Implementation notes: amd64, skylake, crypto_dh/nist521gs

Computer: skylake
Architecture: amd64
CPU ID: GenuineIntel-000506e3-bfebfbff
SUPERCOP version: 20161026
Operation: crypto_dh
Primitive: nist521gs

Time	Implementation	Compiler	Benchmark date	SUPERCOP version
3737620	`ref`	`gcc -march=native -mtune=native -Os -fomit-frame-pointer -fwrapv`	20161217	20161026
3813444	`ref`	`gcc -march=native -mtune=native -O3 -fomit-frame-pointer -fwrapv`	20161217	20161026
3905886	`ref`	`gcc -funroll-loops -m64 -march=barcelona -O3 -fomit-frame-pointer`	20161217	20161026
3910802	`ref`	`gcc -funroll-loops -m64 -march=k8 -O3 -fomit-frame-pointer`	20161217	20161026
3911106	`ref`	`gcc -march=k8 -O3 -fomit-frame-pointer`	20161217	20161026
3913164	`ref`	`gcc -funroll-loops -march=k8 -O3 -fomit-frame-pointer`	20161217	20161026
3918806	`ref`	`gcc -funroll-loops -m64 -O3 -fomit-frame-pointer`	20161217	20161026
3919968	`ref`	`gcc -m64 -O3 -fomit-frame-pointer`	20161217	20161026
3923478	`ref`	`gcc -march=barcelona -O3 -fomit-frame-pointer`	20161217	20161026
3923812	`ref`	`gcc -funroll-loops -fno-schedule-insns -O3 -fomit-frame-pointer`	20161217	20161026
3924074	`ref`	`gcc -fno-schedule-insns -O3 -fomit-frame-pointer`	20161217	20161026
3924430	`ref`	`gcc -funroll-loops -march=barcelona -O3 -fomit-frame-pointer`	20161217	20161026
3925356	`ref`	`gcc -m64 -march=barcelona -O3 -fomit-frame-pointer`	20161217	20161026
3926388	`ref`	`gcc -m64 -march=core2 -msse4 -O3 -fomit-frame-pointer`	20161217	20161026
3929990	`ref`	`gcc -m64 -march=core2 -O3 -fomit-frame-pointer`	20161217	20161026
3931856	`ref`	`gcc -m64 -march=corei7 -O3 -fomit-frame-pointer`	20161217	20161026
3932116	`ref`	`gcc -m64 -march=core2 -msse4.1 -O3 -fomit-frame-pointer`	20161217	20161026
3932816	`ref`	`gcc -m64 -march=core-avx2 -O3 -fomit-frame-pointer`	20161217	20161026
3932834	`ref`	`gcc -O3 -fomit-frame-pointer`	20161217	20161026
3935162	`ref`	`gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv`	20161217	20161026
3937206	`ref`	`gcc -funroll-loops -march=nocona -O3 -fomit-frame-pointer`	20161217	20161026
3942152	`ref`	`gcc -m64 -march=core-avx-i -O3 -fomit-frame-pointer`	20161217	20161026
3946956	`ref`	`gcc -m64 -march=k8 -O3 -fomit-frame-pointer`	20161217	20161026
3965334	`ref`	`gcc -march=nocona -O3 -fomit-frame-pointer`	20161217	20161026
3973832	`ref`	`gcc -m64 -march=core-avx2 -Os -fomit-frame-pointer`	20161217	20161026
3978256	`ref`	`gcc -funroll-loops -O3 -fomit-frame-pointer`	20161217	20161026
3986780	`ref`	`gcc -m64 -march=native -mtune=native -Os -fomit-frame-pointer`	20161217	20161026
3986822	`ref`	`gcc -m64 -march=corei7-avx -O3 -fomit-frame-pointer`	20161217	20161026
3994754	`ref`	`gcc -funroll-loops -m64 -march=nocona -O3 -fomit-frame-pointer`	20161217	20161026
3996908	`ref`	`gcc -m64 -march=native -mtune=native -O3 -fomit-frame-pointer`	20161217	20161026
4008472	`ref`	`gcc -m64 -march=k8 -Os -fomit-frame-pointer`	20161217	20161026
4009972	`ref`	`gcc -m64 -march=nocona -Os -fomit-frame-pointer`	20161217	20161026
4011286	`ref`	`gcc -m64 -march=corei7-avx -Os -fomit-frame-pointer`	20161217	20161026
4013006	`ref`	`gcc -m64 -march=core-avx-i -Os -fomit-frame-pointer`	20161217	20161026
4013246	`ref`	`gcc -march=k8 -Os -fomit-frame-pointer`	20161217	20161026
4013882	`ref`	`gcc -m64 -march=barcelona -Os -fomit-frame-pointer`	20161217	20161026
4014358	`ref`	`gcc -march=barcelona -Os -fomit-frame-pointer`	20161217	20161026
4014378	`ref`	`gcc -fno-schedule-insns -Os -fomit-frame-pointer`	20161217	20161026
4014384	`ref`	`gcc -march=nocona -Os -fomit-frame-pointer`	20161217	20161026
4014578	`ref`	`gcc -Os -fomit-frame-pointer`	20161217	20161026
4014660	`ref`	`gcc -m64 -march=nocona -O3 -fomit-frame-pointer`	20161217	20161026
