===================================================================
@@ -711,6 +711,13 @@ along with GCC; see the file COPYING3.
register window instruction in the prologue. */
#define HARD_REGNO_RENAME_OK(FROM, TO) ((FROM) != 1)
+/* Select a register mode required for caller save of hard regno REGNO.
+ Contrary to what is documented, the default is not the smallest suitable
+ mode but the largest suitable mode for the given (REGNO, NREGS) pair and
+ it quickly creates paradoxical subregs that can be problematic. */
+#define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
+ ((MODE) == VOIDmode ? choose_hard_reg_mode (REGNO, NREGS, false) : (MODE))
+
/* Specify the registers used for certain standard purposes.
The values of these macros are register numbers. */