Import isl(+imath) as an external library into Polly

With this patch Polly is always GPL-free (no dependency on GMP any more). As a
result, building and distributing Polly will be easier. Furthermore, there is no
need to tightly coordinate isl and Polly releases anymore.

We import isl b3e0fa7a05d as well as imath 4d707e5ef2. These are the git
versions Polly currently was tested with when using utils/checkout_isl.sh. The
imported libraries are both MIT-style licensed.

We build isl and imath with -fvisibility=hidden to avoid clashes in case other
projects (such as gcc) use conflicting versions of isl. The use of imath can
temporarily reduce compile-time performance of Polly. We will work on
performance tuning in tree.

Patches to isl should be contributed first to the main isl repository and can
then later be reimported to Polly.

This patch is also a prerequisite for the upcoming isl C++ interface.

llvm-svn: 228193

1 files changed, 34 insertions, 0 deletions

diff --git a/polly/lib/External/isl/isl_ctx_private.h b/polly/lib/External/isl/isl_ctx_private.h
new file mode 100644
index 00000000000..b4bb2a5e46c
--- /dev/null
+++ b/polly/lib/External/isl/isl_ctx_private.h
@@ -0,0 +1,34 @@
+#include <isl/ctx.h>
+#include <isl_blk.h>
+
+struct isl_ctx {
+	int			ref;
+
+	struct isl_stats	*stats;
+
+	int			 opt_allocated;
+	struct isl_options	*opt;
+	void			*user_opt;
+	struct isl_args		*user_args;
+
+	isl_int			zero;
+	isl_int			one;
+	isl_int			two;
+	isl_int			negone;
+
+	isl_int			normalize_gcd;
+
+	int			n_cached;
+	int			n_miss;
+	struct isl_blk		cache[ISL_BLK_CACHE_SIZE];
+	struct isl_hash_table	id_table;
+
+	enum isl_error		error;
+
+	int			abort;
+
+	unsigned long		operations;
+	unsigned long		max_operations;
+};
+
+int isl_ctx_next_operation(isl_ctx *ctx);