Implementation notes: amd64, skylake, crypto_dh/ed521gs

Computer: skylake
Architecture: amd64
CPU ID: GenuineIntel-000506e3-bfebfbff
SUPERCOP version: 20161026
Operation: crypto_dh
Primitive: ed521gs

Time	Implementation	Compiler	Benchmark date	SUPERCOP version
3201072	`ref`	`gcc -march=native -mtune=native -Os -fomit-frame-pointer -fwrapv`	20161217	20161026
3281060	`ref`	`clang -O3 -fwrapv -march=native -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
3289226	`ref`	`clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments`	20161217	20161026
3364222	`ref`	`gcc -march=native -mtune=native -O3 -fomit-frame-pointer -fwrapv`	20161217	20161026
3384154	`ref`	`clang -O3 -fwrapv -mavx2 -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
3388988	`ref`	`gcc -funroll-loops -march=k8 -O3 -fomit-frame-pointer`	20161217	20161026
3396950	`ref`	`gcc -funroll-loops -m64 -march=k8 -O3 -fomit-frame-pointer`	20161217	20161026
3396998	`ref`	`gcc -m64 -march=k8 -O3 -fomit-frame-pointer`	20161217	20161026
3401306	`ref`	`gcc -march=barcelona -O3 -fomit-frame-pointer`	20161217	20161026
3403152	`ref`	`gcc -funroll-loops -m64 -O3 -fomit-frame-pointer`	20161217	20161026
3403956	`ref`	`gcc -funroll-loops -fno-schedule-insns -O3 -fomit-frame-pointer`	20161217	20161026
3405010	`ref`	`gcc -funroll-loops -m64 -march=barcelona -O3 -fomit-frame-pointer`	20161217	20161026
3406558	`ref`	`gcc -m64 -march=barcelona -O3 -fomit-frame-pointer`	20161217	20161026
3412338	`ref`	`gcc -march=k8 -O3 -fomit-frame-pointer`	20161217	20161026
3417526	`ref`	`gcc -m64 -march=k8 -Os -fomit-frame-pointer`	20161217	20161026
3418484	`ref`	`gcc -fno-schedule-insns -O3 -fomit-frame-pointer`	20161217	20161026
3418520	`ref`	`gcc -O3 -fomit-frame-pointer`	20161217	20161026
3420026	`ref`	`gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv`	20161217	20161026
3425126	`ref`	`gcc -m64 -march=barcelona -Os -fomit-frame-pointer`	20161217	20161026
3425382	`ref`	`gcc -m64 -march=corei7 -O3 -fomit-frame-pointer`	20161217	20161026
3425608	`ref`	`gcc -m64 -march=core-avx2 -O3 -fomit-frame-pointer`	20161217	20161026
3425946	`ref`	`gcc -m64 -march=core2 -msse4.1 -O3 -fomit-frame-pointer`	20161217	20161026
3426786	`ref`	`gcc -m64 -march=core-avx-i -O3 -fomit-frame-pointer`	20161217	20161026
3426892	`ref`	`gcc -march=k8 -Os -fomit-frame-pointer`	20161217	20161026
3426896	`ref`	`gcc -Os -fomit-frame-pointer`	20161217	20161026
3428078	`ref`	`gcc -march=barcelona -Os -fomit-frame-pointer`	20161217	20161026
3429694	`ref`	`gcc -m64 -march=corei7 -Os -fomit-frame-pointer`	20161217	20161026
3429792	`ref`	`gcc -m64 -march=core2 -msse4 -O3 -fomit-frame-pointer`	20161217	20161026
3430156	`ref`	`gcc -m64 -march=core2 -Os -fomit-frame-pointer`	20161217	20161026
3430596	`ref`	`gcc -m64 -march=core2 -msse4 -Os -fomit-frame-pointer`	20161217	20161026
3430838	`ref`	`gcc -m64 -march=corei7-avx -Os -fomit-frame-pointer`	20161217	20161026
3430888	`ref`	`gcc -m64 -march=core2 -msse4.1 -Os -fomit-frame-pointer`	20161217	20161026
3431174	`ref`	`gcc -m64 -march=nocona -Os -fomit-frame-pointer`	20161217	20161026
3431244	`ref`	`gcc -m64 -march=core-avx-i -Os -fomit-frame-pointer`	20161217	20161026
3431994	`ref`	`gcc -fno-schedule-insns -Os -fomit-frame-pointer`	20161217	20161026
3432146	`ref`	`gcc -m64 -march=native -mtune=native -Os -fomit-frame-pointer`	20161217	20161026
3432472	`ref`	`gcc -m64 -march=core-avx2 -Os -fomit-frame-pointer`	20161217	20161026
3434116	`ref`	`gcc -m64 -Os -fomit-frame-pointer`	20161217	20161026
3438168	`ref`	`gcc -m64 -O3 -fomit-frame-pointer`	20161217	20161026
