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I was wondering, is Google Chrome’s V8 engine translating JavaScript to use x86-64 specific instructions, such as the 64-bit SIMD instructions? (Even through the process is running in 32-bit mode)
SIMD instructions aren’t exclusive to x86-64, x86-64 just includes SSE & SSE2 as a standard.
if you look at the v8 source, you’ll notice they have an JIT assembler specifically for x64. you could also gleam from the source what SIMD instructions are used.