Implementation notes: amd64, h6sandy, crypto_sign/ed448goldilocks

Computer: h6sandy
Microarchitecture: amd64; Sandy Bridge (206a7)
Architecture: amd64
CPU ID: GenuineIntel-000206a7-bfebfbff
SUPERCOP version: 20240107
Operation: crypto_sign
Primitive: ed448goldilocks

Time	Object size	Test size	Implementation	Compiler	Benchmark date	SUPERCOP version
1009068	66211 24 21924	86293 980 23680	`T:amd64`	`clang_-march=native_-O2_-fomit-frame-pointer_-fwrapv_-Qunused-arguments_-fPIC_-fPIE`	20231214	20231212
1018563	69041 24 21924	89549 980 23680	`T:amd64`	`clang_-mcpu=native_-O3_-fomit-frame-pointer_-fwrapv_-Qunused-arguments_-fPIC_-fPIE`	20231214	20231212
1019809	68603 24 21924	90637 980 23680	`T:amd64`	`clang_-march=native_-O3_-fomit-frame-pointer_-fwrapv_-Qunused-arguments_-fPIC_-fPIE`	20231214	20231212
1072420	55781 24 21924	74061 980 23680	`T:amd64`	`clang_-march=native_-O_-fomit-frame-pointer_-fwrapv_-Qunused-arguments_-fPIC_-fPIE`	20231214	20231212
1099323	51872 24 21924	70063 972 23680	`T:amd64`	`clang_-march=native_-Os_-fomit-frame-pointer_-fwrapv_-Qunused-arguments_-fPIC_-fPIE`	20231214	20231212
1261475	96451 24 21924	117693 980 23680	`T:64`	`clang_-mcpu=native_-O3_-fomit-frame-pointer_-fwrapv_-Qunused-arguments_-fPIC_-fPIE`	20231214	20231212
1279907	58259 24 21924	78415 940 23744	`T:amd64`	`gcc_-march=native_-mtune=native_-O_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212
1394978	112082 24 21924	134015 940 23744	`T:64`	`gcc_-march=native_-mtune=native_-O3_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212
1413328	74957 24 21924	95663 940 23744	`T:64`	`gcc_-march=native_-mtune=native_-O2_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212
1415385	72498 24 21924	92679 940 23744	`T:64`	`gcc_-march=native_-mtune=native_-O_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212
1427826	41400 24 21924	60287 932 23712	`T:64`	`gcc_-march=native_-mtune=native_-Os_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212
2870349	84926 24 18852	105301 980 20608	`T:32`	`clang_-mcpu=native_-O3_-fomit-frame-pointer_-fwrapv_-Qunused-arguments_-fPIC_-fPIE`	20231214	20231212
3013801	83880 24 18852	105799 940 20672	`T:32`	`gcc_-march=native_-mtune=native_-O3_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212
3370787	50731 24 18852	69399 932 20640	`T:32`	`gcc_-march=native_-mtune=native_-Os_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212
3481198	62018 24 18852	82695 940 20672	`T:32`	`gcc_-march=native_-mtune=native_-O2_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212
4033238	59867 24 18852	80047 940 20672	`T:32`	`gcc_-march=native_-mtune=native_-O_-fomit-frame-pointer_-fwrapv_-fPIC_-fPIE`	20231214	20231212

Test failure

Implementation: T:32
Security model: timingleaks
Compiler: clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE

error 111

Number of similar (compiler,implementation) pairs: 8, namely:

Compiler	Implementations
clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32
clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32
clang -march=native -O -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32
clang -march=native -Os -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32
clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64
clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64
clang -march=native -O -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64
clang -march=native -Os -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64

Test failure

Implementation: T:amd64
Security model: timingleaks
Compiler: gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE

error 111
crypto_sign_open returns nonzero

Number of similar (compiler,implementation) pairs: 3, namely:

Compiler	Implementations
gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:amd64
gcc -march=native -mtune=native -O3 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:amd64
gcc -march=native -mtune=native -Os -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:amd64

Compiler output

Implementation: T:32
Security model: timingleaks
Compiler: clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE

