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stage2: improve handling of 0 bit types

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* Sema: zirAtomicLoad handles 0-bit types correctly
 * LLVM backend: when lowering function types, elide parameters
   with 0-bit types.
 * Type: abiSize handles u0/i0 correctly
This commit is contained in:
Andrew Kelley
2021-09-20 16:48:42 -07:00
parent 4b2d7a9c67
commit abc30f7948
6 changed files with 39 additions and 35 deletions
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16
src/codegen/llvm.zig
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@@ -541,17 +541,21 @@ pub const DeclGen = struct {
defer self.gpa.free(fn_param_types);
zig_fn_type.fnParamTypes(fn_param_types);
const llvm_param = try self.gpa.alloc(*const llvm.Type, fn_param_len);
defer self.gpa.free(llvm_param);
const llvm_param_buffer = try self.gpa.alloc(*const llvm.Type, fn_param_len);
defer self.gpa.free(llvm_param_buffer);
for (fn_param_types) |fn_param, i| {
llvm_param[i] = try self.llvmType(fn_param);
var llvm_params_len: c_uint = 0;
for (fn_param_types) |fn_param| {
if (fn_param.hasCodeGenBits()) {
llvm_param_buffer[llvm_params_len] = try self.llvmType(fn_param);
llvm_params_len += 1;
}
}
const fn_type = llvm.functionType(
try self.llvmType(return_type),
llvm_param.ptr,
@intCast(c_uint, fn_param_len),
llvm_param_buffer.ptr,
llvm_params_len,
.False,
);
const llvm_fn = self.llvmModule().addFunction(decl.name, fn_type);