PDP-11 Options (Using the GNU Compiler Collection (GCC)) (original) (raw)

3.20.37 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.