[Bug c/78408] Aggressive optimization of zeroing results in incorrect behavior

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78408

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-11-17
                 CC|                            |trippels at gcc dot gnu.org
      Known to work|                            |7.0
     Ever confirmed|0                           |1
      Known to fail|                            |5.4.0, 6.2.1

--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Confirmed. Trunk is fine.

--- good        2016-11-17 21:45:22.671247332 +0100
+++ bad 2016-11-17 21:45:18.851324283 +0100
@@ -58,11 +58,6 @@
        call    write
        testq   %rax, %rax
        jle     .L10
-       leaq    -65536(%rbp), %rax
-       movl    $65520, %edx
-       movl    $0, %esi
-       movq    %rax, %rdi
-       call    memset
        leaq    -131056(%rbp), %rax
        leaq    -65536(%rbp), %rcx
        movl    $65520, %edx
@@ -86,5 +81,5 @@
        .cfi_endproc
 .LFE0:
        .size   main, .-main
-       .ident  "GCC: (GNU) 7.0.0 20161117 (experimental)"
+       .ident  "GCC: (GNU) 6.2.1 20161017"
        .section        .note.GNU-stack,"",@progbits