This turns on -mlra per default on avr.
Ok for trunk?
Johann
--
AVR: target/113934 - Use LRA per default.
Now that the patches for PR120424 are upstream, the last known bug
associated with avr+lra has been fixed: PR118591. So we can pull the
switch that turns on LRA per default.
This patch only sets -mlra per default. It doesn't do any Reload related
cleanup or removal from the avr backend, hence -mno-lra still works.
The only new problem is that gcc.dg/torture/pr64088.c fails with LRA
but not with Reload. Though that test case is awkward since it is UB
but expects the compiler to behave in a specific way which avr-gcc
doesn't do: PR116780.
This patch also avoids a relative recent ICE that breaks building libgcc:
R24:DI is allowed per hard_regno_mode_ok, but R26:SI is disallowed
for Reload for old reasons. Outcome is that a split2 pattern for
R24:DI = zero_extend:DI (R22:SI) runs into an ICE.
AVR-LibC builds fine with this patch.
The AVR-LibC testsuite passes without errors.
gcc/
PR target/113934
* config/avr/avr.opt (-mlra): Turn on per default.
diff --git a/gcc/config/avr/avr.opt b/gcc/config/avr/avr.opt
index fcd2bf68f2a..988311927bd 100644
--- a/gcc/config/avr/avr.opt
+++ b/gcc/config/avr/avr.opt
@@ -19,8 +19,8 @@
; <http://www.gnu.org/licenses/>.
mlra
-Target Var(avropt_lra_p) UInteger Init(0) Optimization Undocumented
-Usa LRA for reload instead of the old reload framework. This option is
experimental, and it may be removed in future versions of the compiler.
+Target Var(avropt_lra_p) UInteger Init(1) Optimization Undocumented
+Usa LRA for reload instead of the old reload framework. This option is
experimental, on per default, and it may be removed in future versions
of the compiler.
mcall-prologues
Target Mask(CALL_PROLOGUES) Optimization
