Add several CFG-stress-testing input source files. These use the

preprocessor to build up very large CFGs in various shapes that can
produce different algorithmic behavior in CFG-walking code.

llvm-svn: 134698

1 files changed, 20 insertions, 0 deletions

diff --git a/clang/INPUTS/cfg-long-chain1.c b/clang/INPUTS/cfg-long-chain1.c
new file mode 100644
index 00000000000..2f55b2ada20
--- /dev/null
+++ b/clang/INPUTS/cfg-long-chain1.c
@@ -0,0 +1,20 @@
+#define EXPAND_2_BRANCHES(i, x, y)    BRANCH(i, x, y);              BRANCH(i + 1, x, y);
+#define EXPAND_4_BRANCHES(i, x, y)    EXPAND_2_BRANCHES(i, x, y)    EXPAND_2_BRANCHES(i + 2, x, y)
+#define EXPAND_8_BRANCHES(i, x, y)    EXPAND_4_BRANCHES(i, x, y)    EXPAND_4_BRANCHES(i + 4, x, y)
+#define EXPAND_16_BRANCHES(i, x, y)   EXPAND_8_BRANCHES(i, x, y)    EXPAND_8_BRANCHES(i + 8, x, y)
+#define EXPAND_32_BRANCHES(i, x, y)   EXPAND_16_BRANCHES(i, x, y)   EXPAND_16_BRANCHES(i + 16, x, y)
+#define EXPAND_64_BRANCHES(i, x, y)   EXPAND_32_BRANCHES(i, x, y)   EXPAND_32_BRANCHES(i + 32, x, y)
+#define EXPAND_128_BRANCHES(i, x, y)  EXPAND_64_BRANCHES(i, x, y)   EXPAND_64_BRANCHES(i + 64, x, y)
+#define EXPAND_256_BRANCHES(i, x, y)  EXPAND_128_BRANCHES(i, x, y)  EXPAND_128_BRANCHES(i + 128, x, y)
+#define EXPAND_512_BRANCHES(i, x, y)  EXPAND_256_BRANCHES(i, x, y)  EXPAND_256_BRANCHES(i + 256, x, y)
+#define EXPAND_1024_BRANCHES(i, x, y) EXPAND_512_BRANCHES(i, x, y)  EXPAND_512_BRANCHES(i + 512, x, y)
+#define EXPAND_2048_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i + 1024, x, y)
+#define EXPAND_4096_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i + 2048, x, y)
+
+unsigned cfg_long_chain_single_exit(unsigned x) {
+  unsigned y = 0;
+#define BRANCH(i, x, y) if ((x % 13171) < i) { int var = x / 13171; y ^= var; }
+  EXPAND_4096_BRANCHES(1, x, y);
+#undef BRANCH
+  return y;
+}