[Mesa-dev] [PATCH 35/53] r600/shader: add a utility function to do single slot arithmatic

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

This utility is to be used to do things like integer adds and
multiplies to be used in calculating the LDS offsets etc.

It handles CAYMAN MULLO differences as well.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 src/gallium/drivers/r600/r600_shader.c | 56 ++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 4f204c9..e335d29 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -666,6 +666,62 @@ static int select_twoside_color(struct r600_shader_ctx *ctx, int front, int back
 	return 0;
 }
 
+/* execute a single slot ALU calculation */
+static int single_alu_op2(struct r600_shader_ctx *ctx, int op,
+			  int dst_sel, int dst_chan,
+			  int src0_sel, unsigned src0_chan_val,
+			  int src1_sel, unsigned src1_chan_val)
+{
+	struct r600_bytecode_alu alu;
+	int r, i;
+
+	if (ctx->bc->chip_class == CAYMAN && op == ALU_OP2_MULLO_INT) {
+		for (i = 0; i < 4; i++) {
+			memset(&alu, 0, sizeof(struct r600_bytecode_alu));
+			alu.op = op;
+			alu.src[0].sel = src0_sel;
+			if (src0_sel == V_SQ_ALU_SRC_LITERAL)
+				alu.src[0].value = src0_chan_val;
+			else
+				alu.src[0].chan = src0_chan_val;
+			alu.src[1].sel = src1_sel;
+			if (src1_sel == V_SQ_ALU_SRC_LITERAL)
+				alu.src[1].value = src1_chan_val;
+			else
+				alu.src[1].chan = src1_chan_val;
+			alu.dst.sel = dst_sel;
+			alu.dst.chan = i;
+			alu.dst.write = i == dst_chan;
+			alu.last = (i == 3);
+			r = r600_bytecode_add_alu(ctx->bc, &alu);
+			if (r)
+				return r;
+		}
+		return 0;
+	}
+
+	memset(&alu, 0, sizeof(struct r600_bytecode_alu));
+	alu.op = op;
+	alu.src[0].sel = src0_sel;
+	if (src0_sel == V_SQ_ALU_SRC_LITERAL)
+		alu.src[0].value = src0_chan_val;
+	else
+		alu.src[0].chan = src0_chan_val;
+	alu.src[1].sel = src1_sel;
+	if (src1_sel == V_SQ_ALU_SRC_LITERAL)
+		alu.src[1].value = src1_chan_val;
+	else
+		alu.src[1].chan = src1_chan_val;
+	alu.dst.sel = dst_sel;
+	alu.dst.chan = dst_chan;
+	alu.dst.write = 1;
+	alu.last = 1;
+	r = r600_bytecode_add_alu(ctx->bc, &alu);
+	if (r)
+		return r;
+	return 0;
+}
+
 static inline int get_address_file_reg(struct r600_shader_ctx *ctx, int index)
 {
 	return index > 0 ? ctx->bc->index_reg[index - 1] : ctx->bc->ar_reg;
-- 
2.5.0