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[Backport v7.x] fix: selectively re-enable SIMD for ppc64 #5794

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Merged
mcollina merged 1 commit into from
Sep 13, 2026
Merged

[Backport v7.x] fix: selectively re-enable SIMD for ppc64 #5794

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10 changes: 8 additions & 2 deletions lib/dispatcher/client-h1.js
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Original file line number Diff line number Diff line change
Expand Up @@ -69,8 +69,14 @@ function lazyllhttp () {

let mod

// We disable wasm SIMD on ppc64 as it seems to be broken on Power 9 architectures.
let useWasmSIMD = process.arch !== 'ppc64'
// We disable wasm SIMD on older versions of Node.js on ppc64 that are broken on Power >=9 architectures.
let useWasmSIMD = true
if (process.arch === 'ppc64') {
const [major, minor] = process.versions.node.split('.').map(n => parseInt(n, 10))
if (major < 24 || (major === 24 && minor < 12)) {
useWasmSIMD = false
}
}
// The Env Variable UNDICI_NO_WASM_SIMD allows explicitly overriding the default behavior
if (process.env.UNDICI_NO_WASM_SIMD === '1') {
useWasmSIMD = false
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