Index: test/tools/llvm-cov/Inputs/path_equivalence.proftext
===================================================================
--- test/tools/llvm-cov/Inputs/path_equivalence.proftext
+++ test/tools/llvm-cov/Inputs/path_equivalence.proftext
@@ -0,0 +1,8 @@
+main
+# Func Hash:
+0
+# Num Counters:
+1
+# Counter Values:
+1
+
Index: test/tools/llvm-cov/path_equivalence.c
===================================================================
--- test/tools/llvm-cov/path_equivalence.c
+++ test/tools/llvm-cov/path_equivalence.c
@@ -0,0 +1,7 @@
+// RUN: llvm-profdata merge %S/Inputs/path_equivalence.proftext -o %t.profdata
+// RUN: llvm-cov show %S/Inputs/path_equivalence.covmapping -instr-profile=%t.profdata -path-equivalence=/tmp,%S | FileCheck %s
+
+int main() {} // CHECK: [[@LINE]]|      1|int main() {}
+
+// RUN: llvm-cov show %S/Inputs/path_equivalence.covmapping -instr-profile=%t.profdata -path-equivalence=/tmp,%S --filename-equivalence %s | FileCheck --check-prefix IGNORED_REMAP %s
+// IGNORED_REMAP: warning: path-equivalence was ignored as source files were given
Index: tools/llvm-cov/CodeCoverage.cpp
===================================================================
--- tools/llvm-cov/CodeCoverage.cpp
+++ tools/llvm-cov/CodeCoverage.cpp
@@ -132,6 +132,10 @@
   /// coverage mapping data to input source files.
   StringMap<std::string> RemappedFilenames;
 
+  /// The coverage data path to be remapped from, and the source path to be
+  /// remapped to, when using -path-equivalence.
+  std::pair<std::string, std::string> PathRemapping;
+
   /// The architecture the coverage mapping data targets.
   std::string CoverageArch;
 
@@ -518,6 +522,11 @@
       cl::desc("Treat source files as equivalent to paths in the coverage data "
                "when the file names match, even if the full paths do not"));
 
+  cl::opt<std::string> PathRemap(
+      "path-equivalence", cl::Optional,
+      cl::desc("<from>,<to> Map coverage data paths to local source file "
+               "paths"));
+
   cl::OptionCategory FilteringCategory("Function filtering options");
 
   cl::list<std::string> NameFilters(
@@ -590,6 +599,22 @@
       break;
     }
 
+    // If path-equivalence was given, normalise the paths for comparison.
+    PathRemapping = StringRef(PathRemap).split(',');
+    if (!(PathRemapping.first.empty() || PathRemapping.second.empty())) {
+      // Convert to native paths with trailing seperators
+      auto nativeWithTrailing = [](StringRef path) -> std::string {
+        SmallString<128> NativePath;
+        sys::path::native(path, NativePath);
+        if (!sys::path::is_separator(NativePath.back()))
+          NativePath += sys::path::get_separator();
+        return NativePath.c_str();
+      };
+      PathRemapping.first = nativeWithTrailing(PathRemapping.first);
+      PathRemapping.second = nativeWithTrailing(PathRemapping.second);
+    } else
+      PathRemapping = std::make_pair("", "");
+
     // If a demangler is supplied, check if it exists and register it.
     if (DemanglerOpts.size()) {
       auto DemanglerPathOrErr = sys::findProgramByName(DemanglerOpts[0]);
@@ -784,11 +809,27 @@
       (SourceFiles.size() != 1) || ViewOpts.hasOutputDirectory() ||
       (ViewOpts.Format == CoverageViewOptions::OutputFormat::HTML);
 
-  if (SourceFiles.empty())
+  if (SourceFiles.empty()) {
     // Get the source files from the function coverage mapping.
-    for (StringRef Filename : Coverage->getUniqueSourceFiles())
+    for (StringRef Filename : Coverage->getUniqueSourceFiles()) {
       SourceFiles.push_back(Filename);
 
+      // Remap by leading path
+      if (!PathRemapping.first.empty()) {
+        SmallString<128> NativeFilename;
+        sys::path::native(Filename, NativeFilename);
+        if (NativeFilename.startswith(PathRemapping.first)) {
+          RemappedFilenames[Filename] =
+              PathRemapping.second +
+              NativeFilename.substr(PathRemapping.first.size()).str();
+        }
+      }
+    }
+  } else if (!PathRemapping.first.empty()) {
+    ViewOpts.colored_ostream(errs(), raw_ostream::RED)
+        << "path-equivalence was ignored as source files were given";
+  }
+
   // Create an index out of the source files.
   if (ViewOpts.hasOutputDirectory()) {
     if (Error E = Printer->createIndexFile(SourceFiles, *Coverage)) {