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These options are defined for the PDP-11:
-mfpuUse hardware FPP floating point. This is the default. (FIS floating point on the PDP-11/40 is not supported.)
-msoft-floatDo not use hardware floating point.
-mac0Return floating-point results in ac0 (fr0 in Unix assembler syntax).
-mno-ac0Return floating-point results in memory. This is the default.
-m40Generate code for a PDP-11/40.
-m45Generate code for a PDP-11/45. This is the default.
-m10Generate code for a PDP-11/10.
-mbcopy-builtinUse inline movmemhi patterns for copying memory. This is the
default.
-mbcopyDo not use inline movmemhi patterns for copying memory.
-mint16-mno-int32Use 16-bit int. This is the default.
-mint32-mno-int16Use 32-bit int.
-mfloat64-mno-float32Use 64-bit float. This is the default.
-mfloat32-mno-float64Use 32-bit float.
-mabshiUse abshi2 pattern. This is the default.
-mno-abshiDo not use abshi2 pattern.
-mbranch-expensivePretend that branches are expensive. This is for experimenting with code generation only.
-mbranch-cheapDo not pretend that branches are expensive. This is the default.
-munix-asmUse Unix assembler syntax. This is the default when configured for ‘pdp11-*-bsd’.
-mdec-asmUse DEC assembler syntax. This is the default when configured for any PDP-11 target other than ‘pdp11-*-bsd’.
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