i965/blorp: Emit MADs.

Low hanging fruit: cuts a couple of instructions.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/src/mesa/drivers/dri/i965/brw_blorp_blit.cpp b/src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
index fc111ae..5c936cf 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
+++ b/src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
@@ -1255,10 +1255,8 @@ brw_blorp_blit_program::translate_dst_to_src()
    emit_mov(Xp_f, X);
    emit_mov(Yp_f, Y);
    /* Scale and offset */
-   emit_mul(X_f, Xp_f, x_transform.multiplier);
-   emit_mul(Y_f, Yp_f, y_transform.multiplier);
-   emit_add(X_f, X_f, x_transform.offset);
-   emit_add(Y_f, Y_f, y_transform.offset);
+   emit_mad(X_f, x_transform.offset, Xp_f, x_transform.multiplier);
+   emit_mad(Y_f, y_transform.offset, Yp_f, y_transform.multiplier);
    if (key->blit_scaled && key->blend) {
       /* Translate coordinates to lay out the samples in a rectangular  grid
        * roughly corresponding to sample locations.

diff --git a/src/mesa/drivers/dri/i965/brw_blorp_blit_eu.h b/src/mesa/drivers/dri/i965/brw_blorp_blit_eu.h
index bfad422..8e44eb4 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_blorp_blit_eu.h
+++ b/src/mesa/drivers/dri/i965/brw_blorp_blit_eu.h
@@ -85,6 +85,15 @@ protected:
          new (mem_ctx) fs_inst(BRW_OPCODE_LRP, 16, dst, src1, src2, src3));
    }
 
+   inline void emit_mad(const struct brw_reg &dst,
+                        const struct brw_reg &src1,
+                        const struct brw_reg &src2,
+                        const struct brw_reg &src3)
+   {
+      insts.push_tail(
+         new (mem_ctx) fs_inst(BRW_OPCODE_MAD, 16, dst, src1, src2, src3));
+   }
+
    inline void emit_min(const struct brw_reg& dst,
                         const struct brw_reg& src1,
                         const struct brw_reg& src2)