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Fix read_cycle_counter intrinsic on arm64

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Running this code with the hard-coded x9 register results in not 
returning the cycle count, but some other value.

This code (using $0 as the register), works on arm64 Linux and Darwin.
This commit is contained in:
William Roe committed 2023-08-07 21:18:56 +01:00
1 parent 9736402dfd
commit 5d8b78cb88
1 file changed
+1 -1
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src/llvm_backend_proc.cpp
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@@ -2115,7 +2115,7 @@ gb_internal lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValu
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);
LLVMValueRef the_asm = llvm_get_inline_asm(func_type, str_lit("mrs $0, 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 {