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re PR rtl-optimization/52208 (Useless store) 

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.

From-SVN: r184310
This commit is contained in:
Jakub Jelinek 2012-02-16 16:34:28 +01:00 committed by Jakub Jelinek
parent e20f6b4bde
commit 3db93c89bc
2 changed files with 14 additions and 3 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
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

13
gcc/ira-costs.c
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@ -1,5 +1,5 @@
/* 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>.
@ -1306,14 +1306,21 @@ scan_one_insn (rtx insn)
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);