[gomp3.1] C++ OpenMP 3.1 atomics support
Jakub Jelinek
jakub@redhat.com
Wed Apr 27 09:15:00 GMT 2011
Hi!
This patch adds support for OpenMP 3.1 atomics to C++ FE.
Tested on x86_64-linux, committed to gomp-3_1-branch.
2011-04-27 Jakub Jelinek <jakub@redhat.com>
* parser.c (cp_parser_omp_atomic): Handle parsing OpenMP 3.1 atomics.
Adjust finish_omp_atomic caller.
* cp-tree.h (finish_omp_atomic): Adjust prototype.
* semantics.c (finish_omp_atomic): Add OPCODE, V and LHS1 arguments.
Handle OpenMP 3.1 atomics.
* pt.c (tsubst_expr) <case OMP_ATOMIC>: Handle OpenMP 3.1 atomics.
* testsuite/libgomp.c++/atomic-2.C: New test.
* testsuite/libgomp.c++/atomic-3.C: New test.
* testsuite/libgomp.c++/atomic-4.C: New test.
* testsuite/libgomp.c++/atomic-5.C: New test.
--- gcc/cp/parser.c.jj 2011-03-03 20:00:38.000000000 +0100
+++ gcc/cp/parser.c 2011-04-26 18:55:38.000000000 +0200
@@ -24041,34 +24041,132 @@ cp_parser_omp_structured_block (cp_parse
binop:
+, *, -, /, &, ^, |, <<, >>
- where x is an lvalue expression with scalar type. */
+ where x is an lvalue expression with scalar type.
+
+ OpenMP 3.1:
+ # pragma omp atomic read new-line
+ read-stmt
+
+ # pragma omp atomic write new-line
+ write-stmt
+
+ # pragma omp atomic update new-line
+ expression-stmt
+
+ # pragma omp atomic capture new-line
+ capture-stmt
+
+ # pragma omp atomic capture new-line
+ capture-block
+
+ read-stmt:
+ v = x
+ write-stmt:
+ x = expr
+ capture-stmt:
+ v = x binop= expr | v = x++ | v = ++x | v = x-- | v = --x
+ capture-block:
+ { v = x; x binop= expr; } | { x binop= expr; v = x; }
+
+ where x and v are lvalue expressions with scalar type. */
static void
cp_parser_omp_atomic (cp_parser *parser, cp_token *pragma_tok)
{
- tree lhs, rhs;
- enum tree_code code;
+ tree lhs = NULL_TREE, rhs = NULL_TREE, v = NULL_TREE, lhs1 = NULL_TREE;
+ tree orig_lhs;
+ enum tree_code code = OMP_ATOMIC, opcode = NOP_EXPR;
+ bool structured_block = false;
+
+ if (cp_lexer_next_token_is (parser->lexer, CPP_NAME))
+ {
+ tree id = cp_lexer_peek_token (parser->lexer)->u.value;
+ const char *p = IDENTIFIER_POINTER (id);
+ if (!strcmp (p, "read"))
+ code = OMP_ATOMIC_READ;
+ else if (!strcmp (p, "write"))
+ code = NOP_EXPR;
+ else if (!strcmp (p, "update"))
+ code = OMP_ATOMIC;
+ else if (!strcmp (p, "capture"))
+ code = OMP_ATOMIC_CAPTURE_NEW;
+ else
+ p = NULL;
+ if (p)
+ cp_lexer_consume_token (parser->lexer);
+ }
cp_parser_require_pragma_eol (parser, pragma_tok);
+ switch (code)
+ {
+ case OMP_ATOMIC_READ:
+ case NOP_EXPR: /* atomic write */
+ v = cp_parser_unary_expression (parser, /*address_p=*/false,
+ /*cast_p=*/false, NULL);
+ if (v == error_mark_node)
+ goto saw_error;
+ if (!cp_parser_require (parser, CPP_EQ, RT_EQ))
+ goto saw_error;
+ lhs = cp_parser_unary_expression (parser, /*address_p=*/false,
+ /*cast_p=*/false, NULL);
+ if (lhs == error_mark_node)
+ goto saw_error;
