83d0488b79
The previous code processed the users of a stack slot in order of decreasing size and allocated the slot based on the first user. This seems a bit dangerous, since the ordering is based on the mode of the biggest reference while the allocation is based also on the size of the register itself (which I think could be larger). That scheme doesn't scale well to polynomial sizes, since there's no guarantee that the order of the sizes is known at compile time. This patch instead records an upper bound on the size required by all users of a slot. It also records the maximum alignment requirement. gcc/ 2016-11-15 Richard Sandiford <richard.sandiford@arm.com> Alan Hayward <alan.hayward@arm.com> David Sherwood <david.sherwood@arm.com> * function.h (spill_slot_alignment): Declare. * function.c (spill_slot_alignment): New function. * lra-spills.c (slot): Add align and size fields. (assign_mem_slot): Use them in the call to assign_stack_local. (add_pseudo_to_slot): Update the fields. (assign_stack_slot_num_and_sort_pseudos): Initialise the fields. Co-Authored-By: Alan Hayward <alan.hayward@arm.com> Co-Authored-By: David Sherwood <david.sherwood@arm.com> From-SVN: r242863 |
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