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codegen does signed, unsigned, and floating point math

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This commit is contained in:
Andrew Kelley 2015-12-08 12:25:30 -07:00
parent 3e06ed0e8c
commit 2f0e4e9cb2
4 changed files with 106 additions and 15 deletions
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101
src/codegen.cpp
View file

@ -210,6 +210,10 @@ static LLVMValueRef gen_arithmetic_bin_op_expr(CodeGen *g, AstNode *node) {
LLVMValueRef val1 = gen_expr(g, node->data.bin_op_expr.op1);
LLVMValueRef val2 = gen_expr(g, node->data.bin_op_expr.op2);
TypeTableEntry *op1_type = get_expr_type(node->data.bin_op_expr.op1);
TypeTableEntry *op2_type = get_expr_type(node->data.bin_op_expr.op2);
assert(op1_type == op2_type);
switch (node->data.bin_op_expr.bin_op) {
case BinOpTypeBinOr:
add_debug_source_node(g, node);
@ -224,29 +228,51 @@ static LLVMValueRef gen_arithmetic_bin_op_expr(CodeGen *g, AstNode *node) {
add_debug_source_node(g, node);
return LLVMBuildShl(g->builder, val1, val2, "");
case BinOpTypeBitShiftRight:
// TODO implement type system so that we know whether to do
// logical or arithmetic shifting here.
// signed -> arithmetic, unsigned -> logical
add_debug_source_node(g, node);
return LLVMBuildLShr(g->builder, val1, val2, "");
if (op1_type->is_signed_int) {
return LLVMBuildAShr(g->builder, val1, val2, "");
} else {
return LLVMBuildLShr(g->builder, val1, val2, "");
}
case BinOpTypeAdd:
add_debug_source_node(g, node);
return LLVMBuildAdd(g->builder, val1, val2, "");
if (op1_type->is_float) {
return LLVMBuildFAdd(g->builder, val1, val2, "");
} else {
return LLVMBuildNSWAdd(g->builder, val1, val2, "");
}
case BinOpTypeSub:
add_debug_source_node(g, node);
return LLVMBuildSub(g->builder, val1, val2, "");
if (op1_type->is_float) {
return LLVMBuildFSub(g->builder, val1, val2, "");
} else {
return LLVMBuildNSWSub(g->builder, val1, val2, "");
}
case BinOpTypeMult:
// TODO types so we know float vs int
add_debug_source_node(g, node);
return LLVMBuildMul(g->builder, val1, val2, "");
if (op1_type->is_float) {
return LLVMBuildFMul(g->builder, val1, val2, "");
} else {
return LLVMBuildNSWMul(g->builder, val1, val2, "");
}
case BinOpTypeDiv:
// TODO types so we know float vs int and signed vs unsigned
add_debug_source_node(g, node);
return LLVMBuildSDiv(g->builder, val1, val2, "");
if (op1_type->is_float) {
return LLVMBuildFDiv(g->builder, val1, val2, "");
} else if (op1_type->is_signed_int) {
return LLVMBuildSDiv(g->builder, val1, val2, "");
} else {
return LLVMBuildUDiv(g->builder, val1, val2, "");
}
case BinOpTypeMod:
// TODO types so we know float vs int and signed vs unsigned
add_debug_source_node(g, node);
return LLVMBuildSRem(g->builder, val1, val2, "");
if (op1_type->is_float) {
return LLVMBuildFRem(g->builder, val1, val2, "");
} else if (op1_type->is_signed_int) {
return LLVMBuildSRem(g->builder, val1, val2, "");
} else {
return LLVMBuildURem(g->builder, val1, val2, "");
}
case BinOpTypeBoolOr:
case BinOpTypeBoolAnd:
case BinOpTypeCmpEq:
@ -281,16 +307,43 @@ static LLVMIntPredicate cmp_op_to_int_predicate(BinOpType cmp_op, bool is_signed
}
}
static LLVMRealPredicate cmp_op_to_real_predicate(BinOpType cmp_op) {
switch (cmp_op) {
case BinOpTypeCmpEq:
return LLVMRealOEQ;
case BinOpTypeCmpNotEq:
return LLVMRealONE;
case BinOpTypeCmpLessThan:
return LLVMRealOLT;
case BinOpTypeCmpGreaterThan:
return LLVMRealOGT;
case BinOpTypeCmpLessOrEq:
return LLVMRealOLE;
case BinOpTypeCmpGreaterOrEq:
return LLVMRealOGE;
default:
zig_unreachable();
}
}
static LLVMValueRef gen_cmp_expr(CodeGen *g, AstNode *node) {
assert(node->type == NodeTypeBinOpExpr);
LLVMValueRef val1 = gen_expr(g, node->data.bin_op_expr.op1);
LLVMValueRef val2 = gen_expr(g, node->data.bin_op_expr.op2);
// TODO implement type system so that we know whether to do signed or unsigned comparison here
LLVMIntPredicate pred = cmp_op_to_int_predicate(node->data.bin_op_expr.bin_op, true);
TypeTableEntry *op1_type = get_expr_type(node->data.bin_op_expr.op1);
TypeTableEntry *op2_type = get_expr_type(node->data.bin_op_expr.op2);
assert(op1_type == op2_type);
add_debug_source_node(g, node);
return LLVMBuildICmp(g->builder, pred, val1, val2, "");
if (op1_type->is_float) {
LLVMRealPredicate pred = cmp_op_to_real_predicate(node->data.bin_op_expr.bin_op);
return LLVMBuildFCmp(g->builder, pred, val1, val2, "");
} else {
LLVMIntPredicate pred = cmp_op_to_int_predicate(node->data.bin_op_expr.bin_op, op1_type->is_signed_int);
return LLVMBuildICmp(g->builder, pred, val1, val2, "");
}
}
static LLVMValueRef gen_bool_and_expr(CodeGen *g, AstNode *node) {
@ -847,12 +900,26 @@ static void define_primitive_types(CodeGen *g) {
buf_init_from_str(&entry->name, "i32");
entry->size_in_bits = 32;
entry->align_in_bits = 32;
entry->is_signed_int = true;
entry->di_type = LLVMZigCreateDebugBasicType(g->dbuilder, buf_ptr(&entry->name),
entry->size_in_bits, entry->align_in_bits,
LLVMZigEncoding_DW_ATE_signed());
g->type_table.put(&entry->name, entry);
g->builtin_types.entry_i32 = entry;
}
{
TypeTableEntry *entry = new_type_table_entry();
entry->type_ref = LLVMFloatType();
buf_init_from_str(&entry->name, "f32");
entry->size_in_bits = 32;
entry->align_in_bits = 32;
entry->is_float = true;
entry->di_type = LLVMZigCreateDebugBasicType(g->dbuilder, buf_ptr(&entry->name),
entry->size_in_bits, entry->align_in_bits,
LLVMZigEncoding_DW_ATE_float());
g->type_table.put(&entry->name, entry);
g->builtin_types.entry_f32 = entry;
}
{
TypeTableEntry *entry = new_type_table_entry();
entry->type_ref = LLVMVoidType();
@ -918,6 +985,8 @@ static void init(CodeGen *g, Buf *source_path) {
g->builder = LLVMCreateBuilder();
g->dbuilder = LLVMZigCreateDIBuilder(g->module, true);
LLVMZigSetFastMath(g->builder, true);
define_primitive_types(g);
@ -1058,6 +1127,8 @@ static void to_c_type(CodeGen *g, AstNode *type_node, Buf *out_buf) {
} else if (type_entry == g->builtin_types.entry_i32) {
g->c_stdint_used = true;
buf_init_from_str(out_buf, "int32_t");
} else if (type_entry == g->builtin_types.entry_f32) {
buf_init_from_str(out_buf, "float");
} else if (type_entry == g->builtin_types.entry_unreachable) {
buf_init_from_str(out_buf, "__attribute__((__noreturn__)) void");
} else if (type_entry == g->builtin_types.entry_bool) {

