https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113010
Greg McGary <gkm at rivosinc dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|DUPLICATE |---
--- Comment #3 from Greg McGary <gkm at rivosinc dot com> ---
This fixes it, though I would like second look from someone more familiar with
the combiner:
diff --git a/gcc/combine.cc b/gcc/combine.cc
index 812553c091e..cd159db2a33 100644
--- a/gcc/combine.cc
+++ b/gcc/combine.cc
@@ -7208,6 +7208,10 @@ expand_compound_operation (rtx x)
if (len == 0)
return x;
+ /* Sign-extending loads can never be simplified at compile time. */
+ if (MEM_P (XEXP (x, 0)) && load_extend_op (inner_mode) == SIGN_EXTEND)
+ return x;
+
break;
case ZERO_EXTRACT:
