[llvm-bugs] [Bug 34765] New: [mc][gfx9]

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Sep 28 08:01:49 PDT 2017


            Bug ID: 34765
           Summary: [mc][gfx9]
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AMDGPU
          Assignee: unassignedbugs at nondot.org
          Reporter: artem.tamazov at amd.com
                CC: andrey.kasaurov at gmail.com, artem.tamazov at amd.com,
                    llvm-bugs at lists.llvm.org, nikolay.haustov at amd.com,
                    sam.kolton at amd.com, valery.pykhtin at gmail.com

Gfx8 -> Gfx9:

Existing Gfx8 VALU instructions (ADD, ADDC, SUB, SUBREV, SUBB, SUBBREV) have
different mnemonics. The "_CO_" suffix added in order to explicitly express the
carry-out semantics. 

New VALU instructions added: ADD, SUB, SUBREV. These do not read and write
carry out.

Quiet change: Gfx8 sources which have ADD, SUB, SUBREV shall be updated for
Gfx9. Either second output operand shall be removed, or mnemonic shall be
changed to the one with "_CO_" suffix.

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