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* [gcc(refs/users/guojiufu/heads/guojiufu-branch)] PR bootstrap/95555 - powepc64 bootstrap failure due to -Wmaybe-uninitialized in reload_cse_simplify_
@ 2020-06-10  3:45 Jiu Fu Guo
  0 siblings, 0 replies; only message in thread
From: Jiu Fu Guo @ 2020-06-10  3:45 UTC (permalink / raw)
  To: gcc-cvs

https://gcc.gnu.org/g:c1057cc0a8ad972e0a2218ab74038a56e5514c39

commit c1057cc0a8ad972e0a2218ab74038a56e5514c39
Author: Martin Sebor <msebor@redhat.com>
Date:   Mon Jun 8 09:06:48 2020 -0600

    PR bootstrap/95555 - powepc64 bootstrap failure due to -Wmaybe-uninitialized in reload_cse_simplify_operands
    
    gcc/ChangeLog:
    
            * postreload.c (reload_cse_simplify_operands): Clear first array element
            before using it.  Assert a precondition.

Diff:
---
 gcc/postreload.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gcc/postreload.c b/gcc/postreload.c
index f6258285022..c9e637500f1 100644
--- a/gcc/postreload.c
+++ b/gcc/postreload.c
@@ -592,6 +592,13 @@ reload_cse_simplify_operands (rtx_insn *insn, rtx testreg)
 	}
     }
 
+  /* The loop below sets alternative_order[0] but -Wmaybe-uninitialized
+     can't know that.  Clear it here to avoid the warning.  */
+  alternative_order[0] = 0;
+  gcc_assert (!recog_data.n_alternatives
+	      || (which_alternative >= 0
+		  && which_alternative < recog_data.n_alternatives));
+
   /* Record all alternatives which are better or equal to the currently
      matching one in the alternative_order array.  */
   for (i = j = 0; i < recog_data.n_alternatives; i++)


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2020-06-10  3:45 [gcc(refs/users/guojiufu/heads/guojiufu-branch)] PR bootstrap/95555 - powepc64 bootstrap failure due to -Wmaybe-uninitialized in reload_cse_simplify_ Jiu Fu Guo

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