+2018-12-06 Segher Boessenkool <segher@kernel.crashing.org>
+
+ * doc/extend.texi (Using Assembly Language with C): Document asm inline.
+ (Size of an asm): Fix typo. Document asm inline.
+ * gimple-pretty-print.c (dump_gimple_asm): Handle asm inline.
+ * gimple.h (enum gf_mask): Add GF_ASM_INLINE.
+ (gimple_asm_set_volatile): Fix typo.
+ (gimple_asm_inline_p): New.
+ (gimple_asm_set_inline): New.
+ * gimplify.c (gimplify_asm_expr): Propagate the asm inline flag from
+ tree to gimple.
+ * ipa-icf-gimple.c (func_checker::compare_gimple_asm): Compare the
+ gimple_asm_inline_p flag, too.
+ * tree-core.h (tree_base): Document that protected_flag is ASM_INLINE_P
+ in an ASM_EXPR.
+ * tree-inline.c (estimate_num_insns): If gimple_asm_inline_p return
+ a minimum size for an asm.
+ * tree.h (ASM_INLINE_P): New.
+
2018-12-06 Segher Boessenkool <segher@kernel.crashing.org>
PR inline-asm/55681
+2018-12-06 Segher Boessenkool <segher@kernel.crashing.org>
+
+ * c-parser.c (c_parser_asm_statement): Detect the inline keyword
+ after asm. Pass a flag for it to build_asm_expr.
+ * c-tree.h (build_asm_expr): Update declaration.
+ * c-typeck.c (build_asm_stmt): Add is_inline parameter. Use it to
+ set ASM_INLINE_P.
+
2018-12-06 Segher Boessenkool <segher@kernel.crashing.org>
PR inline-asm/55681
}
/* Parse an asm statement, a GNU extension. This is a full-blown asm
- statement with inputs, outputs, clobbers, and volatile and goto tag
- allowed.
+ statement with inputs, outputs, clobbers, and volatile, inline, and goto
+ tags allowed.
asm-qualifier:
volatile
+ inline
goto
asm-qualifier-list:
c_parser_asm_statement (c_parser *parser)
{
tree quals, str, outputs, inputs, clobbers, labels, ret;
- bool simple, is_volatile, is_goto;
+ bool simple, is_volatile, is_inline, is_goto;
location_t asm_loc = c_parser_peek_token (parser)->location;
int section, nsections;
quals = NULL_TREE;
is_volatile = false;
+ is_inline = false;
is_goto = false;
for (bool done = false; !done; )
switch (c_parser_peek_token (parser)->keyword)
else
done = true;
break;
+ case RID_INLINE:
+ if (!is_inline)
+ {
+ is_inline = true;
+ quals = c_parser_peek_token (parser)->value;
+ c_parser_consume_token (parser);
+ }
+ else
+ done = true;
+ break;
case RID_GOTO:
if (!is_goto)
{
c_parser_skip_to_end_of_block_or_statement (parser);
ret = build_asm_stmt (quals, build_asm_expr (asm_loc, str, outputs, inputs,
- clobbers, labels, simple));
+ clobbers, labels, simple,
+ is_inline));
error:
parser->lex_untranslated_string = false;
extern void check_compound_literal_type (location_t, struct c_type_name *);
extern tree c_start_case (location_t, location_t, tree, bool);
extern void c_finish_case (tree, tree);
-extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
+extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool,
+ bool);
extern tree build_asm_stmt (tree, tree);
extern int c_types_compatible_p (tree, tree);
extern tree c_begin_compound_stmt (bool);
some INPUTS, and some CLOBBERS. The latter three may be NULL.
SIMPLE indicates whether there was anything at all after the
string in the asm expression -- asm("blah") and asm("blah" : )
- are subtly different. We use a ASM_EXPR node to represent this. */
+ are subtly different. We use a ASM_EXPR node to represent this.