4015598	`ref`	`gcc -m64 -march=core2 -msse4 -Os -fomit-frame-pointer`	20161217	20161026
4016234	`ref`	`gcc -m64 -march=corei7 -Os -fomit-frame-pointer`	20161217	20161026
4016494	`ref`	`gcc -m64 -march=core2 -Os -fomit-frame-pointer`	20161217	20161026
4016614	`ref`	`gcc -m64 -march=core2 -msse4.1 -Os -fomit-frame-pointer`	20161217	20161026
4019100	`ref`	`gcc -funroll-loops -m64 -O2 -fomit-frame-pointer`	20161217	20161026
4020570	`ref`	`gcc -funroll-loops -O2 -fomit-frame-pointer`	20161217	20161026
4021502	`ref`	`gcc -funroll-loops -m64 -march=nocona -Os -fomit-frame-pointer`	20161217	20161026
4023806	`ref`	`gcc -m64 -Os -fomit-frame-pointer`	20161217	20161026
4024900	`ref`	`gcc -funroll-loops -march=k8 -Os -fomit-frame-pointer`	20161217	20161026
4028028	`ref`	`gcc -funroll-loops -march=barcelona -Os -fomit-frame-pointer`	20161217	20161026
4029168	`ref`	`gcc -funroll-loops -m64 -march=barcelona -Os -fomit-frame-pointer`	20161217	20161026
4029532	`ref`	`gcc -funroll-loops -m64 -Os -fomit-frame-pointer`	20161217	20161026
4029546	`ref`	`gcc -funroll-loops -Os -fomit-frame-pointer`	20161217	20161026
4029862	`ref`	`gcc -funroll-loops -fno-schedule-insns -Os -fomit-frame-pointer`	20161217	20161026
4030382	`ref`	`gcc -funroll-loops -m64 -march=k8 -Os -fomit-frame-pointer`	20161217	20161026
4033206	`ref`	`gcc -funroll-loops -march=nocona -Os -fomit-frame-pointer`	20161217	20161026
4034638	`ref`	`gcc -funroll-loops -march=barcelona -O2 -fomit-frame-pointer`	20161217	20161026
4036706	`ref`	`gcc -funroll-loops -march=k8 -O2 -fomit-frame-pointer`	20161217	20161026
4044040	`ref`	`gcc -funroll-loops -m64 -march=barcelona -O2 -fomit-frame-pointer`	20161217	20161026
4045216	`ref`	`gcc -O2 -fomit-frame-pointer`	20161217	20161026
4048218	`ref`	`gcc -funroll-loops -march=nocona -O2 -fomit-frame-pointer`	20161217	20161026
4049200	`ref`	`gcc -m64 -march=core2 -msse4 -O2 -fomit-frame-pointer`	20161217	20161026
4049578	`ref`	`gcc -m64 -march=corei7-avx -O2 -fomit-frame-pointer`	20161217	20161026
4050144	`ref`	`gcc -m64 -march=core2 -msse4.1 -O2 -fomit-frame-pointer`	20161217	20161026
4053200	`ref`	`gcc -funroll-loops -m64 -march=nocona -O2 -fomit-frame-pointer`	20161217	20161026
4053560	`ref`	`gcc -m64 -march=core-avx2 -O2 -fomit-frame-pointer`	20161217	20161026
4053834	`ref`	`gcc -m64 -march=core2 -O2 -fomit-frame-pointer`	20161217	20161026
4056214	`ref`	`gcc -m64 -march=barcelona -O2 -fomit-frame-pointer`	20161217	20161026
4056826	`ref`	`gcc -march=k8 -O2 -fomit-frame-pointer`	20161217	20161026
4057378	`ref`	`gcc -m64 -march=core-avx-i -O2 -fomit-frame-pointer`	20161217	20161026
4057662	`ref`	`gcc -march=nocona -O2 -fomit-frame-pointer`	20161217	20161026
4060944	`ref`	`gcc -fno-schedule-insns -O2 -fomit-frame-pointer`	20161217	20161026
4065034	`ref`	`gcc -m64 -march=nocona -O2 -fomit-frame-pointer`	20161217	20161026
4065948	`ref`	`gcc -m64 -march=k8 -O2 -fomit-frame-pointer`	20161217	20161026
4067912	`ref`	`gcc -funroll-loops -m64 -march=k8 -O2 -fomit-frame-pointer`	20161217	20161026
4069630	`ref`	`gcc -m64 -march=corei7 -O2 -fomit-frame-pointer`	20161217	20161026
4069948	`ref`	`gcc -m64 -O2 -fomit-frame-pointer`	20161217	20161026
4070236	`ref`	`clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments`	20161217	20161026
4072496	`ref`	`gcc -funroll-loops -fno-schedule-insns -O2 -fomit-frame-pointer`	20161217	20161026
4073454	`ref`	`clang -O3 -fwrapv -march=native -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
4076830	`ref`	`gcc -march=barcelona -O2 -fomit-frame-pointer`	20161217	20161026
4087114	`ref`	`gcc -m64 -march=native -mtune=native -O2 -fomit-frame-pointer`	20161217	20161026
4181552	`ref`	`clang -O3 -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
