Update lib/dispatcher/client-h1.js

Co-authored-by: Aras Abbasi <[email protected]>

Author: mcollina

lib/dispatcher/client-h1.js

@@ -65,8 +65,17 @@ function lazyllhttp () {
 
   let mod
 
-  // We are disabling wasm SIMD on ppc64 as it seems to be broken on Power 9 architectures.
-  if (process.env.UNDICI_NO_WASM_SIMD !== '1' || process.arch !== 'ppc64') {
+  // We disable wasm SIMD on ppc64 as it seems to be broken on Power 9 architectures.
+  let useWasmSIMD = process.arch !== 'ppc64'
+  
+  // The Env Variable UNDICI_NO_WASM_SIMD allows explicitly overriding the default behavior
+  if (process.env.UNDICI_NO_WASM_SIMD === '1') {
+    useWasmSIMD = true
+  } else if  (process.env.UNDICI_NO_WASM_SIMD === '0') {
+    useWasmSIMD = false
+  }
+
+  if (useSIMD) {
     try {
       mod = new WebAssembly.Module(require('../llhttp/llhttp_simd-wasm.js'))
       /* istanbul ignore next */