[PATCH v3 4/4] tests/tcg/s390x: Test CONVERT TO BINARY

[Ilya Leoshkevich <iii@linux.ibm.com>]

Check the CVB's and CVBG's corner cases.

Co-developed-by: Pavel Zbitskiy <pavel.zbitskiy@gmail.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tests/tcg/s390x/Makefile.target |  1 +
 tests/tcg/s390x/cvb.c           | 47 +++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 tests/tcg/s390x/cvb.c

diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
index 04e4bddd83d..e2aba2ec274 100644
--- a/tests/tcg/s390x/Makefile.target
+++ b/tests/tcg/s390x/Makefile.target
@@ -46,6 +46,7 @@ TESTS+=laalg
 TESTS+=add-logical-with-carry
 TESTS+=lae
 TESTS+=cvd
+TESTS+=cvb
 
 cdsg: CFLAGS+=-pthread
 cdsg: LDFLAGS+=-pthread
diff --git a/tests/tcg/s390x/cvb.c b/tests/tcg/s390x/cvb.c
new file mode 100644
index 00000000000..47b7a7965f4
--- /dev/null
+++ b/tests/tcg/s390x/cvb.c
@@ -0,0 +1,47 @@
+/*
+ * Test the CONVERT TO DECIMAL instruction.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+static int32_t cvb(uint64_t x)
+{
+    uint32_t ret;
+
+    asm("cvb %[ret],%[x]" : [ret] "=r" (ret) : [x] "R" (x));
+
+    return ret;
+}
+
+static int64_t cvbg(__uint128_t x)
+{
+    int64_t ret;
+
+    asm("cvbg %[ret],%[x]" : [ret] "=r" (ret) : [x] "T" (x));
+
+    return ret;
+}
+
+int main(void)
+{
+    __uint128_t m = (((__uint128_t)0x9223372036854775) << 16) | 0x8070;
+
+    assert(cvb(0xc) == 0);
+    assert(cvb(0x1c) == 1);
+    assert(cvb(0x25594c) == 25594);
+    assert(cvb(0x1d) == -1);
+    assert(cvb(0x2147483647c) == 0x7fffffff);
+    assert(cvb(0x2147483647d) == -0x7fffffff);
+
+    assert(cvbg(0xc) == 0);
+    assert(cvbg(0x1c) == 1);
+    assert(cvbg(0x25594c) == 25594);
+    assert(cvbg(0x1d) == -1);
+    assert(cvbg(m | 0xc) == 0x7fffffffffffffff);
+    assert(cvbg(m | 0xd) == -0x7fffffffffffffff);
+
+    return EXIT_SUCCESS;
+}
-- 
2.43.0