Number of similar (compiler,implementation) pairs: 5, namely:

Compiler	Implementations
clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32
clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32
clang -march=native -O -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32
clang -march=native -Os -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32
clang -mcpu=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:32

Compiler output

Implementation: T:32
Security model: timingleaks
Compiler: gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE

barrett_field.c: In file included from /usr/include/endian.h:21,
barrett_field.c: from word.h:17,
barrett_field.c: from barrett_field.h:15,
barrett_field.c: from barrett_field.c:5:
barrett_field.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
barrett_field.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
barrett_field.c: | ^~~~~~~
ec_point.c: In file included from /usr/include/endian.h:21,
ec_point.c: from word.h:17,
ec_point.c: from p448.h:7,
ec_point.c: from ec_point.h:13,
ec_point.c: from ec_point.c:12:
ec_point.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
ec_point.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
ec_point.c: | ^~~~~~~
goldilocks.c: In file included from /usr/include/endian.h:21,
goldilocks.c: from word.h:17,
goldilocks.c: from goldilocks.c:6:
goldilocks.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
goldilocks.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
goldilocks.c: | ^~~~~~~
magic.c: In file included from /usr/include/endian.h:21,
magic.c: from word.h:17,
magic.c: from magic.h:14,
magic.c: from field.h:11,
magic.c: from magic.c:5:
magic.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
magic.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
magic.c: | ^~~~~~~
p448.c: In file included from /usr/include/endian.h:21,
p448.c: from word.h:17,
p448.c: from p448.c:5:
p448.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
p448.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
p448.c: | ^~~~~~~
scalarmul.c: In file included from /usr/include/endian.h:21,
scalarmul.c: from word.h:17,
scalarmul.c: from scalarmul.c:5:
scalarmul.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
scalarmul.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
scalarmul.c: | ^~~~~~~
sha512.c: In file included from /usr/include/endian.h:21,
sha512.c: from word.h:17,
sha512.c: from sha512.c:5:
sha512.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
sha512.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
sha512.c: | ^~~~~~~

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

Compiler	Implementations
gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:32
gcc -march=native -mtune=native -O3 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:32
gcc -march=native -mtune=native -O -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:32
gcc -march=native -mtune=native -Os -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:32

Compiler output

Implementation: T:64
Security model: timingleaks
Compiler: clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE

Number of similar (compiler,implementation) pairs: 5, namely:

Compiler	Implementations
clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64
clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64
clang -march=native -O -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64
clang -march=native -Os -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64
clang -mcpu=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:64

Compiler output

Implementation: T:64
Security model: timingleaks
Compiler: gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE

barrett_field.c: In file included from /usr/include/endian.h:21,
barrett_field.c: from word.h:17,
barrett_field.c: from barrett_field.h:15,
barrett_field.c: from barrett_field.c:5:
barrett_field.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
barrett_field.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
barrett_field.c: | ^~~~~~~
goldilocks.c: In file included from /usr/include/endian.h:21,
goldilocks.c: from word.h:17,
goldilocks.c: from goldilocks.c:6:
goldilocks.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
goldilocks.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
goldilocks.c: | ^~~~~~~
magic.c: In file included from /usr/include/endian.h:21,
magic.c: from word.h:17,
magic.c: from magic.h:14,
magic.c: from field.h:11,
magic.c: from magic.c:5:
magic.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
magic.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
magic.c: | ^~~~~~~
scalarmul.c: In file included from /usr/include/endian.h:21,
scalarmul.c: from word.h:17,
scalarmul.c: from scalarmul.c:5:
scalarmul.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
scalarmul.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
scalarmul.c: | ^~~~~~~
sha512.c: In file included from /usr/include/endian.h:21,
sha512.c: from word.h:17,
sha512.c: from sha512.c:5:
sha512.c: /usr/include/features.h:194:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
sha512.c: 194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
sha512.c: | ^~~~~~~

Number of similar (compiler,implementation) pairs: 8, namely:

