c28 D10V_options Contents|Index|Previous|Next

D10V options

These ‘-m’ options are defined for the D10V implementations.

-mint32

-mint16

Make int data 32 (or 16) bits by default. The default is ‘-mint16’.

-mdouble64

-mdouble32

Make double data 64 (or 32) bits by default. The default is ‘-mdouble32’.

-maddac3

-mno-addac3

Enable (disable) the use of addac3 and subac3 instructions. The ‘-maddac3’ instruction also enables the ‘-maccum’ instruction.

-maccum

-mno-accum

Enable (disable) the use of the 32-bit accumulators in compiler generated code.

-mno-asm-optimize

-masm-optimize

Disable (enable) passing ‘-O’ to the assembler when optimizing. The assembler uses the ‘-O’ option to automatically parallelize adjacent short instructions where possible.

-mno-small-insns

-msmall-insns

Disable (enable) converting some long instructions into two short instructions, which can eliminate some nops and enable more code to be conditionally executed.

-mno-cond-move

-mcond-move

Disable (or enable) conditional move instructions, eliminating short branches.

-mbranch-cost=n

Increase the internal costs of branches to n. Higher costs means that the compiler will issue more instructions to avoid doing a branch. The default is 1.

-mcond-exec=n

Specify the maximum number of conditionally executed instructions that replace a branch. The default is 4.