43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
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/* See if various BMI2 instructions give expected results */
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#include <assert.h>
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#include <stdint.h>
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int main(int argc, char *argv[]) {
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uint64_t ehlo = 0x202020204f4c4845ull;
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uint64_t mask = 0xa080800302020001ull;
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uint32_t result32;
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#ifdef __x86_64
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uint64_t result64;
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/* 64 bits */
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asm volatile ("pextq %2, %1, %0" : "=r"(result64) : "r"(ehlo), "m"(mask));
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assert(result64 == 133);
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asm volatile ("pdepq %2, %1, %0" : "=r"(result64) : "r"(result64), "m"(mask));
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assert(result64 == (ehlo & mask));
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asm volatile ("pextq %2, %1, %0" : "=r"(result64) : "r"(-1ull), "m"(mask));
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assert(result64 == 511); /* mask has 9 bits set */
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asm volatile ("pdepq %2, %1, %0" : "=r"(result64) : "r"(-1ull), "m"(mask));
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assert(result64 == mask);
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#endif
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/* 32 bits */
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asm volatile ("pextl %2, %k1, %k0" : "=r"(result32) : "r"((uint32_t) ehlo), "m"(mask));
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assert(result32 == 5);
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asm volatile ("pdepl %2, %k1, %k0" : "=r"(result32) : "r"(result32), "m"(mask));
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assert(result32 == (uint32_t)(ehlo & mask));
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asm volatile ("pextl %2, %k1, %k0" : "=r"(result32) : "r"(-1ull), "m"(mask));
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assert(result32 == 7); /* mask has 3 bits set */
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asm volatile ("pdepl %2, %k1, %k0" : "=r"(result32) : "r"(-1ull), "m"(mask));
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assert(result32 == (uint32_t)mask);
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return 0;
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}
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