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diff --git a/js/src/jit-test/lib/codegen-x86-test.js b/js/src/jit-test/lib/codegen-x86-test.js
new file mode 100644
index 0000000000..b41749e0af
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+++ b/js/src/jit-test/lib/codegen-x86-test.js
@@ -0,0 +1,65 @@
+// Scaffolding for testing x86 Ion code generation patterns .  See
+// codegen-x64-test.js in this directory for more information.
+
+load(libdir + "codegen-test-common.js");
+
+// Note that Zydis disassembles x86 absolute addresses as relative, so
+// the binary encoding and the text encoding may not correspond precisely.
+
+// Absolute address (disp32) following the instruction mnemonic.
+var ABS = `0x${HEXES}`;
+
+// Absolute address (disp32) in the binary encoding.
+var ABSADDR = `${HEX}{2} ${HEX}{2} ${HEX}{2} ${HEX}{2}`;
+
+// End of prologue.  The mov to eax is debug code, inserted by the register
+// allocator to clobber eax before a move group.  But it is only present if
+// there is a move group there.
+var x86_prefix = `
+8b ec            mov %esp, %ebp(
+b8 ef be ad de   mov \\$0xDEADBEEF, %eax)?
+`
+
+// `.bp` because zydis chooses 'rbp' even on 32-bit systems
+var x86_loadarg0 = `
+f3 0f 6f 45 ${HEX}{2}            movdqux 0x${HEXES}\\(%.bp\\), %xmm0
+`;
+
+// Start of epilogue.  `.bp` for the same reason as above.
+var x86_suffix = `5d      pop %.bp`;
+
+// v128 OP literal -> v128
+// inputs: [[complete-opname, rhs-literal, expected-pattern], ...]
+function codegenTestX86_v128xLITERAL_v128(inputs, options = {}) {
+    for ( let [op, literal, expected] of inputs ) {
+        codegenTestX86_adhoc(wrap(options, `
+    (func (export "f") (param v128) (result v128)
+      (${op} (local.get 0) ${literal}))`),
+                             'f',
+                             x86_loadarg0 + expected,
+                             options)
+    }
+}
+
+// For when nothing else applies: `module_text` is the complete source text of
+// the module, `export_name` is the name of the function to be tested,
+// `expected` is the non-preprocessed pattern, and options is an options bag,
+// described above.
+function codegenTestX86_adhoc(module_text, export_name, expected, options = {}) {
+    assertEq(hasDisassembler(), true);
+
+    let ins = wasmEvalText(module_text);
+    let output = wasmDis(ins.exports[export_name], {tier:"ion", asString:true});
+    if (!options.no_prefix)
+        expected = x86_prefix + '\n' + expected;
+    if (!options.no_suffix)
+        expected = expected + '\n' + x86_suffix;
+    expected = fixlines(expected);
+    if (options.log) {
+        print(module_text);
+        print(output);
+        print(expected);
+    }
+    assertEq(output.match(new RegExp(expected)) != null, true);
+}
+