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4 Commits

Author SHA1 Message Date
Juergen Ributzka
76c57b0570 [FastISel][AArch64] Optimize compare-and-branch for i1 to use 'tbz'. 
Minor enhancement to use 'tbz' for i1 compare-and-branch to get rid of an 'and'
instruction.

This fixes rdar://problem/18784953.

llvm-svn: 220712
 2014-10-27 19:46:23 +00:00
Juergen Ributzka
3423c5ccda [FastISel][AArch64] Use 'cbz' also for null values (pointers). 
The pattern matching for a 'ConstantInt' value was too restrictive. Checking for
a 'Constant' with a bull value is sufficient for using an 'cbz/cbnz' instruction.

This fixes rdar://problem/18784732.

llvm-svn: 220709
 2014-10-27 19:38:05 +00:00
Oliver Stannard
4116b199b2 [AArch64] Fix fast-isel of cbz of i1, i8, i16 
This fixes a miscompilation in the AArch64 fast-isel which was
triggered when a branch is based on an icmp with condition eq or ne,
and type i1, i8 or i16. The cbz instruction compares the whole 32-bit
register, so values with the bottom 1, 8 or 16 bits clear would cause
the wrong branch to be taken.

llvm-svn: 220553
 2014-10-24 09:54:41 +00:00
Juergen Ributzka
27d8a0df16 [FastISel][AArch64] Fold compare with zero and branch into CBZ and CBNZ. 
This takes advanatage of the CBZ and CBNZ instruction to further optimize the
common null check pattern into a single instruction.

This is related to rdar://problem/18358882.

llvm-svn: 217972
 2014-09-17 18:05:34 +00:00