31 lines
751 B
C
31 lines
751 B
C
/* { dg-do run } */
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/* { dg-require-effective-target stdint_types } */
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/* { dg-options "-O2" } */
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#include <stdint.h>
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extern void abort (void);
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uint64_t __attribute__((noinline))
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byteswap64(uint64_t x)
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{
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uint32_t a = x >> 32;
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uint32_t b = (uint32_t) x;
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return ((uint64_t) ((((((b)) >> (8)) | (((b)) << (32 - (8)))) & 0xff00ff00L)
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| (((((b)) << (8)) | (((b)) >> (32 - (8)))) & 0x00ff00ffL)) << 32)
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| (uint64_t) ((((((a)) >> (8)) | (((a)) << (32 - (8)))) & 0xff00ff00L)
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| (((((a)) << (8)) | (((a)) >> (32 - (8)))) & 0x00ff00ffL));
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}
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int
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main ()
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{
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uint64_t in = (uint64_t)0x01020304 << 32 | 0x05060708;
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uint64_t cmp = (uint64_t)0x08070605 << 32 | 0x04030201;
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if (cmp != byteswap64 (in))
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abort ();
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return 0;
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}
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