================
@@ -873,6 +879,24 @@ AMDGPUTargetMachine::AMDGPUTargetMachine(const Target &T,
const Triple &TT,
TLOF(createTLOF(getTargetTriple())) {
initAsmInfo();
if (TT.isAMDGCN()) {
+ // Triple is missing a representation for non-empty, but unrecognized
+ // subarches. Only permit no subarch for any subtarget if it was really
+ // empty.
+ bool IsUnknownSubArch =
+ TT.getSubArch() == Triple::NoSubArch && TT.getArchName().size() != 6;
+ if (IsUnknownSubArch)
+ reportFatalUsageError("unknown subarch " + TT.getArchName());
+
+ if (TT.getSubArch() != Triple::NoSubArch) {
+ AMDGPU::GPUKind Kind = AMDGPU::parseArchAMDGCN(CPU);
+ Triple::SubArchType GPUSubArch = AMDGPU::getSubArch(Kind);
+ if (Kind != AMDGPU::GK_NONE && GPUSubArch != TT.getSubArch() &&
+ TT.getSubArch() != AMDGPU::getMajorSubArch(GPUSubArch)) {
----------------
ro-i wrote:
iiuc, this is not symmetric, in contrast to `isCPUValidForSubArch` /
`isSubArchCompatible`?
https://github.com/llvm/llvm-project/pull/206480
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