1 files changed, 75 insertions, 0 deletions
diff --git a/isa/rv64uzbb/ctz.S b/isa/rv64uzbb/ctz.S
new file mode 100644
index 0000000..21b2426
--- /dev/null
+++ b/isa/rv64uzbb/ctz.S
@@ -0,0 +1,75 @@
+# See LICENSE for license details.
+
+#*****************************************************************************
+# ctz.S
+#-----------------------------------------------------------------------------
+#
+# Test ctz instruction.
+#
+
+#include "riscv_test.h"
+#include "test_macros.h"
+
+RVTEST_RV64U
+RVTEST_CODE_BEGIN
+
+  #-------------------------------------------------------------
+  # Arithmetic tests
+  #-------------------------------------------------------------
+
+  TEST_R_OP( 2,  ctz, 64, 0x0000000000000000);
+  TEST_R_OP( 3,  ctz, 0, 0x0000000000000001);
+  TEST_R_OP( 4,  ctz, 0, 0x0000000000000003);
+
+  TEST_R_OP( 5,  ctz, 15, 0xffffffffffff8000 );
+  TEST_R_OP( 6,  ctz, 23, 0x0000000000800000 );
+  TEST_R_OP( 7,  ctz, 15, 0x0004ffffffff8000 );
+
+  TEST_R_OP( 8,  ctz, 0, 0x0000000000007fff);
+  TEST_R_OP( 9,  ctz, 0, 0x000000007fffffff);
+  TEST_R_OP( 10, ctz, 0, 0x000000000007ffff );
+
+  TEST_R_OP( 11, ctz, 31, 0xffffffff80000000);
+  TEST_R_OP( 12, ctz, 12, 0x00ff578f121f5000);
+
+  TEST_R_OP( 13, ctz, 63, 0x8000000000000000);
+  TEST_R_OP( 14, ctz, 1, 0x000000000000000e);
+  TEST_R_OP( 15, ctz, 0, 0xa000000320401341);
+
+  #-------------------------------------------------------------
+  # Source/Destination tests
+  #-------------------------------------------------------------
+
+  TEST_R_SRC1_EQ_DEST( 16, ctz, 0, 13);
+  TEST_R_SRC1_EQ_DEST( 17, ctz, 0, 11);
+
+  #-------------------------------------------------------------
+  # Bypassing tests
+  #-------------------------------------------------------------
+
+  TEST_R_DEST_BYPASS( 18, 0, ctz, 0, 13);
+  TEST_R_DEST_BYPASS( 29, 1, ctz, 0, 19);
+  TEST_R_DEST_BYPASS( 20, 2, ctz, 1, 34);
+
+  #-------------------------------------------------------------
+  # Other tests
+  #-------------------------------------------------------------
+
+  TEST_R_OP( 21,  ctz, 15, 0x00000000007f8000 );
+  TEST_R_OP( 22,  ctz, 15, 0x0000000000808000 );
+  TEST_R_OP( 23,  ctz, 12, 0x0000000001809000 );
+
+  TEST_R_OP( 24,  ctz, 0, 0x0000000300007fff);
+  TEST_R_OP( 25,  ctz, 0, 0x000000077fffffff);
+  TEST_R_OP( 26,  ctz, 0, 0x0000000f0007ffff);
+
+  TEST_PASSFAIL
+
+RVTEST_CODE_END
+
+  .data
+RVTEST_DATA_BEGIN
+
+  TEST_DATA
+
+RVTEST_DATA_END