diff --git a/tests/asm/f80/fxaddxx-1.S b/tests/asm/f80/fxaddxx-1.S
new file mode 100644
index 0000000..c3f246e
--- /dev/null
+++ b/tests/asm/f80/fxaddxx-1.S
@@ -0,0 +1,14 @@
+#include "test_start.S"
+
+        setwd wsz=8, nfx=0
+        shld,0 1, 63, %r0
+    {
+        movif,0 %r0, 0x4000, %r0
+        movif,1 %r0, 0x4001, %r1
+    }
+        fxaddxx,0 %r0, %r1, %r2
+        movfi,0 %r2, %r3
+        assert_eq_i64(%r2, 0xc000000000000000)
+        assert_eq_i32(%r3, 0x4001)
+
+#include "test_end.S"
diff --git a/tests/asm/f80/fxmulxx-1.S b/tests/asm/f80/fxmulxx-1.S
new file mode 100644
index 0000000..d82ce05
--- /dev/null
+++ b/tests/asm/f80/fxmulxx-1.S
@@ -0,0 +1,14 @@
+#include "test_start.S"
+
+        setwd wsz=8, nfx=0
+        shld,0 1, 63, %r0
+    {
+        movif,0 %r0, 0x4000, %r0
+        movif,1 %r0, 0x4001, %r1
+    }
+        fxmulxx,0 %r0, %r1, %r2
+        movfi,0 %r2, %r3
+        assert_eq_i64(%r2, 0x8000000000000000)
+        assert_eq_i32(%r3, 0x4002)
+
+#include "test_end.S"
diff --git a/tests/asm/f80/fxsubxx-1.S b/tests/asm/f80/fxsubxx-1.S
new file mode 100644
index 0000000..bd74534
--- /dev/null
+++ b/tests/asm/f80/fxsubxx-1.S
@@ -0,0 +1,14 @@
+#include "test_start.S"
+
+        setwd wsz=8, nfx=0
+        shld,0 1, 63, %r0
+    {
+        movif,0 %r0, 0x4000, %r0
+        movif,1 %r0, 0x4001, %r1
+    }
+        fxsubxx,0 %r0, %r1, %r2
+        movfi,0 %r2, %r3
+        assert_eq_i64(%r2, 0x8000000000000000)
+        assert_eq_i32(%r3, 0xc000)
+
+#include "test_end.S"
diff --git a/tests/asm/f80/movif-movfi-1.S b/tests/asm/f80/movif-movfi-1.S
new file mode 100644
index 0000000..ea42ff2
--- /dev/null
+++ b/tests/asm/f80/movif-movfi-1.S
@@ -0,0 +1,10 @@
+#include "test_start.S"
+
+        setwd wsz=8, nfx=0
+        addd,0 0, 0xaaaaaaaa, %g16
+        movif %g16, 0xbeef, %g17
+        movfi %g17, %g18
+        assert_eq_i64(%g17, 0xaaaaaaaa)
+        assert_eq_i32(%g18, 0xbeef)
+
+#include "test_end.S"
diff --git a/tests/asm/meson.build b/tests/asm/meson.build
index 99c1e81..12ae9d7 100644
--- a/tests/asm/meson.build
+++ b/tests/asm/meson.build
@@ -190,6 +190,12 @@ asm_tests = {
     'invalid-arg-1': {},
     'invalid-arg-hi-1': {},
   },
+  'f80': {
+    'movif-movfi-1': {},
+    'fxaddxx-1': {},
+    'fxsubxx-1': {},
+    'fxmulxx-1': {},
+  },
 }
 
 foreach suite, tests : asm_tests