Merge pull request #14357 from kcbanner/llvm_byval_struct

llvm: implement Stdcall calling convention

1 files changed, 19 insertions, 0 deletions

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index abcb9b4060..3d31661b1e 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -10413,6 +10413,7 @@ fn firstParamSRet(fn_info: Type.Payload.Function.Data, target: std.Target) bool
             .riscv32, .riscv64 => return riscv_c_abi.classifyType(fn_info.return_type, target) == .memory,
             else => return false, // TODO investigate C ABI for other architectures
         },
+        .Stdcall => return !isScalar(fn_info.return_type),
         else => return false,
     }
 }
@@ -10568,6 +10569,13 @@ fn lowerFnRetTy(dg: *DeclGen, fn_info: Type.Payload.Function.Data) !*llvm.Type {
                 else => return dg.lowerType(fn_info.return_type),
             }
         },
+        .Stdcall => {
+            if (isScalar(fn_info.return_type)) {
+                return dg.lowerType(fn_info.return_type);
+            } else {
+                return dg.context.voidType();
+            }
+        },
         else => return dg.lowerType(fn_info.return_type),
     }
 }
@@ -10798,6 +10806,17 @@ const ParamTypeIterator = struct {
                     },
                 }
             },
+            .Stdcall => {
+                it.zig_index += 1;
+                it.llvm_index += 1;
+
+                if (isScalar(ty)) {
+                    return .byval;
+                } else {
+                    it.byval_attr = true;
+                    return .byref;
+                }
+            },
             else => {
                 it.zig_index += 1;
                 it.llvm_index += 1;