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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/53100] Optimize __int128 with range information Date: Fri, 06 Aug 2021 00:33:27 +0000 [thread overview] Message-ID: <bug-53100-4-N5T4gkf5bl@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-53100-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53100 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|middle-end |tree-optimization Status|UNCONFIRMED |NEW Last reconfirmed| |2021-08-06 Keywords| |missed-optimization Ever confirmed|0 |1 --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- So in the #if 0 case we get: x_13 = (long int) a_12(D); y_15 = (long int) b_14(D); z_17 = (long int) c_16(D); t_19 = (long int) d_18(D); u_21 = (long int) e_20(D); v_23 = (long int) f_22(D); _1 = z_17 - x_13; _3 = v_23 - y_15; _5 = _1 w* _3; Notice the w* While with the original case we get: x_9 = (__int128) a_8(D); y_11 = (__int128) b_10(D); z_13 = (__int128) c_12(D); t_15 = (__int128) d_14(D); u_17 = (__int128) e_16(D); v_19 = (__int128) f_18(D); _1 = z_13 - x_9; _2 = v_19 - y_11; _3 = _1 * _2; If we had simplified/shortened: ((__int128) c_12(D)) - ((__int128) a_8(D)) to (__int128)(long)((unsigned long) c_12(D)) - ((unsigned long) a_8(D)) We might have optimized this. There might be another bug about having some PLUS_EXPR which has WRAPPING effects rather than undefined OVERFLOW which will help the casting issue.
next prev parent reply other threads:[~2021-08-06 0:33 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-04-24 7:08 [Bug middle-end/53100] New: " marc.glisse at normalesup dot org 2012-04-29 8:06 ` [Bug middle-end/53100] " marc.glisse at normalesup dot org 2012-04-29 8:43 ` marc.glisse at normalesup dot org 2012-05-01 12:47 ` marc.glisse at normalesup dot org 2021-08-06 0:33 ` pinskia at gcc dot gnu.org [this message] 2023-07-21 23:32 ` [Bug tree-optimization/53100] " pinskia at gcc dot gnu.org
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