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Improve codegen for stack allocated large non-zero arrays.

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This commit is contained in:
Christoffer Lerno
2025-08-12 17:01:33 +02:00
parent fd9fbe26a1
commit db99de9717
3 changed files with 87 additions and 2 deletions
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21
src/compiler/llvm_codegen_expr.c
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@@ -1439,6 +1439,24 @@ static inline void llvm_emit_const_initialize_bitstruct_ref(GenContext *c, BEVal
llvm_store_raw(c, ref, llvm_emit_const_bitstruct(c, initializer));
}
static bool llvm_should_use_const_copy(ConstInitializer *const_init)
{
if (type_size(const_init->type) <= 32) return true;
switch (const_init->kind)
{
case CONST_INIT_ZERO:
case CONST_INIT_STRUCT:
case CONST_INIT_UNION:
case CONST_INIT_ARRAY_VALUE:
case CONST_INIT_VALUE:
return false;
case CONST_INIT_ARRAY:
return vec_size(const_init->init_array.elements) >= 16;
case CONST_INIT_ARRAY_FULL:
return true;
}
UNREACHABLE
}
static void llvm_emit_const_init_ref(GenContext *c, BEValue *ref, ConstInitializer *const_init, bool top)
{
if (const_init->type->type_kind == TYPE_VECTOR)
@@ -1459,7 +1477,7 @@ static void llvm_emit_const_init_ref(GenContext *c, BEValue *ref, ConstInitializ
return;
}
// In case of small const initializers, or full arrays - use copy.
if (const_init->kind == CONST_INIT_ARRAY_FULL || type_size(const_init->type) <= 32)
if (llvm_should_use_const_copy(const_init))
{
if (top && const_init_local_init_may_be_global(const_init))
{
@@ -2022,7 +2040,6 @@ static inline void llvm_emit_const_initialize_reference(GenContext *c, BEValue *
ASSERT(expr_is_const_initializer(expr));
ASSERT(type_flatten(expr->type)->type_kind != TYPE_SLICE);
llvm_emit_const_init_ref(c, ref, expr->const_expr.initializer, true);
return;
}
/**