[Mesa-dev] [PATCH 1/2] r600g: introduce r600_bc_src_set_abs helper and fix LOG

[Vadim Girlin]

LOG instruction should use absolute values of source operand.

Signed-off-by: Vadim Girlin <vadimgirlin at gmail.com>
---
 src/gallium/drivers/r600/r600_shader.c |   26 ++++++++++++++++++--------
 1 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 5aad3e3..6dae692 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -939,6 +939,12 @@ static void r600_bc_src(struct r600_bc_alu_src *bc_src,
 	bc_src->value = shader_src->value[bc_src->chan];
 }
 
+static void r600_bc_src_set_abs(struct r600_bc_alu_src *bc_src)
+{
+	bc_src->abs = 1;
+	bc_src->neg = 0;
+}
+
 static void tgsi_dst(struct r600_shader_ctx *ctx,
 		     const struct tgsi_full_dst_register *tgsi_dst,
 		     unsigned swizzle,
@@ -998,9 +1004,7 @@ static int tgsi_op2_s(struct r600_shader_ctx *ctx, int swap)
 			alu.src[1].neg = 1;
 			break;
 		case TGSI_OPCODE_ABS:
-			alu.src[0].abs = 1;
-			if (alu.src[0].neg)
-			  alu.src[0].neg = 0;
+			r600_bc_src_set_abs(&alu.src[0]);
 			break;
 		default:
 			break;
@@ -1505,8 +1509,7 @@ static int tgsi_rsq(struct r600_shader_ctx *ctx)
 
 	for (i = 0; i < inst->Instruction.NumSrcRegs; i++) {
 		r600_bc_src(&alu.src[i], &ctx->src[i], 0);
-		alu.src[i].abs = 1;
-		alu.src[i].neg = 0;
+		r600_bc_src_set_abs(&alu.src[i]);
 	}
 	alu.dst.sel = ctx->temp_reg;
 	alu.dst.write = 1;
@@ -2489,7 +2492,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 	int r;
 	int i;
 
-	/* result.x = floor(log2(src)); */
+	/* result.x = floor(log2(|src|)); */
 	if (inst->Dst[0].Register.WriteMask & 1) {
 		if (ctx->bc->chiprev == CHIPREV_CAYMAN) {
 			for (i = 0; i < 3; i++) {
@@ -2497,6 +2500,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 
 				alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_LOG_IEEE);
 				r600_bc_src(&alu.src[0], &ctx->src[0], 0);
+				r600_bc_src_set_abs(&alu.src[0]);
 			
 				alu.dst.sel = ctx->temp_reg;
 				alu.dst.chan = i;
@@ -2514,6 +2518,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 
 			alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_LOG_IEEE);
 			r600_bc_src(&alu.src[0], &ctx->src[0], 0);
+			r600_bc_src_set_abs(&alu.src[0]);
 			
 			alu.dst.sel = ctx->temp_reg;
 			alu.dst.chan = 0;
@@ -2538,7 +2543,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 			return r;
 	}
 
-	/* result.y = src.x / (2 ^ floor(log2(src.x))); */
+	/* result.y = |src.x| / (2 ^ floor(log2(|src.x|))); */
 	if ((inst->Dst[0].Register.WriteMask >> 1) & 1) {
 
 		if (ctx->bc->chiprev == CHIPREV_CAYMAN) {
@@ -2547,6 +2552,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 
 				alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_LOG_IEEE);
 				r600_bc_src(&alu.src[0], &ctx->src[0], 0);
+				r600_bc_src_set_abs(&alu.src[0]);
 
 				alu.dst.sel = ctx->temp_reg;
 				alu.dst.chan = i;
@@ -2564,6 +2570,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 
 			alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_LOG_IEEE);
 			r600_bc_src(&alu.src[0], &ctx->src[0], 0);
+			r600_bc_src_set_abs(&alu.src[0]);
 
 			alu.dst.sel = ctx->temp_reg;
 			alu.dst.chan = 1;
@@ -2663,6 +2670,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 		alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_MUL);
 
 		r600_bc_src(&alu.src[0], &ctx->src[0], 0);
+		r600_bc_src_set_abs(&alu.src[0]);
 
 		alu.src[1].sel = ctx->temp_reg;
 		alu.src[1].chan = 1;
@@ -2677,7 +2685,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 			return r;
 	}
 
-	/* result.z = log2(src);*/
+	/* result.z = log2(|src|);*/
 	if ((inst->Dst[0].Register.WriteMask >> 2) & 1) {
 		if (ctx->bc->chiprev == CHIPREV_CAYMAN) {
 			for (i = 0; i < 3; i++) {
@@ -2685,6 +2693,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 
 				alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_LOG_IEEE);
 				r600_bc_src(&alu.src[0], &ctx->src[0], 0);
+				r600_bc_src_set_abs(&alu.src[0]);
 
 				alu.dst.sel = ctx->temp_reg;
 				if (i == 2)
@@ -2702,6 +2711,7 @@ static int tgsi_log(struct r600_shader_ctx *ctx)
 
 			alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_LOG_IEEE);
 			r600_bc_src(&alu.src[0], &ctx->src[0], 0);
+			r600_bc_src_set_abs(&alu.src[0]);
 
 			alu.dst.sel = ctx->temp_reg;
 			alu.dst.write = 1;
-- 
1.7.6