3440174	`ref`	`gcc -funroll-loops -m64 -march=k8 -Os -fomit-frame-pointer`	20161217	20161026
3440216	`ref`	`gcc -funroll-loops -march=k8 -Os -fomit-frame-pointer`	20161217	20161026
3440564	`ref`	`gcc -m64 -march=core2 -O3 -fomit-frame-pointer`	20161217	20161026
3444654	`ref`	`gcc -funroll-loops -march=barcelona -Os -fomit-frame-pointer`	20161217	20161026
3444854	`ref`	`gcc -funroll-loops -m64 -march=barcelona -Os -fomit-frame-pointer`	20161217	20161026
3447254	`ref`	`gcc -funroll-loops -Os -fomit-frame-pointer`	20161217	20161026
3447370	`ref`	`gcc -funroll-loops -fno-schedule-insns -Os -fomit-frame-pointer`	20161217	20161026
3449924	`ref`	`clang -O3 -fwrapv -mavx -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
3452614	`ref`	`gcc -funroll-loops -march=nocona -O3 -fomit-frame-pointer`	20161217	20161026
3453764	`ref`	`gcc -funroll-loops -m64 -Os -fomit-frame-pointer`	20161217	20161026
3455278	`ref`	`gcc -funroll-loops -O3 -fomit-frame-pointer`	20161217	20161026
3456010	`ref`	`gcc -funroll-loops -m64 -march=nocona -Os -fomit-frame-pointer`	20161217	20161026
3462882	`ref`	`gcc -m64 -march=nocona -O3 -fomit-frame-pointer`	20161217	20161026
3463302	`ref`	`gcc -funroll-loops -march=k8 -O2 -fomit-frame-pointer`	20161217	20161026
3465186	`ref`	`gcc -funroll-loops -m64 -march=barcelona -O2 -fomit-frame-pointer`	20161217	20161026
3467818	`ref`	`gcc -funroll-loops -m64 -march=nocona -O3 -fomit-frame-pointer`	20161217	20161026
3468152	`ref`	`gcc -march=nocona -O3 -fomit-frame-pointer`	20161217	20161026
3468208	`ref`	`gcc -m64 -march=corei7-avx -O3 -fomit-frame-pointer`	20161217	20161026
3469836	`ref`	`gcc -funroll-loops -march=barcelona -O2 -fomit-frame-pointer`	20161217	20161026
3471808	`ref`	`gcc -funroll-loops -march=nocona -Os -fomit-frame-pointer`	20161217	20161026
3472794	`ref`	`clang -O3 -fwrapv -mavx -maes -mpclmul -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
3473208	`ref`	`gcc -march=k8 -O2 -fomit-frame-pointer`	20161217	20161026
3473532	`ref`	`gcc -m64 -march=barcelona -O2 -fomit-frame-pointer`	20161217	20161026
3473618	`ref`	`gcc -march=nocona -Os -fomit-frame-pointer`	20161217	20161026
3482916	`ref`	`gcc -m64 -march=k8 -O2 -fomit-frame-pointer`	20161217	20161026
3483072	`ref`	`gcc -march=barcelona -O2 -fomit-frame-pointer`	20161217	20161026
3484802	`ref`	`gcc -m64 -march=native -mtune=native -O3 -fomit-frame-pointer`	20161217	20161026
3485152	`ref`	`gcc -funroll-loops -m64 -O2 -fomit-frame-pointer`	20161217	20161026
3488528	`ref`	`gcc -funroll-loops -O2 -fomit-frame-pointer`	20161217	20161026
3490174	`ref`	`clang -O3 -fwrapv -march=x86-64 -mcpu=core-avx2 -mavx2 -maes -mpclmul -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
3490502	`ref`	`gcc -m64 -march=core-avx2 -O2 -fomit-frame-pointer`	20161217	20161026
3492198	`ref`	`gcc -funroll-loops -m64 -march=k8 -O2 -fomit-frame-pointer`	20161217	20161026
3496590	`ref`	`gcc -m64 -march=native -mtune=native -O2 -fomit-frame-pointer`	20161217	20161026
3498004	`ref`	`gcc -funroll-loops -march=barcelona -O3 -fomit-frame-pointer`	20161217	20161026
3502758	`ref`	`gcc -m64 -march=corei7 -O2 -fomit-frame-pointer`	20161217	20161026
3505124	`ref`	`gcc -m64 -march=corei7-avx -O2 -fomit-frame-pointer`	20161217	20161026
3506702	`ref`	`gcc -O2 -fomit-frame-pointer`	20161217	20161026
3506704	`ref`	`gcc -m64 -march=core-avx-i -O2 -fomit-frame-pointer`	20161217	20161026
3508654	`ref`	`gcc -m64 -march=core2 -O2 -fomit-frame-pointer`	20161217	20161026
3509952	`ref`	`gcc -m64 -march=core2 -msse4.1 -O2 -fomit-frame-pointer`	20161217	20161026
