48 lines
1.1 KiB
Plaintext
48 lines
1.1 KiB
Plaintext
#pragma clang diagnostic ignored "-Wmissing-prototypes"
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#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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// Implementation of the GLSL findLSB() function
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template<typename T>
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T findLSB(T x)
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{
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return select(ctz(x), T(-1), x == T(0));
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}
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// Implementation of the signed GLSL findMSB() function
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template<typename T>
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T findSMSB(T x)
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{
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T v = select(x, T(-1) - x, x < T(0));
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return select(clz(T(0)) - (clz(v) + T(1)), T(-1), v == T(0));
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}
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// Implementation of the unsigned GLSL findMSB() function
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template<typename T>
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T findUMSB(T x)
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{
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return select(clz(T(0)) - (clz(x) + T(1)), T(-1), x == T(0));
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}
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kernel void main0()
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{
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int signed_value = 0;
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uint unsigned_value = 0u;
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int s = extract_bits(signed_value, 5, 20);
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uint u = extract_bits(unsigned_value, 6, 21);
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s = insert_bits(s, 40, 5, 4);
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u = insert_bits(u, 60u, 5, 4);
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u = reverse_bits(u);
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s = reverse_bits(s);
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int v0 = popcount(u);
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int v1 = popcount(s);
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int v2 = findUMSB(u);
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int v3 = findSMSB(s);
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int v4 = findLSB(u);
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int v5 = findLSB(s);
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}
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