ggc.h (empty_string): Delete.

	* ggc.h (empty_string): Delete.
	* cfgexpand.c (expand_asm_stmt): Use plain "".
	* optabs.c (expand_asm_memory_barrier): Likewise.
	* stringpool.c (empty_string): Delete.
	(digit_vector, digit_string): Delete.
	(ggc_alloc_string): Use plain "", don't optimize single digit
	strings.  Use ggc_alloc_atomic.

From-SVN: r249851

gcc/ChangeLog

+2017-06-30  Nathan Sidwell  <nathan@acm.org>
+
+	* ggc.h (empty_string): Delete.
+	* cfgexpand.c (expand_asm_stmt): Use plain "".
+	* optabs.c (expand_asm_memory_barrier): Likewise.
+	* stringpool.c (empty_string): Delete.
+	(digit_vector, digit_string): Delete.
+	(ggc_alloc_string): Use plain "", don't optimize single digit
+	strings.  Use ggc_alloc_atomic.
+
 2017-06-30  Richard Earnshaw  <rearnsha@arm.com>
 
 	* rtlanal.c (insn_rtx_cost): If a parallel contains exactly one
@@ -26,15 +36,15 @@
 2017-06-30  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/81225
-	* config/i386/sse.md (vec_extract_lo_<mode><mask_name>): For
-	V8FI, V16FI and VI8F_256 iterators, use <store_mask_predicate> instead
-	of nonimmediate_operand and <store_mask_constraint> instead of m for
-	the input operand.  For V8FI iterator, always split if input is a MEM.
-	For V16FI and V8SF_256 iterators, don't test if both operands are MEM
-	if <mask_applied>.  For VI4F_256 iterator, use <store_mask_predicate>
-	instead of register_operand and <store_mask_constraint> instead of v for
-	the input operand.  Make sure both operands aren't MEMs for if not
-	<mask_applied>.
+	* config/i386/sse.md (vec_extract_lo_<mode><mask_name>): For V8FI,
+	V16FI and VI8F_256 iterators, use <store_mask_predicate> instead
+	of nonimmediate_operand and <store_mask_constraint> instead of m
+	for the input operand.  For V8FI iterator, always split if input
+	is a MEM.  For V16FI and V8SF_256 iterators, don't test if both
+	operands are MEM if <mask_applied>.  For VI4F_256 iterator, use
+	<store_mask_predicate> instead of register_operand and
+	<store_mask_constraint> instead of v for the input operand.  Make
+	sure both operands aren't MEMs for if not <mask_applied>.
 
 2017-06-30  Sylvestre Ledru  <sylvestre@debian.org>
 

gcc/cfgexpand.c

@@ -3165,7 +3165,7 @@ expand_asm_stmt (gasm *stmt)
   rtx body = gen_rtx_ASM_OPERANDS ((noutputs == 0 ? VOIDmode
 				    : GET_MODE (output_rvec[0])),
 				   ggc_strdup (gimple_asm_string (stmt)),
-				   empty_string, 0, argvec, constraintvec,
+				   "", 0, argvec, constraintvec,
 				   labelvec, locus);
   MEM_VOLATILE_P (body) = gimple_asm_volatile_p (stmt);
 

gcc/ggc.h

@@ -24,9 +24,6 @@ along with GCC; see the file COPYING3.  If not see
 /* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
    an external gc library that might be linked in.  */
 
-/* Constants for general use.  */
-extern const char empty_string[];	/* empty string */
-
 /* Internal functions and data structures used by the GTY
    machinery, including the generated gt*.[hc] files.  */
 

gcc/optabs.c

@@ -6278,7 +6278,7 @@ expand_asm_memory_barrier (void)
 {
   rtx asm_op, clob;
 
-  asm_op = gen_rtx_ASM_OPERANDS (VOIDmode, empty_string, empty_string, 0,
+  asm_op = gen_rtx_ASM_OPERANDS (VOIDmode, "", "", 0,
 				 rtvec_alloc (0), rtvec_alloc (0),
 				 rtvec_alloc (0), UNKNOWN_LOCATION);
   MEM_VOLATILE_P (asm_op) = 1;

gcc/stringpool.c

@@ -30,18 +30,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "coretypes.h"
 #include "tree.h"
 
-/* The "" allocated string.  */
-const char empty_string[] = "";
-
-/* Character strings, each containing a single decimal digit.
-   Written this way to save space.  */
-static const char digit_vector[] = {
-  '0', 0, '1', 0, '2', 0, '3', 0, '4', 0,
-  '5', 0, '6', 0, '7', 0, '8', 0, '9', 0
-};
-
-#define digit_string(d) (digit_vector + ((d) * 2))
-
 struct ht *ident_hash;
 
 static hashnode alloc_node (cpp_hash_table *);
@@ -82,19 +70,16 @@ alloc_node (cpp_hash_table *table ATTRIBUTE_UNUSED)
 const char *
 ggc_alloc_string (const char *contents, int length MEM_STAT_DECL)
 {
-  char *result;
-
   if (length == -1)
     length = strlen (contents);
 
-  if (length == 0)
-    return empty_string;
-  if (length == 1 && ISDIGIT (contents[0]))
-    return digit_string (contents[0] - '0');
+  if (!length)
+    return "";
 
-  result = (char *) ggc_internal_cleared_alloc (length + 1 PASS_MEM_STAT);
+  char *result = (char *) ggc_alloc_atomic (length + 1);
   memcpy (result, contents, length);
   result[length] = '\0';
+
   return (const char *) result;
 }