The PR89115 spends ~66% of its compile-time in LRA reload inheritance
because of a weak hash and a lot of collisions in the invaraints hash.
This can be fixed by the following, bringing down inheritance time
to the noise.
Bootstrap / regtest running on x86_64-unknown-linux-gnu, OK for trunk
(and branches?)?
The hash function is still weak but w/o a testcase I don't think
it's worth slowing it down further.
Thanks,
Richard.
2019-01-30 Richard Biener <rguent...@suse.de>
PR rtl-optimization/89115
* lra.c (lra_rtx_hash): Properly hash CONST_INT values.
Index: gcc/lra.c
===================================================================
--- gcc/lra.c (revision 268383)
+++ gcc/lra.c (working copy)
@@ -1719,10 +1719,12 @@ lra_rtx_hash (rtx x)
case SCRATCH:
case CONST_DOUBLE:
- case CONST_INT:
case CONST_VECTOR:
return val;
+ case CONST_INT:
+ return val + UINTVAL (x);
+
default:
break;
}