+ LOC is the location of the asm, and IS_INLINE says whether this
+ is asm inline. */
tree
build_asm_expr (location_t loc, tree string, tree outputs, tree inputs,
- tree clobbers, tree labels, bool simple)
+ tree clobbers, tree labels, bool simple, bool is_inline)
{
tree tail;
tree args;
as volatile. */
ASM_INPUT_P (args) = simple;
ASM_VOLATILE_P (args) = (noutputs == 0);
+ ASM_INLINE_P (args) = is_inline;
return args;
}
+2018-12-06 Segher Boessenkool <segher@kernel.crashing.org>
+
+ * cp-tree.h (finish_asm_stmt): Update declaration.
+ * parser.c (cp_parser_asm_definition): Detect the inline keyword
+ after asm. Pass a flag for it to finish_asm_stmt.
+ * pt.c (tsubst_expr): Pass the ASM_INLINE_P flag to finish_asm_stmt.
+ * semantics.c (finish_asm_stmt): Add inline_p parameter. Use it to
+ set ASM_INLINE_P.
+
2018-12-06 Segher Boessenkool <segher@kernel.crashing.org>
PR inline-asm/55681
extern void finish_compound_stmt (tree);
extern tree finish_asm_stmt (int, tree, tree, tree, tree,
- tree);
+ tree, bool);
extern tree finish_label_stmt (tree);
extern void finish_label_decl (tree);
extern cp_expr finish_parenthesized_expr (cp_expr);
asm-qualifier:
volatile
+ inline
goto
asm-qualifier-list:
bool extended_p = false;
bool invalid_inputs_p = false;
bool invalid_outputs_p = false;
+ bool inline_p = false;
bool goto_p = false;
required_token missing = RT_NONE;
else
done = true;
break;
+ case RID_INLINE:
+ if (!inline_p && parser->in_function_body)
+ {
+ /* Remember that we saw the `inline' keyword. */
+ inline_p = true;
+ /* Consume the token. */
+ cp_lexer_consume_token (parser->lexer);
+ }
+ else
+ done = true;
+ break;
case RID_GOTO:
if (!goto_p && parser->in_function_body)
{
if (parser->in_function_body)
{
asm_stmt = finish_asm_stmt (volatile_p, string, outputs,
- inputs, clobbers, labels);
+ inputs, clobbers, labels, inline_p);
/* If the extended syntax was not used, mark the ASM_EXPR. */
if (!extended_p)
{
tree labels = tsubst_copy_asm_operands (ASM_LABELS (t), args,
complain, in_decl);
tmp = finish_asm_stmt (ASM_VOLATILE_P (t), string, outputs, inputs,
- clobbers, labels);
+ clobbers, labels, ASM_INLINE_P (t));
tree asm_expr = tmp;
if (TREE_CODE (asm_expr) == CLEANUP_POINT_EXPR)
asm_expr = TREE_OPERAND (asm_expr, 0);
/* Finish an asm-statement, whose components are a STRING, some
OUTPUT_OPERANDS, some INPUT_OPERANDS, some CLOBBERS and some
LABELS. Also note whether the asm-statement should be
- considered volatile. */
+ considered volatile, and whether it is asm inline. */
tree
finish_asm_stmt (int volatile_p, tree string, tree output_operands,
- tree input_operands, tree clobbers, tree labels)
+ tree input_operands, tree clobbers, tree labels, bool inline_p)
{
tree r;
tree t;
output_operands, input_operands,
clobbers, labels);
ASM_VOLATILE_P (r) = volatile_p || noutputs == 0;
+ ASM_INLINE_P (r) = inline_p;
r = maybe_cleanup_point_expr_void (r);
return add_stmt (r);
}
@item volatile
The optional @code{volatile} qualifier has no effect.
All basic @code{asm} blocks are implicitly volatile.
+
+@item inline
+If you use the @code{inline} qualifier, then for inlining purposes the size
+of the asm is taken as the smallest size possible (@pxref{Size of an asm}).
@end table
@subsubheading Parameters
also produce side effects. If so, you may need to use the @code{volatile}
qualifier to disable certain optimizations. @xref{Volatile}.
+@item inline
+If you use the @code{inline} qualifier, then for inlining purposes the size
+of the asm is taken as the smallest size possible (@pxref{Size of an asm}).
+
@item goto
This qualifier informs the compiler that the @code{asm} statement may
perform a jump to one of the labels listed in the @var{GotoLabels}.
