[ARC] Use -G option to control sdata behavior

gcc/
2017-04-24  Claudiu Zissulescu  <claziss@synopsys.com>

	* config.gcc: Use g.opt for arc.
	* config/arc/arc.c (LEGITIMATE_SCALED_ADDRESS_P): Deleted,
	functionality moved to ...
	(legitimate_scaled_address_p): New function, ...here.
	(LEGITIMATE_SMALL_DATA_OFFSET_P): New define.
	(LEGITIMATE_SMALL_DATA_ADDRESS_P): Use the above define.
	(legitimate_offset_address_p): Delete TARGET_NO_SDATA_SET
	condition.
	(arc_override_options): Handle G option.
	(arc_output_pic_addr_const): Correct function definition.
	(arc_legitimate_address_p): Use legitimate_scaled_address_p.
	(arc_decl_anon_ns_mem_p): Delete.
	(arc_in_small_data_p): Overhaul this function to take into
	consideration the value given via G option.
	(arc_rewrite_small_data_1): Renamed and corrected old
	arc_rewrite_small_data function.
	(arc_rewrite_small_data): New function.
	(small_data_pattern): Don't use pic_offset_table_rtx.
	* config/arc/arc.h (CC1_SPEC): Recognize G option.
	* config/arc/simdext.md (movmisalignv2hi): Use
	prepare_move_operands function.
	(mov*): Likewise.
	(movmisalign*): Likewise.

gcc/testsuite/
2017-04-24  Claudiu Zissulescu  <claziss@synopsys.com>

	* gcc.target/arc/sdata-5.c: New test.
	* gcc.target/arc/arc700-stld-hazard.c: Update test options.

Fix test

From-SVN: r251564

gcc/ChangeLog

 2017-08-31  Claudiu Zissulescu  <claziss@synopsys.com>
 
+	* config.gcc: Use g.opt for arc.
+	* config/arc/arc.c (LEGITIMATE_SCALED_ADDRESS_P): Deleted,
+	functionality moved to ...
+	(legitimate_scaled_address_p): New function, ...here.
+	(LEGITIMATE_SMALL_DATA_OFFSET_P): New define.
+	(LEGITIMATE_SMALL_DATA_ADDRESS_P): Use the above define.
+	(legitimate_offset_address_p): Delete TARGET_NO_SDATA_SET
+	condition.
+	(arc_override_options): Handle G option.
+	(arc_output_pic_addr_const): Correct function definition.
+	(arc_legitimate_address_p): Use legitimate_scaled_address_p.
+	(arc_decl_anon_ns_mem_p): Delete.
+	(arc_in_small_data_p): Overhaul this function to take into
+	consideration the value given via G option.
+	(arc_rewrite_small_data_1): Renamed and corrected old
+	arc_rewrite_small_data function.
+	(arc_rewrite_small_data): New function.
+	(small_data_pattern): Don't use pic_offset_table_rtx.
+	* config/arc/arc.h (CC1_SPEC): Recognize G option.
+	* config/arc/simdext.md (movmisalignv2hi): Use
+	prepare_move_operands function.
+	(mov*): Likewise.
+	(movmisalign*): Likewise.
+	* doc/invoke.texi (ARC options): Document -G option.
+
+2017-08-31  Claudiu Zissulescu  <claziss@synopsys.com>
+
 	* config/arc/arc-protos.h (compact_sda_memory_operand): Update
 	prototype.
 	* config/arc/arc.c (arc_print_operand): Output scalled address for

gcc/config.gcc

@@ -318,7 +318,7 @@ arc*-*-*)
 	cpu_type=arc
 	c_target_objs="arc-c.o"
 	cxx_target_objs="arc-c.o"
-	extra_options="${extra_options} arc/arc-tables.opt"
+	extra_options="${extra_options} arc/arc-tables.opt g.opt"
 	extra_headers="arc-simd.h"
 	;;
 arm*-*-*)

gcc/config/arc/arc.h

@@ -65,9 +65,9 @@ along with GCC; see the file COPYING3.  If not see
 %(subtarget_cpp_spec)"
 
