[Bug target/78794] [7 Regression] We noticed ~9% regression in 32-bit mode for 462.libquntum on Avoton after r243202

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78794

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
Perhaps as simple as:

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 1cd1cd8..6899d4f 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -3424,7 +3424,7 @@ dimode_scalar_chain::compute_convert_gain ()
        }
       else if (GET_CODE (src) == NEG
               || GET_CODE (src) == NOT)
-       gain += ix86_cost->add - COSTS_N_INSNS (1);
+       gain += ix86_cost->add - COSTS_N_INSNS (2);
       else if (GET_CODE (src) == COMPARE)
        {
          /* Assume comparison cost is the same.  */