, MIPSInst_FS(ir));
- ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
+ ieee754_csr.rm = modeindex(MIPSInst_FUNC(ir));
rv.w = ieee754dp_tint(fs);
ieee754_csr.rm = oldrm;
rfmt = w_fmt;
oldrm = ieee754_csr.rm;
DPFROMREG(fs, MIPSInst_FS(ir));
- ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
+ ieee754_csr.rm = modeindex(MIPSInst_FUNC(ir));
rv.l = ieee754dp_tlong(fs);
ieee754_csr.rm = oldrm;
rfmt = l_fmt;
* ieee754_csr. But ieee754_csr.rm is ieee
* library modes. (not mips rounding mode)
*/
- /* convert to ieee library modes */
- ieee754_csr.rm = ieee_rm[ieee754_csr.rm];
sig = cop1Emulate(xcp, ctx, dec_insn, fault_addr);
- /* revert to mips rounding mode */
- ieee754_csr.rm = mips_rm[ieee754_csr.rm];
}
if (has_fpu)
if (xs == ys)
return x;
else
- return ieee754dp_zero(ieee754_csr.rm == IEEE754_RD);
+ return ieee754dp_zero(ieee754_csr.rm == FPU_CSR_RD);
case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_ZERO):
case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_ZERO):
xs = ys;
}
if (xm == 0)
- return ieee754dp_zero(ieee754_csr.rm == IEEE754_RD);
+ return ieee754dp_zero(ieee754_csr.rm == FPU_CSR_RD);
/*
* Normalize to rounding precision.
oldcsr = ieee754_csr;
ieee754_csr.mx &= ~IEEE754_INEXACT;
ieee754_csr.sx &= ~IEEE754_INEXACT;
- ieee754_csr.rm = IEEE754_RN;
+ ieee754_csr.rm = FPU_CSR_RN;
/* adjust exponent to prevent overflow */
scalx = 0;
/* twiddle last bit to force y correctly rounded */
/* set RZ, clear INEX flag */
- ieee754_csr.rm = IEEE754_RZ;
+ ieee754_csr.rm = FPU_CSR_RZ;
ieee754_csr.sx &= ~IEEE754_INEXACT;
/* t=x/y; ...chopped quotient, possibly inexact */
oldcsr.sx |= IEEE754_INEXACT;
switch (oldcsr.rm) {
- case IEEE754_RU:
+ case FPU_CSR_RU:
y.bits += 1;
/* drop through */
- case IEEE754_RN:
+ case FPU_CSR_RN:
t.bits += 1;
break;
}
if (xs != ys)
return x;
else
- return ieee754dp_zero(ieee754_csr.rm == IEEE754_RD);
+ return ieee754dp_zero(ieee754_csr.rm == FPU_CSR_RD);
case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_ZERO):
case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_ZERO):
xs = ys;
}
if (xm == 0) {
- if (ieee754_csr.rm == IEEE754_RD)
+ if (ieee754_csr.rm == FPU_CSR_RD)
return ieee754dp_zero(1); /* round negative inf. => sign = -1 */
else
return ieee754dp_zero(0); /* other round modes => sign = 1 */
to be zero */
odd = (xm & 0x1) != 0x0;
switch (ieee754_csr.rm) {
- case IEEE754_RN:
+ case FPU_CSR_RN:
if (round && (sticky || odd))
xm++;
break;
- case IEEE754_RZ:
+ case FPU_CSR_RZ:
break;
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if ((round || sticky) && !xs)
xm++;
break;
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if ((round || sticky) && xs)
xm++;
break;
}
odd = (xm & 0x1) != 0x0;
switch (ieee754_csr.rm) {
- case IEEE754_RN:
+ case FPU_CSR_RN:
if (round && (sticky || odd))
xm++;
break;
- case IEEE754_RZ:
+ case FPU_CSR_RZ:
break;
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if ((round || sticky) && !xs)
xm++;
break;
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if ((round || sticky) && xs)
xm++;
break;
#define IEEE754_CGT 0x04
#define IEEE754_CUN 0x08
-/* rounding mode
-*/
-#define IEEE754_RN 0 /* round to nearest */
-#define IEEE754_RZ 1 /* round toward zero */
-#define IEEE754_RD 2 /* round toward -Infinity */
-#define IEEE754_RU 3 /* round toward +Infinity */
-
/* "normal" comparisons
*/
static inline int ieee754sp_eq(union ieee754sp x, union ieee754sp y)
*/
if (xm & (DP_MBIT(3) - 1)) {
switch (ieee754_csr.rm) {
- case IEEE754_RZ:
+ case FPU_CSR_RZ:
break;
- case IEEE754_RN:
+ case FPU_CSR_RN:
xm += 0x3 + ((xm >> 3) & 1);
/* xm += (xm&0x8)?0x4:0x3 */
break;
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if (!sn) /* ?? */
xm += 0x8;
break;
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if (sn) /* ?? */
xm += 0x8;
break;
ieee754_setcx(IEEE754_INEXACT);
switch(ieee754_csr.rm) {
- case IEEE754_RN:
- case IEEE754_RZ:
+ case FPU_CSR_RN:
+ case FPU_CSR_RZ:
return ieee754dp_zero(sn);
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if (sn == 0)
return ieee754dp_min(0);
