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[AMDGPU][MC] Disassembler warning for v_cmpx instructions #127925

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Merged
merged 3 commits into from
Feb 27, 2025
Merged

[AMDGPU][MC] Disassembler warning for v_cmpx instructions #127925

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897cc8f
[AMDGPU][MC] Disassembler warning for v_cmpx instructions
jwanggit86 Feb 20, 2025
76e4eb6
(1) Removed target generation check (2) Added comment.
jwanggit86 Feb 22, 2025
f7988dc
Tests for gfx11 and gfx12.
jwanggit86 Feb 26, 2025
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14 changes: 13 additions & 1 deletion llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -663,6 +663,8 @@ DecodeStatus AMDGPUDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
return MCDisassembler::Fail;
} while (false);

DecodeStatus Status = MCDisassembler::Success;

if (MCII->get(MI.getOpcode()).TSFlags & SIInstrFlags::DPP) {
if (isMacDPP(MI))
convertMacDPPInst(MI);
Expand Down Expand Up @@ -801,8 +803,18 @@ DecodeStatus AMDGPUDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
if (ImmLitIdx != -1 && !IsSOPK)
convertFMAanyK(MI, ImmLitIdx);

// Some VOPC instructions, e.g., v_cmpx_f_f64, use VOP3 encoding and
// have EXEC as implicit destination. Issue a warning if encoding for
// vdst is not EXEC.
if ((MCII->get(MI.getOpcode()).TSFlags & SIInstrFlags::VOP3) &&
MCII->get(MI.getOpcode()).hasImplicitDefOfPhysReg(AMDGPU::EXEC)) {
auto ExecEncoding = MRI.getEncodingValue(AMDGPU::EXEC_LO);
if (Bytes_[0] != ExecEncoding)
Status = MCDisassembler::SoftFail;
}

Size = MaxInstBytesNum - Bytes.size();
return MCDisassembler::Success;
return Status;
}

void AMDGPUDisassembler::convertEXPInst(MCInst &MI) const {
Expand Down
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