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tkf/00_ref_alloca.ipynb

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00_ref_alloca.ipynb
{
"cells": [
{
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": "IRDumps.Internal.FunctionCollection with 11 entries:\n \"jfptr_ref_alloca_demo_9\" => [IRDump(597, \"jfptr_ref_alloca_demo_9\", \"Propaga…\n \"japi1_include_string_6\" => [IRDump(399, \"japi1_include_string_6\", \"Merge Du…\n \"julia_ConsoleLogger_2\" => [IRDump(172, \"julia_ConsoleLogger_2\", \"Merge Dup…\n \"jfptr_TextDisplay_1\" => [IRDump(6, \"jfptr_TextDisplay_1\", \"Propagate (no…\n \"jfptr_TTYTerminal_5\" => [IRDump(349, \"jfptr_TTYTerminal_5\", \"Simplify th…\n \"julia_ref_alloca_demo_8\" => [IRDump(592, \"julia_ref_alloca_demo_8\", \"Merge D…\n \"japi1_preserve_7\" => [IRDump(489, \"japi1_preserve_7\", \"Merge Duplicat…\n nothing => [IRDump(10, nothing, \"Inliner for always_inline …\n \"julia_TTYTerminal_4\" => [IRDump(343, \"julia_TTYTerminal_4\", \"Merge Dupli…\n \"jfptr_ConsoleLogger_3\" => [IRDump(177, \"jfptr_ConsoleLogger_3\", \"Propagate…\n \"julia_TextDisplay_0\" => [IRDump(1, \"julia_TextDisplay_0\", \"Merge Duplica…"
},
"metadata": {},
"execution_count": 1
}
],
"cell_type": "code",
"source": [
"using IRDumps\n",
"using InteractiveUtils\n",
"\n",
"begin\n",
" # Julia code to be executed in an external process\n",
" code = \"\"\"\n",
" function ref_alloca_demo()\n",
" ref = Ref(0)\n",
" ptr = Ptr{Int}(pointer_from_objref(ref))\n",
" GC.@preserve ref begin\n",
" yield()\n",
" unsafe_store!(ptr, 123)\n",
" end\n",
" ref[]\n",
" end\n",
"\n",
" ref_alloca_demo()\n",
" \"\"\"\n",
"\n",
" # Dump LLVM IR with JULIA_LLVM_ARGS=-print-after-all\n",
" irs = IRDumps.dump(code)\n",
" passes = only(values(irs[r\"julia_ref_alloca_demo\"]))\n",
" irs\n",
"end"
],
"metadata": {},
"execution_count": 1
},
{
"cell_type": "markdown",
"source": [
"### Unoptimized LLVM IR"
],
"metadata": {}
},
{
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": "*** IR Dump of \u001b[34m\u001b[1mjulia_ref_alloca_demo_8\u001b[22m\u001b[39m After \u001b[34m\u001b[1mMerge Duplicate Global Constants\u001b[22m\u001b[39m ***\n\u001b[95mdefine\u001b[39m \u001b[36mi64\u001b[39m \u001b[93m@julia_ref_alloca_demo_8\u001b[39m\u001b[33m(\u001b[39m\u001b[33m)\u001b[39m \u001b[0m!dbg \u001b[0m!5 \u001b[33m{\u001b[39m\n\u001b[91mtop:\u001b[39m\n \u001b[0m%0 \u001b[0m= \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*** \u001b[93m@julia.ptls_states\u001b[39m\u001b[33m(\u001b[39m\u001b[33m)\u001b[39m\n \u001b[0m%1 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*** \u001b[0m%0 \u001b[95mto\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m**\n \u001b[0m%2 \u001b[0m= \u001b[96m\u001b[1mgetelementptr\u001b[22m\u001b[39m \u001b[95minbounds\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*\u001b[0m, \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m** \u001b[0m%1\u001b[0m, \u001b[36mi64\u001b[39m \u001b[33m4\u001b[39m\n \u001b[0m%3 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m** \u001b[0m%2 \u001b[95mto\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m**\n \u001b[0m%4 \u001b[0m= \u001b[96m\u001b[1mload\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m*\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m** \u001b[0m%3\u001b[0m, \u001b[95malign\u001b[39m \u001b[33m8\u001b[39m\u001b[0m, \u001b[0m!tbaa \u001b[0m!7\u001b[0m, \u001b[0m!invariant.load \u001b[0m!4\n \u001b[0m%5 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*** \u001b[0m%0 \u001b[95mto\u001b[39m \u001b[36mi8\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m!dbg \u001b[0m!11\n \u001b[0m%6 \u001b[0m= \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[95mnoalias\u001b[39m \u001b[95mnonnull\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[93m@julia.gc_alloc_obj\u001b[39m\u001b[33m(\u001b[39m\u001b[36mi8\u001b[39m\u001b[0m* \u001b[0m%5\u001b[0m, \u001b[36mi64\u001b[39m \u001b[33m8\u001b[39m\u001b[0m, \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[95maddrspacecast\u001b[39m \u001b[33m(\u001b[39m\u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[95minttoptr\u001b[39m \u001b[33m(\u001b[39m\u001b[36mi64\u001b[39m \u001b[33m140386211816368\u001b[39m \u001b[95mto\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*\u001b[33m)\u001b[39m \u001b[95mto\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*\u001b[33m)\u001b[39m\u001b[33m)\u001b[39m \u001b[0m#1\u001b[0m, \u001b[0m!dbg \u001b[0m!11\n \u001b[0m%7 \u001b[0m= \u001b[0m%6 \u001b[90m; %7 = addrspacecast {} addrspace(10)* %6 to {} addrspace(11)*, !dbg !11\u001b[39m\n \u001b[0m%8 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%6 \u001b[95mto\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m!dbg \u001b[0m!11\n \u001b[96m\u001b[1mstore\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m \u001b[33m0\u001b[39m\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%8\u001b[0m, \u001b[95malign\u001b[39m \u001b[33m8\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!11\u001b[0m, \u001b[0m!tbaa \u001b[0m!19\n \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[36mvoid\u001b[39m \u001b[33m(\u001b[39m\u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m...\u001b[33m)\u001b[39m \u001b[93m@julia.write_barrier\u001b[39m\u001b[33m(\u001b[39m\u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%6\u001b[33m)\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!11\n \u001b[0m%9 \u001b[0m= \u001b[0m%6 \u001b[90m; %9 = addrspacecast {} addrspace(10)* %6 to {} addrspace(11)*, !dbg !23\u001b[39m\n \u001b[0m%10 \u001b[0m= \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[95mnonnull\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[93m@julia.pointer_from_objref\u001b[39m\u001b[33m(\u001b[39m\u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%9\u001b[33m)\u001b[39m \u001b[0m#3\u001b[0m, \u001b[0m!dbg \u001b[0m!23\n \u001b[0m%11 \u001b[0m= \u001b[96m\u001b[1mptrtoint\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%10 \u001b[95mto\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!23\n \u001b[0m%12 \u001b[0m= \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[36mtoken\u001b[39m \u001b[33m(\u001b[39m\u001b[0m...\u001b[33m)\u001b[39m \u001b[93m@llvm.julia.gc_preserve_begin\u001b[39m\u001b[33m(\u001b[39m\u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%6\u001b[33m)\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!27\n \u001b[0m%13 \u001b[0m= \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[95mnonnull\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[93m@jlsys_yield_2\u001b[39m\u001b[33m(\u001b[39m\u001b[33m)\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!28\n \u001b[0m%14 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%10 \u001b[95mto\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m!dbg \u001b[0m!29\n \u001b[0m%15 \u001b[0m= \u001b[96m\u001b[1mgetelementptr\u001b[22m\u001b[39m \u001b[95minbounds\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%14\u001b[0m, \u001b[36mi64\u001b[39m \u001b[33m0\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!29\n \u001b[96m\u001b[1mstore\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m \u001b[33m123\u001b[39m\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%15\u001b[0m, \u001b[95malign\u001b[39m \u001b[33m1\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!29\u001b[0m, \u001b[0m!tbaa \u001b[0m!33\n \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[36mvoid\u001b[39m \u001b[93m@llvm.julia.gc_preserve_end\u001b[39m\u001b[33m(\u001b[39m\u001b[36mtoken\u001b[39m \u001b[0m%12\u001b[33m)\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!32\n \u001b[0m%16 \u001b[0m= \u001b[0m%6 \u001b[90m; %16 = addrspacecast {} addrspace(10)* %6 to {} addrspace(11)*, !dbg !34\u001b[39m\n \u001b[0m%17 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%16 \u001b[95mto\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m!dbg \u001b[0m!34\n \u001b[0m%18 \u001b[0m= \u001b[96m\u001b[1mload\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%17\u001b[0m, \u001b[95malign\u001b[39m \u001b[33m8\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!34\u001b[0m, \u001b[0m!tbaa \u001b[0m!19\n \u001b[96m\u001b[1mret\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m \u001b[0m%18\u001b[0m, \u001b[0m!dbg \u001b[0m!39\n\u001b[33m}\u001b[39m\n"
},
"metadata": {},
"execution_count": 2
}
],
"cell_type": "code",
"source": [
"first(passes)"
],
"metadata": {},
"execution_count": 2
},
{
"cell_type": "markdown",
"source": [
"### Just after the first llvm-alloc-opt"
],
"metadata": {}
},
{
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": "*** IR Dump of \u001b[34m\u001b[1mjulia_ref_alloca_demo_8\u001b[22m\u001b[39m After \u001b[34m\u001b[1mPromote heap allocation to stack\u001b[22m\u001b[39m ***\n\u001b[95mdefine\u001b[39m \u001b[36mi64\u001b[39m \u001b[93m@julia_ref_alloca_demo_8\u001b[39m\u001b[33m(\u001b[39m\u001b[33m)\u001b[39m \u001b[0m!dbg \u001b[0m!5 \u001b[33m{\u001b[39m\n\u001b[91mtop:\u001b[39m\n \u001b[0m%0 \u001b[0m= \u001b[96m\u001b[1malloca\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m, \u001b[95malign\u001b[39m \u001b[33m16\u001b[39m\n \u001b[0m%1 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%0 \u001b[95mto\u001b[39m \u001b[36mi8\u001b[39m\u001b[0m*\n \u001b[0m%2 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[36mi8\u001b[39m\u001b[0m* \u001b[0m%1 \u001b[95mto\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*\n \u001b[0m%3 \u001b[0m= \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*** \u001b[93m@julia.ptls_states\u001b[39m\u001b[33m(\u001b[39m\u001b[33m)\u001b[39m\n \u001b[0m%4 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m*** \u001b[0m%3 \u001b[95mto\u001b[39m \u001b[36mi8\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m!dbg \u001b[0m!7\n \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[36mvoid\u001b[39m \u001b[93m@llvm.lifetime.start.p0i8\u001b[39m\u001b[33m(\u001b[39m\u001b[36mi64\u001b[39m \u001b[33m8\u001b[39m\u001b[0m, \u001b[36mi8\u001b[39m\u001b[0m* \u001b[0m%1\u001b[33m)\u001b[39m\n \u001b[0m%5 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%2 \u001b[95mto\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m!dbg \u001b[0m!7\n \u001b[96m\u001b[1mstore\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m \u001b[33m0\u001b[39m\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%5\u001b[0m, \u001b[95malign\u001b[39m \u001b[33m8\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!7\u001b[0m, \u001b[0m!tbaa \u001b[0m!15\n \u001b[0m%6 \u001b[0m= \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[95mnonnull\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[93m@jlsys_yield_2\u001b[39m\u001b[33m(\u001b[39m\u001b[33m)\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!21\n \u001b[0m%7 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%2 \u001b[95mto\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m!dbg \u001b[0m!22\n \u001b[0m%8 \u001b[0m= \u001b[96m\u001b[1mgetelementptr\u001b[22m\u001b[39m \u001b[95minbounds\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%7\u001b[0m, \u001b[36mi64\u001b[39m \u001b[33m0\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!22\n \u001b[96m\u001b[1mstore\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m \u001b[33m123\u001b[39m\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%8\u001b[0m, \u001b[95malign\u001b[39m \u001b[33m1\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!22\u001b[0m, \u001b[0m!tbaa \u001b[0m!27\n \u001b[0m%9 \u001b[0m= \u001b[96m\u001b[1mbitcast\u001b[22m\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[0m%2 \u001b[95mto\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m*\u001b[0m, \u001b[0m!dbg \u001b[0m!28\n \u001b[0m%10 \u001b[0m= \u001b[96m\u001b[1mload\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m\u001b[0m, \u001b[36mi64\u001b[39m\u001b[0m* \u001b[0m%9\u001b[0m, \u001b[95malign\u001b[39m \u001b[33m8\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!28\u001b[0m, \u001b[0m!tbaa \u001b[0m!15\n \u001b[96m\u001b[1mret\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m \u001b[0m%10\u001b[0m, \u001b[0m!dbg \u001b[0m!33\n\u001b[33m}\u001b[39m\n"
},
"metadata": {},
"execution_count": 3
}
],
"cell_type": "code",
"source": [
"allocopt = first(ir for ir in passes if ir.pass == \"Promote heap allocation to stack\")"
],
"metadata": {},
"execution_count": 3
},
{
"cell_type": "markdown",
"source": [
"### Fully optimized LLVM IR"
],
"metadata": {}
},
{
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": "*** IR Dump of \u001b[34m\u001b[1mjulia_ref_alloca_demo_8\u001b[22m\u001b[39m After \u001b[34m\u001b[1mSafe Stack instrumentation pass\u001b[22m\u001b[39m ***\n\u001b[95mdefine\u001b[39m \u001b[36mi64\u001b[39m \u001b[93m@julia_ref_alloca_demo_8\u001b[39m\u001b[33m(\u001b[39m\u001b[33m)\u001b[39m \u001b[0m!dbg \u001b[0m!5 \u001b[33m{\u001b[39m\n\u001b[91mtop:\u001b[39m\n \u001b[0m%0 \u001b[0m= \u001b[96m\u001b[1mcall\u001b[22m\u001b[39m \u001b[95mnonnull\u001b[39m \u001b[33m{\u001b[39m\u001b[33m}\u001b[39m\u001b[0m* \u001b[93m@jlsys_yield_2\u001b[39m\u001b[33m(\u001b[39m\u001b[33m)\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!7\n \u001b[96m\u001b[1mret\u001b[22m\u001b[39m \u001b[36mi64\u001b[39m \u001b[33m123\u001b[39m\u001b[0m, \u001b[0m!dbg \u001b[0m!8\n\u001b[33m}\u001b[39m\n"
},
"metadata": {},
"execution_count": 4
}
],
"cell_type": "code",
"source": [
"last(passes)"
],
"metadata": {},
"execution_count": 4
},
{
"cell_type": "markdown",
"source": [
"## Appendix"
],
"metadata": {}
},
{
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Julia Version 1.6.0\n",
"Commit f9720dc2eb (2021-03-24 12:55 UTC)\n",
"Platform Info:\n",
" OS: Linux (x86_64-pc-linux-gnu)\n",
" CPU: AMD EPYC 7502 32-Core Processor\n",
" WORD_SIZE: 64\n",
" LIBM: libopenlibm\n",
" LLVM: libLLVM-11.0.1 (ORCJIT, znver2)\n",
"Environment:\n",
" JULIA_PROJECT = /home/arakaki/repos/scratch/2021/julia/ref-alloca\n",
" JULIA_LOAD_PATH = @\n"
]
}
],
"cell_type": "code",
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"versioninfo()"
],
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"execution_count": 5
},
{
"cell_type": "markdown",
"source": [
"---\n",
"\n",
"*This notebook was generated using [Literate.jl](https://github.com/fredrikekre/Literate.jl).*"
],
"metadata": {}
}
],
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"language": "julia"
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},
"nbformat": 4
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Raw
Manifest.toml
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Project.toml
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Raw
ref_alloca.jl
using IRDumps
using InteractiveUtils
begin
# Julia code to be executed in an external process
code = """
function ref_alloca_demo()
ref = Ref(0)
ptr = Ptr{Int}(pointer_from_objref(ref))
GC.@preserve ref begin
yield()
unsafe_store!(ptr, 123)
end
ref[]
end
ref_alloca_demo()
"""
# Dump LLVM IR with JULIA_LLVM_ARGS=-print-after-all
irs = IRDumps.dump(code)
passes = only(values(irs[r"julia_ref_alloca_demo"]))
irs
end
#-
# ### Unoptimized LLVM IR
first(passes)
#-
# ### Just after the first llvm-alloc-opt
allocopt = first(ir for ir in passes if ir.pass == "Promote heap allocation to stack")
#-
# ### Fully optimized LLVM IR
last(passes)
#-
# ## Appendix
versioninfo()
#-
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