1 files changed, 66 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/tail-calls/litmus11.js b/js/src/jit-test/tests/wasm/tail-calls/litmus11.js
new file mode 100644
index 0000000000..78c7cd4c49
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/tail-calls/litmus11.js
@@ -0,0 +1,66 @@
+// |jit-test| skip-if: !wasmTailCallsEnabled()
+
+// Once we exhaust the register arguments this will alternately grow and then
+// shrink the stack frame across tail call boundaries because the increment of
+// stack allocation is 16 bytes and our variability exceeds that.
+//
+// (This is not redundant with eg litmus0, because in that case all the
+// functions have the same ballast.  Here we have different ballast, so we get growing and
+// shrinking.)
+//
+// See litmus13 for the same-module call_indirect case.
+// See litmus16 for the cross-module call_indirect case.
+
+function ntimes(n, v) {
+    if (typeof v == "function")
+        return iota(n).map(v).join(' ');
+    return iota(n).map(_ => v).join(' ');
+}
+
+function get_local(n) {
+    return `(local.get ${n})`
+}
+
+function compute(ballast) {
+    return iota(ballast).reduce((p,g,n) => `(i32.or ${p} (local.get ${n}))`,
+                                `(i32.const ${1 << ballast})`)
+}
+
+function build(n, ballast) {
+    switch (n) {
+    case 0:
+        return `
+(func $f0 (export "f") (result i32)
+  (return_call $f1 (i32.const ${1 << n})))
+`;
+    case ballast:
+        return `
+(func $f${ballast} (param ${ntimes(ballast, 'i32')}) (result i32)
+    (if (result i32) (i32.eqz (global.get $glob))
+        (then (return ${compute(ballast)}))
+        (else (block (result i32)
+          (global.set $glob (i32.sub (global.get $glob) (i32.const 1)))
+          (return_call $f0)))))
+`;
+    default:
+        return `
+(func $f${n} (param ${ntimes(n, 'i32')}) (result i32)
+  (return_call $f${n+1} (i32.const ${1 << n}) ${ntimes(n, get_local)}))
+`
+    }
+}
+
+for ( let ballast=1; ballast < TailCallBallast; ballast++ ) {
+
+    let vals = iota(ballast+1).map(v => 1 << v);
+    let sumv = vals.reduce((p,c) => p|c);
+    let text = `
+(module
+  (global $glob (mut i32) (i32.const ${TailCallIterations}))
+  ${ntimes(ballast, n => build(n, ballast))}
+  ${build(ballast, ballast)})
+`;
+
+    let ins = wasmEvalText(text);
+    assertEq(ins.exports.f(), sumv);
+}