Richard Sandiford 39f379d037 [SystemZ] Use BRCT and BRCTG to eliminate add-&-compare sequences ... This patch just uses a peephole test for "add; compare; branch" sequences within a single block. The IR optimizers already convert loops to decrement-and-branch-on-nonzero form in some cases, so even this simplistic test triggers many times during a clang bootstrap and projects/test-suite run. It looks like there are still cases where we need to more strongly prefer branches on nonzero though. E.g. I saw a case where a loop that started out with a check for 0 ended up with a check for -1. I'll try to look at that sometime. I ended up adding the Reference class because MachineInstr::readsRegister() doesn't check for subregisters (by design, as far as I could tell). llvm-svn: 187723		2013-08-05 11:23:46 +00:00
..
branch-range-01.py
branch-range-02.py
branch-range-03.py
branch-range-04.py
branch-range-05.py	[SystemZ] Two tests missing from previous commit	2013-05-29 11:59:26 +00:00
branch-range-06.py	[SystemZ] Two tests missing from previous commit	2013-05-29 11:59:26 +00:00
branch-range-07.py	[SystemZ] Use BRCT and BRCTG to eliminate add-&-compare sequences	2013-08-05 11:23:46 +00:00
branch-range-08.py	[SystemZ] Use BRCT and BRCTG to eliminate add-&-compare sequences	2013-08-05 11:23:46 +00:00
lit.local.cfg
spill-01.py	[SystemZ] Use MVC to spill loads and stores	2013-07-02 15:28:56 +00:00
spill-02.py	[SystemZ] Enable the use of MVC for frame-to-frame spills	2013-07-05 14:02:01 +00:00