Hi, I figured I'd just go ahead and post this patch as well since it seems to have fixed the arc build problems.
It would be nice if someone could bootstrap/regtest if Jeff hasn't already done so. I was able to verify that the two testcases attached to the PR build cleanly but not much more. Thank you. Regards Robin -- PR104154 gcc/ChangeLog: * config/arc/arc.cc (gen_compare_reg): Return the CC-mode comparison ifcvt passed us. --- >From fa98a40abd55e3a10653f6a8c5b2414a2025103b Mon Sep 17 00:00:00 2001 From: Robin Dapp <rd...@linux.ibm.com> Date: Mon, 7 Feb 2022 08:39:41 +0100 Subject: [PATCH] arc: Fix for new ifcvt behavior [PR104154] ifcvt now passes a CC-mode "comparison" to backends. This patch simply returns from gen_compare_reg () in that case since nothing needs to be prepared anymore. PR104154 gcc/ChangeLog: * config/arc/arc.cc (gen_compare_reg): Return the CC-mode comparison ifcvt passed us. --- gcc/config/arc/arc.cc | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/gcc/config/arc/arc.cc b/gcc/config/arc/arc.cc index 8cc173519ab..5e40ec2c04d 100644 --- a/gcc/config/arc/arc.cc +++ b/gcc/config/arc/arc.cc @@ -2254,6 +2254,12 @@ gen_compare_reg (rtx comparison, machine_mode omode) cmode = GET_MODE (x); + + /* If ifcvt passed us a MODE_CC comparison we can + just return it. It should be in the proper form already. */ + if (GET_MODE_CLASS (cmode) == MODE_CC) + return comparison; + if (cmode == VOIDmode) cmode = GET_MODE (y); gcc_assert (cmode == SImode || cmode == SFmode || cmode == DFmode); -- 2.31.1