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112 lines
2.6 KiB
Diff
112 lines
2.6 KiB
Diff
From gcc bugzilla https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60155
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Upstream status: in trunk.
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Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
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--- trunk/gcc/gcse.c 2014/02/12 14:50:06 207726
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+++ trunk/gcc/gcse.c 2014/04/04 22:25:51 209134
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@@ -2502,6 +2502,65 @@
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}
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}
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+struct set_data
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+{
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+ rtx insn;
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+ const_rtx set;
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+ int nsets;
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+};
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+
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+/* Increment number of sets and record set in DATA. */
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+
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+static void
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+record_set_data (rtx dest, const_rtx set, void *data)
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+{
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+ struct set_data *s = (struct set_data *)data;
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+
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+ if (GET_CODE (set) == SET)
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+ {
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+ /* We allow insns having multiple sets, where all but one are
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+ dead as single set insns. In the common case only a single
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+ set is present, so we want to avoid checking for REG_UNUSED
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+ notes unless necessary. */
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+ if (s->nsets == 1
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+ && find_reg_note (s->insn, REG_UNUSED, SET_DEST (s->set))
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+ && !side_effects_p (s->set))
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+ s->nsets = 0;
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+
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+ if (!s->nsets)
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+ {
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+ /* Record this set. */
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+ s->nsets += 1;
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+ s->set = set;
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+ }
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+ else if (!find_reg_note (s->insn, REG_UNUSED, dest)
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+ || side_effects_p (set))
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+ s->nsets += 1;
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+ }
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+}
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+
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+static const_rtx
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+single_set_gcse (rtx insn)
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+{
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+ struct set_data s;
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+ rtx pattern;
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+
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+ gcc_assert (INSN_P (insn));
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+
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+ /* Optimize common case. */
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+ pattern = PATTERN (insn);
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+ if (GET_CODE (pattern) == SET)
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+ return pattern;
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+
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+ s.insn = insn;
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+ s.nsets = 0;
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+ note_stores (pattern, record_set_data, &s);
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+
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+ /* Considered invariant insns have exactly one set. */
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+ gcc_assert (s.nsets == 1);
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+ return s.set;
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+}
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+
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/* Emit move from SRC to DEST noting the equivalence with expression computed
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in INSN. */
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@@ -2509,7 +2568,8 @@
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gcse_emit_move_after (rtx dest, rtx src, rtx insn)
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{
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rtx new_rtx;
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- rtx set = single_set (insn), set2;
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+ const_rtx set = single_set_gcse (insn);
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+ rtx set2;
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rtx note;
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rtx eqv = NULL_RTX;
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@@ -3369,13 +3429,12 @@
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FOR_EACH_VEC_ELT (occrs_to_hoist, j, occr)
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{
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rtx insn;
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- rtx set;
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+ const_rtx set;
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gcc_assert (!occr->deleted_p);
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insn = occr->insn;
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- set = single_set (insn);
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- gcc_assert (set);
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+ set = single_set_gcse (insn);
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/* Create a pseudo-reg to store the result of reaching
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expressions into. Get the mode for the new pseudo
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@@ -3456,10 +3515,8 @@
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{
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rtx reg;
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enum reg_class pressure_class;
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- rtx set = single_set (insn);
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+ const_rtx set = single_set_gcse (insn);
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- /* Considered invariant insns have only one set. */
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- gcc_assert (set != NULL_RTX);
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reg = SET_DEST (set);
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if (GET_CODE (reg) == SUBREG)
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reg = SUBREG_REG (reg);
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