add python script to format benchmark output; remove unneeded compile…

… flag for clang

benchformat.py

@@ -0,0 +1,46 @@
+"""
+Reads output of `cargo bench` from stdin
+Prints markdown-formatter tables on stdout
+"""
+
+from collections import defaultdict
+from tabulate import tabulate
+from sys import argv
+
+BENCHMARKED_LIBS = argv[1:]
+
+all_bench_data: defaultdict = defaultdict(lambda: defaultdict(defaultdict))
+
+while True:
+    try:
+        bench_res_line = input()
+    except EOFError:
+        break
+    if not bench_res_line.startswith("test bench_"):
+        continue
+    single_bench_res = bench_res_line.split()
+    [func, ftype, lib] = single_bench_res[1].removeprefix("bench_").rsplit("_", 2)
+    if lib not in BENCHMARKED_LIBS:
+        continue
+    runtime = single_bench_res[4]
+    all_bench_data[ftype][func][lib] = int(runtime.replace(",", ""))
+
+
+for ftype, bench_data in all_bench_data.items():
+    all_functions = sorted(bench_data.keys())
+    table = [
+        [f"`{func}`"] + [bench_data[func].get(lib, None) for lib in BENCHMARKED_LIBS]
+        for func in all_functions
+    ]
+    table = [
+        row[:1]
+        + [
+            f"`{res:,}`" if res == min(bench_data[func].values()) else f"{res:,}"
+            for res in row[1:]
+        ]
+        for func, row in zip(all_functions, table)
+    ]
+    print(
+        tabulate(table, headers=[ftype] + BENCHMARKED_LIBS, tablefmt="github"),
+        end="\n\n",
+    )

build.rs

@@ -7,7 +7,6 @@ fn main() {
             .file("benches/cpp/vclbench.cpp")
             .flag("-march=native")
             .flag("-Ofast")
-            .flag("-fveclib=libmvec")
             .std("c++17")
             .compile("vclbench");
     }