[03/23] reginfo: Add a global_reg_set

[Richard Sandiford via Gcc-patches]

A later patch wants to use the set of global registers as a HARD_REG_SET
rather than a bool/char array.  Most other arrays already have a
HARD_REG_SET counterpart, but this one didn't.

gcc/
        * hard-reg-set.h (global_reg_set): Declare.
        * reginfo.c (global_reg_set): New variable.
        (init_reg_sets_1, globalize_reg): Update it when globalizing
        registers.
---
 gcc/hard-reg-set.h | 2 ++
 gcc/reginfo.c      | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/gcc/hard-reg-set.h b/gcc/hard-reg-set.h
index 1ec1b4e4aa0..787da3a4f02 100644
--- a/gcc/hard-reg-set.h
+++ b/gcc/hard-reg-set.h
@@ -359,6 +359,8 @@ hard_reg_set_iter_next (hard_reg_set_iterator *iter, 
unsigned *regno)
 
 extern char global_regs[FIRST_PSEUDO_REGISTER];
 
+extern HARD_REG_SET global_reg_set;
+
 class simplifiable_subreg;
 class subreg_shape;
 
diff --git a/gcc/reginfo.c b/gcc/reginfo.c
index e34b74af9f1..cc7d17460eb 100644
--- a/gcc/reginfo.c
+++ b/gcc/reginfo.c
@@ -91,6 +91,9 @@ static const char initial_call_used_regs[] = 
CALL_USED_REGISTERS;
    and are also considered fixed.  */
 char global_regs[FIRST_PSEUDO_REGISTER];
 
+/* The set of global registers.  */
+HARD_REG_SET global_reg_set;
+
 /* Declaration for the global register. */
 tree global_regs_decl[FIRST_PSEUDO_REGISTER];
 
@@ -390,6 +393,7 @@ init_reg_sets_1 (void)
        {
          fixed_regs[i] = call_used_regs[i] = 1;
          SET_HARD_REG_BIT (fixed_reg_set, i);
+         SET_HARD_REG_BIT (global_reg_set, i);
        }
     }
 
@@ -724,6 +728,7 @@ globalize_reg (tree decl, int i)
 
   global_regs[i] = 1;
   global_regs_decl[i] = decl;
+  SET_HARD_REG_BIT (global_reg_set, i);
 
   /* If we're globalizing the frame pointer, we need to set the
      appropriate regs_invalidated_by_call bit, even if it's already
-- 
2.17.1