arc: Remove mlra option [PR113954]

The target dependent mlra option was designed to be able to quickly
switch between LRA and reload.  The reload register allocator step is
scheduled for retirement, thus, remove the functionality of mlra,
keeping it for backward compatibility.

	PR target/113954

gcc/ChangeLog:

	* config/arc/arc.cc (TARGET_LRA_P): Always return true.
	(arc_lra_p): Remove.
	* config/arc/arc.h (TARGET_LRA): Remove.
	* config/arc/arc.opt (mlra): Change it to do nothing.
	* doc/invoke.texi (mlra): Update option description.

Signed-off-by: Claudiu Zissulescu <claziss@gmail.com>

diff --git a/gcc/config/arc/arc.cc b/gcc/config/arc/arc.cc
index c800226b179b1025eb8c721e915106e7e900dec0..a225adeff5738ab41fbe92fd3e9cb5872498eaeb 100644 (file)
--- a/gcc/config/arc/arc.cc
+++ b/gcc/config/arc/arc.cc
@@ -721,7 +721,7 @@ static rtx arc_legitimize_address_0 (rtx, rtx, machine_mode mode);
   arc_no_speculation_in_delay_slots_p
 
 #undef TARGET_LRA_P
-#define TARGET_LRA_P arc_lra_p
+#define TARGET_LRA_P hook_bool_void_true
 #define TARGET_REGISTER_PRIORITY arc_register_priority
 /* Stores with scaled offsets have different displacement ranges.  */
 #define TARGET_DIFFERENT_ADDR_DISPLACEMENT_P hook_bool_void_true
@@ -10156,14 +10156,6 @@ arc_eh_uses (int regno)
   return false;
 }
 
-/* Return true if we use LRA instead of reload pass.  */
-
-bool
-arc_lra_p (void)
-{
-  return arc_lra_flag;
-}
-
 /* ??? Should we define TARGET_REGISTER_PRIORITY?  We might perfer to
    use q registers, because some insn are shorter with them.  OTOH we
    already have separate alternatives for this purpose, and other

diff --git a/gcc/config/arc/arc.h b/gcc/config/arc/arc.h
index 0a1ecb71d893816fe46588498a307ecd5d92eb87..4cadef7a2b2b75a3edd8fb50acdd2e23776841cb 100644 (file)
--- a/gcc/config/arc/arc.h
+++ b/gcc/config/arc/arc.h
@@ -1660,8 +1660,4 @@ enum
 /* The default option for BI/BIH instructions.  */
 #define DEFAULT_BRANCH_INDEX 0
 
-#ifndef TARGET_LRA
-#define TARGET_LRA arc_lra_p()
-#endif
-
 #endif /* GCC_ARC_H */

diff --git a/gcc/config/arc/arc.opt b/gcc/config/arc/arc.opt
index 5abb2977626d8170c79f78a53ff8749eae672555..7b9318335bec01d9886d5724f6a314aba636953f 100644 (file)
--- a/gcc/config/arc/arc.opt
+++ b/gcc/config/arc/arc.opt
@@ -401,8 +401,8 @@ Pass -marclinux_prof option through to linker.
 
 ;; lra is still unproven for ARC, so allow to fall back to reload with -mno-lra.
 mlra
-Target Var(arc_lra_flag) Init(1) Save
-Use LRA instead of reload.
+Target Ignore
+Does nothing.  Preserved for backward compatibility.
 
 mlra-priority-none
 Target RejectNegative Var(arc_lra_priority_tag, ARC_LRA_PRIORITY_NONE)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 032adfff5fc5fdc5fb050d51911330f4bed861a3..7e4f0ca7a6206ef602f014999639452e2936f0c1 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -22716,9 +22716,7 @@ the case.
 
 @opindex mlra
 @item -mlra
-Enable Local Register Allocation.  This is still experimental for ARC,
-so by default the compiler uses standard reload
-(i.e.@: @option{-mno-lra}).
+Does nothing.  Preserved for backward compatibility.
 
 @opindex mlra-priority-none
 @item -mlra-priority-none