https://llvm.org/bugs/show_bug.cgi?id=29034
Bug ID: 29034
Summary: [gvn-hoist] miscompile
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: zyfw...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16981
--> https://llvm.org/bugs/attachment.cgi?id=16981&action=edit
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;
}
}
}
}
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