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[AMDGPU][MC][GFX11] Some VOP3.DPP8 opcodes cannot be decoded #56163

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dpreobra opened this issue Jun 22, 2022 · 3 comments
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[AMDGPU][MC][GFX11] Some VOP3.DPP8 opcodes cannot be decoded #56163

dpreobra opened this issue Jun 22, 2022 · 3 comments
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backend:AMDGPU bug Indicates an unexpected problem or unintended behavior mc Machine (object) code

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An example of failed test:

0x00,0x00,0xc2,0xd4,0xe9,0x04,0x02,0x00,0x01,0x77,0x39,0x05

Expected output:

v_cmpx_eq_i32_e64_dpp v1, v2 dpp8:[7,6,5,4,3,2,1,0]

Actual result:

v_dot2acc_f32_f16 v156, v1, v187 ; encoding: [0x01,0x77,0x39,0x05]

See also bug #56065. The root cause is the same.
A fix is pending.
@dpreobra dpreobra added bug Indicates an unexpected problem or unintended behavior backend:AMDGPU mc Machine (object) code labels Jun 22, 2022
@dpreobra dpreobra self-assigned this Jun 22, 2022
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llvmbot commented Jun 22, 2022

@llvm/issue-subscribers-bug

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llvmbot commented Jun 22, 2022

@llvm/issue-subscribers-backend-amdgpu

dpreobra added a commit that referenced this issue Jun 23, 2022
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[AMDGPU][MC][GFX11] Correct disassembly of VOP3.DPP8 opcodes
dcb24f9 
Fix bug #56163.
Add W32/W64 tests for all VOP3.DPP opcodes.

Differential Revision: https://reviews.llvm.org/D128369
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Fixed by commit dcb24f9.

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backend:AMDGPU bug Indicates an unexpected problem or unintended behavior mc Machine (object) code
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