3510448	`ref`	`gcc -funroll-loops -fno-schedule-insns -O2 -fomit-frame-pointer`	20161217	20161026
3514918	`ref`	`gcc -m64 -O2 -fomit-frame-pointer`	20161217	20161026
3515440	`ref`	`gcc -fno-schedule-insns -O2 -fomit-frame-pointer`	20161217	20161026
3520294	`ref`	`gcc -funroll-loops -march=nocona -O2 -fomit-frame-pointer`	20161217	20161026
3520362	`ref`	`clang -O3 -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
3521636	`ref`	`clang -mcpu=cortex-a9 -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments`	20161217	20161026
3523684	`ref`	`gcc -march=nocona -O2 -fomit-frame-pointer`	20161217	20161026
3550804	`ref`	`gcc -m64 -march=nocona -O2 -fomit-frame-pointer`	20161217	20161026
3557688	`ref`	`gcc -m64 -march=core2 -msse4 -O2 -fomit-frame-pointer`	20161217	20161026
3564664	`ref`	`clang -mcpu=native -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments`	20161217	20161026
3590158	`ref`	`gcc -funroll-loops -m64 -march=nocona -O2 -fomit-frame-pointer`	20161217	20161026
3610754	`ref`	`clang -mcpu=cortex-a8 -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments`	20161217	20161026
5545596	`ref`	`gcc -funroll-loops -march=barcelona -O -fomit-frame-pointer`	20161217	20161026
5561634	`ref`	`gcc -funroll-loops -march=k8 -O -fomit-frame-pointer`	20161217	20161026
5567468	`ref`	`gcc -march=k8 -O -fomit-frame-pointer`	20161217	20161026
5572820	`ref`	`gcc -m64 -march=barcelona -O -fomit-frame-pointer`	20161217	20161026
5574028	`ref`	`gcc -funroll-loops -m64 -march=barcelona -O -fomit-frame-pointer`	20161217	20161026
5601292	`ref`	`gcc -funroll-loops -m64 -march=k8 -O -fomit-frame-pointer`	20161217	20161026
5608242	`ref`	`gcc -march=barcelona -O -fomit-frame-pointer`	20161217	20161026
5651628	`ref`	`gcc -funroll-loops -m64 -march=nocona -O -fomit-frame-pointer`	20161217	20161026
5663534	`ref`	`gcc -m64 -march=k8 -O -fomit-frame-pointer`	20161217	20161026
5667838	`ref`	`gcc -m64 -march=nocona -O -fomit-frame-pointer`	20161217	20161026
5670812	`ref`	`gcc -funroll-loops -O -fomit-frame-pointer`	20161217	20161026
5671100	`ref`	`gcc -funroll-loops -fno-schedule-insns -O -fomit-frame-pointer`	20161217	20161026
5671350	`ref`	`gcc -funroll-loops -march=nocona -O -fomit-frame-pointer`	20161217	20161026
5675896	`ref`	`gcc -funroll-loops -m64 -O -fomit-frame-pointer`	20161217	20161026
5677542	`ref`	`gcc -march=nocona -O -fomit-frame-pointer`	20161217	20161026
5677916	`ref`	`gcc -m64 -march=corei7-avx -O -fomit-frame-pointer`	20161217	20161026
5681172	`ref`	`gcc -O -fomit-frame-pointer`	20161217	20161026
5682142	`ref`	`gcc -fno-schedule-insns -O -fomit-frame-pointer`	20161217	20161026
5697192	`ref`	`gcc -m64 -O -fomit-frame-pointer`	20161217	20161026
5698150	`ref`	`gcc -m64 -march=core2 -msse4 -O -fomit-frame-pointer`	20161217	20161026
5700424	`ref`	`gcc -m64 -march=core2 -O -fomit-frame-pointer`	20161217	20161026
5707970	`ref`	`gcc -m64 -march=corei7 -O -fomit-frame-pointer`	20161217	20161026
5762356	`ref`	`gcc -m64 -march=core-avx-i -O -fomit-frame-pointer`	20161217	20161026
5784168	`ref`	`gcc -march=native -mtune=native -O -fomit-frame-pointer -fwrapv`	20161217	20161026
5788926	`ref`	`gcc -m64 -march=core2 -msse4.1 -O -fomit-frame-pointer`	20161217	20161026
5820840	`ref`	`gcc -m64 -march=core-avx2 -O -fomit-frame-pointer`	20161217	20161026
5870256	`ref`	`gcc -m64 -march=native -mtune=native -O -fomit-frame-pointer`	20161217	20161026
13197728	`ref`	`cc`	20161217	20161026
13206388	`ref`	`gcc -funroll-loops`	20161217	20161026
13225758	`ref`	`gcc`	20161217	20161026

