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Author SHA1 Message Date
Juergen Ributzka c110c0b99a Recommit r218010 [FastISel][AArch64] Fold bit test and branch into TBZ and TBNZ. 
Note: This version fixed an issue with the TBZ/TBNZ instructions that were
generated in FastISel. The issue was that the 64bit version of TBZ (TBZX)
automagically sets the upper bit of the immediate field that is used to specify
the bit we want to test. To test for any of the lower 32bits we have to first
extract the subregister and use the 32bit version of the TBZ instruction (TBZW).

Original commit message:
Teach selectBranch to fold bit test and branch into a single instruction (TBZ or
TBNZ).

llvm-svn: 218693
 2014-09-30 19:59:35 +00:00
Juergen Ributzka 1d3a312e2d Revert "[FastISel][AArch64] Fold bit test and branch into TBZ and TBNZ." 
Reverting it until I have time to investigate a regression.

llvm-svn: 218035
 2014-09-18 08:07:40 +00:00
Juergen Ributzka c35fb03661 [FastISel][AArch64] Fold bit test and branch into TBZ and TBNZ. 
Teach selectBranch to fold bit test and branch into a single instruction (TBZ or
TBNZ).

llvm-svn: 218010
 2014-09-18 02:44:13 +00:00