2012-02-16 Jakub Jelinek <jakub@redhat.com>
+ PR rtl-optimization/52208
+ * ira-costs.c (scan_one_insn): Don't decrease mem_cost
+ for MEMs with REG_EQUIV, if the MEM isn't general_operand.
+
PR tree-optimization/52255
* tree-vect-loop-manip.c (slpeel_tree_peel_loop_to_edge): If
loop->header has virtual PHI, but exit_e->dest doesn't, add
/* IRA hard register and memory cost calculation for allocnos or pseudos.
- Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
+ Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012
Free Software Foundation, Inc.
Contributed by Vladimir Makarov <vmakarov@redhat.com>.
Similarly if we're loading other constants from memory (constant
pool, TOC references, small data areas, etc) and this is the only
- assignment to the destination pseudo. */
+ assignment to the destination pseudo.
+
+ Don't do this if SET_SRC (set) isn't a general operand, if it is
+ a memory requiring special instructions to load it, decreasing
+ mem_cost might result in it being loaded using the specialized
+ instruction into a register, then stored into stack and loaded
+ again from the stack. See PR52208. */
if (set != 0 && REG_P (SET_DEST (set)) && MEM_P (SET_SRC (set))
&& (note = find_reg_note (insn, REG_EQUIV, NULL_RTX)) != NULL_RTX
&& ((MEM_P (XEXP (note, 0)))
|| (CONSTANT_P (XEXP (note, 0))
&& targetm.legitimate_constant_p (GET_MODE (SET_DEST (set)),
XEXP (note, 0))
- && REG_N_SETS (REGNO (SET_DEST (set))) == 1)))
+ && REG_N_SETS (REGNO (SET_DEST (set))) == 1))
+ && general_operand (SET_SRC (set), GET_MODE (SET_SRC (set))))
{
enum reg_class cl = GENERAL_REGS;
rtx reg = SET_DEST (set);