From fd91749e5a4feb45eafa91a0fd76685a104ad5e0 Mon Sep 17 00:00:00 2001
From: Jussi Pakkanen <jpakkane@gmail.com>
Date: Thu, 9 Feb 2017 21:41:02 +0200
Subject: The beginning of a test that checks for various SIMD implementations.

---
 test cases/common/139 simd/fallback.c    |  7 +++++++
 test cases/common/139 simd/meson.build   | 13 +++++++++++++
 test cases/common/139 simd/simdchecker.c | 31 +++++++++++++++++++++++++++++++
 test cases/common/139 simd/simdfuncs.h   | 15 +++++++++++++++
 4 files changed, 66 insertions(+)
 create mode 100644 test cases/common/139 simd/fallback.c
 create mode 100644 test cases/common/139 simd/meson.build
 create mode 100644 test cases/common/139 simd/simdchecker.c
 create mode 100644 test cases/common/139 simd/simdfuncs.h

diff --git a/test cases/common/139 simd/fallback.c b/test cases/common/139 simd/fallback.c
new file mode 100644
index 0000000..2b98304
--- /dev/null
+++ b/test cases/common/139 simd/fallback.c	
@@ -0,0 +1,7 @@
+#include<simdfuncs.h>
+
+void increment_fallback(float arr[4]) {
+    for(int i=0; i<4; i++) {
+        arr[i]++;
+    }
+}
diff --git a/test cases/common/139 simd/meson.build b/test cases/common/139 simd/meson.build
new file mode 100644
index 0000000..b26d007
--- /dev/null
+++ b/test cases/common/139 simd/meson.build	
@@ -0,0 +1,13 @@
+project('simd', 'c')
+
+cdata = configuration_data()
+
+#cdata.set('HAVE_MMX', 1)
+
+configure_file(output : 'simdconfig.h',
+  configuration : cdata)
+
+p = executable('simdtest', 'simdchecker.c', 'fallback.c')
+
+test('simdtest', p)
+
diff --git a/test cases/common/139 simd/simdchecker.c b/test cases/common/139 simd/simdchecker.c
new file mode 100644
index 0000000..bcc6cef
--- /dev/null
+++ b/test cases/common/139 simd/simdchecker.c	
@@ -0,0 +1,31 @@
+#include<simdfuncs.h>
+#include<stdio.h>
+
+/*
+ * A function that checks at runtime if simd acceleration is
+ * available and calls the respective function if it is. Falls
+ * back to plain C implementation if not.
+ */
+
+int main(int argc, char **argv) {
+    float four[4] = {2.0, 3.0, 4.0, 5.0};
+    const float expected[4] = {3.0, 4.0, 5.0, 6.0};
+    void (*fptr)(float[4]) = NULL;
+
+#if HAVE_MMX
+    if(mmx_available()) {
+        fptr = increment_mmx;
+    }
+#endif
+    if(fptr == NULL) {
+        fptr = increment_fallback;
+    }
+    fptr(four);
+    for(int i=0; i<4; i++) {
+        if(four[i] != expected[i]) {
+            printf("Increment function failed.\n");
+            return 1;
+        }
+    }
+    return 0;
+}
diff --git a/test cases/common/139 simd/simdfuncs.h b/test cases/common/139 simd/simdfuncs.h
new file mode 100644
index 0000000..17c627e
--- /dev/null
+++ b/test cases/common/139 simd/simdfuncs.h	
@@ -0,0 +1,15 @@
+#pragma once
+
+#include<simdconfig.h>
+
+/* Yes, I do know that arr[4] decays into a pointer
+ * here. Don't do this in real code but for test code
+ * it is ok.
+ */
+
+void increment_fallback(float arr[4]);
+
+#if HAVE_MMX
+void increment_mmx(float arr[4]);
+#endif
+
-- 
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