(duplicate_loop_exit_test): Handle SUBREG in SET_DEST of loop exit

test statements.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@7654 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/jump.c b/gcc/jump.c
index 4cc90bb..0792f17 100644 (file)
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -2041,7 +2041,7 @@ static int
 duplicate_loop_exit_test (loop_start)
      rtx loop_start;
 {
-  rtx insn, set, p, link;
+  rtx insn, set, reg, p, link;
   rtx copy = 0;
   int num_insns = 0;
   rtx exitcode = NEXT_INSN (JUMP_LABEL (next_nonnote_insn (loop_start)));
@@ -2098,12 +2098,14 @@ duplicate_loop_exit_test (loop_start)
   for (insn = exitcode; insn != lastexit; insn = NEXT_INSN (insn))
     if (GET_CODE (insn) == INSN
        && (set = single_set (insn)) != 0
-       && GET_CODE (SET_DEST (set)) == REG
-       && REGNO (SET_DEST (set)) >= FIRST_PSEUDO_REGISTER
-       && regno_first_uid[REGNO (SET_DEST (set))] == INSN_UID (insn))
+       && ((reg = SET_DEST (set), GET_CODE (reg) == REG)
+           || (GET_CODE (reg) == SUBREG
+               && (reg = SUBREG_REG (reg), GET_CODE (reg) == REG)))
+       && REGNO (reg) >= FIRST_PSEUDO_REGISTER
+       && regno_first_uid[REGNO (reg)] == INSN_UID (insn))
       {
        for (p = NEXT_INSN (insn); p != lastexit; p = NEXT_INSN (p))
-         if (regno_last_uid[REGNO (SET_DEST (set))] == INSN_UID (p))
+         if (regno_last_uid[REGNO (reg)] == INSN_UID (p))
            break;
 
        if (p != lastexit)
@@ -2116,10 +2118,9 @@ duplicate_loop_exit_test (loop_start)
                bzero ((char *) reg_map, max_reg * sizeof (rtx));
              }
 
-           REG_LOOP_TEST_P (SET_DEST (set)) = 1;
+           REG_LOOP_TEST_P (reg) = 1;
 
-           reg_map[REGNO (SET_DEST (set))]
-             = gen_reg_rtx (GET_MODE (SET_DEST (set)));
+           reg_map[REGNO (reg)] = gen_reg_rtx (GET_MODE (reg));
          }
       }