[libcxx-commits] [libcxx] [libc++] std::cmp_less and other integer comparison functions could be improved (PR #151332)
via libcxx-commits
libcxx-commits at lists.llvm.org
Mon Sep 15 21:51:32 PDT 2025
kisuhorikka wrote:
| --------------------------------------------------------------------
| Benchmark Time CPU Iterations
| --------------------------------------------------------------------
| BM_CmpEqual_schar_schar 0.221 ns 0.221 ns 3170066917
| BM_CmpEqual_schar_uchar 0.232 ns 0.232 ns 3025025997
| BM_CmpEqual_schar_short 0.280 ns 0.280 ns 2507488723
| BM_CmpEqual_schar_ushort 0.361 ns 0.361 ns 2086768552
| BM_CmpEqual_schar_int 0.220 ns 0.220 ns 3123871432
| BM_CmpEqual_schar_uint 0.233 ns 0.233 ns 3023305113
| BM_CmpEqual_uchar_schar 0.221 ns 0.221 ns 3180711887
| BM_CmpEqual_uchar_uchar 0.220 ns 0.220 ns 3177773411
| BM_CmpEqual_uchar_short 0.221 ns 0.221 ns 3178208863
| BM_CmpEqual_uchar_ushort 0.295 ns 0.295 ns 2331090257
| BM_CmpEqual_uchar_int 0.221 ns 0.221 ns 3156844998
| BM_CmpEqual_uchar_uint 0.220 ns 0.220 ns 3169867220
| BM_CmpEqual_short_schar 0.662 ns 0.662 ns 1057277878
| BM_CmpEqual_short_uchar 0.232 ns 0.232 ns 3019119818
| BM_CmpEqual_short_short 0.222 ns 0.222 ns 3171932178
| BM_CmpEqual_short_ushort 0.282 ns 0.282 ns 2495630490
| BM_CmpEqual_short_int 0.221 ns 0.221 ns 3165298446
| BM_CmpEqual_short_uint 0.368 ns 0.368 ns 2151247764
| BM_CmpEqual_ushort_schar 0.280 ns 0.280 ns 2503964124
| BM_CmpEqual_ushort_uchar 0.221 ns 0.221 ns 3164632430
| BM_CmpEqual_ushort_short 0.281 ns 0.281 ns 2502613193
| BM_CmpEqual_ushort_ushort 0.221 ns 0.221 ns 3164295092
| BM_CmpEqual_ushort_int 0.221 ns 0.221 ns 3170047435
| BM_CmpEqual_ushort_uint 0.222 ns 0.222 ns 3172795286
| BM_CmpEqual_int_schar 0.221 ns 0.221 ns 3170067649
| BM_CmpEqual_int_uchar 0.221 ns 0.221 ns 3162764124
| BM_CmpEqual_int_short 0.222 ns 0.222 ns 3149384461
| BM_CmpEqual_int_ushort 0.221 ns 0.221 ns 3170863296
| BM_CmpEqual_int_int 0.221 ns 0.221 ns 3173623511
| BM_CmpEqual_int_uint 0.349 ns 0.349 ns 2074548798
| BM_CmpEqual_uint_schar 0.221 ns 0.221 ns 3172609898
| BM_CmpEqual_uint_uchar 0.221 ns 0.221 ns 3167865061
| BM_CmpEqual_uint_short 0.221 ns 0.221 ns 3166421901
| BM_CmpEqual_uint_ushort 0.221 ns 0.221 ns 3154601627
| BM_CmpEqual_uint_int 0.222 ns 0.222 ns 3170922460
| BM_CmpEqual_uint_uint 0.221 ns 0.221 ns 3178919527
| BM_CmpLess_schar_schar 0.220 ns 0.220 ns 3166946919
| BM_CmpLess_schar_uchar 0.328 ns 0.328 ns 1989530669
| BM_CmpLess_schar_short 0.280 ns 0.280 ns 2481635006
| BM_CmpLess_schar_ushort 0.280 ns 0.280 ns 2494961754
| BM_CmpLess_schar_int 0.221 ns 0.221 ns 3170387379
| BM_CmpLess_schar_uint 0.232 ns 0.232 ns 3020929987
| BM_CmpLess_uchar_schar 0.339 ns 0.339 ns 2301816456
| BM_CmpLess_uchar_uchar 0.221 ns 0.221 ns 3168381752
| BM_CmpLess_uchar_short 0.221 ns 0.221 ns 3172130050
| BM_CmpLess_uchar_ushort 0.226 ns 0.226 ns 3177268420
| BM_CmpLess_uchar_int 0.221 ns 0.221 ns 3171207495
| BM_CmpLess_uchar_uint 0.221 ns 0.221 ns 3175834030
| BM_CmpLess_short_schar 0.663 ns 0.663 ns 1047532663
| BM_CmpLess_short_uchar 0.301 ns 0.301 ns 2210991543
| BM_CmpLess_short_short 0.220 ns 0.220 ns 3178165314
| BM_CmpLess_short_ushort 0.280 ns 0.280 ns 2502057388
| BM_CmpLess_short_int 0.223 ns 0.223 ns 3163647242
| BM_CmpLess_short_uint 0.233 ns 0.233 ns 3015274874
| BM_CmpLess_ushort_schar 0.280 ns 0.280 ns 2494740988
| BM_CmpLess_ushort_uchar 0.316 ns 0.316 ns 2124921107
| BM_CmpLess_ushort_short 0.280 ns 0.280 ns 2503617728
| BM_CmpLess_ushort_ushort 0.221 ns 0.221 ns 3166649427
| BM_CmpLess_ushort_int 0.221 ns 0.221 ns 3109921684
| BM_CmpLess_ushort_uint 0.221 ns 0.221 ns 3173252017
| BM_CmpLess_int_schar 0.222 ns 0.222 ns 3164772816
| BM_CmpLess_int_uchar 0.221 ns 0.221 ns 3141461765
| BM_CmpLess_int_short 0.221 ns 0.221 ns 3165358991
| BM_CmpLess_int_ushort 0.221 ns 0.221 ns 3172701309
| BM_CmpLess_int_int 0.222 ns 0.222 ns 3152883866
| BM_CmpLess_int_uint 0.232 ns 0.232 ns 2991786154
| BM_CmpLess_uint_schar 0.221 ns 0.221 ns 3174540447
| BM_CmpLess_uint_uchar 0.221 ns 0.220 ns 3177358990
| BM_CmpLess_uint_short 0.300 ns 0.300 ns 2362252788
| BM_CmpLess_uint_ushort 0.221 ns 0.221 ns 3178372133
| BM_CmpLess_uint_int 0.221 ns 0.221 ns 3177162541
| BM_CmpLess_uint_uint 0.221 ns 0.221 ns 3177473622
`-----------------------------
.---command stderr------------
| 2025-09-09T20:03:38+08:00
| Running /home/kisuhorikka/Source/llvm-project/build/libcxx/test/benchmarks/utility/Output/cmp.bench.cpp.dir/t.tmp.exe
| Run on (16 X 2304 MHz CPU s)
| CPU Caches:
| L1 Data 48 KiB (x8)
| L1 Instruction 32 KiB (x8)
| L2 Unified 1280 KiB (x8)
| L3 Unified 24576 KiB (x1)
| Load Average: 0.12, 0.25, 0.30
`-----------------------------
https://github.com/llvm/llvm-project/pull/151332
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