On Wed, 2013-05-22 at 07:30 +0100, Richard Sandiford wrote:
> Oops -- only if someone submitted one :-) So we should definitely
> change the mips32r2 entry. I'd suggest one of PROCESSOR_24KF* or
> PROCESSOR_74KF*, so that we get the FPU scheduling, but I don't know
> which would be more representative of the general case. TUNE_74*
> has quite a lot of special code associated with it, whereas TUNE_24*
> sets TUNE_MACC_CHAINS, which might overemphasise the use of MADD
> for 74k targets when -mimadd is used.
>
> But any choice is going to be a compromise. A patch to do either
> is preapproved.
>
> Thanks,
> Richard
OK, I did some testing and benchmarking and did not find a clear best
choice so I think I will go with PROCESSOR_74KF2_1. Here is the patch
I will check in shortly:
2013-05-28 Steve Ellcey <sell...@mips.com>
* config/mips/mips-cpus.def (mips32r2): Change processor type.
diff --git a/gcc/config/mips/mips-cpus.def
b/gcc/config/mips/mips-cpus.def
index 9e5fd16..f08fad6 100644
--- a/gcc/config/mips/mips-cpus.def
+++ b/gcc/config/mips/mips-cpus.def
@@ -43,7 +43,7 @@ MIPS_CPU ("mips4", PROCESSOR_R8000, 4, 0)
that to a recommendation to avoid the instructions in code that
isn't tuned to a specific processor. */
MIPS_CPU ("mips32", PROCESSOR_4KC, 32, PTF_AVOID_BRANCHLIKELY)
-MIPS_CPU ("mips32r2", PROCESSOR_M4K, 33, PTF_AVOID_BRANCHLIKELY)
+MIPS_CPU ("mips32r2", PROCESSOR_74KF2_1, 33, PTF_AVOID_BRANCHLIKELY)
MIPS_CPU ("mips64", PROCESSOR_5KC, 64, PTF_AVOID_BRANCHLIKELY)
/* ??? For now just tune the generic MIPS64r2 for 5KC as well. */
MIPS_CPU ("mips64r2", PROCESSOR_5KC, 65, PTF_AVOID_BRANCHLIKELY)
