include/qemu/int128: Use Int128 structure for TCI

We are about to allow passing Int128 to/from tcg helper functions,
but libffi doesn't support __int128_t, so use the structure.

In order for atomic128.h to continue working, we must provide
a mechanism to frob between real __int128_t and the structure.
Provide a new union, Int128Alias, for this.  We cannot modify
Int128 itself, as any changed alignment would also break libffi.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/util/int128.c b/util/int128.c
index ed8f25fef1..df6c6331bd 100644
--- a/util/int128.c
+++ b/util/int128.c
@@ -144,4 +144,46 @@ Int128 int128_rems(Int128 a, Int128 b)
     return r;
 }
 
+#elif defined(CONFIG_TCG_INTERPRETER)
+
+Int128 int128_divu(Int128 a_s, Int128 b_s)
+{
+    Int128Alias r, a, b;
+
+    a.s = a_s;
+    b.s = b_s;
+    r.u = a.u / b.u;
+    return r.s;
+}
+
+Int128 int128_remu(Int128 a_s, Int128 b_s)
+{
+    Int128Alias r, a, b;
+
+    a.s = a_s;
+    b.s = b_s;
+    r.u = a.u % b.u;
+    return r.s;
+}
+
+Int128 int128_divs(Int128 a_s, Int128 b_s)
+{
+    Int128Alias r, a, b;
+
+    a.s = a_s;
+    b.s = b_s;
+    r.i = a.i / b.i;
+    return r.s;
+}
+
+Int128 int128_rems(Int128 a_s, Int128 b_s)
+{
+    Int128Alias r, a, b;
+
+    a.s = a_s;
+    b.s = b_s;
+    r.i = a.i % b.i;
+    return r.s;
+}
+
 #endif