* builtins.c (purge_builtin_constant_p): Handle subreg of

[pf3gnuchains/gcc-fork.git] / gcc / builtins.c

diff --git a/gcc/builtins.c b/gcc/builtins.c
index 81e38db..d2505cd 100644 (file)
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -4952,9 +4952,12 @@ purge_builtin_constant_p ()
   for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
     if (INSN_P (insn)
        && (set = single_set (insn)) != NULL_RTX
-       && GET_CODE (SET_SRC (set)) == CONSTANT_P_RTX)
+       && (GET_CODE (arg = SET_SRC (set)) == CONSTANT_P_RTX
+           || (GET_CODE (arg) == SUBREG
+               && (GET_CODE (arg = SUBREG_REG (arg))
+                   == CONSTANT_P_RTX))))
       {
-       arg = XEXP (SET_SRC (set), 0);
+       arg = XEXP (arg, 0);
        new = CONSTANT_P (arg) ? const1_rtx : const0_rtx;
        validate_change (insn, &SET_SRC (set), new, 0);