Compiler	Implementations
gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:64
gcc -march=native -mtune=native -O3 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:64
gcc -march=native -mtune=native -O -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:64
gcc -march=native -mtune=native -Os -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:64
gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:amd64
gcc -march=native -mtune=native -O3 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:amd64
gcc -march=native -mtune=native -O -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:amd64
gcc -march=native -mtune=native -Os -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:amd64

Compiler output

Implementation: T:amd64
Security model: timingleaks
Compiler: clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE

Number of similar (compiler,implementation) pairs: 5, namely:

Compiler	Implementations
clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:amd64
clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:amd64
clang -march=native -O -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:amd64
clang -march=native -Os -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:amd64
clang -mcpu=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:amd64

Compiler output

Implementation: T:neon
Security model: timingleaks
Compiler: clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE

barrett_field.c: In file included from barrett_field.c:5:
barrett_field.c: In file included from ./barrett_field.h:15:
barrett_field.c: In file included from ./word.h:17:
barrett_field.c: In file included from /usr/include/endian.h:21:
barrett_field.c: /usr/include/features.h:194:3: warning: "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-W#warnings]
barrett_field.c: # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
barrett_field.c: ^
barrett_field.c: 1 warning generated.
crandom.c: In file included from crandom.c:11:
crandom.c: In file included from ./magic.h:15:
crandom.c: ./p448.h:314:14: warning: implicit declaration of function 'vshr_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
crandom.c: tmp = vshr_n_u32(aa[7],28);
crandom.c: ^
crandom.c: ./p448.h:318:17: warning: implicit declaration of function 'vsra_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
crandom.c: aa[i] = vsra_n_u32(aa[i] & vmask, aa[i-1], 28);
crandom.c: ^
crandom.c: ./p448.h:320:31: warning: implicit declaration of function 'vrev64_u32' is invalid in C99 [-Wimplicit-function-declaration]
crandom.c: aa[0] = (aa[0] & vmask) + vrev64_u32(tmp) + (tmp&vm2);
crandom.c: ^
crandom.c: 3 warnings generated.
ec_point.c: In file included from ec_point.c:12:
ec_point.c: In file included from ./ec_point.h:13:
ec_point.c: In file included from ./p448.h:7:
ec_point.c: In file included from ./word.h:17:
ec_point.c: In file included from /usr/include/endian.h:21:
ec_point.c: /usr/include/features.h:194:3: warning: "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-W#warnings]
ec_point.c: # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
ec_point.c: ^
ec_point.c: In file included from ec_point.c:12:
ec_point.c: In file included from ./ec_point.h:13:
ec_point.c: ./p448.h:314:14: warning: implicit declaration of function 'vshr_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
ec_point.c: tmp = vshr_n_u32(aa[7],28);
ec_point.c: ^
ec_point.c: ./p448.h:318:17: warning: implicit declaration of function 'vsra_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
ec_point.c: aa[i] = vsra_n_u32(aa[i] & vmask, aa[i-1], 28);
ec_point.c: ^
ec_point.c: ./p448.h:320:31: warning: implicit declaration of function 'vrev64_u32' is invalid in C99 [-Wimplicit-function-declaration]
ec_point.c: aa[0] = (aa[0] & vmask) + vrev64_u32(tmp) + (tmp&vm2);
ec_point.c: ^
ec_point.c: 4 warnings generated.
goldilocks.c: In file included from goldilocks.c:6:
goldilocks.c: In file included from ./word.h:17:
goldilocks.c: In file included from /usr/include/endian.h:21:
goldilocks.c: /usr/include/features.h:194:3: warning: "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-W#warnings]
goldilocks.c: # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
goldilocks.c: ^
goldilocks.c: In file included from goldilocks.c:15:
