| Issue |
117838
|
| Summary |
-deadargelim doesn't eliminate unused argument and parameter
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
hackhaye
|
Recently, I compiled binutils-2.43.1 with llvm-18 in -O2 and -deadargelim, but i found that the unused parameter of function bfd_hash_entry and argument in its callsite, both aren't eliminated. the source code of bfd_hash_entry in addr2line list below:
> struct bfd_hash_entry *
bfd_hash_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string ATTRIBUTE_UNUSED)
{
if (entry == NULL)
entry = (struct bfd_hash_entry *) bfd_hash_allocate (table,
sizeof (* entry));
return entry;
}
part of the bitcode with -O2 and -deadargelim flag on lists below
> define dso_local ptr @bfd_hash_newfunc(ptr noundef readnone %0, ptr nocapture noundef readonly %1, ptr nocapture readnone %2) local_unnamed_addr #0 {
%4 = icmp eq ptr %0, null
br i1 %4, label %5, label %21
it's quite interesting, why in this situation the dead argument and parameter are not killed? Is this due to inadequate optimization implementations.
![]()
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