+ if (code == NOP_EXPR)
+ {
+ /* atomic write is represented by OMP_ATOMIC with NOP_EXPR
+ opcode. */
+ code = OMP_ATOMIC;
+ rhs = lhs;
+ lhs = v;
+ v = NULL_TREE;
+ }
+ goto done;
+ case OMP_ATOMIC_CAPTURE_NEW:
+ if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE))
+ {
+ cp_lexer_consume_token (parser->lexer);
+ structured_block = true;
+ }
+ else
+ {
+ v = cp_parser_unary_expression (parser, /*address_p=*/false,
+ /*cast_p=*/false, NULL);
+ if (v == error_mark_node)
+ goto saw_error;
+ if (!cp_parser_require (parser, CPP_EQ, RT_EQ))
+ goto saw_error;
+ }
+ default:
+ break;
+ }
+
+restart:
lhs = cp_parser_unary_expression (parser, /*address_p=*/false,
/*cast_p=*/false, NULL);
+ orig_lhs = lhs;
switch (TREE_CODE (lhs))
{
case ERROR_MARK:
goto saw_error;
- case PREINCREMENT_EXPR:
case POSTINCREMENT_EXPR:
+ if (code == OMP_ATOMIC_CAPTURE_NEW)
+ code = OMP_ATOMIC_CAPTURE_OLD;
+ /* FALLTHROUGH */
+ case PREINCREMENT_EXPR:
lhs = TREE_OPERAND (lhs, 0);
- code = PLUS_EXPR;
+ opcode = PLUS_EXPR;
rhs = integer_one_node;
break;
- case PREDECREMENT_EXPR:
case POSTDECREMENT_EXPR:
+ if (code == OMP_ATOMIC_CAPTURE_NEW)
+ code = OMP_ATOMIC_CAPTURE_OLD;
+ /* FALLTHROUGH */
+ case PREDECREMENT_EXPR:
lhs = TREE_OPERAND (lhs, 0);
- code = MINUS_EXPR;
+ opcode = MINUS_EXPR;
rhs = integer_one_node;
break;
@@ -24086,48 +24184,67 @@ cp_parser_omp_atomic (cp_parser *parser,
case MODIFY_EXPR:
if (TREE_CODE (lhs) == MODIFY_EXPR
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (lhs, 0))) == BOOLEAN_TYPE)
- {
- /* Undo effects of boolean_increment. */
- if (integer_onep (TREE_OPERAND (lhs, 1)))
- {
- /* This is pre or post increment. */
- rhs = TREE_OPERAND (lhs, 1);
- lhs = TREE_OPERAND (lhs, 0);
- code = NOP_EXPR;
- break;
- }
- }
+ {
+ /* Undo effects of boolean_increment. */
+ if (integer_onep (TREE_OPERAND (lhs, 1)))
+ {
+ /* This is pre or post increment. */
+ rhs = TREE_OPERAND (lhs, 1);
+ lhs = TREE_OPERAND (lhs, 0);
+ opcode = NOP_EXPR;
+ if (code == OMP_ATOMIC_CAPTURE_NEW
+ && TREE_CODE (orig_lhs) == COMPOUND_EXPR)
+ code = OMP_ATOMIC_CAPTURE_OLD;
+ break;
+ }
+ }
/* FALLTHRU */
default:
switch (cp_lexer_peek_token (parser->lexer)->type)
{
case CPP_MULT_EQ:
- code = MULT_EXPR;
+ opcode = MULT_EXPR;
break;
case CPP_DIV_EQ:
- code = TRUNC_DIV_EXPR;
+ opcode = TRUNC_DIV_EXPR;
break;
case CPP_PLUS_EQ:
- code = PLUS_EXPR;
+ opcode = PLUS_EXPR;
break;
case CPP_MINUS_EQ:
- code = MINUS_EXPR;
+ opcode = MINUS_EXPR;
break;
case CPP_LSHIFT_EQ:
- code = LSHIFT_EXPR;
+ opcode = LSHIFT_EXPR;
break;
case CPP_RSHIFT_EQ:
- code = RSHIFT_EXPR;
+ opcode = RSHIFT_EXPR;
break;
case CPP_AND_EQ:
- code = BIT_AND_EXPR;
+ opcode = BIT_AND_EXPR;
break;
case CPP_OR_EQ:
- code = BIT_IOR_EXPR;
+ opcode = BIT_IOR_EXPR;
break;
case CPP_XOR_EQ:
- code = BIT_XOR_EXPR;
+ opcode = BIT_XOR_EXPR;
break;
+ case CPP_EQ:
+ if (structured_block && code == OMP_ATOMIC_CAPTURE_NEW)
