re PR middle-end/6963 (Linux kernel miscompile due to clobbered MEM_SIZE)
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: r54913
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@ -1,3 +1,9 @@
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2002-06-22 Ulrich Weigand <uweigand@de.ibm.com>
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PR middle-end/6963
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* function.c (assign_stack_temp_for_type): Do not return
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the same MEM rtx for multiple uses of a stack slot.
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2002-06-22 David S. Miller <davem@redhat.com>
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PR target/6841 target/6770 target/6719
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@ -666,6 +666,7 @@ assign_stack_temp_for_type (mode, size, keep, type)
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{
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unsigned int align;
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struct temp_slot *p, *best_p = 0;
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rtx slot;
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/* If SIZE is -1 it means that somebody tried to allocate a temporary
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of a variable size. */
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@ -811,29 +812,26 @@ assign_stack_temp_for_type (mode, size, keep, type)
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p->keep = keep;
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}
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/* We may be reusing an old slot, so clear any MEM flags that may have been
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set from before. */
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RTX_UNCHANGING_P (p->slot) = 0;
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MEM_IN_STRUCT_P (p->slot) = 0;
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MEM_SCALAR_P (p->slot) = 0;
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MEM_VOLATILE_P (p->slot) = 0;
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set_mem_alias_set (p->slot, 0);
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/* Create a new MEM rtx to avoid clobbering MEM flags of old slots. */
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slot = gen_rtx_MEM (mode, XEXP (p->slot, 0));
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stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, slot, stack_slot_list);
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/* If we know the alias set for the memory that will be used, use
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it. If there's no TYPE, then we don't know anything about the
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alias set for the memory. */
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set_mem_alias_set (p->slot, type ? get_alias_set (type) : 0);
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set_mem_align (p->slot, align);
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set_mem_alias_set (slot, type ? get_alias_set (type) : 0);
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set_mem_align (slot, align);
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/* If a type is specified, set the relevant flags. */
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if (type != 0)
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{
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RTX_UNCHANGING_P (p->slot) = TYPE_READONLY (type);
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MEM_VOLATILE_P (p->slot) = TYPE_VOLATILE (type);
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MEM_SET_IN_STRUCT_P (p->slot, AGGREGATE_TYPE_P (type));
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RTX_UNCHANGING_P (slot) = TYPE_READONLY (type);
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MEM_VOLATILE_P (slot) = TYPE_VOLATILE (type);
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MEM_SET_IN_STRUCT_P (slot, AGGREGATE_TYPE_P (type));
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}
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return p->slot;
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return slot;
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}
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/* Allocate a temporary stack slot and record it for possible later
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