{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# LLVM 20 Debugging\n",
"\n",
"LLVM 15 and 20 produce different results with `fastmath=True` when inlining `get_inverse_doppler_factor` into `line_scatter_event`. This causes 1-2 ULP differences that cascade."
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"execution": {
"iopub.execute_input": "2026-03-12T19:22:15.788369Z",
"iopub.status.busy": "2026-03-12T19:22:15.788137Z",
"iopub.status.idle": "2026-03-12T19:22:15.922083Z",
"shell.execute_reply": "2026-03-12T19:22:15.920969Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"LLVM (20, 1, 8)\n"
]
}
],
"source": [
"import os, struct, re\n",
"os.environ[\"NUMBA_NUM_THREADS\"] = \"1\"\n",
"\n",
"import numpy as np\n",
"import llvmlite.binding as binding\n",
"print(f\"LLVM {binding.llvm_version_info}\")\n",
"\n",
"def f2h(f):\n",
" return struct.pack('!d', float(f)).hex()\n",
"\n",
"def ulp_diff(a, b):\n",
" ai = struct.unpack('!q', struct.pack('!d', a))[0]\n",
" bi = struct.unpack('!q', struct.pack('!d', b))[0]\n",
" return abs(ai - bi)"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"execution": {
"iopub.execute_input": "2026-03-12T19:22:15.971908Z",
"iopub.status.busy": "2026-03-12T19:22:15.971675Z",
"iopub.status.idle": "2026-03-12T19:22:42.409754Z",
"shell.execute_reply": "2026-03-12T19:22:42.408704Z"
}
},
"outputs": [
{
"data": {
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"model_id": "0024b5dd321d4cd78828c3095623c3d2",
"version_major": 2,
"version_minor": 0
},
"text/plain": [
"Iterations: 0/? [00:00\n",
" window.PlotlyConfig = {MathJaxConfig: 'local'};\n",
" if (window.MathJax && window.MathJax.Hub && window.MathJax.Hub.Config) {window.MathJax.Hub.Config({SVG: {font: \"STIX-Web\"}});}\n",
" if (typeof require !== 'undefined') {\n",
" require.undef(\"plotly\");\n",
" requirejs.config({\n",
" paths: {\n",
" 'plotly': ['https://cdn.plot.ly/plotly-2.32.0.min']\n",
" }\n",
" });\n",
" require(['plotly'], function(Plotly) {\n",
" window._Plotly = Plotly;\n",
" });\n",
" }\n",
" \n",
" "
]
},
"metadata": {},
"output_type": "display_data"
},
{
"data": {
"text/html": [
""
],
"text/plain": [
""
]
},
"metadata": {},
"output_type": "display_data"
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Initializing tabulator and plotly panel extensions for widgets to work\n"
]
},
{
"data": {
"text/html": [
""
]
},
"metadata": {},
"output_type": "display_data"
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i < links.length; i++) {\n const link = links[i]\n if (link.href != null) {\n existing_stylesheets.push(link.href)\n }\n }\n for (let i = 0; i < css_urls.length; i++) {\n const url = css_urls[i];\n const escaped = encodeURI(url)\n if (existing_stylesheets.indexOf(escaped) !== -1) {\n on_load()\n continue;\n }\n const element = document.createElement(\"link\");\n element.onload = on_load;\n element.onerror = on_error;\n element.rel = \"stylesheet\";\n element.type = \"text/css\";\n element.href = url;\n console.debug(\"Bokeh: injecting link tag for BokehJS stylesheet: \", url);\n document.body.appendChild(element);\n } if (((window.Tabulator !== undefined) && (!(window.Tabulator instanceof HTMLElement))) || window.requirejs) {\n var urls = ['https://cdn.holoviz.org/panel/1.8.7/dist/bundled/datatabulator/tabulator-tables@6.3.1/dist/js/tabulator.min.js'];\n for (var i = 0; i < urls.length; i++) {\n skip.push(encodeURI(urls[i]))\n }\n } if (((window.moment !== undefined) && (!(window.moment instanceof HTMLElement))) || window.requirejs) {\n var urls = ['https://cdn.holoviz.org/panel/1.8.7/dist/bundled/datatabulator/luxon/build/global/luxon.min.js'];\n for (var i = 0; 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"text": [
