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create multiple llvm.memcpy and llvm.memset with different align params

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This commit is contained in:
Andrew Kelley 2018-03-22 20:22:15 -04:00
parent 62668e3e6b
commit fe38d8142f
3 changed files with 67 additions and 34 deletions
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11
src/all_types.hpp
View File

@ -1415,6 +1415,8 @@ enum ZigLLVMFnId {
ZigLLVMFnIdOverflowArithmetic,
ZigLLVMFnIdFloor,
ZigLLVMFnIdCeil,
ZigLLVMFnIdMemcpy,
ZigLLVMFnIdMemset,
};
enum AddSubMul {
@ -1441,6 +1443,13 @@ struct ZigLLVMFnKey {
uint32_t bit_count;
bool is_signed;
} overflow_arithmetic;
struct {
uint32_t dest_align;
uint32_t src_align;
} memcpy;
struct {
uint32_t dest_align;
} memset;
} data;
};
@ -1629,8 +1638,6 @@ struct CodeGen {
ImportTableEntry *root_import;
ImportTableEntry *bootstrap_import;
ImportTableEntry *test_runner_import;
LLVMValueRef memcpy_fn_val;
LLVMValueRef memset_fn_val;
LLVMValueRef trap_fn_val;
LLVMValueRef return_address_fn_val;
LLVMValueRef frame_address_fn_val;

9
src/analyze.cpp
View File

@ -5681,6 +5681,10 @@ uint32_t zig_llvm_fn_key_hash(ZigLLVMFnKey x) {
return ((uint32_t)(x.data.overflow_arithmetic.bit_count) * 87135777) +
((uint32_t)(x.data.overflow_arithmetic.add_sub_mul) * 31640542) +
((uint32_t)(x.data.overflow_arithmetic.is_signed) ? 1062315172 : 314955820);
case ZigLLVMFnIdMemcpy:
return x.data.memcpy.dest_align * 2325524557 + x.data.memcpy.src_align * 519976394;
case ZigLLVMFnIdMemset:
return x.data.memset.dest_align * 388171592;
}
zig_unreachable();
}
@ -5700,6 +5704,11 @@ bool zig_llvm_fn_key_eql(ZigLLVMFnKey a, ZigLLVMFnKey b) {
return (a.data.overflow_arithmetic.bit_count == b.data.overflow_arithmetic.bit_count) &&
(a.data.overflow_arithmetic.add_sub_mul == b.data.overflow_arithmetic.add_sub_mul) &&
(a.data.overflow_arithmetic.is_signed == b.data.overflow_arithmetic.is_signed);
case ZigLLVMFnIdMemcpy:
return (a.data.memcpy.dest_align == b.data.memcpy.dest_align) &&
(a.data.memcpy.src_align == b.data.memcpy.src_align);
case ZigLLVMFnIdMemset:
return (a.data.memset.dest_align == b.data.memset.dest_align);
}
zig_unreachable();
}

