onnxruntime

91593138 - Merged PR 5807585: Remove support for strided 64-bit emulation in DML's Cast kernel

Merged PR 5807585: Remove support for strided 64-bit emulation in DML's Cast kernel A model from one of our partners regressed with a failure to evaluate due to the addition of strided 64-bit emulation in the DML EP for the Cast operator. Specifically, the model uses a Cast from int32 to int64 to produce the input shape to a Reshape node. When supplied with a shape dimension of -1 (int32 0xffffffff), the strided emulation in Cast ends up producing an int64 result of 0x00000000ffffffff. This is then fed into the Reshape operator, where it produces an incorrect tensor shape and a failure during evaluation. Generally speaking we assume that using strided 64-bit emulation is safe if a node's inputs came from the DML EP itself. This isn't true in the general case for Cast, however - casting negative signed values can and will produce incorrect outputs with strided emulation. After this change, Cast nodes with 64-bit types will fall back to CPU unless running on a GPU that native supports 64-bit datatypes. Related work items: #31768166