-rw-r--r-- 1092 lib25519-20221222/compilers/amd64+avx+bmi2+avx2+adx.c raw
#define CPUID(func,leaf,a,b,c,d) \ __asm("cpuid":"=a"(a),"=b"(b),"=c"(c),"=d"(d):"a"(func),"c"(leaf):) #define WANT_1_3 ((1<<23)|(1<<25)|(1<<26)) /* 23=mmx; 25=sse; 26=sse2 */ #define WANT_1_2 ((1<<0)|(1<<9)|(1<<19)|(1<<20)|(1<<27)|(1<<28)) /* 0=sse3; 9=ssse3; 19=sse41; 20=sse42; 27=osxsave; 28=avx */ #define WANT_7_1 ((1<<3)|(1<<5)|(1<<8)|(1<<19)) /* 3=bmi1; 5=avx2; 8=bmi2; 19=adx */ #define WANT_XCR ((1<<1)|(1<<2)) /* 1=xmm; 2=ymm */ int supports(void) { unsigned int cpuidmax,id0,id1,id2; unsigned int familymodelstepping; unsigned int feature0,feature1,feature2,feature3; unsigned int xcrlow,xcrhigh; CPUID(0,0,cpuidmax,id0,id1,id2); if (cpuidmax < 7) return 0; CPUID(1,0,familymodelstepping,feature1,feature2,feature3); if (WANT_1_2 != (WANT_1_2 & feature2)) return 0; if (WANT_1_3 != (WANT_1_3 & feature3)) return 0; CPUID(7,0,feature0,feature1,feature2,feature3); if (WANT_7_1 != (WANT_7_1 & feature1)) return 0; asm(".byte 15;.byte 1;.byte 208":"=a"(xcrlow),"=d"(xcrhigh):"c"(0)); if (WANT_XCR != (WANT_XCR & xcrlow)) return 0; return 1; }