On 10/28/2016 04:01 PM, Laurent Vivier wrote:
+ if (ext & 0x400) {
+ if (!m68k_feature(s->env, M68K_FEATURE_QUAD_MULDIV)) {
+ gen_exception(s, s->pc - 4, EXCP_UNSUPPORTED);
+ return;
+ }
+
+ SRC_EA(env, src1, OS_LONG, 0, NULL);
+
+ if (sign) {
+ tcg_gen_muls2_i32(DREG(ext, 12), DREG(ext, 0), src1, DREG(ext,
12));
+ } else {
+ tcg_gen_mulu2_i32(DREG(ext, 12), DREG(ext, 0), src1, DREG(ext,
12));
+ }
TCG will react badly if Dl == Dh, and thus the two outputs are the same.
This is undefined in the spec, but guests violating the spec shouldn't cause
qemu to crash.
I think you should compute this into N and Z and move the results (perhaps in
an order matching real hw?) to the data registers afterward.
r~
