asm inline

The Linux kernel people want a feature that makes GCC pretend some
inline assembler code is tiny (while it would think it is huge), so
that such code will be inlined essentially always instead of
essentially never.

This patch lets you say "asm inline" instead of just "asm", with the
result that that inline assembler is always counted as minimum cost
for inlining.  It implements this for C and C++, making "inline"
another asm-qualifier (supplementing "volatile" and "goto").


	* 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.

gcc/c/
	* 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.

gcc/cp/
	* 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.

gcc/testsuite/
	* c-c++-common/torture/asm-inline.c: New testcase.
	* gcc.dg/asm-qual-2.c: Test asm inline, too.

From-SVN: r266860

1 files changed, 3 insertions, 0 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index 960526d..761b508 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1245,6 +1245,9 @@ extern tree maybe_wrap_with_location (tree, location_t);
    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))