dtrace discuss - Nov 2006 - How to print out float/double arguments from arg0, arg1, ...?

I want to print out arguments of float and double type, such as from sin(),
cos(), etc.  By trial and error, I came up following macros.

        union {
                double          d64;
                float           f32[2];
                int64_t         s64;
                int32_t         s32[2];
        } VALUE;

        #define PRINT_F32_sparc(val)            \
                VALUE.s64 = val;                \
                printf("\n%s = %f\n",   \
                        "val", VALUE.f32[1]);

        #define PRINT_F32_i386(val)             \
                VALUE.s64 = val;                \
                printf("\n%s = %f\n",   \
                        "val", VALUE.f32[0]);

        #define PRINT_D64_sparc(val)            \
                VALUE.s64 = val;                \
                this->temp = VALUE.s32[0];      \
                VALUE.s32[0] = VALUE.s32[1];    \
                VALUE.s32[1] = this->temp;      \
                printf("\n%s = %f\n",           \
                        "val", VALUE.d64);

But I found they only work for 32-bit code, not 64-bit; and PRINT_F32_sparc
and PRINT_D64_sparc only work on SPARC and PRINT_F32_i386 only works on x86.

What is the right way to do this?  Is there a way can be used cross platform?

See attachments for the test code, test D script, and test output.

Thanks,

-Liang
 
 
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