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These options are defined for the MMIX:
-mlibfuncs ¶-mno-libfuncsSpecify that intrinsic library functions are being compiled, passing allvalues in registers, no matter the size.
-mepsilon ¶-mno-epsilonGenerate floating-point comparison instructions that compare with respectto therE epsilon register.
-mabi=mmixware ¶-mabi=gnuGenerate code that passes function parameters and return values that (inthe called function) are seen as registers$0 and up, as opposed tothe GNU ABI which uses global registers$231 and up.
-mzero-extend ¶-mno-zero-extendWhen reading data from memory in sizes shorter than 64 bits, use (do notuse) zero-extending load instructions by default, rather thansign-extending ones.
-mknuthdiv ¶-mno-knuthdivMake the result of a division yielding a remainder have the same sign asthe divisor. With the default,-mno-knuthdiv, the sign of theremainder follows the sign of the dividend. Both methods arearithmetically valid, the latter being almost exclusively used.
-mtoplevel-symbols ¶-mno-toplevel-symbolsPrepend (do not prepend) a ‘:’ to all global symbols, so the assemblycode can be used with thePREFIX assembly directive.
-melf ¶Generate an executable in the ELF format, rather than the default‘mmo’ format used by themmix simulator.
-mbranch-predict ¶-mno-branch-predictUse (do not use) the probable-branch instructions, when static branchprediction indicates a probable branch.
-mbase-addresses ¶-mno-base-addressesGenerate (do not generate) code that usesbase addresses. Using abase address automatically generates a request (handled by the assemblerand the linker) for a constant to be set up in a global register. Theregister is used for one or more base address requests within the range 0to 255 from the value held in the register. The generally leads to shortand fast code, but the number of different data items that can beaddressed is limited. This means that a program that uses lots of staticdata may require-mno-base-addresses.
-msingle-exit ¶-mno-single-exitForce (do not force) generated code to have a single exit point in eachfunction.
-mset-data-start=address ¶When linking, set the start of the data section toaddress.
-mset-program-start=address ¶-mno-set-program-startWhen linking, set the program start address toaddress. Itdefaults to 0x100 unless-mno-set-program-start is used to suppressthis option entirely.
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