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re PR middle-end/6600 (i960 toolchain hits abort in c_readstr) 

PR middle-end/6600
	* expr.c (STORE_MAX_PIECES): New macro to avoid immediate constants
	larger than INTEGER_CST.  (store_by_pieces_1): Use it here...
	(can_store_by_pieces): ... and here to limit the largest mode used.
	Add a comment to document this function.

From-SVN: r53706
This commit is contained in:
Roger Sayle 2002-05-21 22:38:00 +00:00 committed by Roger Sayle
parent 380e6adea2
commit cf5124f688
2 changed files with 23 additions and 2 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2002-05-21 Roger Sayle <roger@eyesopen.com>
PR middle-end/6600
* expr.c (STORE_MAX_PIECES): New macro to avoid immediate constants
larger than INTEGER_CST. (store_by_pieces_1): Use it here...
(can_store_by_pieces): ... and here to limit the largest mode used.
Add a comment to document this function.
2002-05-21 Richard Henderson <rth@redhat.com>
* flow.c (life_analysis): Fix test for deleted label.

17
gcc/expr.c
View File

@ -1400,6 +1400,13 @@ convert_modes (mode, oldmode, x, unsignedp)
#define MOVE_MAX_PIECES MOVE_MAX
#endif
/* STORE_MAX_PIECES is the number of bytes at a time that we can
store efficiently. Due to internal GCC limitations, this is
MOVE_MAX_PIECES limited by the number of bytes GCC can represent
for an immediate constant. */
#define STORE_MAX_PIECES MIN (MOVE_MAX_PIECES, 2 * sizeof (HOST_WIDE_INT))
/* Generate several move instructions to copy LEN bytes from block FROM to
block TO. (These are MEM rtx's with BLKmode). The caller must pass FROM
and TO through protect_from_queue before calling.
@ -2331,6 +2338,12 @@ use_group_regs (call_fusage, regs)
}
/* Determine whether the LEN bytes generated by CONSTFUN can be
stored to memory using several move instructions. CONSTFUNDATA is
a pointer which will be passed as argument in every CONSTFUN call.
ALIGN is maximum alignment we can assume. Return nonzero if a
call to store_by_pieces should succeed. */
int
can_store_by_pieces (len, constfun, constfundata, align)
unsigned HOST_WIDE_INT len;
@ -2361,7 +2374,7 @@ can_store_by_pieces (len, constfun, constfundata, align)
{
l = len;
mode = VOIDmode;
max_size = MOVE_MAX_PIECES + 1;
max_size = STORE_MAX_PIECES + 1;
while (max_size > 1)
{
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
@ -2472,7 +2485,7 @@ store_by_pieces_1 (data, align)
unsigned int align;
{
rtx to_addr = XEXP (data->to, 0);
unsigned HOST_WIDE_INT max_size = MOVE_MAX_PIECES + 1;
unsigned HOST_WIDE_INT max_size = STORE_MAX_PIECES + 1;
enum machine_mode mode = VOIDmode, tmode;
enum insn_code icode;