[llvm-bugs] [Bug 34654] New: Illegal instructions since [AMDGPU] Produce madak and madmk from the two-address pass

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34654

            Bug ID: 34654
           Summary: Illegal instructions since  [AMDGPU] Produce madak and
                    madmk from the two-address pass
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AMDGPU
          Assignee: unassignedbugs at nondot.org
          Reporter: adf.lists at gmail.com
                CC: llvm-bugs at lists.llvm.org

R9 285 Tonga.

Updated llvm and on head I get an assert with most gl usage.

valley_x64: /mnt/sdb1/Gits/llvm/include/llvm/CodeGen/MachineOperand.h:278:
unsigned int llvm::MachineOperand::getReg() const: Assertion `isReg() && "This
is not a register operand!"' failed.

Going back to find a good, testing with Unigine Valley I got floods of

LLVM triggered Diagnostic Handler: Illegal instruction detected: VOP*
instruction uses the constant bus more than once
%VGPR20<def> = V_MADAK_F32 %SGPR5, %VGPR22, -1194215657, %EXEC<imp-use>

Bisecting the illegal instruction issue came up with -

commit 46582be9742d931368f9455a768df95d9525ccf5
Author: Stanislav Mekhanoshin <Stanislav.Mekhanoshin at amd.com>
Date:   Mon Sep 11 17:13:57 2017 +0000

    [AMDGPU] Produce madak and madmk from the two-address pass

    These two instructions are normally selected, but when the
    two address pass converts mac into mad we end up with the
    mad where we could have one of these.

    Differential Revision: https://reviews.llvm.org/D37389

    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312928
91177308-0d34-0410-b5e6-96231b3b80d8

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