AMDGPU: Create a dummy call sequence when emitting call error (#170656)

arsenm · web-flow · commit 5c659c917a77 · 2025-12-04T17:37:57.000Z
At least one special case call lowering tries to parse the call
sequence and asserts when it can't find a callseq_end.
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp b/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
@@ -1412,7 +1412,12 @@ SDValue AMDGPUTargetLowering::lowerUnhandledCall(CallLoweringInfo &CLI,
       InVals.push_back(DAG.getPOISON(Arg.VT));
   }
 
-  return CLI.Chain;
+  // FIXME: Hack because R600 doesn't handle callseq pseudos yet.
+  if (getTargetMachine().getTargetTriple().getArch() == Triple::r600)
+    return CLI.Chain;
+
+  SDValue Chain = DAG.getCALLSEQ_START(CLI.Chain, 0, 0, CLI.DL);
+  return DAG.getCALLSEQ_END(Chain, 0, 0, /*InGlue=*/SDValue(), CLI.DL);
 }
 
 SDValue AMDGPUTargetLowering::LowerCall(CallLoweringInfo &CLI,

Original file line number	Diff line number	Diff line change
`@@ -1412,7 +1412,12 @@ SDValue AMDGPUTargetLowering::lowerUnhandledCall(CallLoweringInfo &CLI,`
`1412`	`1412`	`InVals.push_back(DAG.getPOISON(Arg.VT));`
`1413`	`1413`	`}`
`1414`	`1414`
`1415`		`- return CLI.Chain;`
	`1415`	`+ // FIXME: Hack because R600 doesn't handle callseq pseudos yet.`
	`1416`	`+ if (getTargetMachine().getTargetTriple().getArch() == Triple::r600)`
	`1417`	`+ return CLI.Chain;`
	`1418`	`+`
	`1419`	`+ SDValue Chain = DAG.getCALLSEQ_START(CLI.Chain, 0, 0, CLI.DL);`
	`1420`	`+ return DAG.getCALLSEQ_END(Chain, 0, 0, /InGlue=/SDValue(), CLI.DL);`
`1416`	`1421`	`}`
`1417`	`1422`
`1418`	`1423`	`SDValue AMDGPUTargetLowering::LowerCall(CallLoweringInfo &CLI,`