diff --git a/tests/builder.nix b/tests/builder.nix
index 441a131391..7016042aaa 100644
--- a/tests/builder.nix
+++ b/tests/builder.nix
@@ -6,12 +6,7 @@
 , isFp
 , vLen
 
-  # ip-emu here is used for running the simulation to get event log for the specific test case.
-, ip-emu
-  # t1-script contains many decent default for running the emulator, I don't want to replicate those simulation argument here.
-, t1-script
-, runCommand
-, elaborateConfigJson
+, makeEmuResult
 }:
 
 # args from makeBuilder
@@ -68,16 +63,8 @@ let
 
     dontFixup = true;
 
-    passthru.emu-result = runCommand "get-event-log" { } ''
-      ${t1-script}/bin/t1-helper \
-        "ipemu" \
-        --emulator-path ${ip-emu}/bin/emulator \
-        --config ${elaborateConfigJson} \
-        --case ${caseDrv}/bin/${pname}.elf \
-        --no-console-logging \
-        --no-file-logging \
-        --out-dir $out
-    '';
+    passthru.emu-result = makeEmuResult caseDrv;
+
   } // overrides);
 in
 caseDrv
diff --git a/tests/default.nix b/tests/default.nix
index 795b14b877..5a8f3ee6e0 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -20,6 +20,8 @@ let
 
     inherit ip-emu;
 
+    makeEmuResult = casesSelf.callPackage ./make-emu-result.nix { };
+
     makeBuilder = casesSelf.callPackage ./builder.nix { };
 
     findAndBuild = dir: build:
diff --git a/tests/make-emu-result.nix b/tests/make-emu-result.nix
new file mode 100644
index 0000000000..f2f34f0b76
--- /dev/null
+++ b/tests/make-emu-result.nix
@@ -0,0 +1,20 @@
+# CallPackage args
+{ runCommand
+, t1-script
+, ip-emu
+, elaborateConfigJson
+}:
+
+# makeEmuResult arg
+testCase:
+
+runCommand "get-emu-result" { } ''
+  ${t1-script}/bin/t1-helper \
+    "ipemu" \
+    --emulator-path ${ip-emu}/bin/emulator \
+    --config ${elaborateConfigJson} \
+    --case ${testCase}/bin/${testCase.pname}.elf \
+    --no-console-logging \
+    --no-file-logging \
+    --out-dir $out
+''
diff --git a/tests/rvv_bench/default.nix b/tests/rvv_bench/default.nix
index e5376b838c..3d4b867754 100644
--- a/tests/rvv_bench/default.nix
+++ b/tests/rvv_bench/default.nix
@@ -3,30 +3,37 @@
 , makeBuilder
 , findAndBuild
 , t1main
+, makeEmuResult
 }:
 
 let
   include = ./_include;
   builder = makeBuilder { casePrefix = "rvv_bench"; };
   build = { caseName, sourcePath }:
-    builder {
-      inherit caseName;
+    let
+      drv = builder
+        {
+          inherit caseName;
 
-      src = sourcePath;
+          src = sourcePath;
 
-      isFp = lib.pathExists (lib.path.append sourcePath "isFp");
+          isFp = lib.pathExists (lib.path.append sourcePath "isFp");
 
-      buildPhase = ''
-        runHook preBuild
+          buildPhase = ''
+            runHook preBuild
 
-        $CC -E -DINC=$PWD/${caseName}.S -E ${include}/template.S -o functions.S
-        $CC -I${include} ${caseName}.c -T${linkerScript} ${t1main} functions.S -o $pname.elf
+            $CC -E -DINC=$PWD/${caseName}.S -E ${include}/template.S -o functions.S
+            $CC -I${include} ${caseName}.c -T${linkerScript} ${t1main} functions.S -o $pname.elf
 
-        runHook postBuild
-      '';
+            runHook postBuild
+          '';
 
-      meta.description = "test case '${caseName}', written in C intrinsic";
-    };
+          meta.description = "test case '${caseName}', written in C intrinsic";
+
+          passthru.emu-result = makeEmuResult drv;
+        };
+    in
+    drv;
 in
-  findAndBuild ./. build
+findAndBuild ./. build