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[Ree] Ensure inserted copy don't change the number of hard registers

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2014-09-12  Wilco Dijkstra  <wilco.dijkstra@arm.com>

  gcc/
    * ree.c (combine_reaching_defs): Ensure inserted copy don't change the
    number of hard registers.

From-SVN: r215205
This commit is contained in:
Wilco Dijkstra 2014-09-12 09:29:16 +00:00 committed by Jiong Wang
parent 6ead0238de
commit e533e26c0a
2 changed files with 14 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-09-12 Wilco Dijkstra <wilco.dijkstra@arm.com>
* gcc/ree.c (combine_reaching_defs): Ensure inserted copy don't change
the number of hard registers.
2014-09-12 Alexander Ivchenko <alexander.ivchenko@intel.com>
Maxim Kuznetsov <maxim.kuznetsov@intel.com>
Anna Tikhonova <anna.tikhonova@intel.com>

10
gcc/ree.c
View File

@ -743,6 +743,14 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
if (!SCALAR_INT_MODE_P (GET_MODE (SET_DEST (PATTERN (cand->insn)))))
return false;
enum machine_mode dst_mode = GET_MODE (SET_DEST (PATTERN (cand->insn)));
rtx src_reg = get_extended_src_reg (SET_SRC (PATTERN (cand->insn)));
/* Ensure the number of hard registers of the copy match. */
if (HARD_REGNO_NREGS (REGNO (src_reg), dst_mode)
!= HARD_REGNO_NREGS (REGNO (src_reg), GET_MODE (src_reg)))
return false;
/* There's only one reaching def. */
rtx_insn *def_insn = state->defs_list[0];
@ -792,7 +800,7 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
start_sequence ();
rtx pat = PATTERN (cand->insn);
rtx new_dst = gen_rtx_REG (GET_MODE (SET_DEST (pat)),
REGNO (XEXP (SET_SRC (pat), 0)));
REGNO (get_extended_src_reg (SET_SRC (pat))));
rtx new_src = gen_rtx_REG (GET_MODE (SET_DEST (pat)),
REGNO (SET_DEST (pat)));
emit_move_insn (new_dst, new_src);