[ARC] Add support for atomic memory built-in.

gcc/

2015-12-10  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc-protos.h (arc_expand_atomic_op): Prototype.
	(arc_split_compare_and_swap): Likewise.
	(arc_expand_compare_and_swap): Likewise.
	* config/arc/arc.c (arc_init): Check usage atomic option.
	(arc_pre_atomic_barrier): New function.
	(arc_post_atomic_barrier): Likewise.
	(emit_unlikely_jump): Likewise.
	(arc_expand_compare_and_swap_qh): Likewise.
	(arc_expand_compare_and_swap): Likewise.
	(arc_split_compare_and_swap): Likewise.
	(arc_expand_atomic_op): Likewise.
	* config/arc/arc.h (TARGET_CPU_CPP_BUILTINS): New C macro.
	(ASM_SPEC): Enable mlock option when matomic is used.
	* config/arc/arc.md (UNSPEC_ARC_MEMBAR): Define.
	(VUNSPEC_ARC_CAS): Likewise.
	(VUNSPEC_ARC_LL): Likewise.
	(VUNSPEC_ARC_SC): Likewise.
	(VUNSPEC_ARC_EX): Likewise.
	* config/arc/arc.opt (matomic): New option.
	* config/arc/constraints.md (ATO): New constraint.
	* config/arc/predicates.md (mem_noofs_operand): New predicate.
	* doc/invoke.texi: Document -matomic.
	* config/arc/atomic.md: New file.

gcc/testsuite

2015-12-10  Claudiu Zissulescu  <claziss@synopsys.com>

	* lib/target-supports.exp (check_effective_target_arc_atomic): New
	function.
	(check_effective_target_sync_int_long): Add checks for ARC atomic
	feature.
	(check_effective_target_sync_char_short): Likewise.

From-SVN: r231509

gcc/ChangeLog

+2015-12-10  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* config/arc/arc-protos.h (arc_expand_atomic_op): Prototype.
+	(arc_split_compare_and_swap): Likewise.
+	(arc_expand_compare_and_swap): Likewise.
+	* config/arc/arc.c (arc_init): Check usage atomic option.
+	(arc_pre_atomic_barrier): New function.
+	(arc_post_atomic_barrier): Likewise.
+	(emit_unlikely_jump): Likewise.
+	(arc_expand_compare_and_swap_qh): Likewise.
+	(arc_expand_compare_and_swap): Likewise.
+	(arc_split_compare_and_swap): Likewise.
+	(arc_expand_atomic_op): Likewise.
+	* config/arc/arc.h (TARGET_CPU_CPP_BUILTINS): New C macro.
+	(ASM_SPEC): Enable mlock option when matomic is used.
+	* config/arc/arc.md (UNSPEC_ARC_MEMBAR): Define.
+	(VUNSPEC_ARC_CAS): Likewise.
+	(VUNSPEC_ARC_LL): Likewise.
+	(VUNSPEC_ARC_SC): Likewise.
+	(VUNSPEC_ARC_EX): Likewise.
+	* config/arc/arc.opt (matomic): New option.
+	* config/arc/constraints.md (ATO): New constraint.
+	* config/arc/predicates.md (mem_noofs_operand): New predicate.
+	* doc/invoke.texi: Document -matomic.
+	* config/arc/atomic.md: New file.
+
 2015-12-10  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/68817

gcc/config/arc/arc-protos.h

@@ -41,6 +41,10 @@ extern int arc_output_commutative_cond_exec (rtx *operands, bool);
 extern bool arc_expand_movmem (rtx *operands);
 extern bool prepare_move_operands (rtx *operands, machine_mode mode);
 extern void emit_shift (enum rtx_code, rtx, rtx, rtx);
+extern void arc_expand_atomic_op (enum rtx_code, rtx, rtx, rtx, rtx, rtx);
+extern void arc_split_compare_and_swap (rtx *);
+extern void arc_expand_compare_and_swap (rtx *);
+
 #endif /* RTX_CODE */
 
 #ifdef TREE_CODE

gcc/config/arc/arc.h

@@ -88,6 +88,10 @@ along with GCC; see the file COPYING3.  If not see
       {					\
 	builtin_define ("__HS__");	\
       }					\
+    if (TARGET_ATOMIC)			\
+      {					\
+	builtin_define ("__ARC_ATOMIC__");	\
+      }					\
     if (TARGET_NORM)			\
       {					\
 	builtin_define ("__ARC_NORM__");\
@@ -153,7 +157,7 @@ along with GCC; see the file COPYING3.  If not see
 %{mcpu=ARC700|!mcpu=*:%{mrtsc}} \
 %{mcpu=ARCHS:-mHS} \
 %{mcpu=ARCEM:-mEM} \
-"
+%{matomic:-mlock}"
 
 #if DEFAULT_LIBC == LIBC_UCLIBC
 /* Note that the default is to link against dynamic libraries, if they are

gcc/config/arc/arc.md

@@ -128,6 +128,12 @@
    (VUNSPEC_UNIMP_S 28) ; blockage insn for unimp_s generation
    (VUNSPEC_NOP 29) ; volatile NOP
 
