r600/llvm: Store inputs in function arguments

2 files changed, 120 insertions, 0 deletions

diff --git a/src/gallium/drivers/r600/r600_llvm.c b/src/gallium/drivers/r600/r600_llvm.c
index 5afe3cb51f7..a2ff0ec237d 100644
--- a/src/gallium/drivers/r600/r600_llvm.c
+++ b/src/gallium/drivers/r600/r600_llvm.c
@@ -77,6 +77,11 @@ static void llvm_load_system_value(
 	default: assert(!"unknown system value");
 	}
 
+#if HAVE_LLVM >= 0x0304
+	ctx->system_values[index] = LLVMBuildExtractElement(ctx->gallivm.builder,
+		LLVMGetParam(ctx->main_fn, 0), lp_build_const_int32(&(ctx->gallivm), chan),
+		"");
+#else
 	LLVMValueRef reg = lp_build_const_int32(
 			ctx->soa.bld_base.base.gallivm, chan);
 	ctx->system_values[index] = build_intrinsic(
@@ -84,8 +89,49 @@ static void llvm_load_system_value(
 			"llvm.R600.load.input",
 			ctx->soa.bld_base.base.elem_type, &reg, 1,
 			LLVMReadNoneAttribute);
+#endif
 }
 
+#if HAVE_LLVM >= 0x0304
+static LLVMValueRef
+llvm_load_input_vector(
+	struct radeon_llvm_context * ctx, unsigned location, unsigned ijregs,
+	boolean interp)
+{
+		LLVMTypeRef VecType;
+		LLVMValueRef Args[3] = {
+			lp_build_const_int32(&(ctx->gallivm), location)
+		};
+		unsigned ArgCount = 1;
+		if (interp) {
+			VecType = LLVMVectorType(ctx->soa.bld_base.base.elem_type, 2);
+			LLVMValueRef IJIndex = LLVMGetParam(ctx->main_fn, ijregs / 2);
+			Args[ArgCount++] = LLVMBuildExtractElement(ctx->gallivm.builder, IJIndex,
+				lp_build_const_int32(&(ctx->gallivm), 2 * (ijregs % 2)), "");
+			Args[ArgCount++] = LLVMBuildExtractElement(ctx->gallivm.builder, IJIndex,
+				lp_build_const_int32(&(ctx->gallivm), 2 * (ijregs % 2) + 1), "");
+			LLVMValueRef HalfVec[2] = {
+				build_intrinsic(ctx->gallivm.builder, "llvm.R600.interp.xy",
+					VecType, Args, ArgCount, LLVMReadNoneAttribute),
+				build_intrinsic(ctx->gallivm.builder, "llvm.R600.interp.zw",
+					VecType, Args, ArgCount, LLVMReadNoneAttribute)
+			};
+			LLVMValueRef MaskInputs[4] = {
+				lp_build_const_int32(&(ctx->gallivm), 0),
+				lp_build_const_int32(&(ctx->gallivm), 1),
+				lp_build_const_int32(&(ctx->gallivm), 2),
+				lp_build_const_int32(&(ctx->gallivm), 3)
+			};
+			LLVMValueRef Mask = LLVMConstVector(MaskInputs, 4);
+			return LLVMBuildShuffleVector(ctx->gallivm.builder, HalfVec[0], HalfVec[1],
+				Mask, "");
+		} else {
+			VecType = LLVMVectorType(ctx->soa.bld_base.base.elem_type, 4);
+			return build_intrinsic(ctx->gallivm.builder, "llvm.R600.interp.const",
+				VecType, Args, ArgCount, LLVMReadNoneAttribute);
+		}
+}
+#else
 static LLVMValueRef
 llvm_load_input_helper(
 	struct radeon_llvm_context * ctx,
@@ -110,7 +156,22 @@ llvm_load_input_helper(
 	return build_intrinsic(bb->gallivm->builder, intrinsic,
 		bb->elem_type, &arg[0], arg_count, LLVMReadNoneAttribute);
 }
+#endif
 
+#if HAVE_LLVM >= 0x0304
+static LLVMValueRef
+llvm_face_select_helper(
+	struct radeon_llvm_context * ctx,
+	LLVMValueRef face, LLVMValueRef front_color, LLVMValueRef back_color)
+{
+	const struct lp_build_context * bb = &ctx->soa.bld_base.base;
+	LLVMValueRef is_front = LLVMBuildFCmp(
+		bb->gallivm->builder, LLVMRealUGT, face,
+		lp_build_const_float(bb->gallivm, 0.0f),	"");
+	return LLVMBuildSelect(bb->gallivm->builder, is_front,
+		front_color, back_color, "");
+}
+#else
 static LLVMValueRef
 llvm_face_select_helper(
 	struct radeon_llvm_context * ctx,
@@ -124,6 +185,7 @@ llvm_face_select_helper(
 	return LLVMBuildSelect(bb->gallivm->builder, is_front,
 		front_color, back_color, "");
 }
+#endif
 
