Chapter 2. Overview

13

 mfix7000

 mno fix7000

Cause nops to be inserted if the read of the destination register of an mfhi or mflo instruction

occurs in the following two instructions.

 mdebug

 no mdebug

Cause stabs style debugging output to go into an ECOFF style .mdebug section instead of the

standard ELF .stabs sections.

 mpdr

 mno pdr

Control generation of

.pdr

sections.

 mgp32

 mfp32

The register sizes are normally inferred from the ISA and ABI, but these flags force a certain

group of registers to be treated as 32 bits wide at all times.

 mgp32

controls the size of general 

purpose registers and

 mfp32

controls the size of floating point registers.

 mips16

 no mips16

Generate code for the MIPS 16 processor. This is equivalent to putting

.set mips16

at the start

of the assembly file.

 no mips16

turns off this option.

 mips3d

 no mips3d

Generate code for the MIPS 3D Application Specific Extension. This tells the assembler to ac 

cept MIPS 3D instructions.

 no mips3d

turns off this option.

 mdmx

 no mdmx

Generate code for the MDMX Application Specific Extension. This tells the assembler to accept

MDMX instructions.

 no mdmx

turns off this option.

 construct floats

 no construct floats

The

 no construct floats

option disables the construction of double width floating point

constants by loading the two halves of the value into the two single width floating point registers

that make up the double width register. By default

 construct floats

is selected, allowing

construction of these floating point constants.

 emulation=name

This option causes

as

to emulate

as

configured for some other target, in all respects, including

output format (choosing between ELF and ECOFF only), handling of pseudo opcodes which

may generate debugging information or store symbol table information, and default endianness.

The available configuration names are:

mipsecoff

,

mipself

,

mipslecoff

,

mipsbecoff

,

mipslelf

,

mipsbelf

. The first two do not alter the default endianness from that of the pri 

mary target for which the assembler was configured; the others change the default to little  or

big endian as indicated by the

b

or

l

in the name. Using

 EB

or

 EL

will override the endianness

selection in any case.