"Number of density points larger than number of shells. Assuming inner point irrelevant\n"
]
},
{
"name": "stderr",
"output_type": "stream",
"text": [
"model_isotope_time_0 is not set in the configuration. Isotopic mass fractions will not be decayed and is assumed to be correct for the time_explosion. THIS IS NOT RECOMMENDED!\n"
]
},
{
"name": "stderr",
"output_type": "stream",
"text": [
"/home/aryaatharva18/tardis-main/tardis/tardis/opacities/macro_atom/macroatom_solver.py:624: FutureWarning:\n",
"\n",
"DataFrameGroupBy.apply operated on the grouping columns. This behavior is deprecated, and in a future version of pandas the grouping columns will be excluded from the operation. Either pass `include_groups=False` to exclude the groupings or explicitly select the grouping columns after groupby to silence this warning.\n",
"\n"
]
},
{
"name": "stderr",
"output_type": "stream",
"text": [
"/home/aryaatharva18/tardis-main/tardis/tardis/transport/montecarlo/modes/classic/montecarlo_transport.py:161: NumbaTypeSafetyWarning:\n",
"\n",
"\u001b[1m\u001b[1m\u001b[1munsafe cast from uint64 to int64. Precision may be lost.\u001b[0m\u001b[0m\u001b[0m\n",
"\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"JIT done\n"
]
}
],
"source": [
"# Run minimal sim to trigger JIT\n",
"import tardis\n",
"from tardis.io.configuration.config_reader import Configuration\n",
"from tardis.simulation import Simulation\n",
"\n",
"config = Configuration.from_yaml(os.path.join(\n",
" os.path.dirname(tardis.__file__),\n",
" \"io\", \"configuration\", \"tests\", \"data\", \"tardis_configv1_verysimple.yml\",\n",
"))\n",
"config[\"plasma\"][\"line_interaction_type\"] = \"downbranch\"\n",
"config[\"montecarlo\"][\"no_of_packets\"] = 100\n",
"config[\"montecarlo\"][\"last_no_of_packets\"] = 100\n",
"config[\"montecarlo\"][\"no_of_virtual_packets\"] = 0\n",
"config.atom_data = os.environ.get(\n",
" \"TARDIS_ATOM_DATA\",\n",
" os.path.expanduser(\"~/Downloads/tardis-data/kurucz_cd23_chianti_H_He.h5\"),\n",
")\n",
"sim = Simulation.from_config(config)\n",
"sim.iterate(no_of_packets=100, no_of_virtual_packets=0)\n",
"print(\"JIT done\")"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## IR for `line_scatter_event`\n",
"\n",
"After inlining, LLVM 15 keeps `fdiv 1.0, x` (reciprocal) then `fmul`.\n",
"LLVM 20 folds it into a single `fdiv y, x`. Look for `fdiv` instructions below."
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"execution": {
"iopub.execute_input": "2026-03-12T19:22:42.413589Z",
"iopub.status.busy": "2026-03-12T19:22:42.413080Z",
"iopub.status.idle": "2026-03-12T19:22:42.424289Z",
"shell.execute_reply": "2026-03-12T19:22:42.423454Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"FP ops: 52 total, 51 fast, 1 reduced-flags\n",
"\n",
"fdiv instructions:\n",
