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stmt.c (expand_return): Don't return anything if size is zero.

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* stmt.c (expand_return): Don't return anything if size is zero.
	Delete redundant assignment to BYTES.
	* expr.c (move_block_from_reg): Do nothing if NREGS is zero.

From-SVN: r39156
This commit is contained in:
Richard Kenner 2001-01-20 17:47:45 +00:00 • committed by Richard Kenner
parent 1d26ac96cc
commit 2954d7dbf7
3 changed files with 18 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Sat Jan 20 12:46:57 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* stmt.c (expand_return): Don't return anything if size is zero.
Delete redundant assignment to BYTES.
* expr.c (move_block_from_reg): Do nothing if NREGS is zero.
2001-01-20 Marek Michalkiewicz <marekm@linux.org.pl>
* config/avr/avr.h (INIT_TARGET_OPTABS): Remove most of it, was

3
gcc/expr.c
View file

@ -1857,6 +1857,9 @@ move_block_from_reg (regno, x, nregs, size)
#endif
enum machine_mode mode;
if (nregs == 0)
return;
/* If SIZE is that of a mode no bigger than a word, just use that
mode's store operation. */
if (size <= UNITS_PER_WORD

15
gcc/stmt.c
View file

@ -3016,6 +3016,12 @@ expand_return (retval)
rtx result_val = expand_expr (retval_rhs, NULL_RTX, VOIDmode, 0);
enum machine_mode tmpmode, result_reg_mode;
if (bytes == 0)
{
expand_null_return ();
return;
}
/* Structures whose size is not a multiple of a word are aligned
to the least significant byte (to the right). On a BYTES_BIG_ENDIAN
machine, this means we must skip the empty high order bytes when
@ -3063,15 +3069,12 @@ expand_return (retval)
/* 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. */
bytes = int_size_in_bytes (TREE_TYPE (retval_rhs));
for (tmpmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmpmode != VOIDmode;
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 == VOIDmode)