+ {
+ code = OMP_ATOMIC_CAPTURE_OLD;
+ v = lhs;
+ lhs = NULL_TREE;
+ cp_lexer_consume_token (parser->lexer);
+ lhs1 = cp_parser_unary_expression (parser, /*address_p=*/false,
+ /*cast_p=*/false, NULL);
+ if (lhs1 == error_mark_node)
+ goto saw_error;
+ if (!cp_parser_require (parser, CPP_SEMICOLON, RT_SEMICOLON))
+ goto saw_error;
+ goto restart;
+ }
+ /* FALLTHROUGH */
default:
cp_parser_error (parser,
"invalid operator for %<#pragma omp atomic%>");
@@ -24140,8 +24257,30 @@ cp_parser_omp_atomic (cp_parser *parser,
goto saw_error;
break;
}
- finish_omp_atomic (code, lhs, rhs);
- cp_parser_consume_semicolon_at_end_of_statement (parser);
+ if (structured_block && code == OMP_ATOMIC_CAPTURE_NEW)
+ {
+ if (!cp_parser_require (parser, CPP_SEMICOLON, RT_SEMICOLON))
+ goto saw_error;
+ v = cp_parser_unary_expression (parser, /*address_p=*/false,
+ /*cast_p=*/false, NULL);
+ if (v == error_mark_node)
+ goto saw_error;
+ if (!cp_parser_require (parser, CPP_EQ, RT_EQ))
+ goto saw_error;
+ lhs1 = cp_parser_unary_expression (parser, /*address_p=*/false,
+ /*cast_p=*/false, NULL);
+ if (lhs1 == error_mark_node)
+ goto saw_error;
+ }
+ if (structured_block)
+ {
+ cp_parser_consume_semicolon_at_end_of_statement (parser);
+ cp_parser_require (parser, CPP_CLOSE_BRACE, RT_CLOSE_BRACE);
+ }
+done:
+ finish_omp_atomic (code, opcode, lhs, rhs, v, lhs1);
+ if (!structured_block)
+ cp_parser_consume_semicolon_at_end_of_statement (parser);
return;
saw_error:
--- gcc/cp/cp-tree.h.jj 2011-02-24 14:18:07.000000000 +0100
+++ gcc/cp/cp-tree.h 2011-04-21 16:20:08.000000000 +0200
@@ -5333,7 +5333,8 @@ extern tree begin_omp_task (void);
extern tree finish_omp_task (tree, tree);
extern tree finish_omp_for (location_t, tree, tree,
tree, tree, tree, tree, tree);
-extern void finish_omp_atomic (enum tree_code, tree, tree);
+extern void finish_omp_atomic (enum tree_code, enum tree_code,
+ tree, tree, tree, tree);
extern void finish_omp_barrier (void);
extern void finish_omp_flush (void);
extern void finish_omp_taskwait (void);
--- gcc/cp/semantics.c.jj 2011-04-20 18:31:25.000000000 +0200
+++ gcc/cp/semantics.c 2011-04-27 09:47:52.000000000 +0200
@@ -4581,15 +4581,20 @@ finish_omp_for (location_t locus, tree d
}
void
-finish_omp_atomic (enum tree_code code, tree lhs, tree rhs)
+finish_omp_atomic (enum tree_code code, enum tree_code opcode, tree lhs,
+ tree rhs, tree v, tree lhs1)
{
tree orig_lhs;
tree orig_rhs;
+ tree orig_v;
+ tree orig_lhs1;
bool dependent_p;
tree stmt;
orig_lhs = lhs;
orig_rhs = rhs;
+ orig_v = v;
+ orig_lhs1 = lhs1;
dependent_p = false;
stmt = NULL_TREE;
@@ -4598,23 +4603,48 @@ finish_omp_atomic (enum tree_code code,
if (processing_template_decl)
{
dependent_p = (type_dependent_expression_p (lhs)
- || type_dependent_expression_p (rhs));
+ || (rhs && type_dependent_expression_p (rhs))
+ || (v && type_dependent_expression_p (v))
