[gcc(refs/users/aoliva/heads/testme)] harden cond: broaden detaching constraint

[gcc(refs/users/aoliva/heads/testme)] harden cond: broaden detaching constraint

[Alexandre Oliva]

https://gcc.gnu.org/g:13b33e79588cedfcdfd8a08c23f65dc76a92789d

commit 13b33e79588cedfcdfd8a08c23f65dc76a92789d
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Fri Nov 19 10:31:44 2021 -0300

    harden cond: broaden detaching constraint
    
    The asm statements used to prevent the hardening compares from being
    optimized out as redundant are too narrow, unintentionally forcing
    values into general registers, which is inefficient, undesirable, and
    occasionally conflicting with machine expectations as to which modes
    go in which registers.
    
    This patch extends the constraint of the asm to accept any kind of
    register, besides everything that was already accepted as a general
    operand.
    
    
    for  gcc/ChangeLog
    
            PR target/103097
            PR middle-end/103149
            * gimple-harden-conditionals.cc (detach_value): Broaden the
            asm constraints to accept any kind of register.

Diff:
---
 gcc/gimple-harden-conditionals.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/gimple-harden-conditionals.cc b/gcc/gimple-harden-conditionals.cc
index cfa2361d65b..8cf7f2cab47 100644
--- a/gcc/gimple-harden-conditionals.cc
+++ b/gcc/gimple-harden-conditionals.cc
@@ -132,13 +132,13 @@ detach_value (location_t loc, gimple_stmt_iterator *gsip, tree val)
   tree ret = make_ssa_name (TREE_TYPE (val));
   SET_SSA_NAME_VAR_OR_IDENTIFIER (ret, SSA_NAME_IDENTIFIER (val));
 
-  /* Output asm ("" : "=g" (ret) : "0" (val));  */
+  /* Output asm ("" : "=gX" (ret) : "0" (val));  */
   vec<tree, va_gc> *inputs = NULL;
   vec<tree, va_gc> *outputs = NULL;
   vec_safe_push (outputs,
 		 build_tree_list
 		 (build_tree_list
-		  (NULL_TREE, build_string (2, "=g")),
+		  (NULL_TREE, build_string (3, "=gX")),
 		  ret));
   vec_safe_push (inputs,
 		 build_tree_list