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Author SHA1 Message Date
Eli Friedman 98f8bba283 [LivePhysRegs] Fix handling of return instructions. 
See D42509 for the original version of this.

Basically, there are two significant changes to behavior here:

- addLiveOuts always adds all pristine registers (even if a block has
no successors).
- addLiveOuts and addLiveOutsNoPristines always add all callee-saved
registers for return blocks (including conditional return blocks).

I cleaned up the functions a bit to make it clear these properties hold.

Differential Revision: https://reviews.llvm.org/D42655

llvm-svn: 324422
 2018-02-06 23:00:17 +00:00
Eli Friedman 804d7ab811 Revert r323559 due to EXPENSIVE_CHECKS regression. 
I have a fix for the issue (https://reviews.llvm.org/D42655) but
it's taking a while to get reviewed, so reverting in the meantime.

llvm-svn: 323841
 2018-01-31 00:40:42 +00:00
Eli Friedman 29108843ff [LivePhysRegs] Preserve pristine regs in blocks with no successors. 
One common source of blocks with no successors is calls to noreturn
functions; we want to preserve pristine registers in case they throw an
exception.

The whole pristine register thing is messy (we should really prefer to
explicitly model registers), but this fills a hole in the model for now.

Fixes https://bugs.llvm.org/show_bug.cgi?id=36073.

Differential Revision: https://reviews.llvm.org/D42509

llvm-svn: 323559
 2018-01-26 20:23:00 +00:00