[Mesa-dev] [PATCH v2 2/5] r600: factor out cayman_emit_unary_double_raw

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

We will use it for DDIV.
---
 src/gallium/drivers/r600/r600_shader.c | 62 +++++++++++++++++++++++-----------
 1 file changed, 42 insertions(+), 20 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 7d1452a..5c4bc91 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -4178,56 +4178,78 @@ static int egcm_double_to_int(struct r600_shader_ctx *ctx)
 		alu.last = 1;
 
 		r = r600_bytecode_add_alu(ctx->bc, &alu);
 		if (r)
 			return r;
 	}
 
 	return 0;
 }
 
-static int cayman_emit_double_instr(struct r600_shader_ctx *ctx)
+static int cayman_emit_unary_double_raw(struct r600_bytecode *bc,
+					unsigned op,
+					int dst_reg,
+					struct r600_shader_src *src,
+					bool abs)
 {
-	struct tgsi_full_instruction *inst = &ctx->parse.FullToken.FullInstruction;
-	int i, r;
 	struct r600_bytecode_alu alu;
-	int last_slot = 3;
-	int lasti = tgsi_last_instruction(inst->Dst[0].Register.WriteMask);
-	int t1 = ctx->temp_reg;
+	const int last_slot = 3;
+	int r;
 
 	/* these have to write the result to X/Y by the looks of it */
-	for (i = 0 ; i < last_slot; i++) {
+	for (int i = 0 ; i < last_slot; i++) {
 		memset(&alu, 0, sizeof(struct r600_bytecode_alu));
-		alu.op = ctx->inst_info->op;
-
-		/* should only be one src regs */
-		assert (inst->Instruction.NumSrcRegs == 1);
+		alu.op = op;
 
-		r600_bytecode_src(&alu.src[0], &ctx->src[0], 1);
-		r600_bytecode_src(&alu.src[1], &ctx->src[0], 0);
+		r600_bytecode_src(&alu.src[0], src, 1);
+		r600_bytecode_src(&alu.src[1], src, 0);
 
-		/* RSQ should take the absolute value of src */
-		if (ctx->parse.FullToken.FullInstruction.Instruction.Opcode == TGSI_OPCODE_DRSQ ||
-		    ctx->parse.FullToken.FullInstruction.Instruction.Opcode == TGSI_OPCODE_DSQRT) {
+		if (abs)
 			r600_bytecode_src_set_abs(&alu.src[1]);
-		}
-		alu.dst.sel = t1;
+
+		alu.dst.sel = dst_reg;
 		alu.dst.chan = i;
 		alu.dst.write = (i == 0 || i == 1);
 
-		if (ctx->bc->chip_class != CAYMAN || i == last_slot - 1)
+		if (bc->chip_class != CAYMAN || i == last_slot - 1)
 			alu.last = 1;
-		r = r600_bytecode_add_alu(ctx->bc, &alu);
+		r = r600_bytecode_add_alu(bc, &alu);
 		if (r)
 			return r;
 	}
 
+	return 0;
+}
+
+static int cayman_emit_double_instr(struct r600_shader_ctx *ctx)
+{
+	struct tgsi_full_instruction *inst = &ctx->parse.FullToken.FullInstruction;
+	int i, r;
+	struct r600_bytecode_alu alu;
+	int lasti = tgsi_last_instruction(inst->Dst[0].Register.WriteMask);
+	int t1 = ctx->temp_reg;
+
+	/* should only be one src regs */
+	assert(inst->Instruction.NumSrcRegs == 1);
+
+	/* only support one double at a time */
+	assert(inst->Dst[0].Register.WriteMask == TGSI_WRITEMASK_XY ||
+	       inst->Dst[0].Register.WriteMask == TGSI_WRITEMASK_ZW);
+
+	r = cayman_emit_unary_double_raw(
+		ctx->bc, ctx->inst_info->op, t1,
+		&ctx->src[0],
+		ctx->parse.FullToken.FullInstruction.Instruction.Opcode == TGSI_OPCODE_DRSQ ||
+		ctx->parse.FullToken.FullInstruction.Instruction.Opcode == TGSI_OPCODE_DSQRT);
+	if (r)
+		return r;
+
 	for (i = 0 ; i <= lasti; i++) {
 		if (!(inst->Dst[0].Register.WriteMask & (1 << i)))
 			continue;
 		memset(&alu, 0, sizeof(struct r600_bytecode_alu));
 		alu.op = ALU_OP1_MOV;
 		alu.src[0].sel = t1;
 		alu.src[0].chan = (i == 0 || i == 2) ? 0 : 1;
 		tgsi_dst(ctx, &inst->Dst[0], i, &alu.dst);
 		alu.dst.write = 1;
 		if (i == lasti)
-- 
2.7.4