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re PR middle-end/6963 (Linux kernel miscompile due to clobbered MEM_SIZE)

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PR middle-end/6963
	* function.c (assign_stack_temp_for_type): Do not return
	the same MEM rtx for multiple uses of a stack slot.

From-SVN: r54912
This commit is contained in:
Ulrich Weigand 2002-06-22 14:26:53 +00:00 committed by Ulrich Weigand
parent 7ae3e57c3a
commit faa964e5dd
2 changed files with 17 additions and 13 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2002-06-22 Ulrich Weigand <uweigand@de.ibm.com>
PR middle-end/6963
* function.c (assign_stack_temp_for_type): Do not return
the same MEM rtx for multiple uses of a stack slot.
2002-06-22 David S. Miller <davem@redhat.com>
PR target/6841 target/6770 target/6719

24
gcc/function.c
View File

@ -642,6 +642,7 @@ assign_stack_temp_for_type (mode, size, keep, type)
{
unsigned int align;
struct temp_slot *p, *best_p = 0;
rtx slot;
/* If SIZE is -1 it means that somebody tried to allocate a temporary
of a variable size. */
@ -787,29 +788,26 @@ assign_stack_temp_for_type (mode, size, keep, type)
p->keep = keep;
}
/* We may be reusing an old slot, so clear any MEM flags that may have been
set from before. */
RTX_UNCHANGING_P (p->slot) = 0;
MEM_IN_STRUCT_P (p->slot) = 0;
MEM_SCALAR_P (p->slot) = 0;
MEM_VOLATILE_P (p->slot) = 0;
set_mem_alias_set (p->slot, 0);
/* Create a new MEM rtx to avoid clobbering MEM flags of old slots. */
slot = gen_rtx_MEM (mode, XEXP (p->slot, 0));
stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, slot, stack_slot_list);
/* If we know the alias set for the memory that will be used, use
it. If there's no TYPE, then we don't know anything about the
alias set for the memory. */
set_mem_alias_set (p->slot, type ? get_alias_set (type) : 0);
set_mem_align (p->slot, align);
set_mem_alias_set (slot, type ? get_alias_set (type) : 0);
set_mem_align (slot, align);
/* If a type is specified, set the relevant flags. */
if (type != 0)
{
RTX_UNCHANGING_P (p->slot) = TYPE_READONLY (type);
MEM_VOLATILE_P (p->slot) = TYPE_VOLATILE (type);
MEM_SET_IN_STRUCT_P (p->slot, AGGREGATE_TYPE_P (type));
RTX_UNCHANGING_P (slot) = TYPE_READONLY (type);
MEM_VOLATILE_P (slot) = TYPE_VOLATILE (type);
MEM_SET_IN_STRUCT_P (slot, AGGREGATE_TYPE_P (type));
}
return p->slot;
return slot;
}
/* Allocate a temporary stack slot and record it for possible later