[binutils-gdb] sim/cgen: initialize variable at creation in engine_run_n

[binutils-gdb] sim/cgen: initialize variable at creation in engine_run_n

[Andrew Burgess]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a09f33be653fb112586be126f3d5ab848aaed095

commit a09f33be653fb112586be126f3d5ab848aaed095
Author: Andrew Burgess <aburgess@redhat.com>
Date:   Mon Oct 24 16:55:07 2022 +0100

    sim/cgen: initialize variable at creation in engine_run_n
    
    Zero initialize engine_fns entirely at creation, then override those
    fields we intend to use, rather than zero just initializing the unused
    fields later on.
    
    There should be no user visible changes after this commit.

Diff:
---
 sim/common/cgen-run.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/sim/common/cgen-run.c b/sim/common/cgen-run.c
index a9a493c01b9..b6400a69c13 100644
--- a/sim/common/cgen-run.c
+++ b/sim/common/cgen-run.c
@@ -229,7 +229,9 @@ static void
 engine_run_n (SIM_DESC sd, int next_cpu_nr, int nr_cpus, int max_insns, int fast_p)
 {
   int i;
-  ENGINE_FN *engine_fns[MAX_NR_PROCESSORS];
+  /* Ensure that engine_fns is fully initialized, this silences a compiler
+     warning when engine_fns is used below.  */
+  ENGINE_FN *engine_fns[MAX_NR_PROCESSORS] = {};
 
   SIM_ASSERT (nr_cpus <= MAX_NR_PROCESSORS);
   SIM_ASSERT (next_cpu_nr >= 0 && next_cpu_nr < nr_cpus);
@@ -242,11 +244,6 @@ engine_run_n (SIM_DESC sd, int next_cpu_nr, int nr_cpus, int max_insns, int fast
       prime_cpu (cpu, max_insns);
     }
 
-  /* Ensure the remaining engine_fns slots are initialized, this silences a
-     compiler warning when engine_fns is used below.  */
-  for (i = nr_cpus; i < MAX_NR_PROCESSORS; ++i)
-    engine_fns[i] = NULL;
-
   while (1)
     {
       SIM_ENGINE_PREFIX_HOOK (sd);