Assembler options

The MIPS configurations of GNU as support these special options:

-G num

This option sets the largest size of an object that can be referenced implicitly with the gp register. It is only accepted for targets that use ECOFF format. The default value is 8.

-EB

-EL

Any MIPS configuration of as can select big-endian or little-endian output at run time (unlike the other GNU development tools, which must be configured for one or the other). Use `-EB' to select big-endian output, and `-EL' for little-endian.

-mips1

-mips2

-mips3

Generate code for a particular MIPS Instruction Set Architecture level. `-mips1' corresponds to the R2000 and R3000 processors, `-mips2' to the R6000 processor, and `-mips3' to the R4000 processor. You can also switch instruction sets during the assembly; see section Directives to override the ISA level.

-m4650

-no-m4650

Generate code for the MIPS R4650 chip. This tells the assembler to accept the `mad' and `madu' instruction, and to not schedule `nop' instructions around accesses to the `HI' and `LO' registers. `-no-m4650' turns off this option.

-m4010

-no-m4010

Generate code for the LSI R4010 chip. This tells the assembler to accept the R4010 specific instructions (`addciu', `ffc', etc.), and to not schedule `nop' instructions around accesses to the `HI' and `LO' registers. `-no-m4010' turns off this option.

-mcpu=CPU

Generate code for a particular MIPS cpu. This has little effect on the assembler, but it is passed by gcc.

-nocpp

This option is ignored. It is accepted for command-line compatibility with other assemblers, which use it to turn off C style preprocessing. With GNU as, there is no need for `-nocpp', because the GNU assembler itself never runs the C preprocessor.

--trap

--no-break

as automatically macro expands certain division and multiplication instructions to check for overflow and division by zero. This option causes as to generate code to take a trap exception rather than a break exception when an error is detected. The trap instructions are only supported at Instruction Set Architecture level 2 and higher.

--break

--no-trap

Generate code to take a break exception rather than a trap exception when an error is detected. This is the default.