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28 lines
713 B
28 lines
713 B
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#include <stdint.h>
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#include "platform.h"
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#include "primitives.h"
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struct uint256
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softfloat_mul128To256( uint64_t a64, uint64_t a0, uint64_t b64, uint64_t b0 )
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{
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struct uint128 p0, p64, p128;
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struct uint256 z;
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p0 = softfloat_mul64To128( a0, b0 );
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z.v0 = p0.v0;
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p64 = softfloat_mul64To128( a64, b0 );
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z.v64 = p64.v0 + p0.v64;
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z.v128 = p64.v64 + ( z.v64 < p64.v0 );
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p128 = softfloat_mul64To128( a64, b64 );
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z.v128 += p128.v0;
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z.v192 = p128.v64 + ( z.v128 < p128.v0 );
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p64 = softfloat_mul64To128( a0, b64 );
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z.v64 += p64.v0;
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p64.v64 += ( z.v64 < p64.v0 );
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z.v128 += p64.v64;
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z.v192 += ( z.v128 < p64.v64 );
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return z;
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}
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