llvm-project

b2ec416a - [ARM] Fix NaN behaviour for MVE compare intrinsics (#116371)

[ARM] Fix NaN behaviour for MVE compare intrinsics (#116371) The MVE intrinsics are defined as having the same behaviour as the instructions which they correspond to. In particular, the vcmpleq and vcmpltq intrinsics correspond to the VCMP instruction with the LE or LT condition. However, these instructions with these two conditions do not match the normal IEEE754 behaviour for NaNs, they return true if either operand is a NaN, instead of false. Therefore we need to generate `fcmp` IR instructions with the `ule` and `ult` conditions, instead of `ole` and `olt`. This differs from AdvSIMD, where only instructions with the EQ, GE and GT conditions are available, and the intrinsics for the others are defined by swapping the condition and operand order, so the results match the IEEE754 behaviour for NaNs.