PR rtl-optimization/89399

	* ree.c (combine_set_extension): Use single_set rather than
	digging into PATTERN for items on the candidate list.
	(combine_reaching_defs): Likewise.

	PR rtl-optimization/89399
	* gcc.c-torture/compile/pr89399.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@270151 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 47eeed65ab7cfe965ae718591624d11e63f10921..f57c2f9c193fd361f7b3c7e8611c9de3f79bb70b 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2019-04-04  Jeff Law  <law@redhat.com>
+
+       PR rtl-optimization/89399
+       * ree.c (combine_set_extension): Use single_set rather than
+       digging into PATTERN for items on the candidate list.
+       (combine_reaching_defs): Likewise.
+
 2019-04-04  Richard Sandiford  <richard.sandiford@arm.com>
 
        PR rtl-optimization/46590

diff --git a/gcc/ree.c b/gcc/ree.c
index e23e607a5e1418c4bc20cc8a878c83b855065518..104f8dbf4357fbdd09d0eecba6f349570fde61ad 100644 (file)
--- a/gcc/ree.c
+++ b/gcc/ree.c
@@ -320,7 +320,7 @@ combine_set_extension (ext_cand *cand, rtx_insn *curr_insn, rtx *orig_set)
   rtx orig_src = SET_SRC (*orig_set);
   machine_mode orig_mode = GET_MODE (SET_DEST (*orig_set));
   rtx new_set;
-  rtx cand_pat = PATTERN (cand->insn);
+  rtx cand_pat = single_set (cand->insn);
 
   /* If the extension's source/destination registers are not the same
      then we need to change the original load to reference the destination
@@ -778,10 +778,14 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
   /* If the destination operand of the extension is a different
      register than the source operand, then additional restrictions
      are needed.  Note we have to handle cases where we have nested
-     extensions in the source operand.  */
+     extensions in the source operand.
+
+     Candidate insns are known to be single_sets, via the test in
+     find_removable_extensions.  So we continue to use single_set here
+     rather than get_sub_rtx.  */
+  rtx set = single_set (cand->insn);
   bool copy_needed
-    = (REGNO (SET_DEST (PATTERN (cand->insn)))
-       != REGNO (get_extended_src_reg (SET_SRC (PATTERN (cand->insn)))));
+    = (REGNO (SET_DEST (set)) != REGNO (get_extended_src_reg (SET_SRC (set))));
   if (copy_needed)
     {
       /* Considering transformation of
@@ -816,8 +820,8 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
       if (state->modified[INSN_UID (cand->insn)].kind != EXT_MODIFIED_NONE)
        return false;
 
-      machine_mode dst_mode = GET_MODE (SET_DEST (PATTERN (cand->insn)));
-      rtx src_reg = get_extended_src_reg (SET_SRC (PATTERN (cand->insn)));
+      machine_mode dst_mode = GET_MODE (SET_DEST (set));
+      rtx src_reg = get_extended_src_reg (SET_SRC (set));
 
       /* Ensure we can use the src_reg in dst_mode (needed for
         the (set (reg1) (reg2)) insn mentioned above).  */
@@ -852,9 +856,9 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
          || !REG_P (SET_DEST (*dest_sub_rtx)))
        return false;
 
-      rtx tmp_reg = gen_rtx_REG (GET_MODE (SET_DEST (PATTERN (cand->insn))),
+      rtx tmp_reg = gen_rtx_REG (GET_MODE (SET_DEST (set)),
                                 REGNO (SET_DEST (*dest_sub_rtx)));
-      if (reg_overlap_mentioned_p (tmp_reg, SET_DEST (PATTERN (cand->insn))))
+      if (reg_overlap_mentioned_p (tmp_reg, SET_DEST (set)))
        return false;
 
       /* On RISC machines we must make sure that changing the mode of SRC_REG
@@ -877,10 +881,8 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
 
       /* The destination register of the extension insn must not be
         used or set between the def_insn and cand->insn exclusive.  */
-      if (reg_used_between_p (SET_DEST (PATTERN (cand->insn)),
-                             def_insn, cand->insn)
-         || reg_set_between_p (SET_DEST (PATTERN (cand->insn)),
-                               def_insn, cand->insn))
+      if (reg_used_between_p (SET_DEST (set), def_insn, cand->insn)
+         || reg_set_between_p (SET_DEST (set), def_insn, cand->insn))
        return false;
 
       /* We must be able to copy between the two registers.   Generate,
@@ -894,11 +896,10 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
         is different than in the code to emit the copy as we have not
         modified the defining insn yet.  */
       start_sequence ();
-      rtx pat = PATTERN (cand->insn);
-      rtx new_dst = gen_rtx_REG (GET_MODE (SET_DEST (pat)),
-                                 REGNO (get_extended_src_reg (SET_SRC (pat))));
-      rtx new_src = gen_rtx_REG (GET_MODE (SET_DEST (pat)),
-                                 REGNO (SET_DEST (pat)));
+      rtx new_dst = gen_rtx_REG (GET_MODE (SET_DEST (set)),
+                                 REGNO (get_extended_src_reg (SET_SRC (set))));
+      rtx new_src = gen_rtx_REG (GET_MODE (SET_DEST (set)),
+                                 REGNO (SET_DEST (set)));
       emit_move_insn (new_dst, new_src);
 
