[gcc r12-2283] Make gimple_could_trap_p const-safe.

[gcc r12-2283] Make gimple_could_trap_p const-safe.

[Roger Sayle]

https://gcc.gnu.org/g:9aa5001ef466e6162e4acc11c6999747299474f1

commit r12-2283-g9aa5001ef466e6162e4acc11c6999747299474f1
Author: Roger Sayle <roger@nextmovesoftware.com>
Date:   Tue Jul 13 14:01:41 2021 +0100

    Make gimple_could_trap_p const-safe.
    
    Allow gimple_could_trap_p (which previously took a non-const gimple)
    to be called from functions that take a const gimple (such as
    gimple_has_side_effects), and update its prototypes.  Pre-approved
    as obvious.
    
    2021-07-13  Roger Sayle  <roger@nextmovesoftware.com>
                Richard Biener  <rguenther@suse.de>
    
    gcc/ChangeLog
            * gimple.c (gimple_could_trap_p_1):  Make S argument a
            "const gimple*".  Preserve constness in call to
            gimple_asm_volatile_p.
            (gimple_could_trap_p): Make S argument a "const gimple*".
            * gimple.h (gimple_could_trap_p_1, gimple_could_trap_p):
            Update function prototypes.

Diff:
---
 gcc/gimple.c | 6 +++---
 gcc/gimple.h | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/gcc/gimple.c b/gcc/gimple.c
index cc464547e34..0690f94971f 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -2129,7 +2129,7 @@ gimple_has_side_effects (const gimple *s)
    S is a GIMPLE_ASSIGN, the LHS of the assignment is also checked.  */
 
 bool
-gimple_could_trap_p_1 (gimple *s, bool include_mem, bool include_stores)
+gimple_could_trap_p_1 (const gimple *s, bool include_mem, bool include_stores)
 {
   tree t, div = NULL_TREE;
   enum tree_code op;
@@ -2146,7 +2146,7 @@ gimple_could_trap_p_1 (gimple *s, bool include_mem, bool include_stores)
   switch (gimple_code (s))
     {
     case GIMPLE_ASM:
-      return gimple_asm_volatile_p (as_a <gasm *> (s));
+      return gimple_asm_volatile_p (as_a <const gasm *> (s));
 
     case GIMPLE_CALL:
       if (gimple_call_internal_p (s))
@@ -2194,7 +2194,7 @@ gimple_could_trap_p_1 (gimple *s, bool include_mem, bool include_stores)
 /* Return true if statement S can trap.  */
 
 bool
-gimple_could_trap_p (gimple *s)
+gimple_could_trap_p (const gimple *s)
 {
   return gimple_could_trap_p_1 (s, true, true);
 }
diff --git a/gcc/gimple.h b/gcc/gimple.h
index be1155e262d..acf572b81be 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -1601,8 +1601,8 @@ void gimple_set_lhs (gimple *, tree);
 gimple *gimple_copy (gimple *);
 void gimple_move_vops (gimple *, gimple *);
 bool gimple_has_side_effects (const gimple *);
-bool gimple_could_trap_p_1 (gimple *, bool, bool);
-bool gimple_could_trap_p (gimple *);
+bool gimple_could_trap_p_1 (const gimple *, bool, bool);
+bool gimple_could_trap_p (const gimple *);
 bool gimple_assign_rhs_could_trap_p (gimple *);
 extern void dump_gimple_statistics (void);
 unsigned get_gimple_rhs_num_ops (enum tree_code);