1 files changed, 54 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/vect/vect-recurr-pr121256.c b/gcc/testsuite/gcc.dg/vect/vect-recurr-pr121256.c
new file mode 100644
index 0000000..c895e94
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-recurr-pr121256.c
@@ -0,0 +1,54 @@
+/* { dg-additional-options "-mavx2" { target avx2_runtime } } */
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include "tree-vect.h"
+
+#define B 0
+#define G 1
+#define R 2
+#define A 3
+
+int red = 153;
+int green = 66;
+int blue = 187;
+int alpha = 255;
+
+static void __attribute__((noipa))
+sub_left_prediction_bgr32(uint8_t *restrict dst, uint8_t *restrict src, int w)
+{
+  for (int i = 0; i < 8; i++) {
+    int rt = src[i * 4 + R];
+    int gt = src[i * 4 + G];
+    int bt = src[i * 4 + B];
+    int at = src[i * 4 + A];
+
+    dst[i * 4 + R] = rt - red;
+    dst[i * 4 + G] = gt - green;
+    dst[i * 4 + B] = bt - blue;
+    dst[i * 4 + A] = at - alpha;
+
+    red = rt;
+    green = gt;
+    blue = bt;
+    alpha = at;
+  }
+}
+
+int main()
+{
+  check_vect ();
+
+  uint8_t *dst = calloc(36, sizeof(uint8_t));
+  uint8_t *src = calloc(36, sizeof(uint8_t));
+
+  src[R] = 160;
+  src[G] = 73;
+  src[B] = 194;
+  src[A] = 255;
+
+  sub_left_prediction_bgr32(dst, src, 33);
+  if (dst[R] != 7 || dst[B] != 7 || dst[A] != 0)
+    __builtin_abort();
+}