ac: don't use byval LLVM qualifier in shaders

shader-db doesn't show any regression and 32-bit pointers with byval
are declared as VGPRs for some reason.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/amd/common/ac_llvm_helper.cpp

@@ -60,8 +60,7 @@ bool ac_is_sgpr_param(LLVMValueRef arg)
 	llvm::Argument *A = llvm::unwrap<llvm::Argument>(arg);
 	llvm::AttributeList AS = A->getParent()->getAttributes();
 	unsigned ArgNo = A->getArgNo();
-	return AS.hasAttribute(ArgNo + 1, llvm::Attribute::ByVal) ||
-	       AS.hasAttribute(ArgNo + 1, llvm::Attribute::InReg);
+	return AS.hasAttribute(ArgNo + 1, llvm::Attribute::InReg);
 }
 
 LLVMValueRef ac_llvm_get_called_value(LLVMValueRef call)

src/amd/common/ac_llvm_util.c

@@ -152,7 +152,6 @@ static LLVMAttribute ac_attr_to_llvm_attr(enum ac_func_attr attr)
 {
    switch (attr) {
    case AC_FUNC_ATTR_ALWAYSINLINE: return LLVMAlwaysInlineAttribute;
-   case AC_FUNC_ATTR_BYVAL: return LLVMByValAttribute;
    case AC_FUNC_ATTR_INREG: return LLVMInRegAttribute;
    case AC_FUNC_ATTR_NOALIAS: return LLVMNoAliasAttribute;
    case AC_FUNC_ATTR_NOUNWIND: return LLVMNoUnwindAttribute;
@@ -170,7 +169,6 @@ static const char *attr_to_str(enum ac_func_attr attr)
 {
    switch (attr) {
    case AC_FUNC_ATTR_ALWAYSINLINE: return "alwaysinline";
-   case AC_FUNC_ATTR_BYVAL: return "byval";
    case AC_FUNC_ATTR_INREG: return "inreg";
    case AC_FUNC_ATTR_NOALIAS: return "noalias";
    case AC_FUNC_ATTR_NOUNWIND: return "nounwind";

src/amd/common/ac_llvm_util.h

@@ -37,7 +37,6 @@ extern "C" {
 
 enum ac_func_attr {
 	AC_FUNC_ATTR_ALWAYSINLINE = (1 << 0),
-	AC_FUNC_ATTR_BYVAL        = (1 << 1),
 	AC_FUNC_ATTR_INREG        = (1 << 2),
 	AC_FUNC_ATTR_NOALIAS      = (1 << 3),
 	AC_FUNC_ATTR_NOUNWIND     = (1 << 4),

src/amd/common/ac_nir_to_llvm.c

@@ -323,15 +323,13 @@ create_llvm_function(LLVMContextRef ctx, LLVMModuleRef module,
 
 	LLVMSetFunctionCallConv(main_function, RADEON_LLVM_AMDGPU_CS);
 	for (unsigned i = 0; i < args->sgpr_count; ++i) {
+		ac_add_function_attr(ctx, main_function, i + 1, AC_FUNC_ATTR_INREG);
+
 		if (args->array_params_mask & (1 << i)) {
 			LLVMValueRef P = LLVMGetParam(main_function, i);
-			ac_add_function_attr(ctx, main_function, i + 1, AC_FUNC_ATTR_BYVAL);
 			ac_add_function_attr(ctx, main_function, i + 1, AC_FUNC_ATTR_NOALIAS);
 			ac_add_attr_dereferenceable(P, UINT64_MAX);
 		}
-		else {
-			ac_add_function_attr(ctx, main_function, i + 1, AC_FUNC_ATTR_INREG);
-		}
 	}
 
 	if (max_workgroup_size) {

src/gallium/auxiliary/gallivm/lp_bld_intr.c

@@ -126,7 +126,6 @@ static LLVMAttribute lp_attr_to_llvm_attr(enum lp_func_attr attr)
 {
    switch (attr) {
    case LP_FUNC_ATTR_ALWAYSINLINE: return LLVMAlwaysInlineAttribute;
-   case LP_FUNC_ATTR_BYVAL: return LLVMByValAttribute;
    case LP_FUNC_ATTR_INREG: return LLVMInRegAttribute;
    case LP_FUNC_ATTR_NOALIAS: return LLVMNoAliasAttribute;
    case LP_FUNC_ATTR_NOUNWIND: return LLVMNoUnwindAttribute;
@@ -144,7 +143,6 @@ static const char *attr_to_str(enum lp_func_attr attr)
 {
    switch (attr) {
    case LP_FUNC_ATTR_ALWAYSINLINE: return "alwaysinline";
-   case LP_FUNC_ATTR_BYVAL: return "byval";
    case LP_FUNC_ATTR_INREG: return "inreg";
    case LP_FUNC_ATTR_NOALIAS: return "noalias";
    case LP_FUNC_ATTR_NOUNWIND: return "nounwind";

src/gallium/auxiliary/gallivm/lp_bld_intr.h

@@ -48,7 +48,6 @@
 
 enum lp_func_attr {
    LP_FUNC_ATTR_ALWAYSINLINE = (1 << 0),
-   LP_FUNC_ATTR_BYVAL        = (1 << 1),
    LP_FUNC_ATTR_INREG        = (1 << 2),
    LP_FUNC_ATTR_NOALIAS      = (1 << 3),
    LP_FUNC_ATTR_NOUNWIND     = (1 << 4),

src/gallium/drivers/radeonsi/si_shader.c

@@ -4452,18 +4452,18 @@ static void si_create_function(struct si_shader_context *ctx,
 		LLVMValueRef P = LLVMGetParam(ctx->main_fn, i);
 
 		/* The combination of:
-		 * - ByVal
+		 * - noalias
 		 * - dereferenceable
 		 * - invariant.load
 		 * allows the optimization passes to move loads and reduces
 		 * SGPR spilling significantly.
 		 */
+		lp_add_function_attr(ctx->main_fn, i + 1, LP_FUNC_ATTR_INREG);
+
 		if (LLVMGetTypeKind(LLVMTypeOf(P)) == LLVMPointerTypeKind) {
-			lp_add_function_attr(ctx->main_fn, i + 1, LP_FUNC_ATTR_BYVAL);
 			lp_add_function_attr(ctx->main_fn, i + 1, LP_FUNC_ATTR_NOALIAS);
 			ac_add_attr_dereferenceable(P, UINT64_MAX);
-		} else
-			lp_add_function_attr(ctx->main_fn, i + 1, LP_FUNC_ATTR_INREG);
+		}
 	}
 
 	for (i = 0; i < fninfo->num_params; ++i) {
@@ -6595,15 +6595,8 @@ static void si_build_wrapper_function(struct si_shader_context *ctx,
 			param_size = ac_get_type_size(param_type) / 4;
 			is_sgpr = ac_is_sgpr_param(param);
 
-			if (is_sgpr) {
-#if HAVE_LLVM < 0x0400
-				LLVMRemoveAttribute(param, LLVMByValAttribute);
-#else
-				unsigned kind_id = LLVMGetEnumAttributeKindForName("byval", 5);
-				LLVMRemoveEnumAttributeAtIndex(parts[part], param_idx + 1, kind_id);
-#endif
+			if (is_sgpr)
 				lp_add_function_attr(parts[part], param_idx + 1, LP_FUNC_ATTR_INREG);
-			}
 
 			assert(out_idx + param_size <= (is_sgpr ? num_out_sgpr : num_out));
 			assert(is_sgpr || out_idx >= num_out_sgpr);