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(expand_return): When returning BLKmode structure in

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registers, copy it to a psuedo-reg instead of to hard registers.

From-SVN: r9452
This commit is contained in:
Jim Wilson 1995-04-25 15:25:28 -07:00
parent 91887f0bf6
commit 3ffeb8f1c7
1 changed files with 18 additions and 16 deletions

34
gcc/stmt.c

@ -2680,7 +2680,8 @@ expand_return (retval)
copying a BLKmode value into registers. We could put this code in a
more general area (for use by everyone instead of just function
call/return), but until this feature is generally usable it is kept here
(and in expand_call). */
(and in expand_call). The value must go into a pseudo in case there
are cleanups that will clobber the real return register. */
if (retval_rhs != 0
&& TYPE_MODE (TREE_TYPE (retval_rhs)) == BLKmode
@ -2691,7 +2692,7 @@ expand_return (retval)
int bytes = int_size_in_bytes (TREE_TYPE (retval_rhs));
int n_regs = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
rtx *result_pseudos = (rtx *) alloca (sizeof (rtx) * n_regs);
rtx result_reg = DECL_RTL (DECL_RESULT (current_function_decl));
rtx result_reg;
rtx result_val = expand_expr (retval_rhs, NULL_RTX, VOIDmode, 0);
enum machine_mode tmpmode;
@ -2733,13 +2734,6 @@ expand_return (retval)
}
}
/* Now that the value is in pseudos, copy it to the result reg(s). */
emit_queue ();
free_temp_slots ();
for (i = 0; i < n_regs; i++)
emit_move_insn (gen_rtx (REG, word_mode, REGNO (result_reg) + i),
result_pseudos[i]);
/* Find the smallest integer mode large enough to hold the
entire structure and use that mode instead of BLKmode
on the USE insn for the return register. */
@ -2747,17 +2741,25 @@ expand_return (retval)
for (tmpmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmpmode != MAX_MACHINE_MODE;
tmpmode = GET_MODE_WIDER_MODE (tmpmode))
{
/* Have we found a large enough mode? */
if (GET_MODE_SIZE (tmpmode) >= bytes)
break;
}
{
/* Have we found a large enough mode? */
if (GET_MODE_SIZE (tmpmode) >= bytes)
break;
}
/* No suitable mode found. */
if (tmpmode == MAX_MACHINE_MODE)
abort ();
abort ();
PUT_MODE (result_reg, tmpmode);
result_reg = gen_reg_rtx (tmpmode);
PUT_MODE (DECL_RTL (DECL_RESULT (current_function_decl)), tmpmode);
/* Now that the value is in pseudos, copy it to the result reg(s). */
emit_queue ();
free_temp_slots ();
for (i = 0; i < n_regs; i++)
emit_move_insn (gen_rtx (REG, word_mode, REGNO (result_reg) + i),
result_pseudos[i]);
expand_value_return (result_reg);
}