llvm-project

0f261db7 - [AMDGPU][MC] Avoid creating lit64() operands unless asked or needed.

[AMDGPU][MC] Avoid creating lit64() operands unless asked or needed. There should normally be no need to generate implicit lit64() modifiers on the assembler side. It's the encoder's responsibility to recognise literals that are implicitly 64 bits wide. The exceptions are where we rewrite floating-point operand values as integer ones, which would not be assembled back to the original values unless wrapped into lit64(). Respect explicit lit() modifiers for non-inline values as necessary to avoid regressions in MC tests. This change still doesn't prevent use of inline constants where lit()/lit64 is specified; subject to a separate patch. On disassembling, only create lit64() operands where necessary for correct round-tripping. Add round-tripping tests where useful and feasible.