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(prepare_call_address): New arg REG_PARM_SEEN. 

All callers changed.
(expand_call): Pre-load args if small reg classes and reg parms.

From-SVN: r7073
This commit is contained in:
Richard Kenner 1994-04-18 16:37:01 -04:00
parent 5f61007448
commit 0136807851
1 changed files with 22 additions and 6 deletions
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28
gcc/calls.c
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@ -242,10 +242,11 @@ calls_function_1 (exp, which)
register should be added, if required. */
rtx
prepare_call_address (funexp, fndecl, use_insns)
prepare_call_address (funexp, fndecl, use_insns, reg_parm_seen)
rtx funexp;
tree fndecl;
rtx *use_insns;
int reg_parm_seen;
{
rtx static_chain_value = 0;
@ -258,7 +259,14 @@ prepare_call_address (funexp, fndecl, use_insns)
/* Make a valid memory address and copy constants thru pseudo-regs,
but not for a constant address if -fno-function-cse. */
if (GET_CODE (funexp) != SYMBOL_REF)
funexp = memory_address (FUNCTION_MODE, funexp);
funexp =
#ifdef SMALL_REGISTER_CLASSES
/* If we are using registers for parameters, force the
function address into a register now. */
reg_parm_seen ? force_not_mem (memory_address (FUNCTION_MODE, funexp))
:
#endif
memory_address (FUNCTION_MODE, funexp);
else
{
#ifndef NO_FUNCTION_CSE
@ -1577,14 +1585,22 @@ expand_call (exp, target, ignore)
/* If the value is expensive, and we are inside an appropriately
short loop, put the value into a pseudo and then put the pseudo
into the hard reg. */
into the hard reg.
For small register classes, also do this if this call uses
register parameters. This is to avoid reload conflicts while
loading the parameters registers. */
if ((! (GET_CODE (args[i].value) == REG
|| (GET_CODE (args[i].value) == SUBREG
&& GET_CODE (SUBREG_REG (args[i].value)) == REG)))
&& args[i].mode != BLKmode
&& rtx_cost (args[i].value, SET) > 2
#ifdef SMALL_REGISTER_CLASSES
&& (reg_parm_seen || preserve_subexpressions_p ()))
#else
&& preserve_subexpressions_p ())
#endif
args[i].value = copy_to_mode_reg (args[i].mode, args[i].value);
}
@ -1766,7 +1782,7 @@ expand_call (exp, target, ignore)
}
}
funexp = prepare_call_address (funexp, fndecl, &use_insns);
funexp = prepare_call_address (funexp, fndecl, &use_insns, reg_parm_seen);
/* Now do the register loads required for any wholly-register parms or any
parms which are passed both on the stack and in a register. Their
@ -2310,7 +2326,7 @@ emit_library_call VPROTO((rtx orgfun, int no_queue, enum machine_mode outmode,
argnum = 0;
#endif
fun = prepare_call_address (fun, NULL_TREE, &use_insns);
fun = prepare_call_address (fun, NULL_TREE, &use_insns, 0);
/* Now load any reg parms into their regs. */
@ -2661,7 +2677,7 @@ emit_library_call_value VPROTO((rtx orgfun, rtx value, int no_queue,
argnum = 0;
#endif
fun = prepare_call_address (fun, NULL_TREE, &use_insns);
fun = prepare_call_address (fun, NULL_TREE, &use_insns, 0);
/* Now load any reg parms into their regs. */