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expr.c (clear_storage): Validate CONST0_RTX extant.

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* expr.c (clear_storage): Validate CONST0_RTX extant.  Special case
        complex modes.

From-SVN: r92615
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Richard Henderson 2004-12-25 19:59:28 -08:00 committed by Richard Henderson
parent 798e3fe5a0
commit 57aaef66e5
2 changed files with 41 additions and 17 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-12-25 Richard Henderson <rth@redhat.com>
* expr.c (clear_storage): Validate CONST0_RTX extant. Special case
complex modes.
2004-12-25 Zdenek Dvorak <dvorakz@suse.cz>
PR rtl-optimization/19078

53
gcc/expr.c
View File

@ -159,6 +159,7 @@ static void emit_single_push_insn (enum machine_mode, rtx, tree);
#endif
static void do_tablejump (rtx, enum machine_mode, rtx, rtx, rtx);
static rtx const_vector_from_tree (tree);
static void write_complex_part (rtx, rtx, bool);
/* Record for each mode whether we can move a register directly to or
from an object of that mode in memory. If we can't, we won't try
@ -2405,30 +2406,48 @@ store_by_pieces_2 (rtx (*genfun) (rtx, ...), enum machine_mode mode,
rtx
clear_storage (rtx object, rtx size)
{
rtx retval = 0;
unsigned int align = (MEM_P (object) ? MEM_ALIGN (object)
: GET_MODE_ALIGNMENT (GET_MODE (object)));
enum machine_mode mode = GET_MODE (object);
unsigned int align;
/* If OBJECT is not BLKmode and SIZE is the same size as its mode,
just move a zero. Otherwise, do this a piece at a time. */
if (GET_MODE (object) != BLKmode
if (mode != BLKmode
&& GET_CODE (size) == CONST_INT
&& INTVAL (size) == (HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (object)))
emit_move_insn (object, CONST0_RTX (GET_MODE (object)));
else
&& INTVAL (size) == (HOST_WIDE_INT) GET_MODE_SIZE (mode))
{
if (size == const0_rtx)
;
else if (GET_CODE (size) == CONST_INT
&& CLEAR_BY_PIECES_P (INTVAL (size), align))
clear_by_pieces (object, INTVAL (size), align);
else if (clear_storage_via_clrmem (object, size, align))
;
else
retval = clear_storage_via_libcall (object, size);
rtx zero = CONST0_RTX (mode);
if (zero != NULL)
{
emit_move_insn (object, zero);
return NULL;
}
if (COMPLEX_MODE_P (mode))
{
zero = CONST0_RTX (GET_MODE_INNER (mode));
if (zero != NULL)
{
write_complex_part (object, zero, 0);
write_complex_part (object, zero, 1);
return NULL;
}
}
}
return retval;
if (size == const0_rtx)
return NULL;
align = MEM_ALIGN (object);
if (GET_CODE (size) == CONST_INT
&& CLEAR_BY_PIECES_P (INTVAL (size), align))
clear_by_pieces (object, INTVAL (size), align);
else if (clear_storage_via_clrmem (object, size, align))
;
else
return clear_storage_via_libcall (object, size);
return NULL;
}
/* A subroutine of clear_storage. Expand a clrmem pattern;