https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104154
--- Comment #2 from rdapp at linux dot ibm.com ---
Yes, your guess was right again. We ICE here:
gcc_assert (cmode == SImode || cmode == SFmode || cmode == DFmode);
but cmode == E_CCmode with the patch.
This already helps and the resulting sequences are less expensive:
diff --git a/gcc/config/arc/arc.cc b/gcc/config/arc/arc.cc
index 8cc173519ab..d802c45f9af 100644
--- a/gcc/config/arc/arc.cc
+++ b/gcc/config/arc/arc.cc
@@ -2254,6 +2254,8 @@ gen_compare_reg (rtx comparison, machine_mode omode)
cmode = GET_MODE (x);
+ if (cmode == CCmode)
+ return comparison;
if (cmode == VOIDmode)
cmode = GET_MODE (y);
gcc_assert (cmode == SImode || cmode == SFmode || cmode == DFmode);
As we are trying to ifcvt very long sequences (5+ insns) the overall outcome
does not change, though.
