[Bug tree-optimization/80620] gcc produces wrong code with -O3

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80620

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
For some reason func.c, compiled with -O3 is missing a couple of insns vs -O2:

$ diff -u func-O2.s func-O3.s
--- func-O2.s   2017-05-04 08:24:33.000000000 +0200
+++ func-O3.s   2017-05-04 08:23:26.000000000 +0200
@@ -19,8 +19,6 @@
        idivq   %rcx
        testq   %rax, %rax
        jne     .L7
-       movabsq $4081116982543369, %rax
-       andq    %rax, %rcx
        movq    %rcx, var_751(%rip)
        ret
        .p2align 4,,10