Compiler output

Implementation: crypto_dh/ed521gs/ref
Compiler: cc

Number of similar (compiler,implementation) pairs: 107, namely:

Compiler	Implementations
cc	ref
gcc	ref
gcc -O2 -fomit-frame-pointer	ref
gcc -O3 -fomit-frame-pointer	ref
gcc -O -fomit-frame-pointer	ref
gcc -Os -fomit-frame-pointer	ref
gcc -fno-schedule-insns -O2 -fomit-frame-pointer	ref
gcc -fno-schedule-insns -O3 -fomit-frame-pointer	ref
gcc -fno-schedule-insns -O -fomit-frame-pointer	ref
gcc -fno-schedule-insns -Os -fomit-frame-pointer	ref
gcc -funroll-loops	ref
gcc -funroll-loops -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -O -fomit-frame-pointer	ref
gcc -funroll-loops -Os -fomit-frame-pointer	ref
gcc -funroll-loops -fno-schedule-insns -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -fno-schedule-insns -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -fno-schedule-insns -O -fomit-frame-pointer	ref
gcc -funroll-loops -fno-schedule-insns -Os -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -O -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -Os -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=barcelona -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=barcelona -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=barcelona -O -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=barcelona -Os -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=k8 -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=k8 -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=k8 -O -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=k8 -Os -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=nocona -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=nocona -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=nocona -O -fomit-frame-pointer	ref
gcc -funroll-loops -m64 -march=nocona -Os -fomit-frame-pointer	ref
gcc -funroll-loops -march=barcelona -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -march=barcelona -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -march=barcelona -O -fomit-frame-pointer	ref
gcc -funroll-loops -march=barcelona -Os -fomit-frame-pointer	ref
gcc -funroll-loops -march=k8 -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -march=k8 -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -march=k8 -O -fomit-frame-pointer	ref
gcc -funroll-loops -march=k8 -Os -fomit-frame-pointer	ref
gcc -funroll-loops -march=nocona -O2 -fomit-frame-pointer	ref
gcc -funroll-loops -march=nocona -O3 -fomit-frame-pointer	ref
gcc -funroll-loops -march=nocona -O -fomit-frame-pointer	ref
gcc -funroll-loops -march=nocona -Os -fomit-frame-pointer	ref
gcc -m64 -O2 -fomit-frame-pointer	ref
gcc -m64 -O3 -fomit-frame-pointer	ref
gcc -m64 -O -fomit-frame-pointer	ref
gcc -m64 -Os -fomit-frame-pointer	ref
gcc -m64 -march=core-avx-i -O2 -fomit-frame-pointer	ref
gcc -m64 -march=core-avx-i -O3 -fomit-frame-pointer	ref
