In case we've reading/writing R0.
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4458>
}
/* When port 3 isn't used, we have to set it to port 2, and vice versa,
- * or we an INSTR_INVALID_ENC is raised. The reason is unknown. */
+ * or INSTR_INVALID_ENC is raised. The reason is unknown. */
- if (!regs.port[3])
+ bool has_port2 = regs.write_fma || regs.write_add;
+ bool has_port3 = regs.read_port3 || (regs.write_fma && regs.write_add);
+
+ if (!has_port3)
regs.port[3] = regs.port[2];
- if (!regs.port[2])
+ if (!has_port2)
regs.port[2] = regs.port[3];
s.reg3 = regs.port[3];