[gcc r15-3853] Disable add_store_equivs when -fno-expensive-optimizations

[Richard Biener]

https://gcc.gnu.org/g:0b2d3bfa38ccce0dda46aba023f64440cc638496

commit r15-3853-g0b2d3bfa38ccce0dda46aba023f64440cc638496
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Sep 24 14:21:33 2024 +0200

    Disable add_store_equivs when -fno-expensive-optimizations
    
    IRAs add_store_equivs is quadratic in the size of the function worst
    case, disable it when -fno-expensive-optimizations which means at
    -O1 and -Og.
    
            * ira.cc (ira): Gate add_store_equivs on flag_expensive_optimizations.

Diff:
---
 gcc/ira.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/ira.cc b/gcc/ira.cc
index 156541df4e6c..9950ccac70bb 100644
--- a/gcc/ira.cc
+++ b/gcc/ira.cc
@@ -5738,7 +5738,7 @@ ira (FILE *f)
     combine_and_move_insns ();
 
   /* Gather additional equivalences with memory.  */
-  if (optimize)
+  if (optimize && flag_expensive_optimizations)
     add_store_equivs ();
 
   loop_optimizer_finalize ();