diff --git a/tests/str_c.c b/tests/str_c.c
new file mode 100644
index 000000000..eb04a85df
--- /dev/null
+++ b/tests/str_c.c
@@ -0,0 +1,35 @@
+#include "test.h"
+
+static uint8_t data[] = { 0x12, 0x00, 0x34 };
+
+static void
+run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
+{
+  jit_begin(j, arena_base, arena_size);
+
+  const jit_arg_abi_t abi[] = { JIT_ARG_ABI_POINTER, JIT_ARG_ABI_INT8 };
+  jit_arg_t args[2];
+  const jit_anyreg_t regs[] = { { .gpr=JIT_R0 }, { .gpr=JIT_R1 } };
+
+  jit_receive(j, 2, abi, args);
+  jit_load_args(j, 2, abi, args, regs);
+
+  jit_str_c(j, JIT_R0, JIT_R1);
+  jit_ret(j);
+
+  void (*f)(void*, int8_t) = jit_end(j, NULL);
+
+  ASSERT(data[0] == 0x12);
+  ASSERT(data[1] == 0x00);
+  ASSERT(data[2] == 0x34);
+  f(&data[1], -1);
+  ASSERT(data[0] == 0x12);
+  ASSERT(data[1] == 0xff);
+  ASSERT(data[2] == 0x34);
+}
+
+int
+main (int argc, char *argv[])
+{
+  return main_helper(argc, argv, run_test);
+}
diff --git a/tests/str_d.c b/tests/str_d.c
new file mode 100644
index 000000000..2850553ff
--- /dev/null
+++ b/tests/str_d.c
@@ -0,0 +1,35 @@
+#include "test.h"
+
+static double data[] = { -1.0, 0.0, 0.5 };
+
+static void
+run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
+{
+  jit_begin(j, arena_base, arena_size);
+
+  const jit_arg_abi_t abi[] = { JIT_ARG_ABI_POINTER, JIT_ARG_ABI_DOUBLE };
+  jit_arg_t args[2];
+  const jit_anyreg_t regs[] = { { .gpr=JIT_R0 }, { .fpr=JIT_F0 } };
+
+  jit_receive(j, 2, abi, args);
+  jit_load_args(j, 2, abi, args, regs);
+
+  jit_str_d(j, JIT_F0, JIT_R0);
+  jit_ret(j);
+
+  void (*f)(void*, double) = jit_end(j, NULL);
+
+  ASSERT(data[0] == -1.0);
+  ASSERT(data[1] == 0.0);
+  ASSERT(data[2] == 0.5);
+  f(&data[1], 42.5);
+  ASSERT(data[0] == -1.0);
+  ASSERT(data[1] == 42.5);
+  ASSERT(data[2] == 0.5);
+}
+
+int
+main (int argc, char *argv[])
+{
+  return main_helper(argc, argv, run_test);
+}
diff --git a/tests/str_f.c b/tests/str_f.c
new file mode 100644
index 000000000..5d1138f2b
--- /dev/null
+++ b/tests/str_f.c
@@ -0,0 +1,35 @@
+#include "test.h"
+
+static float data[] = { -1.0, 0.0, 0.5 };
+
+static void
+run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
+{
+  jit_begin(j, arena_base, arena_size);
+
+  const jit_arg_abi_t abi[] = { JIT_ARG_ABI_POINTER, JIT_ARG_ABI_FLOAT };
+  jit_arg_t args[2];
+  const jit_anyreg_t regs[] = { { .gpr=JIT_R0 }, { .fpr=JIT_F0 } };
+
+  jit_receive(j, 2, abi, args);
+  jit_load_args(j, 2, abi, args, regs);
+
+  jit_str_f(j, JIT_F0, JIT_R0);
+  jit_ret(j);
+
+  void (*f)(void*, float) = jit_end(j, NULL);
+
+  ASSERT(data[0] == -1.0f);
+  ASSERT(data[1] == 0.0f);
+  ASSERT(data[2] == 0.5f);
+  f(&data[1], 42.5f);
+  ASSERT(data[0] == -1.0f);
+  ASSERT(data[1] == 42.5f);
+  ASSERT(data[2] == 0.5f);
+}
+
+int
+main (int argc, char *argv[])
+{
+  return main_helper(argc, argv, run_test);
+}
diff --git a/tests/str_i.c b/tests/str_i.c
new file mode 100644
index 000000000..7dd6d8c78
