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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [gvn-hoist] miscompile"
href="https://llvm.org/bugs/show_bug.cgi?id=29034">29034</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[gvn-hoist] miscompile
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zyfwong@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16981" name="attach_16981" title="before opt -gvn-hoist">attachment 16981</a> <a href="attachment.cgi?id=16981&action=edit" title="before opt -gvn-hoist">[details]</a></span>
before opt -gvn-hoist
gvn-hoist seems to hoist a store before load:
the c code is something like:
void music_task(void *p)
{
MUSIC_OP_API *mapi=((void*)0);
dec_inf_t *dec_info=((void*)0);
u32 err;
tbool file_auto_next = 1;
music_decoder_init(&mapi);
while(1)
{
err =
music_play_api(mapi,DEV_SEL_CUR,0,PLAY_SPEC_FILE,&(mapi->dop_api->file_num));
while(0 != err)
{
u32 status;
switch(err)
{
case SUCC_MUSIC_START_DEC:
err = 0;
printf("s_num:%d\n",mapi->dop_api->file_num); /// <-------
after -gvn-hoist, mapi->do_api->file_num will always be 1
break;
case FILE_OP_ERR_END_FILE:
mapi->dop_api->file_num = 1;
err =
music_play_api(mapi,DEV_SEL_NEXT,0,PLAY_FIRST_FILE,&(mapi->dop_api->file_num));
break;
case FILE_OP_ERR_PRE_FILE:
mapi->dop_api->file_num = 1;
err =
music_play_api(mapi,DEV_SEL_PREV,0,PLAY_LAST_FILE,&(mapi->dop_api->file_num));
break;
default:
err = music_play_api(mapi,DEV_SEL_CUR,0,PLAY_NEXT_FILE,0);
break;
}
}
}
}</pre>
</div>
</p>
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