1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/tail-calls/litmus0.js b/js/src/jit-test/tests/wasm/tail-calls/litmus0.js
new file mode 100644
index 0000000000..89e978c2e7
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/tail-calls/litmus0.js
@@ -0,0 +1,24 @@
+// |jit-test| skip-if: !wasmTailCallsEnabled()
+
+// Loop implemented using tail calls - the call passes as many arguments as
+// the function receives, of the same types.
+//
+// The variable ballast is intended to test that we handle various combinations
+// of stack and register arguments properly.
+
+for ( let ballast=1; ballast < TailCallBallast; ballast++ ) {
+    let vals = iota(ballast,1);
+    let ps = vals.map(_ => 'i32').join(' ')
+    let es = vals.map(i => `(local.get ${1+i})`).join(' ')
+    let sum = vals.reduceRight((p,c) => `(i32.add (local.get ${c+1}) ${p})`, `(i32.const 0)`)
+    let sumv = vals.reduce((p,c) => p+c);
+    let text = `
+(module
+  (func $loop (export "loop") (param $n i32) (param $q i32) (param ${ps}) (result i32)
+    (if (result i32) (i32.eqz (local.get $n))
+        (then (return (i32.add (local.get $q) ${sum})))
+        (else (return_call $loop (i32.sub (local.get $n) (i32.const 1)) (i32.add (local.get $q) (i32.const 1)) ${es})))))
+`;
+    let ins = wasmEvalText(text);
+    assertEq(ins.exports.loop(TailCallIterations, ...vals), TailCallIterations + sumv);
+}