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elide redundant safety check when switching on tagged unions

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Andrew Kelley
2019-06-22 16:18:42 -04:00
parent 3c4b255a3c
commit 86f362ce8e
4 changed files with 10 additions and 8 deletions
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src/codegen.cpp
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@@ -3890,7 +3890,7 @@ static LLVMValueRef ir_render_union_field_ptr(CodeGen *g, IrExecutable *executab
LLVMValueRef tag_value = bigint_to_llvm_const(get_llvm_type(g, union_type->data.unionation.tag_type),
&field->enum_field->value);
gen_store_untyped(g, tag_value, tag_field_ptr, 0, false);
} else if (ir_want_runtime_safety(g, &instruction->base)) {
} else if (instruction->safety_check_on && ir_want_runtime_safety(g, &instruction->base)) {
LLVMValueRef tag_field_ptr = LLVMBuildStructGEP(g->builder, union_ptr, union_type->data.unionation.gen_tag_index, "");
LLVMValueRef tag_value = gen_load_untyped(g, tag_field_ptr, 0, false, "");