 #undef CC1_SPEC
-#define CC1_SPEC "\
-%{EB:%{EL:%emay not use both -EB and -EL}} \
-%{EB:-mbig-endian} %{EL:-mlittle-endian} \
+#define CC1_SPEC "%{EB:%{EL:%emay not use both -EB and -EL}}	\
+%{EB:-mbig-endian} %{EL:-mlittle-endian}			\
+%{G*}								\
 "
 extern const char *arc_cpu_to_as (int argc, const char **argv);
 

gcc/config/arc/simdext.md

@@ -1383,19 +1383,18 @@
  [(set (match_operand:V2HI 0 "general_operand" "")
        (match_operand:V2HI 1 "general_operand" ""))]
  ""
-{
- if (!register_operand (operands[0], V2HImode)
-      && !register_operand (operands[1], V2HImode))
-    operands[1] = force_reg (V2HImode, operands[1]);
-})
+ "{
+   if (prepare_move_operands (operands, V2HImode))
+     DONE;
+  }")
 
 (define_expand "mov<mode>"
   [(set (match_operand:VWH 0 "move_dest_operand" "")
 	(match_operand:VWH 1 "general_operand" ""))]
   ""
   "{
-    if (GET_CODE (operands[0]) == MEM)
-     operands[1] = force_reg (<MODE>mode, operands[1]);
+    if (prepare_move_operands (operands, <MODE>mode))
+     DONE;
    }")
 
 (define_insn_and_split "*mov<mode>_insn"
@@ -1440,11 +1439,10 @@
  [(set (match_operand:VWH 0 "general_operand" "")
        (match_operand:VWH 1 "general_operand" ""))]
  ""
-{
- if (!register_operand (operands[0], <MODE>mode)
-      && !register_operand (operands[1], <MODE>mode))
-    operands[1] = force_reg (<MODE>mode, operands[1]);
-})
+ "{
+   if (prepare_move_operands (operands, <MODE>mode))
+     DONE;
+  }")
 
 (define_insn "bswapv2hi2"
   [(set (match_operand:V2HI 0 "register_operand" "=r,r")

gcc/doc/invoke.texi

@@ -614,7 +614,7 @@ Objective-C and Objective-C++ Dialects}.
 -mcrc  -mdsp-packa  -mdvbf  -mlock  -mmac-d16  -mmac-24  -mrtsc  -mswape @gol
 -mtelephony  -mxy  -misize  -mannotate-align  -marclinux  -marclinux_prof @gol
 -mlong-calls  -mmedium-calls  -msdata -mirq-ctrl-saved @gol
--mrgf-banked-regs @gol
+-mrgf-banked-regs -G @var{num} @gol
 -mvolatile-cache  -mtp-regno=@var{regno} @gol
 -malign-call  -mauto-modify-reg  -mbbit-peephole  -mno-brcc @gol
 -mcase-vector-pcrel  -mcompact-casesi  -mno-cond-exec  -mearly-cbranchsi @gol
@@ -14896,6 +14896,13 @@ allow use of the 25-bit range, rather than the 21-bit range with
 conditional branch-and-link.  This is the default for tool chains built
 for @w{@code{arc-linux-uclibc}} and @w{@code{arceb-linux-uclibc}} targets.
 
+@item -G @var{num}
+@opindex G
+Put definitions of externally-visible data in a small data section if
+that data is no bigger than @var{num} bytes.  The default value of
+@var{num} is 4 for any ARC configuration, or 8 when we have double
+load/store operations.
+
 @item -mno-sdata
 @opindex mno-sdata
 Do not generate sdata references.  This is the default for tool chains

gcc/testsuite/ChangeLog

 2017-08-31  Claudiu Zissulescu  <claziss@synopsys.com>
 
+	* gcc.target/arc/sdata-5.c: New test.
+        * gcc.target/arc/arc700-stld-hazard.c: Update test options.
+
+2017-08-31  Claudiu Zissulescu  <claziss@synopsys.com>
+
 	* gcc.target/arc/sdata-3.c: New file.
 	* gcc.target/arc/sdata-4.c: Likewise.
 

gcc/testsuite/gcc.target/arc/arc700-stld-hazard.c

 /* { dg-do compile } */
-/* { dg-options "-mcpu=arc700" } */
+/* { dg-options "-mcpu=arc700 -mno-sdata" } */
 
 volatile int a;
 volatile int b;

gcc/testsuite/gcc.target/arc/sdata-5.c

+/* { dg-do compile } */
+/* { dg-options "-Os -msdata" } */
+
+/* Check interaction between section anchors and small data. */
+
+const int a[1] = {};
+static short b[] = {};
+
+int c;
+
+const int* fn1 (void)
+{
+  return a + b[c];
+}
+/* { dg-final { scan-assembler "@c@sda" } } */