From 8e8732d482e42e363f0f4c51794ed966701371e7 Mon Sep 17 00:00:00 2001 From: Dan Liew Date: Wed, 24 May 2017 16:32:47 +0100 Subject: 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. --- test/VectorInstructions/insert_element.c | 46 ++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 test/VectorInstructions/insert_element.c (limited to 'test/VectorInstructions/insert_element.c') diff --git a/test/VectorInstructions/insert_element.c b/test/VectorInstructions/insert_element.c new file mode 100644 index 00000000..8397dceb --- /dev/null +++ b/test/VectorInstructions/insert_element.c @@ -0,0 +1,46 @@ +// REQUIRES: geq-llvm-3.4 +// RUN: %llvmgcc %s -emit-llvm -O0 -g -c -o %t1.bc +// RUN: rm -rf %t.klee-out +// NOTE: Have to pass `--optimize=false` to avoid vector operations being +// constant folded away. +// RUN: %klee --output-dir=%t.klee-out --optimize=false %t1.bc > %t.stdout.log 2> %t.stderr.log +// RUN: FileCheck -check-prefix=CHECK-STDOUT -input-file=%t.stdout.log %s +// RUN: FileCheck -check-prefix=CHECK-STDERR -input-file=%t.stderr.log %s +#include +#include +#include + +typedef uint32_t v4ui __attribute__ ((vector_size (16))); +int main() { + v4ui f = { 0, 1, 2, 3 }; + klee_print_expr("f:=", f); + // Performing these writes should be InsertElement instructions + f[0] = 255; + klee_print_expr("f after write to [0]", f); + f[1] = 128; + klee_print_expr("f after write to [1]", f); + f[2] = 1; + klee_print_expr("f after write to [2]", f); + f[3] = 19; + klee_print_expr("f after write to [3]", f); + // CHECK-STDOUT: f[0]=255 + printf("f[0]=%u\n", f[0]); + // CHECK-STDOUT: f[1]=128 + printf("f[1]=%u\n", f[1]); + // CHECK-STDOUT: f[2]=1 + printf("f[2]=%u\n", f[2]); + // CHECK-STDOUT: f[3]=19 + printf("f[3]=%u\n", f[3]); + // CHECK-STDERR-NOT: insert_element.c:[[@LINE+1]]: ASSERTION FAIL + assert(f[0] == 255); + // CHECK-STDERR-NOT: insert_element.c:[[@LINE+1]]: ASSERTION FAIL + assert(f[1] == 128); + // CHECK-STDERR-NOT: insert_element.c:[[@LINE+1]]: ASSERTION FAIL + assert(f[2] == 1); + // CHECK-STDERR-NOT: insert_element.c:[[@LINE+1]]: ASSERTION FAIL + assert(f[3] == 19); + + // CHECK-STDERR: insert_element.c:[[@LINE+1]]: Out of bounds write when inserting element + f[4] = 255; // Out of bounds write + return 0; +} -- cgit 1.4.1