fix •bit._cast on large inputs
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@ -1003,8 +1003,9 @@ B bitcast_impl(B el0, B el1, B x) {
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CastType xt = getCastType(el0, x);
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CastType zt = getCastType(el1, bi_N);
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usz* sh = a(x)->sh;
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usz s=xt.s*sh[xr-1], zl=s/zt.s;
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u64 s=xt.s*(u64)sh[xr-1], zl=s/zt.s;
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if (zl*zt.s != s) thrM("•bit._cast: incompatible lengths");
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if (s>=USZ_MAX) thrM("•bit._cast: output too large");
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// Convert to input type
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B r = convert(xt, x);
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u8 rt = typeOfCast(zt);
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