diff --git a/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp b/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
--- a/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
@@ -222,14 +222,17 @@
         return false;
       });
 
-  PB.registerPipelineStartEPCallback(
-      [this, DebugPassManager](ModulePassManager &PM,
-                               PassBuilder::OptimizationLevel Level) {
-        FunctionPassManager FPM(DebugPassManager);
-        FPM.addPass(NVVMReflectPass(Subtarget.getSmVersion()));
-        FPM.addPass(NVVMIntrRangePass(Subtarget.getSmVersion()));
-        PM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
-      });
+  // FIXME: these passes are causing numerical discrepancies, investigate and
+  // re-enable.
+
+  // PB.registerPipelineStartEPCallback(
+  //     [this, DebugPassManager](ModulePassManager &PM,
+  //                              PassBuilder::OptimizationLevel Level) {
+  //       FunctionPassManager FPM(DebugPassManager);
+  //       FPM.addPass(NVVMReflectPass(Subtarget.getSmVersion()));
+  //       FPM.addPass(NVVMIntrRangePass(Subtarget.getSmVersion()));
+  //       PM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
+  //     });
 }
 
 TargetTransformInfo
diff --git a/llvm/test/CodeGen/NVPTX/nvvm-reflect-arch.ll b/llvm/test/CodeGen/NVPTX/nvvm-reflect-arch.ll
--- a/llvm/test/CodeGen/NVPTX/nvvm-reflect-arch.ll
+++ b/llvm/test/CodeGen/NVPTX/nvvm-reflect-arch.ll
@@ -1,9 +1,10 @@
 ; Libdevice in recent CUDA versions relies on __CUDA_ARCH reflecting GPU type.
 ; Verify that __nvvm_reflect() is replaced with an appropriate value.
 ;
-; RUN: opt %s -S -nvvm-reflect -O2 -mtriple=nvptx64 \
+; FIXME: fix pass and re-enable under new PM
+; RUN: opt %s -S -nvvm-reflect -O2 -enable-new-pm=0 -mtriple=nvptx64 \
 ; RUN:   | FileCheck %s --check-prefixes=COMMON,SM20
-; RUN: opt %s -S -nvvm-reflect -O2 -mtriple=nvptx64 -mcpu=sm_35 \
+; RUN: opt %s -S -nvvm-reflect -O2 -enable-new-pm=0 -mtriple=nvptx64 -mcpu=sm_35 \
 ; RUN:   | FileCheck %s --check-prefixes=COMMON,SM35
 
 @"$str" = private addrspace(1) constant [12 x i8] c"__CUDA_ARCH\00"