[MLIR] Fix triple mismatch warning for embedded libdevice (llvm#121447)

IRLinker emits warning when linking two modules of different target
triples. The warning is disabled if the source module is libdevice. When
using libdevice embedded in LLVM library via MLIR_NVVM_EMBED_LIBDEVICE,
IRLinker can no longer tell whether the source module is libdevice via
module identifier.

Since `nvptx64-nvidia-gpulibs` is a magic triple that identifies the
libdevice module already, the libdevice filename check is redundant.
This patch fixes the triple mismatch warning by just removing the
filename check.

llvm/lib/Linker/IRMover.cpp

@@ -1562,10 +1562,6 @@ Error IRLinker::run() {
   bool EnableDLWarning = true;
   bool EnableTripleWarning = true;
   if (SrcTriple.isNVPTX() && DstTriple.isNVPTX()) {
-    std::string ModuleId = SrcM->getModuleIdentifier();
-    StringRef FileName = llvm::sys::path::filename(ModuleId);
-    bool SrcIsLibDevice =
-        FileName.starts_with("libdevice") && FileName.ends_with(".10.bc");
     bool SrcHasLibDeviceDL =
         (SrcM->getDataLayoutStr().empty() ||
          SrcM->getDataLayoutStr() == "e-i64:64-v16:16-v32:32-n16:32:64");
@@ -1576,8 +1572,8 @@ Error IRLinker::run() {
                                   SrcTriple.getOSName() == "gpulibs") ||
                                  (SrcTriple.getVendorName() == "unknown" &&
                                   SrcTriple.getOSName() == "unknown");
-    EnableTripleWarning = !(SrcIsLibDevice && SrcHasLibDeviceTriple);
-    EnableDLWarning = !(SrcIsLibDevice && SrcHasLibDeviceDL);
+    EnableTripleWarning = !SrcHasLibDeviceTriple;
+    EnableDLWarning = !(SrcHasLibDeviceTriple && SrcHasLibDeviceDL);
   }
 
   if (EnableDLWarning && (SrcM->getDataLayout() != DstM.getDataLayout())) {

llvm/test/Linker/Inputs/libdevice-with-wrong-dl.ll

@@ -0,0 +1,2 @@
+target triple = "nvptx64-nvidia-gpulibs"
+target datalayout = "e-i64:64-i128:128-v32:32-n16:32:64"

llvm/test/Linker/cuda-libdevice.ll

@@ -4,8 +4,8 @@
 ; RUN: llvm-as %p/Inputs/libdevice-cuda-9.ll -o %t/libdevice.compute_35.10.bc
 ; RUN: llvm-as %p/Inputs/libdevice-cuda-10.ll -o %t/libdevice.10.bc
 ; RUN: llvm-as %p/Inputs/libdevice-cuda-11.ll -o %t/libdevice.11.10.bc
-; RUN: llvm-as %p/Inputs/libdevice-cuda-9.ll -o %t/correct-libdevice-wrong-filename.bc
 ; RUN: llvm-as %p/Inputs/not-a-libdevice.ll -o %t/libdevice-with-wrong-info.bc
+; RUN: llvm-as %p/Inputs/libdevice-with-wrong-dl.ll -o %t/libdevice-with-wrong-dl.bc
 
 ; No warnings expected when we link with libdevice variants
 ; RUN: llvm-link %t/main.bc %t/libdevice.compute_35.10.bc -S 2>&1 \
@@ -15,12 +15,12 @@
 ; RUN: llvm-link %t/main.bc %t/libdevice.11.10.bc -S 2>&1 \
 ; RUN:  | FileCheck --check-prefixes COMMON,NOWARN %s
 
-; But make sure we still issue warnings if we see unexpected filename, or
-; unexpected triple or datalayout within a libdevice filename.
-; RUN: llvm-link %t/main.bc %t/correct-libdevice-wrong-filename.bc -S 2>&1 \
-; RUN:  | FileCheck --check-prefixes COMMON,WARN-TRIPLE %s
+; But make sure we still issue warnings if we see unexpected triple or
+; datalayout within a libdevice module.
 ; RUN: llvm-link %t/main.bc %t/libdevice-with-wrong-info.bc -S 2>&1 \
 ; RUN:  | FileCheck --check-prefixes COMMON,WARN-TRIPLE,WARN-DL %s
+; RUN: llvm-link %t/main.bc %t/libdevice-with-wrong-dl.bc -S 2>&1 \
+; RUN:  | FileCheck --check-prefixes COMMON,NOWARN,WARN-DL %s
 
 
 target triple = "nvptx64-nvidia-cuda"