common.md: New file.

gcc/
	* common.md: New file.
	* doc/md.texi: Update description of generic, machine-independent
	constraints.
	* config/s390/constraints.md (e): Delete.
	* Makefile.in (md_file): Include common.md.
	* config/m32c/t-m32c (md_file): Likewise.
	* genpreds.c (general_mem): New array.
	(generic_constraint_letters): Remove constraints now defined by
	common.md.
	(add_constraint): Map TARGET_MEM_CONSTRAINT to general_mem.
	Allow the first character to be '<' or '>' as well.
	* genoutput.c (general_mem): New array.
	(indep_constraints): Remove constraints now defined by common.md.
	(note_constraint): Map TARGET_MEM_CONSTRAINT to general_mem.
	Remove special handling of 'm'.
	* ira-costs.c (record_reg_classes): Remove special handling of
	constraints now defined by common.md.
	* ira.c (ira_setup_alts, ira_get_dup_out_num): Likewise.
	* ira-lives.c (single_reg_class): Likewise.
	(ira_implicitly_set_insn_hard_regs): Likewise.
	* lra-constraints.c (reg_class_from_constraints): Likewise.
	(process_alt_operands, process_address, curr_insn_transform): Likewise.
	* postreload.c (reload_cse_simplify_operands): Likewise.
	* reload.c (push_secondary_reload, scratch_reload_class)
	(find_reloads, alternative_allows_const_pool_ref): Likewise.
	* reload1.c (maybe_fix_stack_asms): Likewise.
	* targhooks.c (default_secondary_reload): Likewise.
	* stmt.c (parse_output_constraint): Likewise.
	* recog.c (preprocess_constraints): Likewise.
	(constrain_operands, peep2_find_free_register): Likewise.
	(asm_operand_ok): Likewise, but add a comment saying why 'o'
	must be handled specially.

From-SVN: r211475

1 files changed, 4 insertions, 15 deletions

diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 27a8f49..e17ffca 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -4355,16 +4355,8 @@ Use this for constraints that should not appear in @code{asm} statements.
 It is occasionally useful to test a constraint from C code rather than
 implicitly via the constraint string in a @code{match_operand}.  The
 generated file @file{tm_p.h} declares a few interfaces for working
-with machine-specific constraints.  None of these interfaces work with
-the generic constraints described in @ref{Simple Constraints}.  This
-may change in the future.
-
-@strong{Warning:} @file{tm_p.h} may declare other functions that
-operate on constraints, besides the ones documented here.  Do not use
-those functions from machine-dependent code.  They exist to implement
-the old constraint interface that machine-independent components of
-the compiler still expect.  They will change or disappear in the
-future.
+with constraints.  At present these are defined for all constraints
+except @code{g} (which is equivalent to @code{general_operand}).
 
 Some valid constraint names are not valid C identifiers, so there is a
 mangling scheme for referring to them from C@.  Constraint names that
@@ -4391,17 +4383,14 @@ the variable @var{m} is a mangled constraint name (usually as part of
 a larger identifier).
 
 @deftp Enum constraint_num
-For each machine-specific constraint, there is a corresponding
+For each constraint except @code{g}, there is a corresponding
 enumeration constant: @samp{CONSTRAINT_} plus the mangled name of the
 constraint.  Functions that take an @code{enum constraint_num} as an
 argument expect one of these constants.
-
-Machine-independent constraints do not have associated constants.
-This may change in the future.
 @end deftp
 
 @deftypefun {inline bool} satisfies_constraint_@var{m} (rtx @var{exp})
-For each machine-specific, non-register constraint @var{m}, there is
+For each non-register constraint @var{m} except @code{g}, there is
 one of these functions; it returns @code{true} if @var{exp} satisfies the
 constraint.  These functions are only visible if @file{rtl.h} was included
 before @file{tm_p.h}.