--- /dev/null
+++ b/tests/str_i.c
@@ -0,0 +1,35 @@
+#include "test.h"
+
+static uint32_t data[] = { 0x12121212, 0x00000000, 0x34343434 };
+
+static void
+run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
+{
+  jit_begin(j, arena_base, arena_size);
+
+  const jit_arg_abi_t abi[] = { JIT_ARG_ABI_POINTER, JIT_ARG_ABI_INT32 };
+  jit_arg_t args[2];
+  const jit_anyreg_t regs[] = { { .gpr=JIT_R0 }, { .gpr=JIT_R1 } };
+
+  jit_receive(j, 2, abi, args);
+  jit_load_args(j, 2, abi, args, regs);
+
+  jit_str_i(j, JIT_R0, JIT_R1);
+  jit_ret(j);
+
+  void (*f)(void*, int32_t) = jit_end(j, NULL);
+
+  ASSERT(data[0] == 0x12121212);
+  ASSERT(data[1] == 0x00);
+  ASSERT(data[2] == 0x34343434);
+  f(&data[1], -1);
+  ASSERT(data[0] == 0x12121212);
+  ASSERT(data[1] == 0xffffffff);
+  ASSERT(data[2] == 0x34343434);
+}
+
+int
+main (int argc, char *argv[])
+{
+  return main_helper(argc, argv, run_test);
+}
diff --git a/tests/str_l.c b/tests/str_l.c
new file mode 100644
index 000000000..8a1b905ea
--- /dev/null
+++ b/tests/str_l.c
@@ -0,0 +1,37 @@
+#include "test.h"
+
+static uint64_t data[] = { 0x1212121212121212, 0, 0x3434343434343434 };
+
+static void
+run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
+{
+#if __WORDSIZE > 32
+  jit_begin(j, arena_base, arena_size);
+
+  const jit_arg_abi_t abi[] = { JIT_ARG_ABI_POINTER, JIT_ARG_ABI_INT64 };
+  jit_arg_t args[2];
+  const jit_anyreg_t regs[] = { { .gpr=JIT_R0 }, { .gpr=JIT_R1 } };
+
+  jit_receive(j, 2, abi, args);
+  jit_load_args(j, 2, abi, args, regs);
+
+  jit_str_l(j, JIT_R0, JIT_R1);
+  jit_ret(j);
+
+  void (*f)(void*, int64_t) = jit_end(j, NULL);
+
+  ASSERT(data[0] == 0x1212121212121212);
+  ASSERT(data[1] == 0x00);
+  ASSERT(data[2] == 0x3434343434343434);
+  f(&data[1], -1);
+  ASSERT(data[0] == 0x1212121212121212);
+  ASSERT(data[1] == 0xffffffffffffffff);
+  ASSERT(data[2] == 0x3434343434343434);
+#endif
+}
+
+int
+main (int argc, char *argv[])
+{
+  return main_helper(argc, argv, run_test);
+}
diff --git a/tests/str_s.c b/tests/str_s.c
new file mode 100644
index 000000000..97932ad31
--- /dev/null
+++ b/tests/str_s.c
@@ -0,0 +1,35 @@
+#include "test.h"
+
+static uint16_t data[] = { 0x1212, 0x0000, 0x3434 };
+
+static void
+run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
+{
+  jit_begin(j, arena_base, arena_size);
+
+  const jit_arg_abi_t abi[] = { JIT_ARG_ABI_POINTER, JIT_ARG_ABI_INT16 };
+  jit_arg_t args[2];
+  const jit_anyreg_t regs[] = { { .gpr=JIT_R0 }, { .gpr=JIT_R1 } };
+
+  jit_receive(j, 2, abi, args);
+  jit_load_args(j, 2, abi, args, regs);
+
+  jit_str_s(j, JIT_R0, JIT_R1);
+  jit_ret(j);
+
+  void (*f)(void*, int16_t) = jit_end(j, NULL);
+
+  ASSERT(data[0] == 0x1212);
+  ASSERT(data[1] == 0);
+  ASSERT(data[2] == 0x3434);
+  f(&data[1], -1);
+  ASSERT(data[0] == 0x1212);
+  ASSERT(data[1] == 0xffff);
+  ASSERT(data[2] == 0x3434);
+}
+
+int
+main (int argc, char *argv[])
+{
+  return main_helper(argc, argv, run_test);
+}