---

3.21.34 NDS32 Options ¶

These options are defined for NDS32 implementations:

-mbig-endian ¶

-EB

Generate code in big-endian mode.

-mlittle-endian ¶

-EL

Generate code in little-endian mode.

-mabi=2 ¶

-mfloat-abi=soft

Use the soft floating-point ABI.

-mabi=2fp+

-mfloat-abi=hard

Use the hard floating-point ABI.

-mreduced-regs ¶

Use reduced-set registers for register allocation.

-mfull-regs ¶

Use full-set registers for register allocation.

-malways-align ¶

Always align function entry, jump targets, and return address.

-malign-functions ¶

Align function entry to 4 bytes.

-mfp-as-gp ¶

-mno-fp-as-gp

Enable/disable fp-as-gp optimization.

-mcmov ¶

-mno-cmov

Enable/disable generation of conditional move instructions.

-mhw-abs ¶

-mno-hw-abs

Enable/disable generation of hardware abs instructions.

-mext-perf ¶

-mno-ext-perf

Enable/disable generation of performance extension instructions.

-mext-perf2 ¶

-mno-ext-perf2

Enable/disable generation of performance extension 2 instructions.

-mext-string ¶

-mno-ext-string

Enable/disable generation of string extension instructions.

-mext-dsp ¶

-mno-ext-dsp

Enable/disable generation of DSP extension instructions.

-mext-fpu-fma ¶

-mno-ext-fpu-fma

Enable/disable generation of floating-point multiply-accumulation instructions.

-mext-fpu-sp ¶

-mno-ext-fpu-sp

Enable/disable generation of single-precision floating-point instructions.

-mext-fpu-dp ¶

-mno-ext-fpu-dp

Enable/disable generation of double-precision floating-point instructions.

-mv3push ¶

-mno-v3push

Enable/disable generation of v3 push25/pop25 instructions.

-m16-bit ¶

-mno-16-bit

Enable/disable generation of 16-bit instructions.

-mvh ¶

-mno-vh

Enable/disable Virtual Hosting support.

-misr-vector-size=num ¶

Specify the size of each interrupt vector, which must be 4 or 16.

-misr-secure=num ¶

Specify the security level of c-isr for the whole file.

-mcache-block-size=num ¶

Specify the size of each cache block, which must be a power of 2 between 4 and 512.

-march=arch ¶

Specify the target architecture. arch may be one of ‘v2’, ‘v3’, ‘v3j’, ‘v3m’, ‘v3f’, or ‘v3s’.

-mcpu=cpu ¶

Specify the CPU to compile for. cpu may be one of ‘n6’, ‘n650’, ‘n7’, ‘n705’, ‘n8’, ‘n801’, ‘sn8’, ‘sn801’, ‘s8’, ‘s801’, ‘e8’, ‘e801’, ‘n820’, ‘s830’, ‘e830’, ‘n9’, ‘n903’, ‘n903a’, ‘n968’, ‘n968a’, ‘n10’, ‘n1033’, ‘n1033a’, ‘n1033-fpu’, ‘n1033-spu’, ‘n1068’, ‘n1068a’, ‘n1068-fpu’, ‘n1068a-fpu’, ‘d10’, ‘d1088’, ‘d1088-fpu’, ‘d1088-spu’, ‘n15’, ‘d15’, ‘n15s’, ‘d15s’, ‘n15f’, ‘d15f’, ‘n12’, ‘n1213’, ‘n1233’, ‘n1233-fpu’, ‘n1233-spu’, ‘n13’, ‘n1337’, ‘n1337-fpu’, ‘n1337-spu’, or ‘simple’.

-mconfig-fpu=num ¶

Specify a FPU configuration value from 0 to 7; 0–3 is as FPU spec says, and 4–7 correspond to 0–3.

-mconfig-mul=type ¶

Specify configuration for multiply instruction. type can be one of ‘fast’, ‘fast1’ (equivalent to ‘fast’), ‘fast2’, or ‘slow’. The default is ‘fast1’.

-mconfig-register-ports=kind ¶

Specify the numbers of read/write ports for n9/n10 cores. The value should be ‘3r2w’ or ‘2r1w’.

-mcmodel=code-model ¶

Set the code model to one of:

‘small’

All the data and read-only data segments must be within 512KB addressing space. The text segment must be within 16MB addressing space.

‘medium’

The data segment must be within 512KB while the read-only data segment can be within 4GB addressing space. The text segment should be still within 16MB addressing space.

‘large’

All the text and data segments can be within 4GB addressing space.

The default is ‘large’ on GNU/Linux targets and ‘medium’ on other ELF targets.

-mctor-dtor ¶

-mno-ctor-dtor

Enable/disable constructor/destructor feature.

-mrelax ¶

-mno-relax

Enable/disable linker option to relax instructions.

-mrelax-hint ¶

-mno-relax-hint

Enable/disable insertion of hints for linker to do relaxation.

-msched-prolog-epilog ¶

-mno-sched-prolog-epilog

Enable/disable scheduling of a function’s prologue and epilogue sequence.

-mret-in-naked-func ¶

-mno-ret-in-naked-func

Enable/disable generation of return instructions in naked functions. This option is enabled by default.

-malways-save-lp ¶

-mno-always-save-lp

Enable/disable always saving $lp on the stack.

-munaligned-access ¶

-mno-unaligned-access

Enable/disable unaligned word and halfword accesses to packed data.

-minline-asm-r15 ¶

-mno-inline-asm-r15

Allow/disallow use of r15 for inline asm.