https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66358
--- Comment #3 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #2)
Defaulting -mlra might be reasonable for gcc 6.
For gcc 5, I thought the patch for prepare_move_operands like
diff --git a/config/sh/sh.c b/config/sh/sh.c
index 1cf6ed0..b855d70 100644
--- a/config/sh/sh.c
+++ b/config/sh/sh.c
@@ -1789,9 +1789,8 @@ prepare_move_operands (rtx operands[], machine_mode mode)
target/55212.
We split possible load/store to two move insns via r0 so as to
shorten R0 live range. It will make some codes worse but will
- win on avarage for LRA. */
- else if (sh_lra_p ()
- && TARGET_SH1 && ! TARGET_SH2A
+ win on avarage. */
+ else if (TARGET_SH1 && ! TARGET_SH2A
&& (mode == QImode || mode == HImode)
&& ((REG_P (operands[0]) && MEM_P (operands[1]))
|| (REG_P (operands[1]) && MEM_P (operands[0]))))
which would be a simplest form of the preallocating r0 for this limited case,
though I'm afraid that it's still too invasive for the release branch.
