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[COMMITTED] Add global setter for value/mask pair for SSA names.

Message ID 20230717071603.242424-2-aldyh@redhat.com
State New
Headers show
Series [COMMITTED] Add global setter for value/mask pair for SSA names. | expand

Commit Message

Aldy Hernandez July 17, 2023, 7:16 a.m. UTC 
This patch provides a way to set the value/mask pair of known bits
globally, similarly to how we can use set_nonzero_bits for known 0
bits.  This can then be used by CCP and IPA to set value/mask info
instead of throwing away the known 1 bits.

In further clean-ups, I will see if it makes sense to remove
set_nonzero_bits altogether, since it is subsumed by value/mask.

gcc/ChangeLog:

	* tree-ssanames.cc (set_bitmask): New.
	* tree-ssanames.h (set_bitmask): New.
---
 gcc/tree-ssanames.cc | 15 +++++++++++++++
 gcc/tree-ssanames.h  |  1 +
 2 files changed, 16 insertions(+)
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Patch

diff --git a/gcc/tree-ssanames.cc b/gcc/tree-ssanames.cc
index 5fdb6a37e9f..f54394363a0 100644
--- a/gcc/tree-ssanames.cc
+++ b/gcc/tree-ssanames.cc
@@ -465,6 +465,21 @@  set_nonzero_bits (tree name, const wide_int &mask)
   set_range_info (name, r);
 }
 
+/* Update the known bits of NAME.
+
+   Zero bits in MASK cover constant values.  Set bits in MASK cover
+   unknown values.  VALUE are the known bits.  */
+
+void
+set_bitmask (tree name, const wide_int &value, const wide_int &mask)
+{
+  gcc_assert (!POINTER_TYPE_P (TREE_TYPE (name)));
+
+  int_range<2> r (TREE_TYPE (name));
+  r.update_bitmask (irange_bitmask (value, mask));
+  set_range_info (name, r);
+}
+
 /* Return a widest_int with potentially non-zero bits in SSA_NAME
    NAME, the constant for INTEGER_CST, or -1 if unknown.  */
 
diff --git a/gcc/tree-ssanames.h b/gcc/tree-ssanames.h
index f3fa609208a..b5e3f228ee8 100644
--- a/gcc/tree-ssanames.h
+++ b/gcc/tree-ssanames.h
@@ -59,6 +59,7 @@  struct GTY(()) ptr_info_def
 /* Sets the value range to SSA.  */
 extern bool set_range_info (tree, const vrange &);
 extern void set_nonzero_bits (tree, const wide_int &);
+extern void set_bitmask (tree, const wide_int &value, const wide_int &mask);
 extern wide_int get_nonzero_bits (const_tree);
 extern bool ssa_name_has_boolean_range (tree);
 extern void init_ssanames (struct function *, int);