+ || (lhs1 && type_dependent_expression_p (lhs1)));
if (!dependent_p)
{
lhs = build_non_dependent_expr (lhs);
- rhs = build_non_dependent_expr (rhs);
+ if (rhs)
+ rhs = build_non_dependent_expr (rhs);
+ if (v)
+ v = build_non_dependent_expr (v);
+ if (lhs1)
+ lhs1 = build_non_dependent_expr (lhs1);
}
}
if (!dependent_p)
{
- stmt = c_finish_omp_atomic (input_location, OMP_ATOMIC, code, lhs, rhs,
- NULL_TREE, NULL_TREE);
+ stmt = c_finish_omp_atomic (input_location, code, opcode, lhs, rhs,
+ v, lhs1);
if (stmt == error_mark_node)
return;
}
if (processing_template_decl)
- stmt = build2 (OMP_ATOMIC, void_type_node, integer_zero_node,
- build2 (code, void_type_node, orig_lhs, orig_rhs));
+ {
+ if (code == OMP_ATOMIC_READ)
+ {
+ stmt = build_min_nt (OMP_ATOMIC_READ, orig_lhs);
+ stmt = build2 (MODIFY_EXPR, void_type_node, orig_v, stmt);
+ }
+ else
+ {
+ if (opcode == NOP_EXPR)
+ stmt = build2 (MODIFY_EXPR, void_type_node, orig_lhs, orig_rhs);
+ else
+ stmt = build2 (opcode, void_type_node, orig_lhs, orig_rhs);
+ if (code != OMP_ATOMIC)
+ {
+ stmt = build_min_nt (code, orig_lhs1, stmt);
+ stmt = build2 (MODIFY_EXPR, void_type_node, orig_v, stmt);
+ }
+ }
+ stmt = build2 (OMP_ATOMIC, void_type_node, integer_zero_node, stmt);
+ }
add_stmt (stmt);
}
--- gcc/cp/pt.c.jj 2011-02-24 14:18:07.000000000 +0100
+++ gcc/cp/pt.c 2011-04-27 09:52:25.000000000 +0200
@@ -12397,12 +12397,43 @@ tsubst_expr (tree t, tree args, tsubst_f
case OMP_ATOMIC:
gcc_assert (OMP_ATOMIC_DEPENDENT_P (t));
- {
- tree op1 = TREE_OPERAND (t, 1);
- tree lhs = RECUR (TREE_OPERAND (op1, 0));
- tree rhs = RECUR (TREE_OPERAND (op1, 1));
- finish_omp_atomic (TREE_CODE (op1), lhs, rhs);
- }
+ if (TREE_CODE (TREE_OPERAND (t, 1)) != MODIFY_EXPR)
+ {
+ tree op1 = TREE_OPERAND (t, 1);
+ tree lhs = RECUR (TREE_OPERAND (op1, 0));
+ tree rhs = RECUR (TREE_OPERAND (op1, 1));
+ finish_omp_atomic (OMP_ATOMIC, TREE_CODE (op1), lhs, rhs,
+ NULL_TREE, NULL_TREE);
+ }
+ else
+ {
+ tree op1 = TREE_OPERAND (t, 1);
+ tree v = NULL_TREE, lhs, rhs = NULL_TREE, lhs1 = NULL_TREE;
+ enum tree_code code = TREE_CODE (TREE_OPERAND (op1, 1));
+ enum tree_code opcode = NOP_EXPR;
+ if (code == OMP_ATOMIC_READ)
+ {
+ v = RECUR (TREE_OPERAND (op1, 0));
+ lhs = RECUR (TREE_OPERAND (TREE_OPERAND (op1, 1), 0));
+ }
+ else if (code == OMP_ATOMIC_CAPTURE_OLD
+ || code == OMP_ATOMIC_CAPTURE_NEW)
+ {
+ tree op11 = TREE_OPERAND (TREE_OPERAND (op1, 1), 1);
+ v = RECUR (TREE_OPERAND (op1, 0));
+ lhs1 = RECUR (TREE_OPERAND (TREE_OPERAND (op1, 1), 0));
+ lhs = RECUR (TREE_OPERAND (op11, 0));
+ rhs = RECUR (TREE_OPERAND (op11, 1));
+ opcode = TREE_CODE (op11);
+ }
+ else
+ {
+ code = OMP_ATOMIC;
+ lhs = RECUR (TREE_OPERAND (op1, 0));
+ rhs = RECUR (TREE_OPERAND (op1, 1));
+ }
+ finish_omp_atomic (code, opcode, lhs, rhs, v, lhs1);
+ }
break;
case EXPR_PACK_EXPANSION:
--- libgomp/testsuite/libgomp.c++/atomic-5.C.jj 2011-04-27 09:55:44.000000000 +0200