4182448	`ref`	`clang -mcpu=cortex-a9 -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments`	20161217	20161026
4189896	`ref`	`clang -mcpu=native -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments`	20161217	20161026
4199888	`ref`	`clang -O3 -fwrapv -mavx2 -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
4208830	`ref`	`clang -O3 -fwrapv -march=x86-64 -mcpu=core-avx2 -mavx2 -maes -mpclmul -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
4218296	`ref`	`clang -mcpu=cortex-a8 -mfpu=neon -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments`	20161217	20161026
4227766	`ref`	`clang -O3 -fwrapv -mavx -maes -mpclmul -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
4234448	`ref`	`clang -O3 -fwrapv -mavx -fomit-frame-pointer -Qunused-arguments`	20161217	20161026
6607356	`ref`	`gcc -funroll-loops -march=barcelona -O -fomit-frame-pointer`	20161217	20161026
6616232	`ref`	`gcc -funroll-loops -march=k8 -O -fomit-frame-pointer`	20161217	20161026
6633278	`ref`	`gcc -march=barcelona -O -fomit-frame-pointer`	20161217	20161026
6638366	`ref`	`gcc -funroll-loops -m64 -march=k8 -O -fomit-frame-pointer`	20161217	20161026
6639498	`ref`	`gcc -march=k8 -O -fomit-frame-pointer`	20161217	20161026
6666106	`ref`	`gcc -m64 -march=k8 -O -fomit-frame-pointer`	20161217	20161026
6677970	`ref`	`gcc -funroll-loops -march=nocona -O -fomit-frame-pointer`	20161217	20161026
6681086	`ref`	`gcc -funroll-loops -O -fomit-frame-pointer`	20161217	20161026
6682104	`ref`	`gcc -m64 -march=barcelona -O -fomit-frame-pointer`	20161217	20161026
6686656	`ref`	`gcc -funroll-loops -m64 -march=barcelona -O -fomit-frame-pointer`	20161217	20161026
6696494	`ref`	`gcc -funroll-loops -m64 -march=nocona -O -fomit-frame-pointer`	20161217	20161026
6697002	`ref`	`gcc -m64 -O -fomit-frame-pointer`	20161217	20161026
6707616	`ref`	`gcc -march=nocona -O -fomit-frame-pointer`	20161217	20161026
6710734	`ref`	`gcc -funroll-loops -fno-schedule-insns -O -fomit-frame-pointer`	20161217	20161026
6723524	`ref`	`gcc -m64 -march=core2 -msse4 -O -fomit-frame-pointer`	20161217	20161026
6727448	`ref`	`gcc -m64 -march=core-avx-i -O -fomit-frame-pointer`	20161217	20161026
6732742	`ref`	`gcc -m64 -march=corei7 -O -fomit-frame-pointer`	20161217	20161026
6732856	`ref`	`gcc -m64 -march=corei7-avx -O -fomit-frame-pointer`	20161217	20161026
6738226	`ref`	`gcc -m64 -march=core2 -msse4.1 -O -fomit-frame-pointer`	20161217	20161026
6739252	`ref`	`gcc -m64 -march=core2 -O -fomit-frame-pointer`	20161217	20161026
6747952	`ref`	`gcc -O -fomit-frame-pointer`	20161217	20161026
6756956	`ref`	`gcc -fno-schedule-insns -O -fomit-frame-pointer`	20161217	20161026
6758790	`ref`	`gcc -m64 -march=nocona -O -fomit-frame-pointer`	20161217	20161026
6768660	`ref`	`gcc -march=native -mtune=native -O -fomit-frame-pointer -fwrapv`	20161217	20161026
6770066	`ref`	`gcc -funroll-loops -m64 -O -fomit-frame-pointer`	20161217	20161026
6813810	`ref`	`gcc -m64 -march=native -mtune=native -O -fomit-frame-pointer`	20161217	20161026
6855824	`ref`	`gcc -m64 -march=core-avx2 -O -fomit-frame-pointer`	20161217	20161026
15460006	`ref`	`gcc`	20161217	20161026
15498340	`ref`	`gcc -funroll-loops`	20161217	20161026
15585418	`ref`	`cc`	20161217	20161026

Compiler output

Implementation: crypto_dh/nist521gs/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/nist521gs/ref
Compiler: clang -O3 -fomit-frame-pointer -Qunused-arguments

dh.c: dh.c:831:2: 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/nist521gs/ref
Compiler: gcc -m64 -march=barcelona -O2 -fomit-frame-pointer

dh.c: dh.c: In function 'crypto_dh_nist521gs_ref_keypair':
dh.c: dh.c:831:2: 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_nist521gs_ref_keypair':
dh.c: dh.c:831:2: 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