indirect-callThe loop body calls through a function pointer

Reported by --explain after a verdict.

mettle explain indirect-call

The callee is not known until the loop runs, so there is nothing to inline and no kernel to match.

Fix: where the pointer holds the same function for the whole loop, switch on it once outside and write a direct call in each arm. Each arm then vectorizes on its own.

Related

• call-in-bodyThe loop body calls a function
• extern-call-in-bodyThe loop body calls an external function
• alloc-in-bodyThe loop body allocates
• inline-asmThe loop body contains inline assembly
• control-flowThe loop body branches
• early-exitThe loop can leave before its trip count
• int16-elements16-bit integer elements have no kernel
• int64-elements64-bit integer elements have no kernel