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calls.c (precompute_arguments): New function, extracted from expand_call. 

* calls.c (precompute_arguments): New function, extracted from
        expand_call.
        (expand_call): Use precompute_arguments.

From-SVN: r25409
This commit is contained in:
Jeffrey A Law 1999-02-24 16:29:36 +00:00 committed by Jeff Law
parent 1de558ee81
commit cc0b1adcce
2 changed files with 82 additions and 45 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
Wed Feb 24 14:03:54 1999 Jeffrey A Law (law@cygnus.com)
* calls.c (precompute_arguments): New function, extracted from
expand_call.
(expand_call): Use precompute_arguments.
* calls.c (finalize_must_preallocate): New function, extracted from
expand_call.
(expand_call): Use finalize_must_preallocate.

123
gcc/calls.c
View File

@ -140,6 +140,9 @@ static void store_unaligned_arguments_into_pseudos PROTO ((struct arg_data *,
static int finalize_must_preallocate PROTO ((int, int,
struct arg_data *,
struct args_size *));
static void precompute_arguments PROTO ((int, int, int,
struct arg_data *,
struct args_size *));
#if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
@ -826,6 +829,78 @@ store_unaligned_arguments_into_pseudos (args, num_actuals)
}
}
/* Precompute parameters has needed for a function call.
IS_CONST indicates the target function is a pure function.
MUST_PREALLOCATE indicates that we must preallocate stack space for
any stack arguments.
NUM_ACTUALS is the number of arguments.
ARGS is an array containing information for each argument; this routine
fills in the INITIAL_VALUE and VALUE fields for each precomputed argument.
ARGS_SIZE contains information about the size of the arg list. */
static void
precompute_arguments (is_const, must_preallocate, num_actuals, args, args_size)
int is_const;
int must_preallocate;
int num_actuals;
struct arg_data *args;
struct args_size *args_size;
{
int i;
/* If this function call is cse'able, precompute all the parameters.
Note that if the parameter is constructed into a temporary, this will
cause an additional copy because the parameter will be constructed
into a temporary location and then copied into the outgoing arguments.
If a parameter contains a call to alloca and this function uses the
stack, precompute the parameter. */
/* If we preallocated the stack space, and some arguments must be passed
on the stack, then we must precompute any parameter which contains a
function call which will store arguments on the stack.
Otherwise, evaluating the parameter may clobber previous parameters
which have already been stored into the stack. */
for (i = 0; i < num_actuals; i++)
if (is_const
|| ((args_size->var != 0 || args_size->constant != 0)
&& calls_function (args[i].tree_value, 1))
|| (must_preallocate
&& (args_size->var != 0 || args_size->constant != 0)
&& calls_function (args[i].tree_value, 0)))
{
/* If this is an addressable type, we cannot pre-evaluate it. */
if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))
abort ();
push_temp_slots ();
args[i].initial_value = args[i].value
= expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0);
preserve_temp_slots (args[i].value);
pop_temp_slots ();
/* ANSI doesn't require a sequence point here,
but PCC has one, so this will avoid some problems. */
emit_queue ();
args[i].initial_value = args[i].value
= protect_from_queue (args[i].initial_value, 0);
if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode)
args[i].value
= convert_modes (args[i].mode,
TYPE_MODE (TREE_TYPE (args[i].tree_value)),
args[i].value, args[i].unsignedp);
}
}
/* Given the current state of MUST_PREALLOCATE and information about
arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE,
compute and return the final value for MUST_PREALLOCATE. */
@ -1649,51 +1724,9 @@ expand_call (exp, target, ignore)
))
structure_value_addr = copy_to_reg (structure_value_addr);
/* If this function call is cse'able, precompute all the parameters.
Note that if the parameter is constructed into a temporary, this will
cause an additional copy because the parameter will be constructed
into a temporary location and then copied into the outgoing arguments.
If a parameter contains a call to alloca and this function uses the
stack, precompute the parameter. */
/* If we preallocated the stack space, and some arguments must be passed
on the stack, then we must precompute any parameter which contains a
function call which will store arguments on the stack.
Otherwise, evaluating the parameter may clobber previous parameters
which have already been stored into the stack. */
for (i = 0; i < num_actuals; i++)
if (is_const
|| ((args_size.var != 0 || args_size.constant != 0)
&& calls_function (args[i].tree_value, 1))
|| (must_preallocate && (args_size.var != 0 || args_size.constant != 0)
&& calls_function (args[i].tree_value, 0)))
{
/* If this is an addressable type, we cannot pre-evaluate it. */
if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))
abort ();
push_temp_slots ();
args[i].initial_value = args[i].value
= expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0);
preserve_temp_slots (args[i].value);
pop_temp_slots ();
/* ANSI doesn't require a sequence point here,
but PCC has one, so this will avoid some problems. */
emit_queue ();
args[i].initial_value = args[i].value
= protect_from_queue (args[i].initial_value, 0);
if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode)
args[i].value
= convert_modes (args[i].mode,
TYPE_MODE (TREE_TYPE (args[i].tree_value)),
args[i].value, args[i].unsignedp);
}
/* Precompute any arguments as needed. */
precompute_arguments (is_const, must_preallocate, num_actuals,
args, &args_size);
/* Now we are about to start emitting insns that can be deleted
if a libcall is deleted. */