[Bug sanitizer/65435] UBsan runtime error reports in OpenSSL aes_core.c

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65435

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
OpenSSL of course.  136 << 24 is not representable in int.
This is undefined behavior in C99/C11, and defined behavior in C++11.
Quoting C99 6.5.7/4:
"The result of E1 << E2 is E1 left-shifted E2 bit positions; vacated bits are
filled with zeros. If E1 has an unsigned type, the value of the result is E1 ×
2 ^ E2, reduced modulo one more than the maximum value representable in the
result type. If E1 has a signed type and nonnegative value, and E1 × 2 ^ E2 is
representable in the result type, then that is the resulting value; otherwise,
the behavior is undefined."
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/65427] [4.8/4.9/5 Regression] ICE in emit_move_insn with wide vector types
Date: Mon, 16 Mar 2015 11:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide427

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think the bug is that tree-vect-generic.c doesn't lower COND_EXPRs, only
VEC_COND_EXPRs.