81
src/codegen.cpp
View File

@ -324,8 +324,12 @@ static void addLLVMFnAttrInt(LLVMValueRef fn_val, const char *attr_name, uint64_
return addLLVMAttrInt(fn_val, -1, attr_name, attr_val);
}
static void addLLVMArgAttr(LLVMValueRef arg_val, unsigned param_index, const char *attr_name) {
return addLLVMAttr(arg_val, param_index + 1, attr_name);
static void addLLVMArgAttr(LLVMValueRef fn_val, unsigned param_index, const char *attr_name) {
return addLLVMAttr(fn_val, param_index + 1, attr_name);
}
static void addLLVMArgAttrInt(LLVMValueRef fn_val, unsigned param_index, const char *attr_name, uint64_t attr_val) {
return addLLVMAttrInt(fn_val, param_index + 1, attr_name, attr_val);
}
static void addLLVMCallsiteAttr(LLVMValueRef call_instr, unsigned param_index, const char *attr_name) {
@ -912,23 +916,31 @@ static void gen_safety_crash(CodeGen *g, PanicMsgId msg_id) {
gen_panic(g, get_panic_msg_ptr_val(g, msg_id), nullptr);
}
static LLVMValueRef get_memcpy_fn_val(CodeGen *g) {
if (g->memcpy_fn_val)
return g->memcpy_fn_val;
static LLVMValueRef get_memcpy_fn_val(CodeGen *g, uint32_t dest_align, uint32_t src_align) {
ZigLLVMFnKey key = {};
key.id = ZigLLVMFnIdMemcpy;
key.data.memcpy.dest_align = dest_align;
key.data.memcpy.src_align = src_align;
auto existing_entry = g->llvm_fn_table.maybe_get(key);
if (existing_entry)
return existing_entry->value;
LLVMTypeRef param_types[] = {
LLVMPointerType(LLVMInt8Type(), 0),
LLVMPointerType(LLVMInt8Type(), 0),
LLVMIntType(g->pointer_size_bytes * 8),
LLVMInt32Type(),
LLVMInt1Type(),
};
LLVMTypeRef fn_type = LLVMFunctionType(LLVMVoidType(), param_types, 5, false);
LLVMTypeRef fn_type = LLVMFunctionType(LLVMVoidType(), param_types, 4, false);
Buf *name = buf_sprintf("llvm.memcpy.p0i8.p0i8.i%d", g->pointer_size_bytes * 8);
g->memcpy_fn_val = LLVMAddFunction(g->module, buf_ptr(name), fn_type);
assert(LLVMGetIntrinsicID(g->memcpy_fn_val));
LLVMValueRef fn_val = LLVMAddFunction(g->module, buf_ptr(name), fn_type);
addLLVMArgAttrInt(fn_val, 0, "align", dest_align);
addLLVMArgAttrInt(fn_val, 1, "align", src_align);
assert(LLVMGetIntrinsicID(fn_val));
return g->memcpy_fn_val;
g->llvm_fn_table.put(key, fn_val);
return fn_val;
}
static LLVMValueRef get_coro_destroy_fn_val(CodeGen *g) {
@ -1293,15 +1305,15 @@ static LLVMValueRef get_safety_crash_err_fn(CodeGen *g) {
LLVMValueRef len_field_ptr = LLVMBuildStructGEP(g->builder, err_name_val, slice_len_index, "");
LLVMValueRef err_name_len = gen_load_untyped(g, len_field_ptr, 0, false, "");
LLVMValueRef memcpy_fn_val = get_memcpy_fn_val(g, u8_align_bytes, u8_align_bytes);
LLVMValueRef params[] = {
offset_buf_ptr, // dest pointer
err_name_ptr, // source pointer
err_name_len, // size bytes
LLVMConstInt(LLVMInt32Type(), u8_align_bytes, false), // align bytes
LLVMConstNull(LLVMInt1Type()), // is volatile
};
LLVMBuildCall(g->builder, get_memcpy_fn_val(g), params, 5, "");
LLVMBuildCall(g->builder, memcpy_fn_val, params, 4, "");
LLVMValueRef const_prefix_len = LLVMConstInt(LLVMTypeOf(err_name_len), strlen(unwrap_err_msg_text), false);
LLVMValueRef full_buf_len = LLVMBuildNUWAdd(g->builder, const_prefix_len, err_name_len, "");
@ -1535,15 +1547,16 @@ static LLVMValueRef gen_assign_raw(CodeGen *g, LLVMValueRef ptr, TypeTableEntry
LLVMValueRef volatile_bit = ptr_type->data.pointer.is_volatile ?
LLVMConstAllOnes(LLVMInt1Type()) : LLVMConstNull(LLVMInt1Type());
LLVMValueRef memcpy_fn_val = get_memcpy_fn_val(g, align_bytes, align_bytes);
LLVMValueRef params[] = {
dest_ptr, // dest pointer
src_ptr, // source pointer
LLVMConstInt(usize->type_ref, size_bytes, false),
LLVMConstInt(LLVMInt32Type(), align_bytes, false),
volatile_bit,
};
LLVMBuildCall(g->builder, get_memcpy_fn_val(g), params, 5, "");
LLVMBuildCall(g->builder, memcpy_fn_val, params, 4, "");
