gcc/config/mips/iris4loser.h - gcc - Git at Google

 /* Like iris4.h, but always inhibits assembler optimization for MIPS as.
    Use this via mips-sgi-iris4loser if you need it.  */

 #define SUBTARGET_MIPS_AS_ASM_SPEC "-O0 %{v}"
 #define SUBTARGET_ASM_OPTIMIZING_SPEC ""
	/* Like iris4.h, but always inhibits assembler optimization for MIPS as.
	Use this via mips-sgi-iris4loser if you need it. */

	#define SUBTARGET_MIPS_AS_ASM_SPEC "-O0 %{v}"
	#define SUBTARGET_ASM_OPTIMIZING_SPEC ""