Re: Failure to optimise (a/b) and (a%b) into single __aeabi_idivmod call

On 6 June 2013 12:09, Kugan kugan.vivekanandarajah@linaro.org wrote:

On 05/06/13 21:27, Matthew Gretton-Dann wrote:

...

Kugan,

I don't have the source code to hand but how are the sin()/cos()->sincos() optimizations handled?

Thanks Matt. There is a tree level pass to combine sin()/cos() into sincos(). Commit that added this is: http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=121052. We can try doing same thing similar here.

Is there anyway we can know in the tree level that the target does not define integer divide?

Some targets, e.g. MIPS, have a combined div/mod instruction. Those could benefit from this as well, unless they already achieve that optimisation differently.