[gcc r13-1814] Tweaks to global ranges.

[gcc r13-1814] Tweaks to global ranges.

[Aldy Hernandez]

https://gcc.gnu.org/g:164758b02c44cba66e00103c118c6a4b5f76a812

commit r13-1814-g164758b02c44cba66e00103c118c6a4b5f76a812
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Wed Jul 20 20:37:45 2022 +0200

    Tweaks to global ranges.
    
    The global get_nonzero_bits was previously returning -1 for
    unsupported types.  I dropped this in the conversion to global ranges
    and it's causing a problem in the frange work, where CCP is asking for
    the nonzero bits of non-integral types.  CCP may require further
    tweaks, but for now, restore the original behavior.
    
    Also, I'm removing old checks for precision that no longer hold, now
    that we handle various types for global ranges.
    
    Tested on x86-64 Linux.
    
    gcc/ChangeLog:
    
            * tree-ssanames.cc (get_nonzero_bits): Return -1 for unsupported
            types.
            * value-query.cc (get_ssa_name_range_info): Remove precision check.

Diff:
---
 gcc/tree-ssanames.cc | 3 +--
 gcc/value-query.cc   | 9 +++------
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/gcc/tree-ssanames.cc b/gcc/tree-ssanames.cc
index 9389454a5a7..5c5d0e346c4 100644
--- a/gcc/tree-ssanames.cc
+++ b/gcc/tree-ssanames.cc
@@ -489,13 +489,12 @@ get_nonzero_bits (const_tree name)
       return wi::shwi (-1, precision);
     }
 
-  if (!range_info_p (name))
+  if (!range_info_p (name) || !irange::supports_p (TREE_TYPE (name)))
     return wi::shwi (-1, precision);
 
   /* Optimization to get at the nonzero bits because we know the
      storage type.  This saves us measurable time compared to going
      through vrange_storage.  */
-  gcc_checking_assert (irange::supports_p (TREE_TYPE (name)));
   irange_storage_slot *ri
     = static_cast <irange_storage_slot *> (SSA_NAME_RANGE_INFO (name));
   return ri->get_nonzero_bits ();
diff --git a/gcc/value-query.cc b/gcc/value-query.cc
index 51911bdd1d0..3560d19f1ae 100644
--- a/gcc/value-query.cc
+++ b/gcc/value-query.cc
@@ -280,16 +280,13 @@ get_ssa_name_range_info (vrange &r, const_tree name)
 
   void *ri = SSA_NAME_RANGE_INFO (name);
 
-  // Return VR_VARYING for SSA_NAMEs with NULL RANGE_INFO or SSA_NAMEs
-  // with integral types width > 2 * HOST_BITS_PER_WIDE_INT precision.
-  if (!ri || (GET_MODE_PRECISION (SCALAR_INT_TYPE_MODE (TREE_TYPE (name)))
-	      > 2 * HOST_BITS_PER_WIDE_INT))
-    r.set_varying (type);
-  else
+  if (ri)
     {
       vrange_storage vstore (NULL);
       vstore.get_vrange (ri, r, TREE_TYPE (name));
     }
+  else
+    r.set_varying (type);
 }
 
 // Return nonnull attribute of pointer NAME from SSA_NAME_PTR_INFO.