https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81443
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #16 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Richard, would you be OK to apply a stopgap fix for the 7.3 release?
Index: rtlanal.c
===================================================================
--- rtlanal.c (revision 256841)
+++ rtlanal.c (working copy)
@@ -4976,7 +4976,7 @@ num_sign_bit_copies1 (const_rtx x, machi
if (WORD_REGISTER_OPERATIONS
&& load_extend_op (inner_mode) == SIGN_EXTEND
&& paradoxical_subreg_p (x)
- && (MEM_P (SUBREG_REG (x)) || REG_P (SUBREG_REG (x))))
+ && MEM_P (SUBREG_REG (x)))
return cached_num_sign_bit_copies (SUBREG_REG (x), mode,
known_x, known_mode, known_ret);
break;
It's a partial reversion of my change for PR rtl-optimization/59461, hence only
a small pessimization for 64-bit WORD_REGISTER_OPERATIONS SIGN_EXTEND targets.