 static void llvm_load_input(
 	struct radeon_llvm_context * ctx,
@@ -132,11 +194,55 @@ static void llvm_load_input(
 {
 	const struct r600_shader_io * input = &ctx->r600_inputs[input_index];
 	unsigned chan;
+#if HAVE_LLVM < 0x0304
 	unsigned interp = 0;
 	int ij_index;
+#endif
 	int two_side = (ctx->two_side && input->name == TGSI_SEMANTIC_COLOR);
 	LLVMValueRef v;
+#if HAVE_LLVM >= 0x0304
+	boolean require_interp_intrinsic = ctx->chip_class >= EVERGREEN &&
+		ctx->type == TGSI_PROCESSOR_FRAGMENT;
+#endif
+
+#if HAVE_LLVM >= 0x0304
+	if (require_interp_intrinsic && input->spi_sid) {
+		v = llvm_load_input_vector(ctx, input->lds_pos, input->ij_index,
+			(input->interpolate > 0));
+	} else
+		v = LLVMGetParam(ctx->main_fn, input->gpr);
+
+	if (two_side) {
+		struct r600_shader_io * back_input =
+			&ctx->r600_inputs[input->back_color_input];
+		LLVMValueRef v2;
+		LLVMValueRef face = LLVMGetParam(ctx->main_fn, ctx->face_gpr);
+		face = LLVMBuildExtractElement(ctx->gallivm.builder, face,
+			lp_build_const_int32(&(ctx->gallivm), 0), "");
+
+		if (require_interp_intrinsic && back_input->spi_sid)
+			v2 = llvm_load_input_vector(ctx, back_input->lds_pos,
+				back_input->ij_index, (back_input->interpolate > 0));
+		else
+			v2 = LLVMGetParam(ctx->main_fn, back_input->gpr);
+		v = llvm_face_select_helper(ctx, face, v, v2);
+	}
+
+	for (chan = 0; chan < 4; chan++) {
+		unsigned soa_index = radeon_llvm_reg_index_soa(input_index, chan);
+
+		ctx->inputs[soa_index] = LLVMBuildExtractElement(ctx->gallivm.builder, v,
+			lp_build_const_int32(&(ctx->gallivm), chan), "");
 
+		if (input->name == TGSI_SEMANTIC_POSITION &&
+				ctx->type == TGSI_PROCESSOR_FRAGMENT && chan == 3) {
+		/* RCP for fragcoord.w */
+		ctx->inputs[soa_index] = LLVMBuildFDiv(ctx->gallivm.builder,
+				lp_build_const_float(&(ctx->gallivm), 1.0f),
+				ctx->inputs[soa_index], "");
+	}
+}
+#else
 	if (ctx->chip_class >= EVERGREEN && ctx->type == TGSI_PROCESSOR_FRAGMENT &&
 			input->spi_sid) {
 		interp = 1;
@@ -177,6 +283,7 @@ static void llvm_load_input(
 
 		ctx->inputs[soa_index] = v;
 	}
+#endif
 }
 
 static void llvm_emit_prologue(struct lp_build_tgsi_context * bld_base)
@@ -657,7 +764,19 @@ LLVMModuleRef r600_tgsi_llvm(
 	struct tgsi_shader_info shader_info;
 	struct lp_build_tgsi_context * bld_base = &ctx->soa.bld_base;
 	radeon_llvm_context_init(ctx);
+#if HAVE_LLVM >= 0x0304
+	LLVMTypeRef Arguments[32];
+	unsigned ArgumentsCount = 0;
+	for (unsigned i = 0; i < ctx->inputs_count; i++)
+		Arguments[ArgumentsCount++] = LLVMVectorType(bld_base->base.elem_type, 4);
+	radeon_llvm_create_func(ctx, Arguments, ArgumentsCount);
+	for (unsigned i = 0; i < ctx->inputs_count; i++) {
+		LLVMValueRef P = LLVMGetParam(ctx->main_fn, i);
+		LLVMAddAttribute(P, LLVMInRegAttribute);
+	}
+#else
 	radeon_llvm_create_func(ctx, NULL, 0);
+#endif
 	tgsi_scan_shader(tokens, &shader_info);
 
 	bld_base->info = &shader_info;
diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index aed21007384..1ea4ae6c056 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -1102,6 +1102,7 @@ static int r600_shader_from_tgsi(struct r600_screen *rscreen,
 		radeon_llvm_ctx.type = ctx.type;
 		radeon_llvm_ctx.two_side = shader->two_side;
 		radeon_llvm_ctx.face_gpr = ctx.face_gpr;
+		radeon_llvm_ctx.inputs_count = ctx.shader->ninput + 1;
 		radeon_llvm_ctx.r600_inputs = ctx.shader->input;
 		radeon_llvm_ctx.r600_outputs = ctx.shader->output;
 		radeon_llvm_ctx.color_buffer_count = max_color_exports;