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#Fix 1615 Replace llvm.readcyclecounter with cntvct_el0 on arm64

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This commit is contained in:
gingerBill
2022-03-12 10:48:31 +00:00
parent c12c7d5370
commit f907516cbd
2 changed files with 16 additions and 7 deletions
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src/llvm_backend_proc.cpp
+15 -6
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@@ -1402,14 +1402,23 @@ lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValue const &tv,
case BuiltinProc_read_cycle_counter:
{
char const *name = "llvm.readcyclecounter";
unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
GB_ASSERT_MSG(id != 0, "Unable to find %s", name);
LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, nullptr, 0);
lbValue res = {};
res.value = LLVMBuildCall(p->builder, ip, nullptr, 0, "");
res.type = tv.type;
if (build_context.metrics.arch == TargetArch_arm64) {
LLVMTypeRef func_type = LLVMFunctionType(LLVMInt64TypeInContext(p->module->ctx), nullptr, 0, false);
bool has_side_effects = false;
LLVMValueRef the_asm = llvm_get_inline_asm(func_type, str_lit("mrs x9, cntvct_el0"), str_lit("=r"), has_side_effects);
GB_ASSERT(the_asm != nullptr);
res.value = LLVMBuildCall2(p->builder, func_type, the_asm, nullptr, 0, "");
} else {
char const *name = "llvm.readcyclecounter";
unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
GB_ASSERT_MSG(id != 0, "Unable to find %s", name);
LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, nullptr, 0);
res.value = LLVMBuildCall(p->builder, ip, nullptr, 0, "");
}
return res;
}