+++ libgomp/testsuite/libgomp.c++/atomic-5.C 2011-04-27 09:56:50.000000000 +0200
@@ -0,0 +1,47 @@
+// { dg-do run }
+
+extern "C" void abort (void);
+
+template <typename T>
+void
+foo (void)
+{
+ extern T v, x1, x2, x3, x4, x5, x6;
+ #pragma omp atomic capture
+ v = ++x1;
+ if (!v)
+ abort ();
+ #pragma omp atomic capture
+ v = x2++;
+ if (v)
+ abort ();
+ #pragma omp atomic read
+ v = x3;
+ if (!v)
+ abort ();
+ #pragma omp atomic read
+ v = x4;
+ if (!v)
+ abort ();
+ #pragma omp atomic capture
+ { v = x5; x5 |= 1; }
+ if (v)
+ abort ();
+ #pragma omp atomic capture
+ { x6 |= 1; v = x6; }
+ if (!v)
+ abort ();
+}
+
+bool v, x1, x2, x3, x4, x5, x6;
+
+int
+main ()
+{
+ #pragma omp atomic write
+ x3 = true;
+ #pragma omp atomic write
+ x4 = true;
+ foo <bool> ();
+ return 0;
+}
--- libgomp/testsuite/libgomp.c++/atomic-4.C.jj 2011-04-26 19:03:11.000000000 +0200
+++ libgomp/testsuite/libgomp.c++/atomic-4.C 2011-04-26 19:05:45.000000000 +0200
@@ -0,0 +1,122 @@
+// { dg-do run }
+
+extern "C" void abort (void);
+template <typename T, typename T2>
+int
+foo (void)
+{
+ extern T x;
+ extern T2 y;
+ T v;
+ T2 f;
+ #pragma omp atomic read
+ v = x;
+ if (v != 6)
+ abort ();
+ #pragma omp atomic write
+ x = 17;
+ #pragma omp atomic read
+ v = x;
+ if (v != 17)
+ abort ();
+ #pragma omp atomic update
+ x++;
+ #pragma omp atomic read
+ v = x;
+ if (v != 18)
+ abort ();
+ #pragma omp atomic capture
+ v = x++;
+ if (v != 18)
+ abort ();
+ #pragma omp atomic read
+ v = x;
+ if (v != 19)
+ abort ();
+ #pragma omp atomic capture
+ v = ++x;
+ if (v != 20)
+ abort ();
+ #pragma omp atomic read
+ v = x;
+ if (v != 20)
+ abort ();
+ #pragma omp atomic capture
+ { v = x; x *= 3; }
+ if (v != 20)
+ abort ();
+ #pragma omp atomic read
+ v = x;
+ if (v != 60)
+ abort ();
+ #pragma omp atomic capture
+ {
+ x |= 2;
+ v = x;
+ }
+ if (v != 62)
+ abort ();
+ #pragma omp atomic read
+ v = x;
+ if (v != 62)
+ abort ();
+ #pragma omp atomic write
+ y = 17.5f;
+ #pragma omp atomic read
+ f = y;
+ if (f != 17.5)
+ abort ();
+ #pragma omp atomic update
+ y *= 2.0f;
+ #pragma omp atomic read
+ f = y;
+ if (y != 35.0)
+ abort ();
+ #pragma omp atomic capture
+ f = y *= 2.0f;
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic capture
+ f = y++;
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic read
+ f = y;
+ if (f != 71.0)
+ abort ();
+ #pragma omp atomic capture
+ f = --y;
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic read
+ f = y;
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic capture
+ { f = y; y /= 2.0f; }
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic read
+ f = y;
+ if (f != 35.0)
+ abort ();
+ #pragma omp atomic capture
+ { y /= 2.0f; f = y; }
+ if (f != 17.5)
+ abort ();
+ #pragma omp atomic read
+ f = y;
+ if (f != 17.5)
+ abort ();
+ return 0;
+}
+
+int x = 6;
+float y;
+
+int
+main ()
+{
