--enable-sinking causes crash in stackifier

[lattner]

Bugzilla Link	1911
Resolution	FIXED
Resolved on	Mar 06, 2010 14:00
Version	2.1
OS	All
Attachments	testcase
CC	@nlewycky

Extended Description

llc --enable-sinking crashes on this file, it has something to do with fpstack. This comes from 447.dealII in DISABLE_LTO mode.

[lattner]

This occurs because sinking moves an FPLoad into a block with no other fp result. Because the block has no FP result, it doesn't end with an FP_REG_KILL and fpstackifier goes down hill from there.

[lattner]

I don't see a really awesome solution to this other than making fp stackifier actually global. :(

[llvmbot]

I've applied a workaround.
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20090202/073416.html

[lattner]

works for me!