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From: aaron@cs.wisc.edu To: gcc-gnats@gcc.gnu.org Subject: c/10430: converting double word to quad word, cltd, cdq, 3.2.2 Date: Fri, 18 Apr 2003 00:06:00 -0000 [thread overview] Message-ID: <20030418000442.7178.qmail@sources.redhat.com> (raw) >Number: 10430 >Category: c >Synopsis: converting double word to quad word, cltd, cdq, 3.2.2 >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Fri Apr 18 00:06:00 UTC 2003 >Closed-Date: >Last-Modified: >Originator: Aaron Wegner >Release: unknown-1.0 >Organization: >Environment: i686-pc-linux-gnu >Description: ------- Problem ------- The problem is that cldt will replace whatever is in %edx with zeros or ones. Correct code omits cldt. -------- C Source -------- main() { foo((unsigned long long int) bar()); } ------------------------- Generated Assember Source ------------------------- .file "test.c" .text .globl main .type main,@function main: pushl %ebp movl %esp, %ebp subl $8, %esp andl $-16, %esp movl $0, %eax subl %eax, %esp call bar cltd movl %eax, (%esp) movl %edx, 4(%esp) call foo leave ret .Lfe1: .size main,.Lfe1-main .ident "GCC: (GNU) 3.2.2" >How-To-Repeat: gcc -S test.c >Fix: Unsure still. >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2003-04-18 0:06 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-04-18 0:06 aaron [this message] 2003-04-18 7:45 ebotcazou
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