[Mono-dev] Arm9 NS9215 floating point troubles

[jaekim]

There seems to be an endianness problem when the floating point value goes to
the JIT.  I used Trevor's code and changed the byte order and my problems
disappeared.

In method-to-ir.c:

                case OP_R8CONST: {
                    DVal d;
                    
                    // ORIGINAL CODE
                    //d.vald = *(double*)ins->inst_p0;
                    //MONO_EMIT_NEW_I8CONST (cfg, ins->dreg, d.vall);

                    // NEW CODE TO CHANGE ENDIANNESS

                    unsigned char *ucp = (unsigned char *) ins->inst_p0;
                    unsigned char rawval[8];
                    
                    rawval[0] = ucp[7];
                    rawval[1] = ucp[6];
                    rawval[2] = ucp[5];
                    rawval[3] = ucp[4];
                     rawval[4] = ucp[3];
                     rawval[5] = ucp[2];
                    rawval[6] = ucp[1];
                    rawval[7] = ucp[0];

                    d.vald = *(double*)rawval;

                    MONO_EMIT_NEW_I8CONST (cfg, ins->dreg, d.vall);

                    break;
                }
                case OP_R4CONST: {
                    DVal d;

                    // ORIGINAL CODE
                    /* We load the r8 value */
                    //d.vald = *(float*)ins->inst_p0;
                    //MONO_EMIT_NEW_I8CONST (cfg, ins->dreg, d.vall);

                    // NEW CODE TO CHANGE ENDIANNESS

                    unsigned char *ucp = (unsigned char *) ins->inst_p0;
                    unsigned char rawval[4];
                    rawval[0] = ucp[3];
                    rawval[1] = ucp[2];
                    rawval[2] = ucp[1];
                    rawval[3] = ucp[0];
                    d.vald = *(double*)rawval;

                    MONO_EMIT_NEW_I8CONST (cfg, ins->dreg, d.vall);
                    break;
                }

Thanks Trevor!
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