forked from OSchip/llvm-project
7aa90f5735
These two intrinsics are defined in arm_acle.h. __rev16l needs to rotate by 16 bits, bit it was actually rotating by 2 bits. For AArch64, where long is 64 bits, this would still be wrong. __rev16ll was incorrect, it reversed the bytes in each 32-bit word, rather than each 16-bit halfword. The correct implementation is to apply __rev16 to the top and bottom words of the 64-bit value. For AArch32 targets, these get compiled down to the hardware rev16 instruction at -O1 and above. For AArch64 targets, the 64-bit ones get compiled to two 32-bit rev16 instructions, because there is not currently a pattern for the 64-bit rev16 instruction. Differential Revision: http://reviews.llvm.org/D14609 llvm-svn: 253211 |
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