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(invariant_p): Reject const volatile references. 

From-SVN: r8666
This commit is contained in:
Jim Wilson 1994-12-19 12:27:20 -08:00
parent 3ab7aa1238
commit 667a4593fc
1 changed files with 7 additions and 3 deletions
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10
gcc/loop.c
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@ -2699,6 +2699,12 @@ invariant_p (x)
return n_times_set[REGNO (x)] == 0;
case MEM:
/* Volatile memory references must be rejected. Do this before
checking for read-only items, so that volatile read-only items
will be rejected also. */
if (MEM_VOLATILE_P (x))
return 0;
/* Read-only items (such as constants in a constant pool) are
invariant if their address is. */
if (RTX_UNCHANGING_P (x))
@ -2706,9 +2712,7 @@ invariant_p (x)
/* If we filled the table (or had a subroutine call), any location
in memory could have been clobbered. */
if (unknown_address_altered
/* Don't mess with volatile memory references. */
|| MEM_VOLATILE_P (x))
if (unknown_address_altered)
return 0;
/* See if there is any dependence between a store and this load. */