Function sched_barrier

Prevent movement of some instruction types.

Controls the types of instructions that may be allowed to cross the intrinsic during instruction scheduling. The parameter is a mask for the instruction types that can cross the intrinsic.

• 0x0000: No instructions may be scheduled across sched_barrier.
• 0x0001: All, non-memory, non-side-effect producing instructions may be scheduled across sched_barrier, i.e. allow ALU instructions to pass.
• 0x0002: VALU instructions may be scheduled across sched_barrier.
• 0x0004: SALU instructions may be scheduled across sched_barrier.
• 0x0008: MFMA/WMMA instructions may be scheduled across sched_barrier.
• 0x0010: All VMEM instructions may be scheduled across sched_barrier.
• 0x0020: VMEM read instructions may be scheduled across sched_barrier.
• 0x0040: VMEM write instructions may be scheduled across sched_barrier.
• 0x0080: All DS instructions may be scheduled across sched_barrier.
• 0x0100: All DS read instructions may be scheduled across sched_barrier.
• 0x0200: All DS write instructions may be scheduled across sched_barrier.
• 0x0400: All Transcendental (e.g. V_EXP) instructions may be scheduled across sched_barrier.

This intrinsic does not behave like a normal function call; it is a "convergent" operation and as such has non-standard control-flow effects which need special treatment by the language. Rust currently does not properly support convergent operations. This operation is hence provided on a best-effort basis. Using it may result in incorrect code under some circumstances.