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-rw-r--r--src/lib/netlist/plib/pfunction.cpp104
1 files changed, 104 insertions, 0 deletions
diff --git a/src/lib/netlist/plib/pfunction.cpp b/src/lib/netlist/plib/pfunction.cpp
new file mode 100644
index 00000000000..c0f3e18a4f2
--- /dev/null
+++ b/src/lib/netlist/plib/pfunction.cpp
@@ -0,0 +1,104 @@
+// license:GPL-2.0+
+// copyright-holders:Couriersud
+/*
+ * palloc.c
+ *
+ */
+
+#include <cmath>
+#include "pfunction.h"
+#include "pfmtlog.h"
+#include "putil.h"
+#include "pexception.h"
+
+namespace plib {
+
+void pfunction::compile_postfix(const std::vector<pstring> &inputs, const pstring expr)
+{
+ plib::pstring_vector_t cmds(expr, " ");
+ m_precompiled.clear();
+ int stk = 0;
+
+ for (pstring &cmd : cmds)
+ {
+ rpn_inst rc;
+ if (cmd == "+")
+ { rc.m_cmd = ADD; stk -= 1; }
+ else if (cmd == "-")
+ { rc.m_cmd = SUB; stk -= 1; }
+ else if (cmd == "*")
+ { rc.m_cmd = MULT; stk -= 1; }
+ else if (cmd == "/")
+ { rc.m_cmd = DIV; stk -= 1; }
+ else if (cmd == "pow")
+ { rc.m_cmd = POW; stk -= 1; }
+ else if (cmd == "sin")
+ { rc.m_cmd = SIN; stk -= 0; }
+ else if (cmd == "cos")
+ { rc.m_cmd = COS; stk -= 0; }
+ else
+ {
+ for (unsigned i = 0; i < inputs.size(); i++)
+ {
+ if (inputs[i] == cmd)
+ {
+ rc.m_cmd = PUSH_INPUT;
+ rc.m_param = i;
+ stk += 1;
+ break;
+ }
+ }
+ if (rc.m_cmd != PUSH_INPUT)
+ {
+ bool err = false;
+ rc.m_cmd = PUSH_CONST;
+ rc.m_param = cmd.as_double(&err);
+ if (err)
+ throw plib::pexception(plib::pfmt("nld_function: unknown/misformatted token <{1}> in <{2}>")(cmd)(expr));
+ stk += 1;
+ }
+ }
+ if (stk < 1)
+ throw plib::pexception(plib::pfmt("nld_function: stack underflow on token <{1}> in <{2}>")(cmd)(expr));
+ m_precompiled.push_back(rc);
+ }
+ if (stk != 1)
+ throw plib::pexception(plib::pfmt("nld_function: stack count different to one on <{2}>")(expr));
+}
+
+#define ST1 stack[ptr]
+#define ST2 stack[ptr-1]
+
+#define OP(OP, ADJ, EXPR) \
+case OP: \
+ ptr-=ADJ; \
+ stack[ptr-1] = EXPR; \
+ break;
+
+double pfunction::evaluate(const std::vector<double> &values)
+{
+ double stack[20];
+ unsigned ptr = 0;
+ for (auto &rc : m_precompiled)
+ {
+ switch (rc.m_cmd)
+ {
+ OP(ADD, 1, ST2 + ST1)
+ OP(MULT, 1, ST2 * ST1)
+ OP(SUB, 1, ST2 - ST1)
+ OP(DIV, 1, ST2 / ST1)
+ OP(POW, 1, std::pow(ST2, ST1))
+ OP(SIN, 0, std::sin(ST2));
+ OP(COS, 0, std::cos(ST2));
+ case PUSH_INPUT:
+ stack[ptr++] = values[static_cast<unsigned>(rc.m_param)];
+ break;
+ case PUSH_CONST:
+ stack[ptr++] = rc.m_param;
+ break;
+ }
+ }
+ return stack[ptr-1];
+}
+
+}