V8 uses __builtin_assume_aligned to tell the compiler that the base address it uses for pointer compression is 4GB-aligned: https://source.chromium.org/chromi

V8 uses __builtin_assume_aligned to tell the compiler that the base address it uses for pointer compression is 4GB-aligned: https://source.chromium.org/chromium/chromium/src/+/main:v8/src/common/ptr-compr-inl.h;l=25 https://source.chromium.org/chromium/chromium/src/+/main:v8/...