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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/107608] New: [13 Regression] Failure on fold-overflow-1.c Date: Thu, 10 Nov 2022 09:47:55 +0000 [thread overview] Message-ID: <bug-107608-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107608 Bug ID: 107608 Summary: [13 Regression] Failure on fold-overflow-1.c Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: jakub at gcc dot gnu.org Target Milestone: --- With my https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107569#c20 patch I get +FAIL: gcc.dg/fold-overflow-1.c scan-assembler-times 2139095040 2 regression because float foo(void) { return __FLT_MAX__ + __FLT_MAX__; } no longer raises overflow exception. This case is canonicalized to return __FLT_MAX__ * 2.0f; and ranger correctly determines the result is [+Inf, +Inf], but then comes dom2 and happily replaces _1 = 3.4028234663852885981170418348451692544e+38 * 2.0e+0; return _1; with _1 = 3.4028234663852885981170418348451692544e+38 * 2.0e+0; return Inf; (I think this is still correct) and then dce3 removes the _1 = 3.4028234663852885981170418348451692544e+38 * 2.0e+0; statement. That is not correct, because -ftrapping-math is on and this multiplication is supposed to trap. Now, my patch isn't needed, if I do: float bar(void) { return __FLT_MAX__ + (__FLT_MAX__ / 4.0f); } instead, then the same regressed already on vanilla trunk: _1 = 3.4028234663852885981170418348451692544e+38 + 8.507058665963221495292604587112923136e+37; return _1; changes in dom2 to _1 = 3.4028234663852885981170418348451692544e+38 + 8.507058665963221495292604587112923136e+37; return Inf; and in dce3 to just return Inf;
next reply other threads:[~2022-11-10 9:47 UTC|newest] Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-10 9:47 jakub at gcc dot gnu.org [this message] 2022-11-10 9:49 ` [Bug tree-optimization/107608] " jakub at gcc dot gnu.org 2022-11-10 13:47 ` rguenth at gcc dot gnu.org 2022-11-10 18:13 ` pinskia at gcc dot gnu.org 2022-11-11 7:18 ` pinskia at gcc dot gnu.org 2022-11-13 6:30 ` [Bug tree-optimization/107608] [13 Regression] Failure on fold-overflow-1.c and pr95115.c xry111 at gcc dot gnu.org 2022-11-28 10:06 ` rguenth at gcc dot gnu.org 2022-12-05 13:22 ` aldyh at gcc dot gnu.org 2022-12-05 15:14 ` rguenth at gcc dot gnu.org 2022-12-05 16:30 ` aldyh at gcc dot gnu.org 2022-12-16 13:20 ` jakub at gcc dot gnu.org 2022-12-16 13:32 ` rguenth at gcc dot gnu.org 2023-01-09 15:18 ` aldyh at gcc dot gnu.org 2023-01-10 8:56 ` rguenth at gcc dot gnu.org 2023-01-10 8:58 ` rguenth at gcc dot gnu.org 2023-01-10 10:20 ` aldyh at gcc dot gnu.org 2023-01-10 10:25 ` aldyh at gcc dot gnu.org 2023-01-10 11:00 ` rguenth at gcc dot gnu.org 2023-01-10 11:09 ` jakub at gcc dot gnu.org 2023-01-10 12:08 ` rguenther at suse dot de 2023-01-10 14:14 ` jakub at gcc dot gnu.org 2023-01-10 14:25 ` amacleod at redhat dot com 2023-01-10 14:33 ` aldyh at gcc dot gnu.org 2023-01-10 14:39 ` jakub at gcc dot gnu.org 2023-01-10 14:40 ` aldyh at gcc dot gnu.org 2023-01-10 14:42 ` jakub at gcc dot gnu.org 2023-01-12 11:42 ` aldyh at gcc dot gnu.org 2023-01-12 12:03 ` jakub at gcc dot gnu.org 2023-01-12 12:26 ` xry111 at gcc dot gnu.org 2023-01-13 13:19 ` aldyh at gcc dot gnu.org 2023-01-13 13:25 ` aldyh at gcc dot gnu.org 2023-01-15 15:43 ` cvs-commit at gcc dot gnu.org 2023-01-16 21:38 ` romain.geissler at amadeus dot com 2023-01-16 21:46 ` jakub at gcc dot gnu.org 2023-01-16 21:55 ` romain.geissler at amadeus dot com 2023-01-16 21:58 ` fw at gcc dot gnu.org 2023-01-18 12:26 ` aldyh at gcc dot gnu.org 2023-01-18 12:54 ` jakub at gcc dot gnu.org 2023-01-18 12:56 ` aldyh at gcc dot gnu.org 2023-01-18 13:00 ` rguenth at gcc dot gnu.org 2023-01-18 13:03 ` rguenth at gcc dot gnu.org 2023-01-18 13:05 ` rguenth at gcc dot gnu.org 2023-01-19 1:15 ` xry111 at gcc dot gnu.org 2023-01-19 7:17 ` rguenther at suse dot de 2023-01-26 14:29 ` xry111 at gcc dot gnu.org 2023-01-27 7:35 ` rguenth at gcc dot gnu.org 2023-01-27 7:59 ` xry111 at gcc dot gnu.org 2023-01-27 9:53 ` rguenther at suse dot de 2023-01-27 10:02 ` xry111 at gcc dot gnu.org 2023-01-27 10:13 ` jakub at gcc dot gnu.org 2023-01-27 11:30 ` rguenther at suse dot de
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