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From: balpreet.singh@adelantetech.com To: gcc-gnats@gcc.gnu.org Subject: c/9348: error in int to unsigned long multiplication on hp Date: Fri, 17 Jan 2003 10:36:00 -0000 [thread overview] Message-ID: <20030117103313.10632.qmail@sources.redhat.com> (raw) >Number: 9348 >Category: c >Synopsis: error in int to unsigned long multiplication on hp >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Fri Jan 17 02:36:00 PST 2003 >Closed-Date: >Last-Modified: >Originator: Balpreet Singh >Release: 3.2.1 >Organization: >Environment: >Description: multiplication of int/long values converted to unsigned long long generates wrong results. compile the following code with gcc... ll.c << #include <stdio.h> #define u_l_l unsigned long long #define l_l long long l_l mpy_res; u_l_l mpy (long a, long b) { return (u_l_l) a * (u_l_l) b; } <<EOF int main(void) { mpy_res = mpy(1,-1); printf("dec %lld\n hex %llx\n want %llx\n", (l_l) mpy_res, (l_l) mpy_res, -1LL); } $>gcc ll.c $>a.out dec 8589934591 hex 1ffffffff want ffffffffffffffff >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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