llvm-project

Commit Graph

Author	SHA1	Message	Date
Oliver Stannard	f7a5afc3f2	[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	d8e30c0db8	[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

Author

SHA1

Message

Date

Oliver Stannard

f7a5afc3f2

[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

d8e30c0db8

[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

2 Commits