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fix wrong value for clz, ctz at compile time

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closes #418

also make clz, ctz return smaller integer bit widths
and use smaller integer bit widths for enum tag types
This commit is contained in:
Andrew Kelley
2017-08-17 17:14:35 -04:00
parent 6a98bf3dba
commit 0d117bb0a9
6 changed files with 30 additions and 20 deletions
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13
src/codegen.cpp
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@@ -2440,25 +2440,27 @@ static LLVMValueRef get_int_builtin_fn(CodeGen *g, TypeTableEntry *int_type, Bui
}
static LLVMValueRef ir_render_clz(CodeGen *g, IrExecutable *executable, IrInstructionClz *instruction) {
TypeTableEntry *int_type = instruction->base.value.type;
TypeTableEntry *int_type = instruction->value->value.type;
LLVMValueRef fn_val = get_int_builtin_fn(g, int_type, BuiltinFnIdClz);
LLVMValueRef operand = ir_llvm_value(g, instruction->value);
LLVMValueRef params[] {
operand,
LLVMConstNull(LLVMInt1Type()),
};
return LLVMBuildCall(g->builder, fn_val, params, 2, "");
LLVMValueRef wrong_size_int = LLVMBuildCall(g->builder, fn_val, params, 2, "");
return gen_widen_or_shorten(g, false, int_type, instruction->base.value.type, wrong_size_int);
}
static LLVMValueRef ir_render_ctz(CodeGen *g, IrExecutable *executable, IrInstructionCtz *instruction) {
TypeTableEntry *int_type = instruction->base.value.type;
TypeTableEntry *int_type = instruction->value->value.type;
LLVMValueRef fn_val = get_int_builtin_fn(g, int_type, BuiltinFnIdCtz);
LLVMValueRef operand = ir_llvm_value(g, instruction->value);
LLVMValueRef params[] {
operand,
LLVMConstNull(LLVMInt1Type()),
};
return LLVMBuildCall(g->builder, fn_val, params, 2, "");
LLVMValueRef wrong_size_int = LLVMBuildCall(g->builder, fn_val, params, 2, "");
return gen_widen_or_shorten(g, false, int_type, instruction->base.value.type, wrong_size_int);
}
static LLVMValueRef ir_render_switch_br(CodeGen *g, IrExecutable *executable, IrInstructionSwitchBr *instruction) {
@@ -2545,7 +2547,8 @@ static LLVMValueRef ir_render_enum_tag_name(CodeGen *g, IrExecutable *executable
LLVMValueRef indices[] = {
LLVMConstNull(g->builtin_types.entry_usize->type_ref),
enum_tag_value,
gen_widen_or_shorten(g, false, enum_tag_type->data.enum_tag.int_type,
g->builtin_types.entry_usize, enum_tag_value),
};
return LLVMBuildInBoundsGEP(g->builder, enum_tag_type->data.enum_tag.name_table, indices, 2, "");
}