Implement basic support for vectorized instructions.

We use LLVM's Scalarizer pass to remove most vectorized code so that the
Executor only needs to support the InsertElement and ExtractElement
instructions.

This pass was not available in LLVM 3.4 so to support that LLVM version
the pass has been back ported.

To check that the Executor is not receiving vector operand types
that it can't handle assertions have been added.

There are a few limitations to this implementation.

* The InsertElement and ExtractElement index cannot be symbolic.
* There is no support for LLVM < 3.4.

1 files changed, 22 insertions, 0 deletions

diff --git a/test/VectorInstructions/insert_element_symbolic.c b/test/VectorInstructions/insert_element_symbolic.c
new file mode 100644
index 00000000..76df899c
--- /dev/null
+++ b/test/VectorInstructions/insert_element_symbolic.c
@@ -0,0 +1,22 @@
+// REQUIRES: geq-llvm-3.4
+// RUN: %llvmgcc %s -emit-llvm -O0 -g -c -o %t1.bc
+// RUN: rm -rf %t.klee-out
+// RUN: not %klee --output-dir=%t.klee-out --exit-on-error %t1.bc > %t.log 2>&1
+// RUN: FileCheck -input-file=%t.log %s
+#include "klee/klee.h"
+#include <assert.h>
+#include <stdio.h>
+#include <stdint.h>
+
+typedef uint32_t v4ui __attribute__ ((vector_size (16)));
+int main() {
+  v4ui f = { 0, 1, 2, 3 };
+  unsigned index = 0;
+  klee_make_symbolic(&index, sizeof(unsigned), "index");
+  // Performing write should be InsertElement instructions.
+  // For now this is an expected limitation.
+  // CHECK: insert_element_symbolic.c:[[@LINE+1]]: InsertElement, support for symbolic index not implemented
+  f[index] = 255;
+  klee_print_expr("f after write to [0]", f);
+  return 0;
+}