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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/82854] more missing simplifcations
Date: Sat, 07 Aug 2021 07:03:53 +0000 [thread overview]
Message-ID: <bug-82854-4-b2z32ItqMk@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-82854-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82854
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-08-07
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Summary of some of these
/* x + (x & 0x80000000) -> x & 0x7fffffff */
No one does
/* (x | 0x80000000) + 0x80000000 -> x & 0x7FFFFFFF */
LLVM does
/* x & (0x7FFFFFFF - x) -> x & 0x80000000 */
No one does, ICC does (-x + 0x7FFFFFFF) & x
/* x | (x + 0x80000000) -> x | 0x80000000 */
LLVM does
/* x | (0x7FFFFFFF - x) -> x | 0x7FFFFFFF */
No one does, ICC does (-x + 0x7FFFFFFF) | x
/* x | (x ^ y) -> x | y */
GCC and LLVM
/* -x | 0xFFFFFFFE -> x | 0xFFFFFFFE */
LLVM does
/* 0 - (x & 0x80000000) -> x & 0x80000000 */
LLVM does
/* ~(x + c) -> ~c - x */
GCC and LLVM
/* (x | c) - c -> x & ∼c */
GCC and LLVM
/* 0x7FFFFFFF - (x ^ c) -> x ^ (0x7FFFFFFF - c) */
LLVM does
next prev parent reply other threads:[~2021-08-07 7:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-82854-4@http.gcc.gnu.org/bugzilla/>
2021-08-07 6:44 ` pinskia at gcc dot gnu.org
2021-08-07 7:03 ` pinskia at gcc dot gnu.org [this message]
2023-05-02 5:24 ` pinskia at gcc dot gnu.org
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