[llvm-bugs] [Bug 43359] New: [AMDGPU][MC] Relocatable expressions are not counted as literals

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https://bugs.llvm.org/show_bug.cgi?id=43359

            Bug ID: 43359
           Summary: [AMDGPU][MC] Relocatable expressions are not counted
                    as literals
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AMDGPU
          Assignee: unassignedbugs at nondot.org
          Reporter: dpreobrazhensky at luxoft.com
                CC: llvm-bugs at lists.llvm.org

Relocatable expressions may be used as operands; however they are not accounted
for when computing the total number of literals used by an instruction. 

Examples:

// All GPUs
  s_sub_u32 s0, 123, 123 // ok
  s_sub_u32 s0, 123, 456 // error
  s_sub_u32 s0, 123, x   // ok, but should trigger an error

// GFX10
  v_bfe_u32 v0, v1, 123, 123  // ok
  v_bfe_u32 v0, v1, 123, 456  // error
  v_bfe_u32 v0, v1, 123, x    // ok, but should trigger an error

// GFX9
  v_bfe_u32 v0, v2, v3, v4  // ok
  v_bfe_u32 v0, v2, v3, 123 // error
  v_bfe_u32 v0, v2, v3, x   // breaks assembler (should trigger an error)

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