should be it

external/duckdb/third_party/tpce-tool/include/utilities/BigMath.h

@@ -0,0 +1,95 @@
+/*
+ * Legal Notice
+ *
+ * This document and associated source code (the "Work") is a part of a
+ * benchmark specification maintained by the TPC.
+ *
+ * The TPC reserves all right, title, and interest to the Work as provided
+ * under U.S. and international laws, including without limitation all patent
+ * and trademark rights therein.
+ *
+ * No Warranty
+ *
+ * 1.1 TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE INFORMATION
+ *     CONTAINED HEREIN IS PROVIDED "AS IS" AND WITH ALL FAULTS, AND THE
+ *     AUTHORS AND DEVELOPERS OF THE WORK HEREBY DISCLAIM ALL OTHER
+ *     WARRANTIES AND CONDITIONS, EITHER EXPRESS, IMPLIED OR STATUTORY,
+ *     INCLUDING, BUT NOT LIMITED TO, ANY (IF ANY) IMPLIED WARRANTIES,
+ *     DUTIES OR CONDITIONS OF MERCHANTABILITY, OF FITNESS FOR A PARTICULAR
+ *     PURPOSE, OF ACCURACY OR COMPLETENESS OF RESPONSES, OF RESULTS, OF
+ *     WORKMANLIKE EFFORT, OF LACK OF VIRUSES, AND OF LACK OF NEGLIGENCE.
+ *     ALSO, THERE IS NO WARRANTY OR CONDITION OF TITLE, QUIET ENJOYMENT,
+ *     QUIET POSSESSION, CORRESPONDENCE TO DESCRIPTION OR NON-INFRINGEMENT
+ *     WITH REGARD TO THE WORK.
+ * 1.2 IN NO EVENT WILL ANY AUTHOR OR DEVELOPER OF THE WORK BE LIABLE TO
+ *     ANY OTHER PARTY FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO THE
+ *     COST OF PROCURING SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS
+ *     OF USE, LOSS OF DATA, OR ANY INCIDENTAL, CONSEQUENTIAL, DIRECT,
+ *     INDIRECT, OR SPECIAL DAMAGES WHETHER UNDER CONTRACT, TORT, WARRANTY,
+ *     OR OTHERWISE, ARISING IN ANY WAY OUT OF THIS OR ANY OTHER AGREEMENT
+ *     RELATING TO THE WORK, WHETHER OR NOT SUCH AUTHOR OR DEVELOPER HAD
+ *     ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
+ *
+ * Contributors
+ * - Cecil Reames, Matt Emmerton
+ */
+
+#ifndef BIGMATH_H
+#define BIGMATH_H
+
+#include "EGenStandardTypes.h"
+
+namespace TPCE {
+
+// For 128-bit integer multiplication
+#define BIT63 UINT64_CONST(0x8000000000000000)
+#define CARRY32 UINT64_CONST(0x100000000)
+#define MASK32 UINT64_CONST(0xFFFFFFFF)
+#define UPPER32 32
+
+// Multiply 64-bit and 32-bit factors, followed by a right-shift of 64 bits
+// (retaining upper 64-bit quantity) This is implemented as two 64-bit
+// multiplications with summation of partial products.
+inline UINT Mul6432WithShiftRight64(UINT64 seed, UINT range) {
+	UINT64 SL = (seed & MASK32), // lower 32 bits of seed
+	    SU = (seed >> UPPER32),  // upper 32 bits of seed
+	    RL = range;              // range
+
+	UINT64 p0 = (SL * RL), // partial products
+	    p1 = (SU * RL), s;
+
+	s = p0;
+	s >>= UPPER32;
+	s += p1;
+	s >>= UPPER32;
+
+	return (UINT)s;
+}
+
+// Multiply two 64-bit factors, followed by a right-shift of 64 bits (retaining
+// upper 64-bit quantity) This is implemented as four 64-bit multiplications
+// with summation of partial products and carry.
+inline UINT64 Mul6464WithShiftRight64(UINT64 seed, UINT64 range) {
+	UINT64 SL = (seed & MASK32), // lower 32 bits of seed
+	    SU = (seed >> UPPER32),  // upper 32 bits of seed
+	    RL = (range & MASK32),   // lower 32 bits of range
+	    RU = (range >> UPPER32); // upper 32 bits of range
+
+	UINT64 p0 = (SL * RL), // partial products
+	    p1 = (SU * RL), p2 = (SL * RU), p3 = (SU * RU), p12_carry = 0, s;
+
+	s = p0;
+	s >>= UPPER32;
+	s += p1;
+	p12_carry = ((((p1 & BIT63) || (s & BIT63)) && (p2 & BIT63)) ? CARRY32 : 0);
+	s += p2;
+	s >>= UPPER32;
+	s += p12_carry;
+	s += p3;
+
+	return s;
+}
+
+} // namespace TPCE
+
+#endif // BIGMATH_H