" %.30.i = fdiv fast double %0, %arg.time_explosion\n",
" %storemerge.i = fdiv reassoc arcp contract afn double %.7.i.i, %.15.i.i\n",
" %.11.i.i.i = fdiv fast double 1.000000e+00, %.7.i.i10\n",
" %.15.i.i.i = fdiv fast double %.7.i2.i, %sqrt.i.i7\n",
" %.22.i.i = fdiv fast double %.126, %.9.i.i\n",
" %.29.i.i = fdiv fast double %.23.i.i, %.25.i.i\n",
" %.30.i3 = fdiv fast double %3, %arg.time_explosion\n",
" %.176 = fdiv fast double %storemerge.i, %.7.i.i10\n",
" %.17618 = fdiv fast double %4, %sqrt.i.i7\n",
" %.30.i.i = fdiv fast double %1, %arg.time_explosion\n",
" %.11.i.i.i = fdiv fast double 1.000000e+00, %.7.i.i.i\n",
" %.15.i.i.i = fdiv fast double %.7.i2.i.i, %sqrt.i.i.i\n",
" %.22.i.i = fdiv fast double %.54.i, %.9.i.i\n",
" %.29.i.i = fdiv fast double %.23.i.i, %.25.i.i\n"
]
}
],
"source": [
"from tardis.transport.montecarlo.interaction_event_callers import line_scatter_event\n",
"\n",
"sig = line_scatter_event.signatures[0]\n",
"ir = line_scatter_event.inspect_llvm(sig)\n",
"\n",
"arith_re = re.compile(\n",
" r'^\\s+(%.+)\\s*=\\s*(fmul|fadd|fsub|fdiv|fneg|call.*(?:sqrt|fma))\\s+(.+)$',\n",
" re.MULTILINE,\n",
")\n",
"ops = arith_re.findall(ir)\n",
"fast_n = sum(1 for _, _, r in ops if r.startswith('fast'))\n",
"reassoc_n = sum(1 for _, _, r in ops if r.startswith('reassoc'))\n",
"\n",
"print(f\"FP ops: {len(ops)} total, {fast_n} fast, {reassoc_n} reduced-flags\")\n",
"print()\n",
"print(\"fdiv instructions:\")\n",
"for name, op, rest in ops:\n",
" if op == 'fdiv':\n",
" print(f\" {name} = {op} {rest}\")"
]
},
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{
"name": "stdout",
"output_type": "stream",
"text": [
"--- IR line 103 ---\n",
" 101: %.55 = zext i1 %.13 to i8\n",
" 102: %0 = fmul fast double %.39, 0x3DC2567F4ED09FE8\n",
">>> 103: %.30.i = fdiv fast double %0, %arg.time_explosion\n",
" 104: %.6.i.i = fmul fast double %.30.i, %.48\n",
" 105: %.7.i.i = fsub fast double 1.000000e+00, %.6.i.i\n",
"\n",
"--- IR line 110 ---\n",
" 108: %sqrt.i.i = tail call fast double @llvm.sqrt.f64(double %.10.i.i)\n",
" 109: %.15.i.i = select i1 %.13, double %sqrt.i.i, double 1.000000e+00\n",
">>> 110: %storemerge.i = fdiv reassoc arcp contract afn double %.7.i.i, %.15.i.i\n",
" 111: call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %.4.i)\n",
" 112: call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %excinfo.1.i)\n",
"\n",
"--- IR line 120 ---\n",
" 118: \n",
" 119: B60.endif.i.i: ; preds = %B0.endif.endif.endif\n",
">>> 120: %.11.i.i.i = fdiv fast double 1.000000e+00, %.7.i.i10\n",
" 121: br label %B36.endif.i\n",
" 122: \n",
"\n",
"--- IR line 124 ---\n",
" 122: \n",
" 123: B82.endif.i.i: ; preds = %B0.endif.endif.endif.thread\n",
">>> 124: %.15.i.i.i = fdiv fast double %.7.i2.i, %sqrt.i.i7\n",
" 125: br label %B36.endif.i\n",
" 126: \n",
"\n",
"--- IR line 155 ---\n",
" 153: B182.endif.i: ; preds = %B36.endif.i\n",
" 154: %.9.i.i = fmul fast double %arg.time_explosion, 0x421BEB9BF3A00000\n",
">>> 155: %.22.i.i = fdiv fast double %.126, %.9.i.i\n",
" 156: %.23.i.i = fadd fast double %.22.i.i, %.31.i\n",
" 157: %.24.i.i = fmul fast double %.22.i.i, %.31.i\n",
"\n",
"--- IR line 159 ---\n",
" 157: %.24.i.i = fmul fast double %.22.i.i, %.31.i\n",
