cse.c (is_dead_reg): Change argument to const_rtx.
gcc/ * cse.c (is_dead_reg): Change argument to const_rtx. (dead_debug_insn_data): Delete. (is_dead_debug_insn): Expand commentary. Turn from being a for_each_rtx callback to being a function that examines each subrtx itself. Take the fields of dead_debug_insn_data as argument. (delete_trivially_dead_insns): Update call accordingly. From-SVN: r214630
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@ -1,3 +1,13 @@
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2014-08-28 Richard Sandiford <rdsandiford@googlemail.com>
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* cse.c (is_dead_reg): Change argument to const_rtx.
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(dead_debug_insn_data): Delete.
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(is_dead_debug_insn): Expand commentary. Turn from being a
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for_each_rtx callback to being a function that examines
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each subrtx itself. Take the fields of dead_debug_insn_data
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as argument.
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(delete_trivially_dead_insns): Update call accordingly.
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2014-08-28 Richard Sandiford <rdsandiford@googlemail.com>
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* cse.c (check_for_label_ref): Move earlier in file. Turn from
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54
gcc/cse.c
54
gcc/cse.c
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@ -6784,7 +6784,7 @@ count_reg_usage (rtx x, int *counts, rtx dest, int incr)
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/* Return true if X is a dead register. */
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static inline int
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is_dead_reg (rtx x, int *counts)
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is_dead_reg (const_rtx x, int *counts)
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{
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return (REG_P (x)
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&& REGNO (x) >= FIRST_PSEUDO_REGISTER
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@ -6871,30 +6871,29 @@ count_stores (rtx x, const_rtx set ATTRIBUTE_UNUSED, void *data)
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counts[REGNO (x)]++;
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}
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struct dead_debug_insn_data
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/* Return if DEBUG_INSN pattern PAT needs to be reset because some dead
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pseudo doesn't have a replacement. COUNTS[X] is zero if register X
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is dead and REPLACEMENTS[X] is null if it has no replacemenet.
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Set *SEEN_REPL to true if we see a dead register that does have
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a replacement. */
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static bool
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is_dead_debug_insn (const_rtx pat, int *counts, rtx *replacements,
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bool *seen_repl)
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{
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int *counts;
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rtx *replacements;
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bool seen_repl;
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};
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/* Return if a DEBUG_INSN needs to be reset because some dead
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pseudo doesn't have a replacement. Callback for for_each_rtx. */
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static int
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is_dead_debug_insn (rtx *loc, void *data)
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{
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rtx x = *loc;
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struct dead_debug_insn_data *ddid = (struct dead_debug_insn_data *) data;
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if (is_dead_reg (x, ddid->counts))
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subrtx_iterator::array_type array;
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FOR_EACH_SUBRTX (iter, array, pat, NONCONST)
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{
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if (ddid->replacements && ddid->replacements[REGNO (x)] != NULL_RTX)
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ddid->seen_repl = true;
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else
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return 1;
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const_rtx x = *iter;
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if (is_dead_reg (x, counts))
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{
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if (replacements && replacements[REGNO (x)] != NULL_RTX)
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*seen_repl = true;
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else
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return true;
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}
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}
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return 0;
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return false;
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}
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/* Replace a dead pseudo in a DEBUG_INSN with replacement DEBUG_EXPR.
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@ -7038,22 +7037,19 @@ delete_trivially_dead_insns (rtx_insn *insns, int nreg)
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if (MAY_HAVE_DEBUG_INSNS)
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{
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struct dead_debug_insn_data ddid;
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ddid.counts = counts;
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ddid.replacements = replacements;
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for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
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if (DEBUG_INSN_P (insn))
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{
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/* If this debug insn references a dead register that wasn't replaced
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with an DEBUG_EXPR, reset the DEBUG_INSN. */
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ddid.seen_repl = false;
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if (for_each_rtx (&INSN_VAR_LOCATION_LOC (insn),
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is_dead_debug_insn, &ddid))
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bool seen_repl = false;
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if (is_dead_debug_insn (INSN_VAR_LOCATION_LOC (insn),
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counts, replacements, &seen_repl))
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{
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INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC ();
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df_insn_rescan (insn);
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}
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else if (ddid.seen_repl)
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else if (seen_repl)
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{
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INSN_VAR_LOCATION_LOC (insn)
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= simplify_replace_fn_rtx (INSN_VAR_LOCATION_LOC (insn),
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