goldilocks.c: In file included from ./ec_point.h:13:
goldilocks.c: ./p448.h:314:14: warning: implicit declaration of function 'vshr_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
goldilocks.c: tmp = vshr_n_u32(aa[7],28);
goldilocks.c: ^
goldilocks.c: ./p448.h:318:17: warning: implicit declaration of function 'vsra_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
goldilocks.c: aa[i] = vsra_n_u32(aa[i] & vmask, aa[i-1], 28);
goldilocks.c: ^
goldilocks.c: ./p448.h:320:31: warning: implicit declaration of function 'vrev64_u32' is invalid in C99 [-Wimplicit-function-declaration]
goldilocks.c: aa[0] = (aa[0] & vmask) + vrev64_u32(tmp) + (tmp&vm2);
goldilocks.c: ^
goldilocks.c: 4 warnings generated.
magic.c: In file included from magic.c:5:
magic.c: In file included from ./field.h:11:
magic.c: In file included from ./magic.h:14:
magic.c: In file included from ./word.h:17:
magic.c: In file included from /usr/include/endian.h:21:
magic.c: /usr/include/features.h:194:3: warning: "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-W#warnings]
magic.c: # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
magic.c: ^
magic.c: In file included from magic.c:5:
magic.c: In file included from ./field.h:11:
magic.c: In file included from ./magic.h:15:
magic.c: ./p448.h:314:14: warning: implicit declaration of function 'vshr_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
magic.c: tmp = vshr_n_u32(aa[7],28);
magic.c: ^
magic.c: ./p448.h:318:17: warning: implicit declaration of function 'vsra_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
magic.c: aa[i] = vsra_n_u32(aa[i] & vmask, aa[i-1], 28);
magic.c: ^
magic.c: ./p448.h:320:31: warning: implicit declaration of function 'vrev64_u32' is invalid in C99 [-Wimplicit-function-declaration]
magic.c: aa[0] = (aa[0] & vmask) + vrev64_u32(tmp) + (tmp&vm2);
magic.c: ^
magic.c: 4 warnings generated.
p448.c: In file included from p448.c:5:
p448.c: In file included from ./word.h:17:
p448.c: In file included from /usr/include/endian.h:21:
p448.c: /usr/include/features.h:194:3: warning: "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-W#warnings]
p448.c: # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
p448.c: ^
p448.c: In file included from p448.c:6:
p448.c: ./p448.h:314:14: warning: implicit declaration of function 'vshr_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
p448.c: tmp = vshr_n_u32(aa[7],28);
p448.c: ^
p448.c: ./p448.h:318:17: warning: implicit declaration of function 'vsra_n_u32' is invalid in C99 [-Wimplicit-function-declaration]
p448.c: aa[i] = vsra_n_u32(aa[i] & vmask, aa[i-1], 28);
p448.c: ^
p448.c: ./p448.h:320:31: warning: implicit declaration of function 'vrev64_u32' is invalid in C99 [-Wimplicit-function-declaration]
p448.c: aa[0] = (aa[0] & vmask) + vrev64_u32(tmp) + (tmp&vm2);
p448.c: ^
p448.c: p448.c:19:36: error: invalid output constraint '+w' in asm
p448.c: __asm__ ("vadd.s64 %f0, %e0" : "+w"(x));
p448.c: ^
p448.c: p448.c:25:36: error: invalid output constraint '+w' in asm
p448.c: __asm__ ("vswp.s64 %e0, %f0" : "+w"(x));
p448.c: ^
p448.c: p448.c:31:36: error: invalid output constraint '+w' in asm
p448.c: __asm__ ("vswp.s64 %e0, %f0" : "+w"(x));
p448.c: ^
p448.c: ...

Number of similar (compiler,implementation) pairs: 5, namely:

Compiler	Implementations
clang -march=native -O2 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:neon
clang -march=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:neon
clang -march=native -O -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:neon
clang -march=native -Os -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:neon
clang -mcpu=native -O3 -fomit-frame-pointer -fwrapv -Qunused-arguments -fPIC -fPIE	T:neon

Compiler output

Implementation: T:neon
Security model: timingleaks
Compiler: gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE

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

Compiler	Implementations
gcc -march=native -mtune=native -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:neon
gcc -march=native -mtune=native -O3 -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:neon
gcc -march=native -mtune=native -O -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:neon
gcc -march=native -mtune=native -Os -fomit-frame-pointer -fwrapv -fPIC -fPIE	T:neon