sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 66 insertions, 0 deletions

diff --git a/support/regression/tests/bug-2866.c b/support/regression/tests/bug-2866.c
new file mode 100644
index 0000000..d79c640
--- /dev/null
+++ b/support/regression/tests/bug-2866.c
@@ -0,0 +1,66 @@
+/* bug-2866.c
+   A bug in rematerialization in the z80 backend.
+ */
+
+#include <testfwk.h>
+
+typedef unsigned char uint8;
+typedef int int16;
+
+#define COL_MAX_HEIGHT 64
+#define COL_TEX_HEIGHT 32
+
+#ifndef __SDCC_pdk14 // Lack of memory
+uint8 single_column[COL_MAX_HEIGHT];
+
+void initSingleColumn(int16 height)
+{
+    int16 y;
+    int16 y0;
+    int16 y1;
+    int16 dy;
+    int16 dv;
+    int16 v;
+
+    y0 = (COL_MAX_HEIGHT - height) >> 1;
+    y1 = COL_MAX_HEIGHT - y0;
+
+    dy = y1 - y0 - 1;
+    if (dy < 1) dy = 1;
+    dv = (COL_TEX_HEIGHT << 8) / dy;
+    v = 0;
+
+    if (y0 < 0)
+    {
+        v -= y0 * dv;
+        y0 = 0;
+    }
+    if (y1 > COL_MAX_HEIGHT) y1 = COL_MAX_HEIGHT;
+
+    for (y = 0; y<y0; y++)
+    {
+        single_column[y] = 128;
+        single_column[COL_MAX_HEIGHT - y - 1] = 64; // Bug resulted in wrong address calculation here.
+    }
+
+    for (y = y0; y < y1; y++)
+    {
+        if (v > (31 << 8)) v = 31 << 8;
+        single_column[y] = (v >> 8);
+        v+=dv;
+    }
+}
+#endif
+
+void testBug(void)
+{
+#ifndef __SDCC_pdk14 // Lack of memory
+    initSingleColumn (0);
+
+    ASSERT (single_column[0x00] == 0x80);
+    ASSERT (single_column[0x1f] == 0x80);
+    ASSERT (single_column[0x20] == 0x40);
+    ASSERT (single_column[0x3f] == 0x40);
+#endif
+}
+