gcc -m64 -march=core-avx-i -O -fomit-frame-pointer	ref
gcc -m64 -march=core-avx-i -Os -fomit-frame-pointer	ref
gcc -m64 -march=core-avx2 -O2 -fomit-frame-pointer	ref
gcc -m64 -march=core-avx2 -O3 -fomit-frame-pointer	ref
gcc -m64 -march=core-avx2 -O -fomit-frame-pointer	ref
gcc -m64 -march=core-avx2 -Os -fomit-frame-pointer	ref
gcc -m64 -march=core2 -O2 -fomit-frame-pointer	ref
gcc -m64 -march=core2 -O3 -fomit-frame-pointer	ref
gcc -m64 -march=core2 -O -fomit-frame-pointer	ref
gcc -m64 -march=core2 -Os -fomit-frame-pointer	ref
gcc -m64 -march=core2 -msse4.1 -O2 -fomit-frame-pointer	ref
gcc -m64 -march=core2 -msse4.1 -O3 -fomit-frame-pointer	ref
gcc -m64 -march=core2 -msse4.1 -O -fomit-frame-pointer	ref
gcc -m64 -march=core2 -msse4.1 -Os -fomit-frame-pointer	ref
gcc -m64 -march=core2 -msse4 -O2 -fomit-frame-pointer	ref
gcc -m64 -march=core2 -msse4 -O3 -fomit-frame-pointer	ref
gcc -m64 -march=core2 -msse4 -O -fomit-frame-pointer	ref
gcc -m64 -march=core2 -msse4 -Os -fomit-frame-pointer	ref
gcc -m64 -march=corei7-avx -O2 -fomit-frame-pointer	ref
gcc -m64 -march=corei7-avx -O3 -fomit-frame-pointer	ref
gcc -m64 -march=corei7-avx -O -fomit-frame-pointer	ref
gcc -m64 -march=corei7-avx -Os -fomit-frame-pointer	ref
gcc -m64 -march=corei7 -O2 -fomit-frame-pointer	ref
gcc -m64 -march=corei7 -O3 -fomit-frame-pointer	ref
gcc -m64 -march=corei7 -O -fomit-frame-pointer	ref
gcc -m64 -march=corei7 -Os -fomit-frame-pointer	ref
gcc -m64 -march=k8 -O2 -fomit-frame-pointer	ref
gcc -m64 -march=k8 -O3 -fomit-frame-pointer	ref
gcc -m64 -march=k8 -O -fomit-frame-pointer	ref
gcc -m64 -march=k8 -Os -fomit-frame-pointer	ref
gcc -m64 -march=native -mtune=native -O2 -fomit-frame-pointer	ref
gcc -m64 -march=native -mtune=native -O3 -fomit-frame-pointer	ref
gcc -m64 -march=native -mtune=native -O -fomit-frame-pointer	ref
gcc -m64 -march=native -mtune=native -Os -fomit-frame-pointer	ref
gcc -m64 -march=nocona -O2 -fomit-frame-pointer	ref
gcc -m64 -march=nocona -O3 -fomit-frame-pointer	ref
gcc -m64 -march=nocona -O -fomit-frame-pointer	ref
gcc -m64 -march=nocona -Os -fomit-frame-pointer	ref
gcc -march=barcelona -O2 -fomit-frame-pointer	ref
gcc -march=barcelona -O3 -fomit-frame-pointer	ref
gcc -march=barcelona -O -fomit-frame-pointer	ref
gcc -march=barcelona -Os -fomit-frame-pointer	ref
gcc -march=k8 -O2 -fomit-frame-pointer	ref
gcc -march=k8 -O3 -fomit-frame-pointer	ref
gcc -march=k8 -O -fomit-frame-pointer	ref
gcc -march=k8 -Os -fomit-frame-pointer	ref
gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv	ref
gcc -march=native -mtune=native -O3 -fomit-frame-pointer -fwrapv	ref
gcc -march=native -mtune=native -O -fomit-frame-pointer -fwrapv	ref
gcc -march=native -mtune=native -Os -fomit-frame-pointer -fwrapv	ref
gcc -march=nocona -O2 -fomit-frame-pointer	ref
gcc -march=nocona -O3 -fomit-frame-pointer	ref
gcc -march=nocona -O -fomit-frame-pointer	ref
gcc -march=nocona -Os -fomit-frame-pointer	ref

