info gcc

3.17.12 FRV Options

-mgpr-32

Only use the first 32 general-purpose registers.

-mgpr-64

Use all 64 general-purpose registers.

-mfpr-32

Use only the first 32 floating-point registers.

-mfpr-64

Use all 64 floating-point registers.

-mhard-float

Use hardware instructions for floating-point operations.

-msoft-float

Use library routines for floating-point operations.

-malloc-cc

Dynamically allocate condition code registers.

-mfixed-cc

Do not try to dynamically allocate condition code registers, only use icc0 and fcc0.

-mdword

Change ABI to use double word insns.

-mno-dword

Do not use double word instructions.

-mdouble

Use floating-point double instructions.

-mno-double

Do not use floating-point double instructions.

-mmedia

Use media instructions.

-mno-media

Do not use media instructions.

-mmuladd

Use multiply and add/subtract instructions.

-mno-muladd

Do not use multiply and add/subtract instructions.

-mfdpic

Select the FDPIC ABI, which uses function descriptors to represent pointers to functions. Without any PIC/PIE-related options, it implies ‘-fPIE’. With ‘-fpic’ or ‘-fpie’, it assumes GOT entries and small data are within a 12-bit range from the GOT base address; with ‘-fPIC’ or ‘-fPIE’, GOT offsets are computed with 32 bits. With a ‘bfin-elf’ target, this option implies ‘-msim’.

-minline-plt

Enable inlining of PLT entries in function calls to functions that are not known to bind locally. It has no effect without ‘-mfdpic’. It’s enabled by default if optimizing for speed and compiling for shared libraries (i.e., ‘-fPIC’ or ‘-fpic’), or when an optimization option such as ‘-O3’ or above is present in the command line.

-mTLS

Assume a large TLS segment when generating thread-local code.

-mtls

Do not assume a large TLS segment when generating thread-local code.

-mgprel-ro

Enable the use of GPREL relocations in the FDPIC ABI for data that is known to be in read-only sections. It’s enabled by default, except for ‘-fpic’ or ‘-fpie’: even though it may help make the global offset table smaller, it trades 1 instruction for 4. With ‘-fPIC’ or ‘-fPIE’, it trades 3 instructions for 4, one of which may be shared by multiple symbols, and it avoids the need for a GOT entry for the referenced symbol, so it’s more likely to be a win. If it is not, ‘-mno-gprel-ro’ can be used to disable it.

-multilib-library-pic

Link with the (library, not FD) pic libraries. It’s implied by ‘-mlibrary-pic’, as well as by ‘-fPIC’ and ‘-fpic’ without ‘-mfdpic’. You should never have to use it explicitly.

-mlinked-fp

Follow the EABI requirement of always creating a frame pointer whenever a stack frame is allocated. This option is enabled by default and can be disabled with ‘-mno-linked-fp’.

-mlong-calls

Use indirect addressing to call functions outside the current compilation unit. This allows the functions to be placed anywhere within the 32-bit address space.

-malign-labels

Try to align labels to an 8-byte boundary by inserting NOPs into the previous packet. This option only has an effect when VLIW packing is enabled. It doesn’t create new packets; it merely adds NOPs to existing ones.

-mlibrary-pic

Generate position-independent EABI code.

-macc-4

Use only the first four media accumulator registers.

-macc-8

Use all eight media accumulator registers.

-mpack

Pack VLIW instructions.

-mno-pack

Do not pack VLIW instructions.

-mno-eflags

Do not mark ABI switches in e_flags.

-mcond-move

Enable the use of conditional-move instructions (default).