return nullptr;
}
@ -2483,23 +2496,29 @@ static LLVMValueRef ir_render_bool_not(CodeGen *g, IrExecutable *executable, IrI
return LLVMBuildICmp(g->builder, LLVMIntEQ, value, zero, "");
}
static LLVMValueRef get_memset_fn_val(CodeGen *g) {
if (g->memset_fn_val)
return g->memset_fn_val;
static LLVMValueRef get_memset_fn_val(CodeGen *g, uint32_t dest_align) {
ZigLLVMFnKey key = {};
key.id = ZigLLVMFnIdMemset;
key.data.memset.dest_align = dest_align;
auto existing_entry = g->llvm_fn_table.maybe_get(key);
if (existing_entry)
return existing_entry->value;
LLVMTypeRef param_types[] = {
LLVMPointerType(LLVMInt8Type(), 0),
LLVMInt8Type(),
LLVMIntType(g->pointer_size_bytes * 8),
LLVMInt32Type(),
LLVMInt1Type(),
};
LLVMTypeRef fn_type = LLVMFunctionType(LLVMVoidType(), param_types, 5, false);
LLVMTypeRef fn_type = LLVMFunctionType(LLVMVoidType(), param_types, 4, false);
Buf *name = buf_sprintf("llvm.memset.p0i8.i%d", g->pointer_size_bytes * 8);
g->memset_fn_val = LLVMAddFunction(g->module, buf_ptr(name), fn_type);
assert(LLVMGetIntrinsicID(g->memset_fn_val));
LLVMValueRef fn_val = LLVMAddFunction(g->module, buf_ptr(name), fn_type);
addLLVMArgAttrInt(fn_val, 0, "align", dest_align);
assert(LLVMGetIntrinsicID(fn_val));
return g->memset_fn_val;
g->llvm_fn_table.put(key, fn_val);
return fn_val;
}
static LLVMValueRef ir_render_decl_var(CodeGen *g, IrExecutable *executable,
@ -2535,21 +2554,21 @@ static LLVMValueRef ir_render_decl_var(CodeGen *g, IrExecutable *executable,
assert(var->align_bytes > 0);
LLVMValueRef memset_fn_val = get_memset_fn_val(g, var->align_bytes);
// memset uninitialized memory to 0xa
LLVMTypeRef ptr_u8 = LLVMPointerType(LLVMInt8Type(), 0);
LLVMValueRef fill_char = LLVMConstInt(LLVMInt8Type(), 0xaa, false);
LLVMValueRef dest_ptr = LLVMBuildBitCast(g->builder, var->value_ref, ptr_u8, "");
LLVMValueRef byte_count = LLVMConstInt(usize->type_ref, size_bytes, false);
LLVMValueRef align_in_bytes = LLVMConstInt(LLVMInt32Type(), var->align_bytes, false);
LLVMValueRef params[] = {
dest_ptr,
fill_char,
byte_count,
align_in_bytes,
LLVMConstNull(LLVMInt1Type()), // is volatile
};
LLVMBuildCall(g->builder, get_memset_fn_val(g), params, 5, "");
LLVMBuildCall(g->builder, memset_fn_val, params, 4, "");
}
}
@ -3399,17 +3418,16 @@ static LLVMValueRef ir_render_memset(CodeGen *g, IrExecutable *executable, IrIns
LLVMValueRef is_volatile = ptr_type->data.pointer.is_volatile ?
LLVMConstAllOnes(LLVMInt1Type()) : LLVMConstNull(LLVMInt1Type());
LLVMValueRef align_val = LLVMConstInt(LLVMInt32Type(), ptr_type->data.pointer.alignment, false);
LLVMValueRef memset_fn_val = get_memset_fn_val(g, ptr_type->data.pointer.alignment);
LLVMValueRef params[] = {
dest_ptr_casted,
char_val,
len_val,
align_val,
is_volatile,
};
LLVMBuildCall(g->builder, get_memset_fn_val(g), params, 5, "");
LLVMBuildCall(g->builder, memset_fn_val, params, 4, "");
return nullptr;
}
@ -3432,18 +3450,17 @@ static LLVMValueRef ir_render_memcpy(CodeGen *g, IrExecutable *executable, IrIns
LLVMValueRef is_volatile = (dest_ptr_type->data.pointer.is_volatile || src_ptr_type->data.pointer.is_volatile) ?
LLVMConstAllOnes(LLVMInt1Type()) : LLVMConstNull(LLVMInt1Type());
uint32_t min_align_bytes = min(src_ptr_type->data.pointer.alignment, dest_ptr_type->data.pointer.alignment);
LLVMValueRef align_val = LLVMConstInt(LLVMInt32Type(), min_align_bytes, false);
LLVMValueRef memcpy_fn_val = get_memcpy_fn_val(g, dest_ptr_type->data.pointer.alignment,
src_ptr_type->data.pointer.alignment);
LLVMValueRef params[] = {
dest_ptr_casted,
src_ptr_casted,
len_val,
align_val,
is_volatile,
};
LLVMBuildCall(g->builder, get_memcpy_fn_val(g), params, 5, "");
LLVMBuildCall(g->builder, memcpy_fn_val, params, 4, "");
return nullptr;
}