       rtx_insn *insn = get_insns ();
@@ -912,7 +913,7 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
        return false;
 
       while (REG_P (SET_SRC (*dest_sub_rtx))
-            && (REGNO (SET_SRC (*dest_sub_rtx)) == REGNO (SET_DEST (pat))))
+            && (REGNO (SET_SRC (*dest_sub_rtx)) == REGNO (SET_DEST (set))))
        {
          /* Considering transformation of
             (set (reg2) (expression))
@@ -955,7 +956,7 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
             implicitly sets it in word mode.  */
          if (WORD_REGISTER_OPERATIONS && known_lt (prec, BITS_PER_WORD))
            {
-             struct df_link *uses = get_uses (def_insn2, SET_DEST (pat));
+             struct df_link *uses = get_uses (def_insn2, SET_DEST (set));
              if (!uses)
                break;
 
@@ -973,10 +974,8 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
             used or set between the def_insn2 and def_insn exclusive.
             Likewise for the other reg, i.e. check both reg1 and reg2
             in the above comment.  */
-         if (reg_used_between_p (SET_DEST (PATTERN (cand->insn)),
-                                 def_insn2, def_insn)
-             || reg_set_between_p (SET_DEST (PATTERN (cand->insn)),
-                                   def_insn2, def_insn)
+         if (reg_used_between_p (SET_DEST (set), def_insn2, def_insn)
+             || reg_set_between_p (SET_DEST (set), def_insn2, def_insn)
              || reg_used_between_p (src_reg, def_insn2, def_insn)
              || reg_set_between_p (src_reg, def_insn2, def_insn))
            break;
@@ -991,13 +990,12 @@ combine_reaching_defs (ext_cand *cand, const_rtx set_pat, ext_state *state)
   if (state->modified[INSN_UID (cand->insn)].kind != EXT_MODIFIED_NONE)
     {
       machine_mode mode;
-      rtx set;
 
       if (state->modified[INSN_UID (cand->insn)].kind
          != (cand->code == ZERO_EXTEND
              ? EXT_MODIFIED_ZEXT : EXT_MODIFIED_SEXT)
          || state->modified[INSN_UID (cand->insn)].mode != cand->mode
-         || (set = single_set (cand->insn)) == NULL_RTX)
+         || (set == NULL_RTX))
        return false;
       mode = GET_MODE (SET_DEST (set));
       gcc_assert (GET_MODE_UNIT_SIZE (mode)
@@ -1320,9 +1318,9 @@ find_and_remove_re (void)
             we do not allow the optimization of extensions where
             the source and destination registers do not match.  Thus
             checking REG_P here is correct.  */
-         if (REG_P (XEXP (SET_SRC (PATTERN (curr_cand->insn)), 0))
-             && (REGNO (SET_DEST (PATTERN (curr_cand->insn)))
-                 != REGNO (XEXP (SET_SRC (PATTERN (curr_cand->insn)), 0))))
+         rtx set = single_set (curr_cand->insn);
+         if (REG_P (XEXP (SET_SRC (set), 0))
+             && (REGNO (SET_DEST (set)) != REGNO (XEXP (SET_SRC (set), 0))))
            {
               reinsn_copy_list.safe_push (curr_cand->insn);
               reinsn_copy_list.safe_push (state.defs_list[0]);
@@ -1356,13 +1354,13 @@ find_and_remove_re (void)
         defining insn was used to eliminate a second extension
         that was wider than the first.  */
       rtx sub_rtx = *get_sub_rtx (def_insn);
-      rtx pat = PATTERN (curr_insn);
+      rtx set = single_set (curr_insn);
       rtx new_dst = gen_rtx_REG (GET_MODE (SET_DEST (sub_rtx)),
-                                REGNO (XEXP (SET_SRC (pat), 0)));
+                                REGNO (XEXP (SET_SRC (set), 0)));
       rtx new_src = gen_rtx_REG (GET_MODE (SET_DEST (sub_rtx)),
-                                REGNO (SET_DEST (pat)));
-      rtx set = gen_rtx_SET (new_dst, new_src);
-      emit_insn_after (set, def_insn);
+                                REGNO (SET_DEST (set)));
+      rtx new_set = gen_rtx_SET (new_dst, new_src);
+      emit_insn_after (new_set, def_insn);
     }
 
   /* Delete all useless extensions here in one sweep.  */

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 31c70826d2a878eda2d6076187ef527a47eca559..389ca037429e77e941139bfef12cba43dceca7b3 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-04-04  Jeff Law  <law@redhat.com>
+
+       PR rtl-optimization/89399
+       * gcc.c-torture/compile/pr89399.c: New test.
+ 
 2019-04-04  Harald Anlauf  <anlauf@gmx.de>
 
        PR fortran/89004

diff --git a/gcc/testsuite/gcc.c-torture/compile/pr89399.c b/gcc/testsuite/gcc.c-torture/compile/pr89399.c
new file mode 100644 (file)
index 0000000..ce8fbfc
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr89399.c
@@ -0,0 +1,10 @@
+extern int bar(void);
+
+short s;
+
+int foo(void)
+{
+  s = bar();
+  return s;
+}
+