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Force memset instead of store zeroinitializer when the value is large

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gingerBill
2022-07-24 20:22:50 +01:00
parent c8ab1b7ee1
commit e6ab4f4856
4 changed files with 19 additions and 8 deletions
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src/llvm_backend_utility.cpp
+4 -4
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@@ -50,14 +50,14 @@ lbValue lb_correct_endianness(lbProcedure *p, lbValue value) {
return value;
}
void lb_mem_zero_ptr_internal(lbProcedure *p, LLVMValueRef ptr, LLVMValueRef len, unsigned alignment, bool is_volatile) {
LLVMValueRef lb_mem_zero_ptr_internal(lbProcedure *p, LLVMValueRef ptr, LLVMValueRef len, unsigned alignment, bool is_volatile) {
bool is_inlinable = false;
i64 const_len = 0;
if (LLVMIsConstant(len)) {
const_len = cast(i64)LLVMConstIntGetSExtValue(len);
// TODO(bill): Determine when it is better to do the `*.inline` versions
if (const_len <= 4*build_context.word_size) {
if (const_len <= lb_max_zero_init_size()) {
is_inlinable = true;
}
}
@@ -83,7 +83,7 @@ void lb_mem_zero_ptr_internal(lbProcedure *p, LLVMValueRef ptr, LLVMValueRef len
args[2] = LLVMBuildIntCast2(p->builder, len, types[1], /*signed*/false, "");
args[3] = LLVMConstInt(LLVMInt1TypeInContext(p->module->ctx), is_volatile, false);
LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");
return LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");
} else {
LLVMValueRef ip = lb_lookup_runtime_procedure(p->module, str_lit("memset")).value;
@@ -92,7 +92,7 @@ void lb_mem_zero_ptr_internal(lbProcedure *p, LLVMValueRef ptr, LLVMValueRef len
args[1] = LLVMConstInt(LLVMInt32TypeInContext(p->module->ctx), 0, false);
args[2] = LLVMBuildIntCast2(p->builder, len, types[1], /*signed*/false, "");
LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");
return LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");
}
}