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/* The abstracted result of an CU24 insn */
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uint64_t addr1; // target
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uint64_t addr2; // source
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/* Define various input buffers. */
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/* Single UTF-16 value */
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uint16_t pattern1[] = {
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0x0000, 0xd7ff, /* [0000 ... d7ff] corner cases */
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0xdc00, 0xffff, /* [dc00 ... ffff] corner cases */
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0x0047, 0x0156, 0x1245, 0xa021, 0xfffe /* misc */
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/* UTF-16 surrogate pair */
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uint16_t pattern2[] = {
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0xd800, 0xdc00, /* left corner case */
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0xdbff, 0xdfff, /* right corner case */
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0xdada, 0xdddd, 0xdeaf, 0xdcdc /* misc */
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/* Invalid low surrogate */
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uint16_t invalid[] = { 0xd801, 0x0098 };
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/* This is the buffer for the converted bytes. */
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uint32_t buff[1000]; /* Large so we con'don't have to worry about it */
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do_cu24(uint32_t *dst, uint64_t dst_len, uint16_t *src, uint64_t src_len)
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/* build up the register pairs */
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register uint16_t *source asm("4") = src;
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register uint64_t source_len asm("5") = src_len;
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register uint32_t *dest asm("2") = dst;
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register uint64_t dest_len asm("3") = dst_len;
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: "+d"(dest), "+d"(source), "=d"(cc),
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"+d"(source_len), "+d"(dest_len)
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/* Capture register contents at end of cu24 */
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regs.addr1 = (uint64_t)dest;
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regs.addr2 = (uint64_t)source;
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regs.len2 = source_len;
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run_test(uint32_t *dst, uint64_t dst_len, uint16_t *src, uint64_t src_len)
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result = do_cu24(dst, dst_len, src, src_len);
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// Write out the converted byte, if any
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if (dst_len - result.len1 == 0)
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uint64_t num_bytes = dst_len - result.len1;
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/* The number of bytes that were written must be divisible by 4 */
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if (num_bytes % 4 != 0)
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fprintf(stderr, "*** number of bytes is not a multiple of 4\n");
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for (i = 0; i < num_bytes / 4; i++) {
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printf(" %02x", dst[i]);
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printf(" cc = %d\n", result.cc);
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printf(" dst address difference: %"PRId64, result.addr1 - (uint64_t)dst);
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printf(" dst len: %"PRId64"\n", result.len1);
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printf(" src address difference: %"PRId64, result.addr2 - (uint64_t)src);
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printf(" src len: %"PRId64"\n", result.len2);
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/* Length == 0, no memory should be read or written */
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printf("\n------------- test1 ----------------\n");
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run_test(NULL, 0, NULL, 0);
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/* Test exhaustion of source length (source bytes are valid) */
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printf("\n------------- test2.1 ----------------\n");
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/* No character will be written to BUFF, i.e. loop in jitted code
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run_test(buff, sizeof buff, NULL, 1);
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run_test(buff, sizeof buff, pattern1, 1);
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run_test(buff, sizeof buff, pattern2, 1);
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run_test(buff, sizeof buff, pattern2, 2);
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run_test(buff, sizeof buff, pattern2, 3);
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printf("\n------------- test2.2 ----------------\n");
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/* At least one character will be written to BUFF, i.e. loop in jitted
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run_test(buff, sizeof buff, pattern1, 3);
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run_test(buff, sizeof buff, pattern1, 5);
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run_test(buff, sizeof buff, pattern2, 2);
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run_test(buff, sizeof buff, pattern2, 5);
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run_test(buff, sizeof buff, pattern2, 7);
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/* Test exhaustion of destination length (source bytes are valid) */
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printf("\n------------- test3.1 ----------------\n");
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/* No character will be written to BUFF, i.e. loop in jitted code
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/* Want to write 4 bytes at a time */
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run_test(NULL, 0, pattern1, sizeof pattern1);
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run_test(NULL, 1, pattern1, sizeof pattern1);
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run_test(NULL, 2, pattern1, sizeof pattern1);
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run_test(NULL, 3, pattern1, sizeof pattern1);
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printf("\n------------- test3.2 ----------------\n");
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/* At least one character will be written to BUFF, i.e. loop in jitted
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run_test(buff, 4, pattern1, sizeof pattern1);
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run_test(buff, 5, pattern1, sizeof pattern1);
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run_test(buff, 6, pattern1, sizeof pattern1);
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run_test(buff, 7, pattern1, sizeof pattern1);
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/* When both operands are exhausted, cc=0 takes precedence.
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(test1 tests this for len == 0) */
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printf("\n------------- test4 ----------------\n");
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run_test(buff, 4, pattern1, 2); // no iteration
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run_test(buff, 8, pattern1, 4); // iteration
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/* Input has invalid low surrogate. */
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printf("\n------------- test5 ----------------\n");
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run_test(buff, sizeof buff, invalid, sizeof invalid);
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run_test(buff, 0, invalid, sizeof invalid);
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/* Convert all pattern buffers */
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printf("\n------------- test6 ----------------\n");
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run_test(buff, sizeof buff, pattern1, sizeof pattern1);
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run_test(buff, sizeof buff, pattern2, sizeof pattern2);