Hi,
PR72855 reports a compile-time problem with df_verify being called once per
loop.
The compile time drops from about 2 hours to 9 minutes for the reported test
case
when we disable the DF_VERIFY_SCHEDULED flag after df_verify runs. That's all
this patch does.
Bin Cheng has a separate patch to factor some code in loop-doloop.c that will
also
provide benefit.
There is a separate issue that this compile-time problem should not occur at all
with release checking, and yet it is. That is still under investigation.
Bootstrapped and tested on powerpc64le-unknown-linux-gnu with no regressions.
Preapproved, committed.
Thanks,
Bill
2016-08-11 Richard Biener <rguent...@suse.de>
Bill Schmidt <wschm...@linux.vnet.ibm.com>
PR rtl-optimization/72855
* df-core.c (df_verify): Turn off DF_VERIFY_SCHEDULED at end.
Index: gcc/df-core.c
===================================================================
--- gcc/df-core.c (revision 239394)
+++ gcc/df-core.c (working copy)
@@ -1833,6 +1833,7 @@ df_verify (void)
if (df_live)
df_live_verify_transfer_functions ();
#endif
+ df->changeable_flags &= ~DF_VERIFY_SCHEDULED;
}
#ifdef DF_DEBUG_CFG
