/* 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;