https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82692
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
Component|target |rtl-optimization
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
This is the problem in the combine pass. It is substituting non-trapping
compare with trapping via SELECT_CC_MODE. This particular problem happens in
line 6788:
--cut here--
/* If this machine has CC modes other than CCmode, check to see if we
need to use a different CC mode here. */
if (GET_MODE_CLASS (GET_MODE (op0)) == MODE_CC)
compare_mode = GET_MODE (op0);
else if (inner_compare
&& GET_MODE_CLASS (GET_MODE (inner_compare)) == MODE_CC
&& new_code == old_code
&& op0 == XEXP (inner_compare, 0)
&& op1 == XEXP (inner_compare, 1))
compare_mode = GET_MODE (inner_compare);
else
compare_mode = SELECT_CC_MODE (new_code, op0, op1);
--cut here--
New compare mode should NOT change trapping of the compare insn.
