incorrect gvn memcpy simplification

[llvmbot]

Bugzilla Link	2077
Resolution	FIXED
Resolved on	Feb 24, 2008 22:08
Version	unspecified
OS	Linux
Attachments	testcase .ll
Reporter	LLVM Bugzilla Contributor

Extended Description

The function @​badly_optimized does:

initialize %memtmp (by calling @​initialize)
memcpy %memtmp to %tmp
memcpy %tmp to %z
pass %z to @​passed_uninitialized

After GVN (opt -gvn) it does:

initialize %tmp (by calling @​initialize)
memcpy %memtmp to %z <= This is not "memcpy %tmp to %z"!
pass %z to @​passed_uninitialized

[llvmbot]

Fixed in r47544.