3.17.24 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.)
-
-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.
-
-m45
-
Generate code for a PDP-11/45. This is the default.
-
-m10
-
Generate code for a PDP-11/10.
-
-mbcopy-builtin
-
Use inline
movmemhi
patterns for copying memory. This is the default.
-
-mbcopy
-
Do not use inline
movmemhi
patterns for copying memory.
-
-mint16
-
-mno-int32
-
Use 16-bit
int
. This is the default.
-
-mint32
-
-mno-int16
-
Use 32-bit
int
.
-
-mfloat64
-
-mno-float32
-
Use 64-bit
float
. This is the default.
-
-mfloat32
-
-mno-float64
-
Use 32-bit
float
.
-
-mabshi
-
Use
abshi2
pattern. This is the default.
-
-mno-abshi
-
Do not use
abshi2
pattern.
-
-mbranch-expensive
-
Pretend that branches are expensive. This is for experimenting with code generation only.
-
-mbranch-cheap
-
Do not pretend that branches are expensive. This is the default.
-
-msplit
-
Generate code for a system with split I&D.
-
-mno-split
-
Generate code for a system without split I&D. This is the default.
-
-munix-asm
-
Use Unix assembler syntax. This is the default when configured for `
pdp11-*-bsd
'.
-
-mdec-asm
- Use DEC assembler syntax. This is the default when configured for any PDP-11 target other than ` pdp11-*-bsd '.