The compiler, configured with --enable-checking=yes,rtl,extra ICEs with:
internal compiler error: RTL check: expected elt 0 type 'e' or 'u',
have 'E' (rtx unspec) in try_combine, at combine.cc:3237
This is
3236 /* Just replace the CC reg with a new mode. */
3237 SUBST (XEXP (*cc_use_loc, 0), newpat_dest);
3238 undobuf.other_insn = cc_use_insn;
in combine.cc, where *cc_use_loc is
(unspec:DI [
(reg:CC 17 flags)
] UNSPEC_PUSHFL)
combine assumes CC must be used inside of a comparison and uses XEXP (..., 0)
without checking on the RTX type of the argument.
Skip the modification of CC-using operation if *cc_use_loc is not COMPARISON_P.
PR middle-end/112560
gcc/ChangeLog:
* combine.cc (try_combine): Skip the modification of CC-using
operation if *cc_use_loc is not COMPARISON_P.
Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.
OK for master?
Uros.
diff --git a/gcc/combine.cc b/gcc/combine.cc
index 6344cd3c9f2..a270138b59f 100644
--- a/gcc/combine.cc
+++ b/gcc/combine.cc
@@ -3184,11 +3184,16 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1,
rtx_insn *i0,
&& (cc_use_loc = find_single_use (SET_DEST (newpat), i3,
&cc_use_insn)))
{
- compare_code = orig_compare_code = GET_CODE (*cc_use_loc);
- if (is_a <scalar_int_mode> (GET_MODE (i2dest), &mode))
- compare_code = simplify_compare_const (compare_code, mode,
- &op0, &op1);
- target_canonicalize_comparison (&compare_code, &op0, &op1, 1);
+ if (COMPARISON_P (*cc_use_loc))
+ {
+ compare_code = orig_compare_code = GET_CODE (*cc_use_loc);
+ if (is_a <scalar_int_mode> (GET_MODE (i2dest), &mode))
+ compare_code = simplify_compare_const (compare_code, mode,
+ &op0, &op1);
+ target_canonicalize_comparison (&compare_code, &op0, &op1, 1);
+ }
+ else
+ cc_use_loc = NULL;
}
/* Do the rest only if op1 is const0_rtx, which may be the
