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use the correct frequency for the arm tsc timer

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Colin Davidson
2025-07-28 15:10:42 -07:00
parent b88f9194d0
commit 1848e0df05
5 changed files with 22 additions and 1 deletions
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13
src/llvm_backend_proc.cpp
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@@ -2809,6 +2809,19 @@ gb_internal lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValu
}
return res;
}
case BuiltinProc_arm64_read_cycle_counter_frequency:
{
lbValue res = {};
res.type = tv.type;
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 $0, cntfrq_el0"), str_lit("=r"), has_side_effects);
GB_ASSERT(the_asm != nullptr);
res.value = LLVMBuildCall2(p->builder, func_type, the_asm, nullptr, 0, "");
return res;
}
case BuiltinProc_count_trailing_zeros:
return lb_emit_count_trailing_zeros(p, lb_build_expr(p, ce->args[0]), tv.type);