[Bug c/47796] The code to write to a bit_field data strucuture will be removed unexpectedly with gcc 4.5.1 -O2 option

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47796 --- Comment #7 from qihua.dai at intel dot com 2011-02-21 13:02:41 UTC --- Hi, I used -Wall -O2. But no warning for this situation. gcc will print strict-aliasing related warning. struct tmp1_s tmp; tmp.a = 0xc; // this code line is

[Bug c/47796] The code to write to a bit_field data strucuture will be removed unexpectedly with gcc 4.5.1 -O2 option

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47796 qihua.dai at intel dot com changed: What|Removed |Added Status|RESOLVED|UNCONFIRMED

[Bug c/47796] The code to write to a bit_field data strucuture will be removed unexpectedly with gcc 4.5.1 -O2 option

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47796 qihua.dai at intel dot com changed: What|Removed |Added Status|RESOLVED|UNCONFIRMED

[Bug c/47796] The code to write to a bit_field data strucuture will be removed unexpectedly with gcc 4.5.1 -O2 option

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47796 --- Comment #2 from qihua.dai at intel dot com 2011-02-18 07:54:15 UTC --- (In reply to comment #1) > You are violating C/C++ aliasing rules: > pData = (unsigned int *)pTmp; > data = *pData; > printf("data = 0x%x

[Bug c/47796] New: The code to write to a bit_field data strucuture will be removed unexpectedly with gcc 4.5.1 -O2 option

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47796 Summary: The code to write to a bit_field data strucuture will be removed unexpectedly with gcc 4.5.1 -O2 option Product: gcc Version: 4.5.1 Status: UNCONFIRMED Severity: cr