+ foo <int, float> ();
+ return 0;
+}
--- libgomp/testsuite/libgomp.c++/atomic-3.C.jj 2011-04-26 18:51:34.000000000 +0200
+++ libgomp/testsuite/libgomp.c++/atomic-3.C 2011-04-27 09:57:02.000000000 +0200
@@ -0,0 +1,44 @@
+// { dg-do run }
+
+extern "C" void abort (void);
+bool v, x1, x2, x3, x4, x5, x6;
+
+void
+foo (void)
+{
+ #pragma omp atomic capture
+ v = ++x1;
+ if (!v)
+ abort ();
+ #pragma omp atomic capture
+ v = x2++;
+ if (v)
+ abort ();
+ #pragma omp atomic read
+ v = x3;
+ if (!v)
+ abort ();
+ #pragma omp atomic read
+ v = x4;
+ if (!v)
+ abort ();
+ #pragma omp atomic capture
+ { v = x5; x5 |= 1; }
+ if (v)
+ abort ();
+ #pragma omp atomic capture
+ { x6 |= 1; v = x6; }
+ if (!v)
+ abort ();
+}
+
+int
+main ()
+{
+ #pragma omp atomic write
+ x3 = true;
+ #pragma omp atomic write
+ x4 = true;
+ foo ();
+ return 0;
+}
--- libgomp/testsuite/libgomp.c++/atomic-2.C.jj 2011-04-26 18:51:29.000000000 +0200
+++ libgomp/testsuite/libgomp.c++/atomic-2.C 2011-04-26 18:53:21.000000000 +0200
@@ -0,0 +1,112 @@
+// { dg-do run }
+
+extern "C" void abort (void);
+int x = 6;
+float y;
+
+int
+main (void)
+{
+ int v;
+ float f;
+ #pragma omp atomic read
+ v = x;
+ if (v != 6)
+ abort ();
+ #pragma omp atomic write
+ x = 17;
+ #pragma omp atomic read
+ v = x;
+ if (v != 17)
+ abort ();
+ #pragma omp atomic update
+ x++;
+ #pragma omp atomic read
+ v = x;
+ if (v != 18)
+ abort ();
+ #pragma omp atomic capture
+ v = x++;
+ if (v != 18)
+ abort ();
+ #pragma omp atomic read
+ v = x;
+ if (v != 19)
+ abort ();
+ #pragma omp atomic capture
+ v = ++x;
+ if (v != 20)
+ abort ();
+ #pragma omp atomic read
+ v = x;
+ if (v != 20)
+ abort ();
+ #pragma omp atomic capture
+ { v = x; x *= 3; }
+ if (v != 20)
+ abort ();
+ #pragma omp atomic read
+ v = x;
+ if (v != 60)
+ abort ();
+ #pragma omp atomic capture
+ {
+ x |= 2;
+ v = x;
+ }
+ if (v != 62)
+ abort ();
+ #pragma omp atomic read
+ v = x;
+ if (v != 62)
+ abort ();
+ #pragma omp atomic write
+ y = 17.5f;
+ #pragma omp atomic read
+ f = y;
+ if (f != 17.5)
+ abort ();
+ #pragma omp atomic update
+ y *= 2.0f;
+ #pragma omp atomic read
+ f = y;
+ if (y != 35.0)
+ abort ();
+ #pragma omp atomic capture
+ f = y *= 2.0f;
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic capture
+ f = y++;
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic read
+ f = y;
+ if (f != 71.0)
+ abort ();
+ #pragma omp atomic capture
+ f = --y;
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic read
+ f = y;
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic capture
+ { f = y; y /= 2.0f; }
+ if (f != 70.0)
+ abort ();
+ #pragma omp atomic read
+ f = y;
+ if (f != 35.0)
+ abort ();
+ #pragma omp atomic capture
+ { y /= 2.0f; f = y; }
+ if (f != 17.5)
+ abort ();
+ #pragma omp atomic read
+ f = y;
+ if (f != 17.5)
+ abort ();
+ return 0;
+}
Jakub
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