@code{asm} and multiplying that by the length of the longest
instruction supported by that processor. (When working out the number
of instructions, it assumes that any occurrence of a newline or of
-whatever statement separator character is supported by the assembler --
+whatever statement separator character is supported by the assembler ---
typically @samp{;} --- indicates the end of an instruction.)
Normally, GCC's estimate is adequate to ensure that correct
If this happens then the assembler may produce a diagnostic saying that
a label is unreachable.
+@cindex @code{asm inline}
+This size is also used for inlining decisions. If you use @code{asm inline}
+instead of just @code{asm}, then for inlining purposes the size of the asm
+is taken as the minimum size, ignoring how many instructions GCC thinks it is.
+
@node Alternate Keywords
@section Alternate Keywords
@cindex alternate keywords
pp_string (buffer, "__asm__");
if (gimple_asm_volatile_p (gs))
pp_string (buffer, " __volatile__");
+ if (gimple_asm_inline_p (gs))
+ pp_string (buffer, " __inline__");
if (gimple_asm_nlabels (gs))
pp_string (buffer, " goto");
pp_string (buffer, "(\"");
enum gf_mask {
GF_ASM_INPUT = 1 << 0,
GF_ASM_VOLATILE = 1 << 1,
+ GF_ASM_INLINE = 1 << 2,
GF_CALL_FROM_THUNK = 1 << 0,
GF_CALL_RETURN_SLOT_OPT = 1 << 1,
GF_CALL_TAILCALL = 1 << 2,
}
-/* Return true ASM_STMT ASM_STMT is an asm statement marked volatile. */
+/* Return true if ASM_STMT is marked volatile. */
static inline bool
gimple_asm_volatile_p (const gasm *asm_stmt)
}
-/* If VOLATLE_P is true, mark asm statement ASM_STMT as volatile. */
+/* If VOLATILE_P is true, mark asm statement ASM_STMT as volatile. */
static inline void
gimple_asm_set_volatile (gasm *asm_stmt, bool volatile_p)
}
+/* Return true if ASM_STMT is marked inline. */
+
+static inline bool
+gimple_asm_inline_p (const gasm *asm_stmt)
+{
+ return (asm_stmt->subcode & GF_ASM_INLINE) != 0;
+}
+
+
+/* If INLINE_P is true, mark asm statement ASM_STMT as inline. */
+
+static inline void
+gimple_asm_set_inline (gasm *asm_stmt, bool inline_p)
+{
+ if (inline_p)
+ asm_stmt->subcode |= GF_ASM_INLINE;
+ else
+ asm_stmt->subcode &= ~GF_ASM_INLINE;
+}
+
+
/* If INPUT_P is true, mark asm ASM_STMT as an ASM_INPUT. */
static inline void
gimple_asm_set_volatile (stmt, ASM_VOLATILE_P (expr) || noutputs == 0);
gimple_asm_set_input (stmt, ASM_INPUT_P (expr));
+ gimple_asm_set_inline (stmt, ASM_INLINE_P (expr));
gimplify_seq_add_stmt (pre_p, stmt);
}
if (gimple_asm_input_p (g1) != gimple_asm_input_p (g2))
return false;
+ if (gimple_asm_inline_p (g1) != gimple_asm_inline_p (g2))
+ return false;
+
if (gimple_asm_ninputs (g1) != gimple_asm_ninputs (g2))
return false;
+2018-12-06 Segher Boessenkool <segher@kernel.crashing.org>
+
+ * c-c++-common/torture/asm-inline.c: New testcase.
+ * gcc.dg/asm-qual-2.c: Test asm inline, too.
