43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
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/* See if various MMX/SSE SSSE3 instructions give expected results */
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char *argv[]) {
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char hello[16];
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const char ehlo[8] = "EHLO ";
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uint64_t mask = 0x8080800302020001;
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uint64_t a = 0x0000000000090007;
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uint64_t b = 0x0000000000000000;
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const char c[16] = "LLOaaaaaaaaaaaaa";
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const char d[16] = "aaaaaaaaaaaaaaHE";
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/* pshufb mm1/xmm1, mm2/xmm2 */
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asm volatile ("movq (%0), %%mm0" : : "r" (ehlo) : "mm0", "mm1");
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asm volatile ("movq %0, %%mm1" : : "m" (mask));
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asm volatile ("pshufb %mm1, %mm0");
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asm volatile ("movq %%mm0, %0" : "=m" (hello));
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printf("%s\n", hello);
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/* pshufb mm1/xmm1, m64/m128 */
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asm volatile ("movq (%0), %%mm0" : : "r" (ehlo) : "mm0");
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asm volatile ("pshufb %0, %%mm0" : : "m" (mask));
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asm volatile ("movq %%mm0, %0" : "=m" (hello));
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printf("%s\n", hello);
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/* psubsw mm1/xmm1, m64/m128 */
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asm volatile ("movq %0, %%mm0" : : "r" (a) : "mm0");
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asm volatile ("phsubsw %0, %%mm0" : : "m" (b));
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asm volatile ("movq %%mm0, %0" : "=m" (a));
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printf("%i - %i = %i\n", 9, 7, -(int16_t) a);
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/* palignr mm1/xmm1, m64/m128, imm8 */
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asm volatile ("movdqa (%0), %%xmm0" : : "r" (c) : "xmm0");
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asm volatile ("palignr $14, (%0), %%xmm0" : : "r" (d));
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asm volatile ("movdqa %%xmm0, (%0)" : : "r" (hello));
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printf("%5.5s\n", hello);
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return 0;
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}
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