[llvm] 6009607 - DAG: Check if deoptimize call is available before emitting it (#170940)

[via llvm-commits]

Author: Matt Arsenault
Date: 2025-12-29T21:48:28Z
New Revision: 60096071242348cf9af2345100931e02b83bfee0

URL: https://github.com/llvm/llvm-project/commit/60096071242348cf9af2345100931e02b83bfee0
DIFF: https://github.com/llvm/llvm-project/commit/60096071242348cf9af2345100931e02b83bfee0.diff

LOG: DAG: Check if deoptimize call is available before emitting it (#170940)

Added: 
    

Modified: 
    llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
    llvm/test/CodeGen/AMDGPU/llvm.deoptimize.ll

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
index 5b8cd343557fa..d34f3211dc463 100644
--- a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
@@ -1307,9 +1307,17 @@ void SelectionDAGBuilder::visitGCRelocate(const GCRelocateInst &Relocate) {
 
 void SelectionDAGBuilder::LowerDeoptimizeCall(const CallInst *CI) {
   const auto &TLI = DAG.getTargetLoweringInfo();
-  SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(RTLIB::DEOPTIMIZE),
-                                         TLI.getPointerTy(DAG.getDataLayout()));
 
+  RTLIB::LibcallImpl DeoptImpl = TLI.getLibcallImpl(RTLIB::DEOPTIMIZE);
+  if (DeoptImpl == RTLIB::Unsupported) {
+    DAG.getContext()->emitError("no deoptimize libcall available");
+    return;
+  }
+
+  SDValue Callee =
+      DAG.getExternalSymbol(DeoptImpl, TLI.getPointerTy(DAG.getDataLayout()));
+
+  // FIXME: Should pass in the calling convention for the LibcallImpl.
   // We don't lower calls to __llvm_deoptimize as varargs, but as a regular
   // call.  We also do not lower the return value to any virtual register, and
   // change the immediately following return to a trap instruction.

diff  --git a/llvm/test/CodeGen/AMDGPU/llvm.deoptimize.ll b/llvm/test/CodeGen/AMDGPU/llvm.deoptimize.ll
index ef8c00bb3b4b0..53446b644445a 100644
--- a/llvm/test/CodeGen/AMDGPU/llvm.deoptimize.ll
+++ b/llvm/test/CodeGen/AMDGPU/llvm.deoptimize.ll
@@ -1,10 +1,6 @@
-; RUN: not llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 < %s 2> %t.err | FileCheck %s
-; RUN: FileCheck -check-prefix=ERR %s < %t.err
+; RUN: not llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 < %s 2>&1 | FileCheck %s
 
-; ERR: error: <unknown>:0:0: in function caller_0 i32 (): unsupported external symbol
-; ERR: error: unhandled statepoint-like instruction
-
-; CHECK: ;unsupported statepoint/stackmap/patchpoint
+; CHECK: error: no deoptimize libcall available
 declare i32 @llvm.experimental.deoptimize.i32(...)
 declare i8  @llvm.experimental.deoptimize.i8(...)