Compiler output

Implementation: crypto_dh/ed521gs/ref
Compiler: clang -O3 -fomit-frame-pointer -Qunused-arguments

dh.c: dh.c:771:2: warning: implicit declaration of function 'randombytes' is invalid in C99 [-Wimplicit-function-declaration]
dh.c: randombytes(sk,PANES-1);
dh.c: ^
dh.c: 1 warning generated.

Number of similar (compiler,implementation) pairs: 10, namely:

Compiler	Implementations
clang -O3 -fomit-frame-pointer -Qunused-arguments	ref
clang -O3 -fwrapv -march=native -fomit-frame-pointer -Qunused-arguments	ref
clang -O3 -fwrapv -march=x86-64 -mcpu=core-avx2 -mavx2 -maes -mpclmul -fomit-frame-pointer -Qunused-arguments	ref
clang -O3 -fwrapv -mavx2 -fomit-frame-pointer -Qunused-arguments	ref
clang -O3 -fwrapv -mavx -fomit-frame-pointer -Qunused-arguments	ref
clang -O3 -fwrapv -mavx -maes -mpclmul -fomit-frame-pointer -Qunused-arguments	ref
clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments	ref
clang -mcpu=cortex-a8 -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments	ref
clang -mcpu=cortex-a9 -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments	ref
clang -mcpu=native -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments	ref

Compiler output

Implementation: crypto_dh/ed521gs/ref
Compiler: gcc -m64 -march=barcelona -O2 -fomit-frame-pointer

dh.c: dh.c: In function 'crypto_dh_ed521gs_ref_keypair':
dh.c: dh.c:771:2: warning: implicit declaration of function 'randombytes' [-Wimplicit-function-declaration]
dh.c: randombytes(sk,PANES-1);
dh.c: ^~~~~~~~~~~
dh.c: dh.c: In function 'crypto_dh_ed521gs_ref_keypair':
dh.c: dh.c:771:2: warning: implicit declaration of function 'randombytes' [-Wimplicit-function-declaration]
dh.c: randombytes(sk,PANES-1);
dh.c: ^~~~~~~~~~~

Number of similar (compiler,implementation) pairs: 4, namely:

Compiler	Implementations
gcc -m64 -march=barcelona -O2 -fomit-frame-pointer	ref
gcc -m64 -march=barcelona -O3 -fomit-frame-pointer	ref
gcc -m64 -march=barcelona -O -fomit-frame-pointer	ref
gcc -m64 -march=barcelona -Os -fomit-frame-pointer	ref