3
src/semantic_info.hpp
View file

@ -21,6 +21,8 @@ struct TypeTableEntry {
LLVMZigDIType *di_type;
uint64_t size_in_bits;
uint64_t align_in_bits;
bool is_signed_int;
bool is_float;
TypeTableEntry *pointer_child;
bool pointer_is_const;
@ -82,6 +84,7 @@ struct CodeGen {
TypeTableEntry *entry_bool;
TypeTableEntry *entry_u8;
TypeTableEntry *entry_i32;
TypeTableEntry *entry_f32;
TypeTableEntry *entry_string_literal;
TypeTableEntry *entry_void;
TypeTableEntry *entry_unreachable;

14
src/zig_llvm.cpp
View file

@ -185,6 +185,10 @@ unsigned LLVMZigEncoding_DW_ATE_signed(void) {
return dwarf::DW_ATE_signed;
}
unsigned LLVMZigEncoding_DW_ATE_float(void) {
return dwarf::DW_ATE_float;
}
unsigned LLVMZigLang_DW_LANG_C99(void) {
return dwarf::DW_LANG_C99;
}
@ -322,6 +326,16 @@ LLVMZigDILocation *LLVMZigGetDebugLoc(unsigned line, unsigned col, LLVMZigDIScop
return reinterpret_cast<LLVMZigDILocation*>(debug_loc.get());
}
void LLVMZigSetFastMath(LLVMBuilderRef builder_wrapped, bool on_state) {
if (on_state) {
FastMathFlags fmf;
fmf.setUnsafeAlgebra();
unwrap(builder_wrapped)->SetFastMathFlags(fmf);
} else {
unwrap(builder_wrapped)->clearFastMathFlags();
}
}
//------------------------------------
enum FloatAbi {

3
src/zig_llvm.hpp
View file

@ -55,6 +55,7 @@ LLVMZigDISubroutineType *LLVMZigCreateSubroutineType(LLVMZigDIBuilder *dibuilder
unsigned LLVMZigEncoding_DW_ATE_unsigned(void);
unsigned LLVMZigEncoding_DW_ATE_signed(void);
unsigned LLVMZigEncoding_DW_ATE_float(void);
unsigned LLVMZigLang_DW_LANG_C99(void);
unsigned LLVMZigTag_DW_auto_variable(void);
unsigned LLVMZigTag_DW_arg_variable(void);
@ -96,6 +97,8 @@ LLVMValueRef LLVMZigInsertDeclare(LLVMZigDIBuilder *dibuilder, LLVMValueRef stor
LLVMZigDILocalVariable *var_info, LLVMZigDILocation *debug_loc, LLVMValueRef insert_before_instr);
LLVMZigDILocation *LLVMZigGetDebugLoc(unsigned line, unsigned col, LLVMZigDIScope *scope);
void LLVMZigSetFastMath(LLVMBuilderRef builder_wrapped, bool on_state);
/*
* This stuff is not LLVM API but it depends on the LLVM C++ API so we put it here.