# CHECK: r17 = mpy(r21, r31.h):<<1:rnd:sat
0x91 0xdf 0xf5 0xed
# CHECK: r17 = mpy(r21, r31.l):<<1:rnd:sat
+0x10 0xdf 0x15 0xe5
+# CHECK: r17:16 = mpy(r21, r31)
+0x10 0xdf 0x55 0xe5
+# CHECK: r17:16 = mpyu(r21, r31)
+0x10 0xdf 0x15 0xe7
+# CHECK: r17:16 += mpy(r21, r31)
+0x10 0xdf 0x35 0xe7
+# CHECK: r17:16 -= mpy(r21, r31)
+0x10 0xdf 0x55 0xe7
+# CHECK: r17:16 += mpyu(r21, r31)
+0x10 0xdf 0x75 0xe7
+# CHECK: r17:16 -= mpyu(r21, r31)