1 files changed, 140 insertions, 0 deletions
diff --git a/Client/ThirdParty/libfixmath/benchmarks/generate_testcases.py b/Client/ThirdParty/libfixmath/benchmarks/generate_testcases.py
new file mode 100644
index 0000000..560ba4d
--- /dev/null
+++ b/Client/ThirdParty/libfixmath/benchmarks/generate_testcases.py
@@ -0,0 +1,140 @@
+'''This script precalculates the correct solutions for a set of test numbers,
+and writes them to testcases.c. This is aimed for running the tests on-target,
+therefore it doesn't test all the cases or use floating point math, but
+instead generates a ~10k binary.
+
+The tests are chosen randomly, so there is quite good chance to eventually
+catch most errors. Because the list is not regenerated automatically, the
+functioning of the benchmark application is still deterministic and easy
+to debug.
+'''
+
+import math
+import random
+import struct
+
+# Fix16 scaling factor
+scale = 65536.
+
+# Fix16 overflow indicator
+overflow = -2**31
+
+def f16_to_float(val):
+    return val / scale
+
+def float_to_f16(val):
+    val = int(round(val * scale))
+    if val >= 2**31 or val < -2**31:
+        val = overflow
+    return val
+
+def to_ui32(val):
+    return struct.unpack('I', struct.pack('i', val))[0]
+
+testcases = [
+    # Small numbers
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
+    -1, -2, -3, -4, -5, -6, -7, -8, -9, -10,
+    
+    # Integer numbers
+    0x10000, -0x10000, 0x20000, -0x20000, 0x30000, -0x30000,
+    0x40000, -0x40000, 0x50000, -0x50000, 0x60000, -0x60000,
+    
+    # Fractions (1/2, 1/4, 1/8)
+    0x8000, -0x8000, 0x4000, -0x4000, 0x2000, -0x2000,
+    
+    # Problematic carry
+    0xFFFF, -0xFFFF, 0x1FFFF, -0x1FFFF, 0x3FFFF, -0x3FFFF,
+    
+    # Smallest and largest values
+    0x7FFFFFFF, -0x80000000
+]
+    
+for i in range(10):
+    # Large random numbers
+    testcases.append(random.randint(-0x80000000, 0x7FFFFFFF))
+    
+    # Small random numbers
+    testcases.append(random.randint(-100000, 100000))
+    
+    # Tiny random numbers
+    testcases.append(random.randint(-200, 200))
+
+out = open("testcases.c", "w")
+
+out.write('''
+/* Automatically generated testcases for fix16 operations
+ * See generate_testcases.py for the generator.
+ */
+
+#include <fix16.h>
+
+typedef struct {
+    // Input
+    fix16_t a;
+    
+    // Correct output
+    fix16_t sqrt;
+    fix16_t exp;
+} fix16_1op_testcase;
+
+typedef struct {
+    // Inputs
+    fix16_t a;
+    fix16_t b;
+    
+    // Correct output
+    fix16_t add;
+    fix16_t sub;
+    fix16_t mul;
+    fix16_t div;
+} fix16_2op_testcase;
+
+#define TESTCASES1_COUNT (sizeof(testcases1)/sizeof(testcases1[0]))
+#define TESTCASES2_COUNT (sizeof(testcases2)/sizeof(testcases2[0]))
+
+''')
+
+# Write testcases for 1-operand functions
+
+out.write('static const fix16_1op_testcase testcases1[] = {\n')
+
+for i in range(10):
+    a = random.choice(testcases)
+    if a >= 0:
+        sqrt = float_to_f16(math.sqrt(f16_to_float(a)))
+    else:
+        sqrt = 0
+    
+    try:
+        exp = float_to_f16(math.exp(f16_to_float(a)))
+    except OverflowError:
+        exp = 0x7FFFFFFF
+        
+    out.write('    {0x%08x, 0x%08x, 0x%08x}, // %d\n'
+    % (to_ui32(a), to_ui32(sqrt), to_ui32(exp), i))
+
+out.write('};\n\n')
+
+# Write testcases for 2-operand functions
+
+out.write('static const fix16_2op_testcase testcases2[] = {\n')
+
+for i in range(50):
+    a = random.choice(testcases)
+    b = random.choice(testcases)
+    
+    add = float_to_f16(f16_to_float(a) + f16_to_float(b))
+    sub = float_to_f16(f16_to_float(a) - f16_to_float(b))
+    mul = float_to_f16(f16_to_float(a) * f16_to_float(b))
+    if b != 0:
+        div = float_to_f16(f16_to_float(a) / f16_to_float(b))
+    else:
+        div = 0
+    out.write('    {0x%08x, 0x%08x, 0x%08x, 0x%08x, 0x%08x, 0x%08x}, // %d\n'
+        % (to_ui32(a), to_ui32(b), to_ui32(add), to_ui32(sub), to_ui32(mul), to_ui32(div), i))
+
+out.write('};\n\n')
+
+out.close()
+