else
return ieee754dp_zero(1);
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if (sn == 0)
return ieee754dp_zero(0);
else
ieee754_setcx(IEEE754_INEXACT);
/* -O can be table indexed by (rm,sn) */
switch (ieee754_csr.rm) {
- case IEEE754_RN:
+ case FPU_CSR_RN:
return ieee754dp_inf(sn);
- case IEEE754_RZ:
+ case FPU_CSR_RZ:
return ieee754dp_max(sn);
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if (sn == 0)
return ieee754dp_inf(0);
else
return ieee754dp_max(1);
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if (sn == 0)
return ieee754dp_max(0);
else
*/
if (xm & (SP_MBIT(3) - 1)) {
switch (ieee754_csr.rm) {
- case IEEE754_RZ:
+ case FPU_CSR_RZ:
break;
- case IEEE754_RN:
+ case FPU_CSR_RN:
xm += 0x3 + ((xm >> 3) & 1);
/* xm += (xm&0x8)?0x4:0x3 */
break;
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if (!sn) /* ?? */
xm += 0x8;
break;
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if (sn) /* ?? */
xm += 0x8;
break;
ieee754_setcx(IEEE754_INEXACT);
switch(ieee754_csr.rm) {
- case IEEE754_RN:
- case IEEE754_RZ:
+ case FPU_CSR_RN:
+ case FPU_CSR_RZ:
return ieee754sp_zero(sn);
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if (sn == 0)
return ieee754sp_min(0);
else
return ieee754sp_zero(1);
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if (sn == 0)
return ieee754sp_zero(0);
else
ieee754_setcx(IEEE754_INEXACT);
/* -O can be table indexed by (rm,sn) */
switch (ieee754_csr.rm) {
- case IEEE754_RN:
+ case FPU_CSR_RN:
return ieee754sp_inf(sn);
- case IEEE754_RZ:
+ case FPU_CSR_RZ:
return ieee754sp_max(sn);
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if (sn == 0)
return ieee754sp_inf(0);
else
return ieee754sp_max(1);
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if (sn == 0)
return ieee754sp_max(0);
else
if (xs == ys)
return x;
else
- return ieee754sp_zero(ieee754_csr.rm == IEEE754_RD);
+ return ieee754sp_zero(ieee754_csr.rm == FPU_CSR_RD);
case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_ZERO):
case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_ZERO):
xs = ys;
}
if (xm == 0)
- return ieee754sp_zero(ieee754_csr.rm == IEEE754_RD);
+ return ieee754sp_zero(ieee754_csr.rm == FPU_CSR_RD);
/*
* Normalize in extended single precision
/* can't possibly be sp representable */
ieee754_setcx(IEEE754_UNDERFLOW);
ieee754_setcx(IEEE754_INEXACT);
- if ((ieee754_csr.rm == IEEE754_RU && !xs) ||
- (ieee754_csr.rm == IEEE754_RD && xs))
+ if ((ieee754_csr.rm == FPU_CSR_RU && !xs) ||
+ (ieee754_csr.rm == FPU_CSR_RD && xs))
return ieee754sp_mind(xs);
return ieee754sp_zero(xs);
if (ix != 0) {
ieee754_setcx(IEEE754_INEXACT);
switch (ieee754_csr.rm) {
- case IEEE754_RU:
+ case FPU_CSR_RU:
q += 2;
break;
- case IEEE754_RN:
+ case FPU_CSR_RN:
q += (q & 1);
break;
}
if (xs != ys)
return x;
else
- return ieee754sp_zero(ieee754_csr.rm == IEEE754_RD);
+ return ieee754sp_zero(ieee754_csr.rm == FPU_CSR_RD);
case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_ZERO):
case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_ZERO):
xs = ys;
}
if (xm == 0) {
- if (ieee754_csr.rm == IEEE754_RD)
+ if (ieee754_csr.rm == FPU_CSR_RD)
return ieee754sp_zero(1); /* round negative inf. => sign = -1 */
else
return ieee754sp_zero(0); /* other round modes => sign = 1 */
}
odd = (xm & 0x1) != 0x0;
switch (ieee754_csr.rm) {
- case IEEE754_RN:
+ case FPU_CSR_RN:
if (round && (sticky || odd))
xm++;
break;
- case IEEE754_RZ:
+ case FPU_CSR_RZ:
break;
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if ((round || sticky) && !xs)
xm++;
break;
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if ((round || sticky) && xs)
xm++;
break;
}
odd = (xm & 0x1) != 0x0;
switch (ieee754_csr.rm) {
- case IEEE754_RN:
+ case FPU_CSR_RN:
if (round && (sticky || odd))
xm++;
break;
- case IEEE754_RZ:
+ case FPU_CSR_RZ:
break;
- case IEEE754_RU: /* toward +Infinity */
+ case FPU_CSR_RU: /* toward +Infinity */
if ((round || sticky) && !xs)
xm++;
break;
- case IEEE754_RD: /* toward -Infinity */
+ case FPU_CSR_RD: /* toward -Infinity */
if ((round || sticky) && xs)
xm++;
break;