722b8e0e5a
Previously we assumed all callable functions did not need any implicitly passed inputs, and added attributes to functions to indicate when they were necessary. Requiring attributes for correctness is pretty ugly, and it makes supporting indirect and external calls more complicated. This inverts the direction of the attributes, so an undecorated function is assumed to need all implicit imputs. This enables AMDGPUAttributor by default to mark when functions are proven to not need a given input. This strips the equivalent functionality from the legacy AMDGPUAnnotateKernelFeatures pass. However, AMDGPUAnnotateKernelFeatures is not fully removed at this point although it should be in the future. It is still necessary for the two hacky amdgpu-calls and amdgpu-stack-objects attributes, which would be better served by a trivial analysis on the IR during selection. Additionally, AMDGPUAnnotateKernelFeatures still redundantly handles the uniform-work-group-size attribute to be removed in a future commit. At this point when not using -amdgpu-fixed-function-abi, we are still modifying the ABI based on these newly negated attributes. In the future, this option will be removed and the locations for implicit inputs will always be fixed. We will then use the new attributes to avoid passing the values when unnecessary.
This directory contains tests for the MIR file format parser and printer. It was necessary to split the tests across different targets as no single target covers all features available in machine IR. Tests for codegen passes should NOT be here but in test/CodeGen/sometarget. As a rule of thumb this directory should only contain tests using 'llc -run-pass none'.