Notes
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When compiling for IA64, MLton targets the 64-bit ABI.
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When compiling for IA64, MLton doesn't support native code generation (-codegen native). Hence, performance is not as good as it might be and compile times are longer. Also, the quality of code generated by gcc is important. By default, MLton calls gcc -O1. You can change this by calling MLton with -cc-opt -O2.
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When compiling for IA64, MLton uses -align 8 by default.
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On the IA64, the GnuMP library supports multiple ABIs. See the GnuMP page for more details.