From b0930584ad6c1f8590c306bc8d92f923b4da8f2c Mon Sep 17 00:00:00 2001
From: arphaman <arphaman@gmail.com>
Date: Wed, 4 Sep 2013 12:47:44 +0100
Subject: added integer power functions

---
 CMakeLists.txt               | 10 ++++++++++
 include/Numerical/Integer.h  | 21 +++++++++++++++++++++
 lib/Numerical/CMakeLists.txt |  3 ++-
 lib/Numerical/Integer.cpp    | 29 +++++++++++++++++++++++++++++
 test/CMakeLists.txt          |  1 +
 test/Unit/CMakeLists.txt     |  1 +
 test/Unit/ipow.cpp           | 38 ++++++++++++++++++++++++++++++++++++++
 7 files changed, 102 insertions(+), 1 deletion(-)
 create mode 100644 include/Numerical/Integer.h
 create mode 100644 lib/Numerical/Integer.cpp
 create mode 100644 test/CMakeLists.txt
 create mode 100644 test/Unit/CMakeLists.txt
 create mode 100644 test/Unit/ipow.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3f59e89..29eee3e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,11 +38,21 @@ endif()
 add_library(libflang ${libkind} lib/Libflang.cpp
   lib/Core/Core.cpp
   lib/Numerical/Complex.cpp
+  lib/Numerical/Integer.cpp
   lib/Strings/Character.cpp
   lib/IO/Write.cpp
   lib/System/System.cpp
 )
 
+# Tests
+
+macro(add_libflang_test name)
+  add_executable( ${name} ${ARGN} )
+  target_link_libraries( ${name} libflang )
+endmacro(add_libflang_test)
+
+add_subdirectory(test)
+
 set(BUG_REPORT_URL "http://llvm.org/bugs/" CACHE STRING
   "Default URL where bug reports are to be submitted.")
 
diff --git a/include/Numerical/Integer.h b/include/Numerical/Integer.h
new file mode 100644
index 0000000..e41b4f6
--- /dev/null
+++ b/include/Numerical/Integer.h
@@ -0,0 +1,21 @@
+//===--- Integer.h - Integer operations library -----------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBFLANG_NUMERICAL_INTEGER_H
+#define LLVM_LIBFLANG_NUMERICAL_INTEGER_H
+
+#include "Libflang.h"
+#include <stdint.h>
+
+LIBFLANG_ABI int8_t  libflang_pow_i1_i1(int8_t x, int8_t y);
+LIBFLANG_ABI int16_t libflang_pow_i2_i2(int16_t x, int16_t y);
+LIBFLANG_ABI int32_t libflang_pow_i4_i4(int32_t x, int32_t y);
+LIBFLANG_ABI int64_t libflang_pow_i8_i8(int64_t x, int64_t y);
+
+#endif
diff --git a/lib/Numerical/CMakeLists.txt b/lib/Numerical/CMakeLists.txt
index 780074a..5311879 100644
--- a/lib/Numerical/CMakeLists.txt
+++ b/lib/Numerical/CMakeLists.txt
@@ -1,2 +1,3 @@
 add_libflang_library(libflangNumerical
-  Complex.cpp)
+  Complex.cpp
+  Integer.cpp)
diff --git a/lib/Numerical/Integer.cpp b/lib/Numerical/Integer.cpp
new file mode 100644
index 0000000..fd3060e
--- /dev/null
+++ b/lib/Numerical/Integer.cpp
@@ -0,0 +1,29 @@
+#include "Numerical/Integer.h"
+
+template<typename T>
+static T ipow(T x, T y) {
+  if(y >= 0) {
+    T result = 1;
+    for(; y != 0; --y)
+      result *= x;
+    return result;
+  }
+  return 0;
+}
+
+LIBFLANG_ABI int8_t  libflang_pow_i1_i1(int8_t x, int8_t y) {
+  return ipow(x, y);
+}
+
+LIBFLANG_ABI int16_t libflang_pow_i2_i2(int16_t x, int16_t y) {
+  return ipow(x, y);
+}
+
+LIBFLANG_ABI int32_t libflang_pow_i4_i4(int32_t x, int32_t y) {
+  return ipow(x, y);
+}
+
+LIBFLANG_ABI int64_t libflang_pow_i8_i8(int64_t x, int64_t y) {
+  return ipow(x, y);
+}
+
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..57e285f
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(Unit)
diff --git a/test/Unit/CMakeLists.txt b/test/Unit/CMakeLists.txt
new file mode 100644
index 0000000..a5b4a2c
--- /dev/null
+++ b/test/Unit/CMakeLists.txt
@@ -0,0 +1 @@
+add_libflang_test(ipow ipow.cpp)
diff --git a/test/Unit/ipow.cpp b/test/Unit/ipow.cpp
new file mode 100644
index 0000000..0956bb2
--- /dev/null
+++ b/test/Unit/ipow.cpp
@@ -0,0 +1,38 @@
+//===-- ipow.cpp - Test libflang_pow_i*_i* --------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <assert.h>
+#include <iostream>
+#include "Numerical/Integer.h"
+
+bool testPowI4(int32_t x, int32_t y, int32_t expected) {
+  x = libflang_pow_i4_i4(x, y);
+  if(x != expected)
+    std::cout << "Error in libflang_pow_i4_i4 - expected " << expected
+              << ", got " << x << std::endl;
+  return x != expected;
+}
+
+int main() {
+  if(testPowI4(2,2,4))
+    return 1;
+  if(testPowI4(3,3,27))
+    return 1;
+  if(testPowI4(4,1,4))
+    return 1;
+  if(testPowI4(5,0,1))
+    return 1;
+  if(testPowI4(6,-1,0))
+    return 1;
+  if(testPowI4(-1,2,1))
+    return 1;
+  if(testPowI4(-1,-1,0))
+    return 1;
+  return 0;
+}
-- 
cgit v1.2.1