i965/vec4: Implement equals() method for dst_reg too.

Reviewed-by: Matt Turner <mattst88@gmail.com>

src/mesa/drivers/dri/i965/brw_ir_vec4.h

@@ -117,6 +117,8 @@ public:
 
    explicit dst_reg(src_reg reg);
 
+   bool equals(const dst_reg &r) const;
+
    int writemask; /**< Bitfield of WRITEMASK_[XYZW] */
 
    src_reg *reladdr;

src/mesa/drivers/dri/i965/brw_vec4.cpp

@@ -234,6 +234,22 @@ dst_reg::dst_reg(src_reg reg)
    this->fixed_hw_reg = reg.fixed_hw_reg;
 }
 
+bool
+dst_reg::equals(const dst_reg &r) const
+{
+   return (file == r.file &&
+           reg == r.reg &&
+           reg_offset == r.reg_offset &&
+           type == r.type &&
+           negate == r.negate &&
+           abs == r.abs &&
+           writemask == r.writemask &&
+           (reladdr == r.reladdr ||
+            (reladdr && r.reladdr && reladdr->equals(*r.reladdr))) &&
+           memcmp(&fixed_hw_reg, &r.fixed_hw_reg,
+                  sizeof(fixed_hw_reg)) == 0);
+}
+
 bool
 vec4_instruction::is_send_from_grf()
 {