+   (UNSPEC_ARC_MEMBAR 30)
+   (VUNSPEC_ARC_CAS 31)
+   (VUNSPEC_ARC_LL 32)
+   (VUNSPEC_ARC_SC 33)
+   (VUNSPEC_ARC_EX 34)
+
    (R0_REG 0)
    (R1_REG 1)
    (R2_REG 2)
@@ -5531,3 +5537,6 @@
 (include "fpx.md")
 
 (include "simdext.md")
+
+;; include atomic extensions
+(include "atomic.md")

gcc/config/arc/arc.opt

@@ -414,3 +414,6 @@ Target Joined
 mmac_
 Target Joined
 
+matomic
+Target Report Mask(ATOMIC)
+Enable atomic instructions.

gcc/config/arc/constraints.md

@@ -421,3 +421,9 @@
    An unsigned 6-bit integer constant, up to 62."
   (and (match_code "const_int")
        (match_test "UNSIGNED_INT6 (ival - 1)")))
+
+;; Memory constraint used for atomic ops.
+(define_memory_constraint "ATO"
+  "A memory with only a base register"
+  (match_operand 0 "mem_noofs_operand"))
+

gcc/config/arc/predicates.md

@@ -813,3 +813,7 @@
 (define_predicate "short_const_int_operand"
   (and (match_operand 0 "const_int_operand")
        (match_test "satisfies_constraint_C16 (op)")))
+
+(define_predicate "mem_noofs_operand"
+  (and (match_code "mem")
+       (match_code "reg" "0")))

gcc/doc/invoke.texi

@@ -538,7 +538,7 @@ Objective-C and Objective-C++ Dialects}.
 @gccoptlist{-mbarrel-shifter @gol
 -mcpu=@var{cpu} -mA6 -mARC600 -mA7 -mARC700 @gol
 -mdpfp -mdpfp-compact -mdpfp-fast -mno-dpfp-lrsr @gol
--mea -mno-mpy -mmul32x16 -mmul64 @gol
+-mea -mno-mpy -mmul32x16 -mmul64 -matomic @gol
 -mnorm -mspfp -mspfp-compact -mspfp-fast -msimd -msoft-float -mswap @gol
 -mcrc -mdsp-packa -mdvbf -mlock -mmac-d16 -mmac-24 -mrtsc -mswape @gol
 -mtelephony -mxy -misize -mannotate-align -marclinux -marclinux_prof @gol
@@ -12970,6 +12970,12 @@ can overridden by FPX options; @samp{mspfp}, @samp{mspfp-compact}, or
 @opindex mswap
 Generate swap instructions.
 
+@item -matomic
+@opindex matomic
+This enables Locked Load/Store Conditional extension to implement
+atomic memopry built-in functions.  Not available for ARC 6xx or ARC
+EM cores.
+
 @item -mdiv-rem
 @opindex mdiv-rem
 Enable DIV/REM instructions for ARCv2 cores.

gcc/testsuite/ChangeLog

+2015-12-10  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* lib/target-supports.exp (check_effective_target_arc_atomic): New
+	function.
+	(check_effective_target_sync_int_long): Add checks for ARC atomic
+	feature.
+	(check_effective_target_sync_char_short): Likewise.
+
 2015-12-10  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/68817

gcc/testsuite/lib/target-supports.exp

@@ -2608,6 +2608,15 @@ proc check_effective_target_aarch64_little_endian { } {
     }]
 }
 
+# Return 1 if this is a compiler supporting ARC atomic operations
+proc check_effective_target_arc_atomic { } {
+    return [check_no_compiler_messages arc_atomic assembly {
+	#if !defined(__ARC_ATOMIC__)
+	#error FOO
+	#endif
+    }]
+}
+
 # Return 1 if this is an arm target using 32-bit instructions
 proc check_effective_target_arm32 { } {
     if { ![istarget arm*-*-*] } {
@@ -5581,6 +5590,7 @@ proc check_effective_target_sync_int_long { } {
 	     || [istarget crisv32-*-*] || [istarget cris-*-*]
 	     || ([istarget sparc*-*-*] && [check_effective_target_sparc_v9])
 	     || [istarget spu-*-*]
+	     || ([istarget arc*-*-*] && [check_effective_target_arc_atomic])
 	     || [check_effective_target_mips_llsc] } {
            set et_sync_int_long_saved 1
         }
@@ -5612,6 +5622,7 @@ proc check_effective_target_sync_char_short { } {
 	     || [istarget crisv32-*-*] || [istarget cris-*-*]
 	     || ([istarget sparc*-*-*] && [check_effective_target_sparc_v9])
 	     || [istarget spu-*-*]
+	     || ([istarget arc*-*-*] && [check_effective_target_arc_atomic])
 	     || [check_effective_target_mips_llsc] } {
            set et_sync_char_short_saved 1
         }