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expr.c (emit_block_move): Don't move anything if size is const 0.

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* expr.c (emit_block_move): Don't move anything if size is const 0.
	(clear_storage): Test against const0_rtx instead of comparing INTVAL
	against 0.

From-SVN: r69441
This commit is contained in:
Jakub Jelinek 2003-07-16 13:07:54 +02:00 committed by Jakub Jelinek
parent ac59ed379b
commit 6972c506d4
2 changed files with 10 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2003-07-15 Jakub Jelinek <jakub@redhat.com>
* expr.c (emit_block_move): Don't move anything if size is const 0.
(clear_storage): Test against const0_rtx instead of comparing INTVAL
against 0.
2003-07-15 David S. Miller <davem@redhat.com>
* config/sparc/sparc.c (sparc_nonflat_function_epilogue): Only

5
gcc/expr.c
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@ -1766,6 +1766,9 @@ emit_block_move (rtx x, rtx y, rtx size, enum block_op_methods method)
can be incorrect is coming from __builtin_memcpy. */
if (GET_CODE (size) == CONST_INT)
{
if (INTVAL (size) == 0)
return 0;
x = shallow_copy_rtx (x);
y = shallow_copy_rtx (y);
set_mem_size (x, size);
@ -2975,7 +2978,7 @@ clear_storage (rtx object, rtx size)
object = protect_from_queue (object, 1);
size = protect_from_queue (size, 0);
if (GET_CODE (size) == CONST_INT && INTVAL (size) == 0)
if (size == const0_rtx)
;
else if (GET_CODE (size) == CONST_INT
&& CLEAR_BY_PIECES_P (INTVAL (size), align))