[Freedreno] [PATCH v2 8/8] freedreno: a2xx: Implement DP2 instruction

[Wladimir J. van der Laan]

Use DOT2ADDv instruction with 0.0f constant add.

Signed-off-by: Wladimir J. van der Laan <laanwj at gmail.com>
---
 src/gallium/drivers/freedreno/a2xx/fd2_compiler.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/gallium/drivers/freedreno/a2xx/fd2_compiler.c b/src/gallium/drivers/freedreno/a2xx/fd2_compiler.c
index 52f0aba..ce0b33a 100644
--- a/src/gallium/drivers/freedreno/a2xx/fd2_compiler.c
+++ b/src/gallium/drivers/freedreno/a2xx/fd2_compiler.c
@@ -987,6 +987,24 @@ translate_trig(struct fd2_compile_context *ctx,
 	add_src_reg(ctx, instr, &tmp_src);
 }
 
+static void
+translate_dp2(struct fd2_compile_context *ctx,
+		struct tgsi_full_instruction *inst,
+		unsigned opc)
+{
+        struct tgsi_src_register tmp_const;
+        struct ir2_instruction *instr;
+        /* DP2ADD c,a,b -> dot2(a,b) + c */
+        /* for c we use the constant 0.0 */
+        instr = ir2_instr_create_alu(next_exec_cf(ctx), DOT2ADDv, ~0);
+        get_immediate(ctx, &tmp_const, fui(0.0f));
+        add_dst_reg(ctx, instr, &inst->Dst[0].Register);
+        add_src_reg(ctx, instr, &tmp_const);
+        add_src_reg(ctx, instr, &inst->Src[0].Register);
+        add_src_reg(ctx, instr, &inst->Src[1].Register);
+        add_vector_clamp(inst, instr);
+}
+
 /*
  * Main part of compiler/translator:
  */
@@ -1054,6 +1072,9 @@ translate_instruction(struct fd2_compile_context *ctx,
 		instr = ir2_instr_create_alu(cf, ADDv, ~0);
 		add_regs_vector_2(ctx, inst, instr);
 		break;
+	case TGSI_OPCODE_DP2:
+		translate_dp2(ctx, inst, opc);
+		break;
 	case TGSI_OPCODE_DP3:
 		instr = ir2_instr_create_alu(cf, DOT3v, ~0);
 		add_regs_vector_2(ctx, inst, instr);
-- 
2.7.4