[llvm-bugs] [Bug 28204] New: [mc][gfx7] VOP3b v_mad_i64_i32/u64_u32 -- Missing support for DST1.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28204

            Bug ID: 28204
           Summary: [mc][gfx7] VOP3b v_mad_i64_i32/u64_u32 -- Missing
                    support for DST1.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AMDGPU
          Assignee: artem.tamazov at amd.com
          Reporter: artem.tamazov at amd.com
                CC: llvm-bugs at lists.llvm.org, nikolay.haustov at amd.com
    Classification: Unclassified

Created attachment 16585
  --> https://llvm.org/bugs/attachment.cgi?id=16585&action=edit
02684.tests_tg_gfx7_asm_lit1_bug.06.08.min.v_mad_X64_X32.zip

In VOP3b encoding, these instructions use second destination for carry-out.

Most probably, the issue appears for other sub-targets as well, e.g. gfx8.

Tested with r273139 (git # 4a94acfea8bfd6eb6b5809dd40f03e1fa42e673a)

GFX7 lit tests attached.

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