* tm.texi (POINTERS_EXTEND_UNSIGNED) Modify definition.

[thirdparty/gcc.git] / gcc / combine.c

diff --git a/gcc/combine.c b/gcc/combine.c
index b22dd9bb41b26c7c3026d2c7032719f8c6024d39..8658aadbddb1a5a2fbcf5a206b548f61ee2b480d 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -7905,7 +7905,7 @@ nonzero_bits (x, mode)
   switch (code)
     {
     case REG:
-#ifdef POINTERS_EXTEND_UNSIGNED
+#if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend)
       /* If pointers extend unsigned and this is a pointer in Pmode, say that
         all the bits above ptr_mode are known to be zero.  */
       if (POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode
@@ -8182,7 +8182,7 @@ nonzero_bits (x, mode)
        /* If pointers extend unsigned and this is an addition or subtraction
           to a pointer in Pmode, all the bits above ptr_mode are known to be
           zero.  */
-       if (POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode
+       if (POINTERS_EXTEND_UNSIGNED > 0 && GET_MODE (x) == Pmode
            && (code == PLUS || code == MINUS)
            && GET_CODE (XEXP (x, 0)) == REG && REG_POINTER (XEXP (x, 0)))
          nonzero &= GET_MODE_MASK (ptr_mode);
@@ -8363,7 +8363,7 @@ num_sign_bit_copies (x, mode)
     {
     case REG:
 
-#ifdef POINTERS_EXTEND_UNSIGNED
+#if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend)
       /* If pointers extend signed and this is a pointer in Pmode, say that
         all the bits above ptr_mode are known to be sign bit copies.  */
       if (! POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode && mode == Pmode