public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug tree-optimization/82854] more missing simplifcations [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 2023-05-02 5:24 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-08-07 6:44 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82854 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization Severity|normal |enhancement ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/82854] more missing simplifcations [not found] <bug-82854-4@http.gcc.gnu.org/bugzilla/> 2021-08-07 6:44 ` [Bug tree-optimization/82854] more missing simplifcations pinskia at gcc dot gnu.org @ 2021-08-07 7:03 ` pinskia at gcc dot gnu.org 2023-05-02 5:24 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-08-07 7:03 UTC (permalink / raw) To: gcc-bugs 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 ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/82854] more missing simplifcations [not found] <bug-82854-4@http.gcc.gnu.org/bugzilla/> 2021-08-07 6:44 ` [Bug tree-optimization/82854] more missing simplifcations pinskia at gcc dot gnu.org 2021-08-07 7:03 ` pinskia at gcc dot gnu.org @ 2023-05-02 5:24 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-05-02 5:24 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82854 --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #2) > /* 0 - (x & 0x80000000) -> x & 0x80000000 */ > LLVM does Actually RTL has done this since at least GCC 4.1.0, most likely before. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-05-02 5:24 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <bug-82854-4@http.gcc.gnu.org/bugzilla/> 2021-08-07 6:44 ` [Bug tree-optimization/82854] more missing simplifcations pinskia at gcc dot gnu.org 2021-08-07 7:03 ` pinskia at gcc dot gnu.org 2023-05-02 5:24 ` pinskia at gcc dot gnu.org
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).