" 158: %.25.i.i = fadd fast double %.24.i.i, 1.000000e+00\n",
">>> 159: %.29.i.i = fdiv fast double %.23.i.i, %.25.i.i\n",
" 160: %sunkaddr = getelementptr inbounds i8, ptr %arg.r_packet.1, i64 8\n",
" 161: store double %.29.i.i, ptr %sunkaddr, align 8, !noalias !25\n",
"\n",
"--- IR line 201 ---\n",
" 199: %.126 = load double, ptr %arg.r_packet.1, align 8\n",
" 200: %3 = fmul fast double %.126, 0x3DC2567F4ED09FE8\n",
">>> 201: %.30.i3 = fdiv fast double %3, %arg.time_explosion\n",
" 202: %.6.i.i4 = fmul fast double %.30.i3, %.31.i\n",
" 203: br i1 %2, label %B0.endif.endif.endif.thread, label %B0.endif.endif.endif\n",
"\n",
"--- IR line 219 ---\n",
" 217: %.173 = getelementptr inbounds nuw i8, ptr %arg.r_packet.1, i64 24\n",
" 218: %.174 = load double, ptr %.173, align 8\n",
">>> 219: %.176 = fdiv fast double %storemerge.i, %.7.i.i10\n",
" 220: %.178 = fmul fast double %.174, %.176\n",
" 221: store double %.178, ptr %.173, align 8\n",
"\n",
"--- IR line 233 ---\n",
" 231: %.17417 = load double, ptr %.17316, align 8\n",
" 232: %4 = fmul fast double %.7.i2.i, %storemerge.i\n",
">>> 233: %.17618 = fdiv fast double %4, %sqrt.i.i7\n",
" 234: %.17819 = fmul fast double %.17417, %.17618\n",
" 235: store double %.17819, ptr %.17316, align 8\n",
"\n",
"--- IR line 714 ---\n",
" 712: %.63.i = load double, ptr %.62.i, align 8, !noalias !31\n",
" 713: %1 = fmul fast double %.54.i, 0x3DC2567F4ED09FE8\n",
">>> 714: %.30.i.i = fdiv fast double %1, %arg.time_explosion\n",
" 715: %.6.i.i.i = fmul fast double %.30.i.i, %.63.i\n",
" 716: br i1 %0, label %B60.endif.i.i, label %B82.endif.i.i\n",
"\n",
"--- IR line 720 ---\n",
" 718: B60.endif.i.i: ; preds = %B528\n",
" 719: %.7.i.i.i = fsub fast double 1.000000e+00, %.6.i.i.i\n",
">>> 720: %.11.i.i.i = fdiv fast double 1.000000e+00, %.7.i.i.i\n",
" 721: br label %B36.endif.i\n",
" 722: \n",
"\n",
"--- IR line 728 ---\n",
" 726: %.10.i.i.i = fsub fast double 1.000000e+00, %.8.i.i.i\n",
" 727: %sqrt.i.i.i = tail call fast double @llvm.sqrt.f64(double %.10.i.i.i)\n",
">>> 728: %.15.i.i.i = fdiv fast double %.7.i2.i.i, %sqrt.i.i.i\n",
" 729: br label %B36.endif.i\n",
" 730: \n",
"\n",
"--- IR line 758 ---\n",
" 756: B182.endif.i: ; preds = %B36.endif.i\n",
" 757: %.9.i.i = fmul fast double %arg.time_explosion, 0x421BEB9BF3A00000\n",
">>> 758: %.22.i.i = fdiv fast double %.54.i, %.9.i.i\n",
" 759: %.23.i.i = fadd fast double %.22.i.i, %.63.i\n",
" 760: %.24.i.i = fmul fast double %.22.i.i, %.63.i\n",
"\n",
"--- IR line 762 ---\n",
" 760: %.24.i.i = fmul fast double %.22.i.i, %.63.i\n",
" 761: %.25.i.i = fadd fast double %.24.i.i, 1.000000e+00\n",
">>> 762: %.29.i.i = fdiv fast double %.23.i.i, %.25.i.i\n",
" 763: %sunkaddr = getelementptr inbounds i8, ptr %arg.r_packet.1, i64 8\n",
" 764: store double %.29.i.i, ptr %sunkaddr, align 8, !noalias !31\n",
"\n"
]
}
],
"source": [
"# Show context around each fdiv\n",
"lines = ir.split('\\n')\n",
"for i, line in enumerate(lines):\n",
" if 'fdiv' in line and '=' in line:\n",
" start, end = max(0, i - 2), min(len(lines), i + 3)\n",
" print(f\"--- IR line {i+1} ---\")\n",
" for j in range(start, end):\n",
" m = \">>>\" if j == i else \" \"\n",
" print(f\"{m} {j+1:5d}: {lines[j]}\")\n",
" print()"
]
}
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