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Improve llreg integer type generation for SysV ABI

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This commit is contained in:
gingerBill
2023-03-19 01:29:53 +00:00
parent fa62963da7
commit fe533fb809
1 changed files with 81 additions and 60 deletions
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141
src/llvm_abi.cpp
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@@ -787,69 +787,90 @@ namespace lbAbiAmd64SysV {
gb_internal LLVMTypeRef llreg(LLVMContextRef c, Array<RegClass> const &reg_classes, LLVMTypeRef type) {
auto types = array_make<LLVMTypeRef>(heap_allocator(), 0, reg_classes.count);
for (isize i = 0; i < reg_classes.count; /**/) {
RegClass reg_class = reg_classes[i];
switch (reg_class) {
case RegClass_Int:
if (reg_classes.count == 1) {
array_add(&types, LLVMIntTypeInContext(c, cast(unsigned)(lb_sizeof(type)*8)));
} else {
array_add(&types, LLVMIntTypeInContext(c, 64));
}
break;
case RegClass_SSEFv:
case RegClass_SSEDv:
case RegClass_SSEInt8:
case RegClass_SSEInt16:
case RegClass_SSEInt32:
case RegClass_SSEInt64:
{
unsigned elems_per_word = 0;
LLVMTypeRef elem_type = nullptr;
switch (reg_class) {
case RegClass_SSEFv:
elems_per_word = 2;
elem_type = LLVMFloatTypeInContext(c);
break;
case RegClass_SSEDv:
elems_per_word = 1;
elem_type = LLVMDoubleTypeInContext(c);
break;
case RegClass_SSEInt8:
elems_per_word = 64/8;
elem_type = LLVMIntTypeInContext(c, 8);
break;
case RegClass_SSEInt16:
elems_per_word = 64/16;
elem_type = LLVMIntTypeInContext(c, 16);
break;
case RegClass_SSEInt32:
elems_per_word = 64/32;
elem_type = LLVMIntTypeInContext(c, 32);
break;
case RegClass_SSEInt64:
elems_per_word = 64/64;
elem_type = LLVMIntTypeInContext(c, 64);
break;
}
unsigned vec_len = llvec_len(reg_classes, i+1);
LLVMTypeRef vec_type = LLVMVectorType(elem_type, vec_len * elems_per_word);
array_add(&types, vec_type);
i += vec_len;
continue;
}
bool all_ints = true;
for (RegClass reg_class : reg_classes) {
if (reg_class != RegClass_Int) {
all_ints = false;
break;
case RegClass_SSEFs:
array_add(&types, LLVMFloatTypeInContext(c));
break;
case RegClass_SSEDs:
array_add(&types, LLVMDoubleTypeInContext(c));
break;
default:
GB_PANIC("Unhandled RegClass");
}
i += 1;
}
if (all_ints) {
i64 sz = lb_sizeof(type);
for_array(i, reg_classes) {
GB_ASSERT(sz != 0);
// TODO(bill): is this even correct? BECAUSE LLVM DOES NOT DOCUMENT ANY OF THIS!!!
if (sz >= 8) {
array_add(&types, LLVMIntTypeInContext(c, 64));
sz -= 8;
} else {
array_add(&types, LLVMIntTypeInContext(c, cast(unsigned)(sz*8)));
sz = 0;
}
}
} else {
for (isize i = 0; i < reg_classes.count; /**/) {
RegClass reg_class = reg_classes[i];
switch (reg_class) {
case RegClass_Int:
// TODO(bill): is this even correct? BECAUSE LLVM DOES NOT DOCUMENT ANY OF THIS!!!
array_add(&types, LLVMIntTypeInContext(c, 64));
break;
case RegClass_SSEFv:
case RegClass_SSEDv:
case RegClass_SSEInt8:
case RegClass_SSEInt16:
case RegClass_SSEInt32:
case RegClass_SSEInt64:
{
unsigned elems_per_word = 0;
LLVMTypeRef elem_type = nullptr;
switch (reg_class) {
case RegClass_SSEFv:
elems_per_word = 2;
elem_type = LLVMFloatTypeInContext(c);
break;
case RegClass_SSEDv:
elems_per_word = 1;
elem_type = LLVMDoubleTypeInContext(c);
break;
case RegClass_SSEInt8:
elems_per_word = 64/8;
elem_type = LLVMIntTypeInContext(c, 8);
break;
case RegClass_SSEInt16:
elems_per_word = 64/16;
elem_type = LLVMIntTypeInContext(c, 16);
break;
case RegClass_SSEInt32:
elems_per_word = 64/32;
elem_type = LLVMIntTypeInContext(c, 32);
break;
case RegClass_SSEInt64:
elems_per_word = 64/64;
elem_type = LLVMIntTypeInContext(c, 64);
break;
}
unsigned vec_len = llvec_len(reg_classes, i+1);
LLVMTypeRef vec_type = LLVMVectorType(elem_type, vec_len * elems_per_word);
array_add(&types, vec_type);
i += vec_len;
continue;
}
break;
case RegClass_SSEFs:
array_add(&types, LLVMFloatTypeInContext(c));
break;
case RegClass_SSEDs:
array_add(&types, LLVMDoubleTypeInContext(c));
break;
default:
GB_PANIC("Unhandled RegClass");
}
i += 1;
}
}
if (types.count == 1) {