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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/97653] Incorrect long double calculation with -mabi=ibmlongdouble Date: Sat, 31 Oct 2020 09:12:11 +0000 [thread overview] Message-ID: <bug-97653-4-KmDcTHOpel@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-97653-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97653 --- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- int printf(const char*, ...); const unsigned long k = 256; int main() { long double r[] = { 0.1L, 0.2L, 0.5L, 0.9L }; for (int i = 0; i < 4; ++i) { unsigned long j = k * r[i]; printf("%lu * %Lf = %lu\n", k, r[i], j); } } $ ~/gcc/ieee128/bin/gcc k.c -mno-gnu-attribute -mabi=ibmlongdouble -Wall && ./a.out 256 * 0.100000 = 256 256 * 0.200000 = 256 256 * 0.500000 = 256 256 * 0.900000 = 256
next prev parent reply other threads:[~2020-10-31 9:12 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-31 8:57 [Bug target/97653] New: " redi at gcc dot gnu.org 2020-10-31 8:58 ` [Bug target/97653] " redi at gcc dot gnu.org 2020-10-31 9:00 ` redi at gcc dot gnu.org 2020-10-31 9:12 ` redi at gcc dot gnu.org [this message] 2020-11-03 19:51 ` meissner at gcc dot gnu.org 2020-11-03 19:58 ` meissner at gcc dot gnu.org 2020-11-04 12:02 ` redi at gcc dot gnu.org 2020-12-08 14:09 ` redi at gcc dot gnu.org 2021-01-21 1:41 ` meissner at gcc dot gnu.org 2021-01-21 1:44 ` meissner at gcc dot gnu.org 2021-03-23 18:07 ` redi at gcc dot gnu.org 2021-03-23 18:08 ` redi at gcc dot gnu.org 2021-03-30 11:28 ` jakub at gcc dot gnu.org 2021-03-30 11:44 ` redi at gcc dot gnu.org 2021-03-30 11:49 ` redi at gcc dot gnu.org 2021-03-30 12:02 ` jakub at gcc dot gnu.org 2021-03-31 10:58 ` [Bug target/97653] [11 Regression] " jakub at gcc dot gnu.org 2021-03-31 11:59 ` jakub at gcc dot gnu.org 2021-03-31 12:24 ` jakub at gcc dot gnu.org 2021-04-03 8:06 ` cvs-commit at gcc dot gnu.org 2021-04-03 8:16 ` jakub at gcc dot gnu.org 2021-04-20 9:45 ` cvs-commit at gcc dot gnu.org
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