Correct AMDGPU strictfp tests to follow the rules documented in the LangRef:
https://llvm.org/docs/LangRef.html#constrained-floating-point-intrinsics
Mostly these tests just needed the strictfp attribute on function
definitions. I've also removed the strictfp attribute from uses
of the constrained intrinsics because it comes by default since
D154991, but I only did this in tests I was changing anyway.
I also removed attributes added to declare lines of intrinsics. The
attributes of intrinsics cannot be changed in a test so I eliminated
attempts to do so.
Test changes verified with D146845.
SIInsertWaitcnts inserts waitcnt instructions to resolve data
dependencies. The GFX10+ vscnt (VMEM store count) counter is never used
in this way. It is only used to resolve memory dependencies, and that is
handled by SIMemoryLegalizer. Hence there is no need to conservatively
wait for vscnt to be 0 on function entry and before returns.
Differential Revision: https://reviews.llvm.org/D153537
class support and introduce GlobalISel implementation for AMDGPU
Uses existing SelectionDAG lowering of the llvm.amdgcn.class intrinsic
for llvm.is.fpclass
