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recog.c (offsettable_address_p): If mode size is zero, assume BIGGEST_ALIGNMENT.

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* recog.c (offsettable_address_p): If mode size is zero, assume
        BIGGEST_ALIGNMENT.

From-SVN: r34158
This commit is contained in:
Richard Henderson 2000-05-24 23:17:05 -07:00 committed by Richard Henderson
parent d94611f158
commit 7bdebc3aac
2 changed files with 15 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-05-24 Richard Henderson <rth@cygnus.com>
* recog.c (offsettable_address_p): If mode size is zero, assume
BIGGEST_ALIGNMENT.
2000-05-24 J. David Anglin <dave@hiauly.hia.nrc.ca>
* configure.in: Check for -Wno-long-long option support and improve

12
gcc/recog.c
View File

@ -1847,6 +1847,7 @@ offsettable_address_p (strictp, mode, y)
rtx *y2;
int (*addressp) PARAMS ((enum machine_mode, rtx)) =
(strictp ? strict_memory_address_p : memory_address_p);
unsigned int mode_sz = GET_MODE_SIZE (mode);
if (CONSTANT_ADDRESS_P (y))
return 1;
@ -1857,6 +1858,13 @@ offsettable_address_p (strictp, mode, y)
if (mode_dependent_address_p (y))
return 0;
/* ??? How much offset does an offsettable BLKmode reference need?
Clearly that depends on the situation in which it's being used.
However, the current situation in which we test 0xffffffff is
less than ideal. Caveat user. */
if (mode_sz == 0)
mode_sz = BIGGEST_ALIGNMENT / BITS_PER_UNIT;
/* If the expression contains a constant term,
see if it remains valid when max possible offset is added. */
@ -1865,7 +1873,7 @@ offsettable_address_p (strictp, mode, y)
int good;
y1 = *y2;
*y2 = plus_constant (*y2, GET_MODE_SIZE (mode) - 1);
*y2 = plus_constant (*y2, mode_sz - 1);
/* Use QImode because an odd displacement may be automatically invalid
for any wider mode. But it should be valid for a single byte. */
good = (*addressp) (QImode, y);
@ -1884,7 +1892,7 @@ offsettable_address_p (strictp, mode, y)
of the specified mode. We assume that if Y and Y+c are
valid addresses then so is Y+d for all 0<d<c. */
z = plus_constant_for_output (y, GET_MODE_SIZE (mode) - 1);
z = plus_constant_for_output (y, mode_sz - 1);
/* Use QImode because an odd displacement may be automatically invalid
for any wider mode. But it should be valid for a single byte. */