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Fortran Switch Differences
The 32-bit compiler supports the following switches which the 64-bit compiler does not:
- -32
- By definition.
- -mips1
- Generate code using the MIPS1 instruction set (the default for the 32-bit compiler).
- -mips2
- Generate code using the MIPS2 instruction set.
- -66
- Suppress extensions that enhance FORTRAN 66 compatibility.
- -w66
- Suppress only FORTRAN 66 compatibility warnings messages.
- -usefpidx
- Force the compiler to use the floating point DO loop variable as the loop counter.
The 64-bit compiler supports the following switches which the 32-bit compiler does not:
- -64
- By definition.
- -n32
- Generate code for the high performance 32-bit (N32) ABI.
- -mips3
- Generate code using the MIPS3 instruction set.
- -mips4
- Generate code using the MIPS4 instruction set ( the default for the 64-bit compiler on Power Challenge ).
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