Dan Gohman 30fc5bbfd1 Fix a bug which prevented tail merging of return instructions in ... beneficial cases. See the changes in test/CodeGen/X86/tail-opts.ll and test/CodeGen/ARM/ifcvt2.ll for details. The fix is to change HashEndOfMBB to hash at most one instruction, instead of trying to apply heuristics about when it will be profitable to consider more than one instruction. The regular tail-merging heuristics are already prepared to handle the same cases, and they're more precise. Also, make test/CodeGen/ARM/ifcvt5.ll and test/CodeGen/Thumb2/thumb2-branch.ll slightly more complex so that they continue to test what they're intended to test. And, this eliminates the problem in test/CodeGen/Thumb2/2009-10-15-ITBlockBranch.ll, the testcase from PR5204. Update it accordingly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102907 91177308-0d34-0410-b5e6-96231b3b80d8		2010-05-03 14:35:47 +00:00
..
Alpha
ARM	Fix a bug which prevented tail merging of return instructions in	2010-05-03 14:35:47 +00:00
Blackfin	Start function numbering at 0.	2010-04-17 16:29:15 +00:00
CBackend
CellSPU	teach cellspu how to return i8 and i16 from calls,	2010-04-20 05:36:09 +00:00
CPP
Generic	Remove the -enable-sjlj-eh option, which doesn't do anything.	2010-05-02 15:36:26 +00:00
MBlaze
Mips	Start function numbering at 0.	2010-04-17 16:29:15 +00:00
MSP430	Insert ANY_EXTEND node instead of invalid truncate during DAG Combining (X & 1),	2010-05-01 12:52:34 +00:00
PIC16
PowerPC	Remove the -enable-sjlj-eh option, which doesn't do anything.	2010-05-02 15:36:26 +00:00
SPARC
SystemZ
Thumb	Start function numbering at 0.	2010-04-17 16:29:15 +00:00
Thumb2	Fix a bug which prevented tail merging of return instructions in	2010-05-03 14:35:47 +00:00
X86	Fix a bug which prevented tail merging of return instructions in	2010-05-03 14:35:47 +00:00
XCore	Start function numbering at 0.	2010-04-17 16:29:15 +00:00