PDP-11 Options

These options are defined for the PDP-11:

-mfpu

Use hardware FPP floating point. This is the default. (FIS floating point on the PDP-11/40 is not supported.) Implies -m45.

-msoft-float

Do not use hardware floating point.

-mac0

Return floating-point results in ac0 (fr0 in Unix assembler syntax).

-mno-ac0

Return floating-point results in memory. This is the default.

-m40

Generate code for a PDP-11/40. Implies -msoft-float -mno-split.

-m45

Generate code for a PDP-11/45. This is the default.

-m10

Generate code for a PDP-11/10. Implies -msoft-float -mno-split.

-mint16, -mno-int32

Use 16-bit int. This is the default.

-mint32, -mno-int16

Use 32-bit int.

-msplit

Target has split instruction and data space. Implies -m45.

-munix-asm

Use Unix assembler syntax.

-mdec-asm

Use DEC assembler syntax.

-mgnu-asm

Use GNU assembler syntax. This is the default.

-mlra

Use the new LRA register allocator. By default, the old ‘reload’ allocator is used.