[Mesa-dev] [PATCH 7/7] Revert "r600g: set round_mode to truncate and get rid of tgsi_f2i on evergreen"

[Vadim Girlin]

This reverts commit 60bf0f05b472e66bf1175fcec7a274dab6f7e2a3.

It seems round_mode behaves differently in some cases depending on  the
instruction/slot. Reverting it for now.

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=50232

Signed-off-by: Vadim Girlin <vadimgirlin at gmail.com>
---
 src/gallium/drivers/r600/evergreen_state.c |    8 ++---
 src/gallium/drivers/r600/r600_shader.c     |   54 ++++++++++++++++++++++++++--
 2 files changed, 56 insertions(+), 6 deletions(-)

diff --git a/src/gallium/drivers/r600/evergreen_state.c b/src/gallium/drivers/r600/evergreen_state.c
index c28eeab..ec0afe5 100644
--- a/src/gallium/drivers/r600/evergreen_state.c
+++ b/src/gallium/drivers/r600/evergreen_state.c
@@ -2027,8 +2027,8 @@ static void cayman_init_atom_start_cs(struct r600_context *rctx)
 	r600_store_value(cb, 0); /* R_028030_PA_SC_SCREEN_SCISSOR_TL */
 	r600_store_value(cb, S_028034_BR_X(16384) | S_028034_BR_Y(16384)); /* R_028034_PA_SC_SCREEN_SCISSOR_BR */
 
-	r600_store_context_reg(cb, R_028848_SQ_PGM_RESOURCES_2_PS, S_028848_SINGLE_ROUND(V_SQ_ROUND_TO_ZERO));
-	r600_store_context_reg(cb, R_028864_SQ_PGM_RESOURCES_2_VS, S_028864_SINGLE_ROUND(V_SQ_ROUND_TO_ZERO));
+	r600_store_context_reg(cb, R_028848_SQ_PGM_RESOURCES_2_PS, S_028848_SINGLE_ROUND(V_SQ_ROUND_NEAREST_EVEN));
+	r600_store_context_reg(cb, R_028864_SQ_PGM_RESOURCES_2_VS, S_028864_SINGLE_ROUND(V_SQ_ROUND_NEAREST_EVEN));
 	r600_store_context_reg(cb, R_0288A8_SQ_PGM_RESOURCES_FS, 0);
 
 	r600_store_context_reg(cb, R_028354_SX_SURFACE_SYNC, S_028354_SURFACE_SYNC_MASK(0xf));
@@ -2512,8 +2512,8 @@ void evergreen_init_atom_start_cs(struct r600_context *rctx)
 	r600_store_value(cb, 0); /* R_028030_PA_SC_SCREEN_SCISSOR_TL */
 	r600_store_value(cb, S_028034_BR_X(16384) | S_028034_BR_Y(16384)); /* R_028034_PA_SC_SCREEN_SCISSOR_BR */
 
-	r600_store_context_reg(cb, R_028848_SQ_PGM_RESOURCES_2_PS, S_028848_SINGLE_ROUND(V_SQ_ROUND_TO_ZERO));
-	r600_store_context_reg(cb, R_028864_SQ_PGM_RESOURCES_2_VS, S_028864_SINGLE_ROUND(V_SQ_ROUND_TO_ZERO));
+	r600_store_context_reg(cb, R_028848_SQ_PGM_RESOURCES_2_PS, S_028848_SINGLE_ROUND(V_SQ_ROUND_NEAREST_EVEN));
+	r600_store_context_reg(cb, R_028864_SQ_PGM_RESOURCES_2_VS, S_028864_SINGLE_ROUND(V_SQ_ROUND_NEAREST_EVEN));
 	r600_store_context_reg(cb, R_0288A8_SQ_PGM_RESOURCES_FS, 0);
 
 	r600_store_context_reg(cb, R_028354_SX_SURFACE_SYNC, S_028354_SURFACE_SYNC_MASK(0xf));
diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index cd78104..dc208b9 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -3306,6 +3306,56 @@ static int tgsi_imod(struct r600_shader_ctx *ctx)
 	return tgsi_divmod(ctx, 1, 1);
 }
 