+
2018-12-06 Segher Boessenkool <segher@kernel.crashing.org>
PR inline-asm/55681
--- /dev/null
+/* { dg-do compile } */
+/* -O0 does no inlining, and -O3 does it too aggressively for this test: */
+/* { dg-skip-if "" { *-*-* } { "-O0" "-O3" } { "" } }
+/* The normal asm is not inlined: */
+/* { dg-final { scan-assembler-times "w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w.w" 2 } } */
+/* But the asm inline is inlined: */
+/* { dg-final { scan-assembler-times "x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x" 8 } } */
+
+static void f(void)
+{
+ asm ("w\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\n"
+ "w\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw");
+}
+
+int f0(void) { f(); return 0; }
+int f1(void) { f(); return 1; }
+int f2(void) { f(); return 2; }
+int f3(void) { f(); return 3; }
+
+static void fg(void)
+{
+ asm goto("w\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\n"
+ "w\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw\nw" :::: q);
+ q: ;
+}
+
+int fg0(void) { fg(); return 0; }
+int fg1(void) { fg(); return 1; }
+int fg2(void) { fg(); return 2; }
+int fg3(void) { fg(); return 3; }
+
+static void g(void)
+{
+ asm inline("x\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\n"
+ "x\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx");
+}
+
+int g0(void) { g(); return 0; }
+int g1(void) { g(); return 1; }
+int g2(void) { g(); return 2; }
+int g3(void) { g(); return 3; }
+
+static void gg(void)
+{
+ asm inline goto("x\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\n"
+ "x\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx\nx" :::: q);
+ q: ;
+}
+
+int gg0(void) { gg(); return 0; }
+int gg1(void) { gg(); return 1; }
+int gg2(void) { gg(); return 2; }
+int gg3(void) { gg(); return 3; }
f (void)
{
asm volatile goto ("" :::: lab);
+ asm volatile inline ("" :::);
+ asm inline volatile ("" :::);
+ asm inline goto ("" :::: lab);
asm goto volatile ("" :::: lab);
+ asm goto inline ("" :::: lab);
+
+ asm volatile inline goto ("" :::: lab);
+ asm volatile goto inline ("" :::: lab);
+ asm inline volatile goto ("" :::: lab);
+ asm inline goto volatile ("" :::: lab);
+ asm goto volatile inline ("" :::: lab);
+ asm goto inline volatile ("" :::: lab);
/* Duplicates are not allowed. */
asm goto volatile volatile ("" :::: lab); /* { dg-error "" } */
asm goto volatile goto ("" :::: lab); /* { dg-error "" } */
asm volatile goto goto ("" :::: lab); /* { dg-error "" } */
+ asm inline volatile volatile ("" :::); /* { dg-error "" } */
+ asm volatile inline volatile ("" :::); /* { dg-error "" } */
+ asm volatile volatile inline ("" :::); /* { dg-error "" } */
+ asm inline inline volatile ("" :::); /* { dg-error "" } */
+ asm inline volatile inline ("" :::); /* { dg-error "" } */
+ asm volatile inline inline ("" :::); /* { dg-error "" } */
+
+ asm goto inline inline ("" :::: lab); /* { dg-error "" } */
+ asm inline goto inline ("" :::: lab); /* { dg-error "" } */
+ asm inline inline goto ("" :::: lab); /* { dg-error "" } */
+ asm goto goto inline ("" :::: lab); /* { dg-error "" } */
+ asm goto inline goto ("" :::: lab); /* { dg-error "" } */
+ asm inline goto goto ("" :::: lab); /* { dg-error "" } */
+
lab:
;
}
OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
OMP_CLAUSE_LINEAR
+ ASM_INLINE_P in
+ ASM_EXPR
+
side_effects_flag:
TREE_SIDE_EFFECTS in
with very long asm statements. */
if (count > 1000)
count = 1000;
+ /* If this asm is asm inline, count anything as minimum size. */
+ if (gimple_asm_inline_p (as_a <gasm *> (stmt)))
+ count = MIN (1, count);
return MAX (1, count);
}
ASM_OPERAND with no operands. */
#define ASM_INPUT_P(NODE) (ASM_EXPR_CHECK (NODE)->base.static_flag)
#define ASM_VOLATILE_P(NODE) (ASM_EXPR_CHECK (NODE)->base.public_flag)
+/* Nonzero if we want to consider this asm as minimum length and cost
+ for inlining decisions. */
+#define ASM_INLINE_P(NODE) (ASM_EXPR_CHECK (NODE)->base.protected_flag)
/* COND_EXPR accessors. */
#define COND_EXPR_COND(NODE) (TREE_OPERAND (COND_EXPR_CHECK (NODE), 0))
projects / gcc.git / commitdiff