diff --git a/.gitignore b/.gitignore
index 3192b9a..58b21ee 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *~
 obj
-build
+build/
+test/
diff --git a/Makefile b/Makefile
index b283fea..47fa08f 100644
--- a/Makefile
+++ b/Makefile
@@ -5,10 +5,12 @@ PROJECT=shuffle3
 
 BUILD=build
 
+OPT_FLAGS?= -march=native -fgraphite -fopenmp -floop-parallelize-all -ftree-parallelize-loops=4
+
 CFLAGS+= $(addprefix -I,$(INCLUDE)) -Wall -pedantic --std=gnu11
 LDFLAGS+= -lm
 
-RELEASE_CFLAGS?= -O3 -march=native -flto -fgraphite
+RELEASE_CFLAGS?= -O3 -flto $(OPT_FLAGS)
 RELEASE_LDFLAGS?= -O3 -flto
 
 DEBUG_CFLAGS?= -g -O0
diff --git a/src/main.c b/src/main.c
index 3ccc830..dfc3d24 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,6 +2,7 @@
 #include <float.h>
 #include <stdint.h>
 #include <string.h>
+#include <assert.h>
 
 #include <rng.h>
 #include <rng_algos.h>
@@ -194,7 +195,14 @@ array_t read_whole_file(S_NAMED_LEXENV(base), FILE* fp)
 	array_t ar;
 	MANAGED({
 		void* buf = smalloc(sz);
-		fread(buf, 1, sz, fp);
+			
+		register size_t read;
+		register size_t full=0;
+		while ((read=fread(buf, 1, sz-full, fp))>0)
+			full+=read;
+		
+		assert(full == sz);
+	
 		ar = ar_create_memory_from(base, buf, 1, sz);
 	});
 	return ar;