+
+static int tgsi_f2i(struct r600_shader_ctx *ctx)
+{
+	struct tgsi_full_instruction *inst = &ctx->parse.FullToken.FullInstruction;
+	struct r600_bytecode_alu alu;
+	int i, r;
+	unsigned write_mask = inst->Dst[0].Register.WriteMask;
+	int last_inst = tgsi_last_instruction(write_mask);
+
+	for (i = 0; i < 4; i++) {
+		if (!(write_mask & (1<<i)))
+			continue;
+
+		memset(&alu, 0, sizeof(struct r600_bytecode_alu));
+		alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_TRUNC);
+
+		alu.dst.sel = ctx->temp_reg;
+		alu.dst.chan = i;
+		alu.dst.write = 1;
+
+		r600_bytecode_src(&alu.src[0], &ctx->src[0], i);
+		if (i == last_inst)
+			alu.last = 1;
+		r = r600_bytecode_add_alu(ctx->bc, &alu);
+		if (r)
+			return r;
+	}
+
+	for (i = 0; i < 4; i++) {
+		if (!(write_mask & (1<<i)))
+			continue;
+
+		memset(&alu, 0, sizeof(struct r600_bytecode_alu));
+		alu.inst = ctx->inst_info->r600_opcode;
+
+		tgsi_dst(ctx, &inst->Dst[0], i, &alu.dst);
+
+		alu.src[0].sel = ctx->temp_reg;
+		alu.src[0].chan = i;
+
+		if (i == last_inst)
+			alu.last = 1;
+		r = r600_bytecode_add_alu(ctx->bc, &alu);
+		if (r)
+			return r;
+	}
+
+	return 0;
+}
+
 static int tgsi_iabs(struct r600_shader_ctx *ctx)
 {
 	struct tgsi_full_instruction *inst = &ctx->parse.FullToken.FullInstruction;
@@ -5368,7 +5418,7 @@ static struct r600_shader_tgsi_instruction eg_shader_tgsi_instruction[] = {
 	{TGSI_OPCODE_END,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_NOP, tgsi_end},  /* aka HALT */
 	/* gap */
 	{118,			0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_NOP, tgsi_unsupported},
-	{TGSI_OPCODE_F2I,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_FLT_TO_INT, tgsi_op2},
+	{TGSI_OPCODE_F2I,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_FLT_TO_INT, tgsi_f2i},
 	{TGSI_OPCODE_IDIV,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_NOP, tgsi_idiv},
 	{TGSI_OPCODE_IMAX,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_MAX_INT, tgsi_op2},
 	{TGSI_OPCODE_IMIN,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_MIN_INT, tgsi_op2},
@@ -5376,7 +5426,7 @@ static struct r600_shader_tgsi_instruction eg_shader_tgsi_instruction[] = {
 	{TGSI_OPCODE_ISGE,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_SETGE_INT, tgsi_op2},
 	{TGSI_OPCODE_ISHR,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_ASHR_INT, tgsi_op2},
 	{TGSI_OPCODE_ISLT,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_SETGT_INT, tgsi_op2_swap},
-	{TGSI_OPCODE_F2U,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_FLT_TO_UINT, tgsi_op2_trans},
+	{TGSI_OPCODE_F2U,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_FLT_TO_UINT, tgsi_f2i},
 	{TGSI_OPCODE_U2F,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_UINT_TO_FLT, tgsi_op2_trans},
 	{TGSI_OPCODE_UADD,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_ADD_INT, tgsi_op2},
 	{TGSI_OPCODE_UDIV,	0, EG_V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_NOP, tgsi_udiv},
-- 
1.7.10.2