mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-19 22:06:35 +00:00
245 lines
6.8 KiB
C
245 lines
6.8 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <assert.h>
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/* The golden logs were obtained by running this test natively. */
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/* The abstracted result of a CLCL insn */
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typedef struct {
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uint64_t addr1;
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uint32_t len1;
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uint64_t addr2;
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uint32_t len2;
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uint8_t pad;
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uint32_t cc;
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} clcl_t;
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/* Register contents after CLCL insn */
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typedef struct {
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uint64_t r1;
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uint64_t r1p1;
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uint64_t r2;
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uint64_t r2p1;
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uint64_t cc;
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} clcl_regs;
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/* Run a single CLCL insn and return its raw result. */
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static clcl_regs
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do_clcl(uint64_t r1, uint64_t r1p1, uint64_t r2, uint64_t r2p1)
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{
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clcl_regs regs;
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register uint64_t a1 asm ("2") = r1;
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register uint64_t l1 asm ("3") = r1p1;
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register uint64_t a2 asm ("4") = r2;
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register uint64_t l2 asm ("5") = r2p1;
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register uint32_t cc asm ("7");
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asm volatile( "0: clcl 2,4\n\t"
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"jo 0b\n\t"
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"ipm %0\n\t"
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"srl %0,28\n\t"
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:"=d" (cc), "+d" (a1),"+d" (l1), "+d" (a2), "+d" (l2)
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: : "memory", "cc");
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regs.r1 = a1;
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regs.r1p1 = l1;
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regs.r2 = a2;
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regs.r2p1 = l2;
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regs.cc = cc;
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return regs;
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}
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clcl_t
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result_from_regs(clcl_regs regs)
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{
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clcl_t result;
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result.addr1 = regs.r1;
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result.len1 = regs.r1p1 & 0xFFFFFF;
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result.addr2 = regs.r2;
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result.len2 = regs.r2p1 & 0xFFFFFF;
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result.pad = (regs.r2p1 & 0xFF000000u) >> 24;
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result.cc = regs.cc;
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return result;
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}
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/* Run CLCL twice using different fill bits for unused register bits.
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Results ought to be the same */
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static clcl_t
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clcl(void *addr1, uint32_t len1,
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void *addr2, uint32_t len2, uint32_t pad)
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{
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clcl_t result1, result2;
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clcl_regs regs;
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uint64_t r1, r1p1, r2, r2p1;
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/* Check input arguments */
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assert((pad & 0xFF) == pad); /* an 8-byte value */
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assert((len1 & 0xFFFFFF) == len1);
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assert((len2 & 0xFFFFFF) == len2);
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/* Build up register contents setting unused bits to 0 */
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r1 = (uint64_t)addr1;
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r1p1 = len1;
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r2 = (uint64_t)addr2;
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r2p1 = len2 | (pad << 24);
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/* Run clcl */
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regs = do_clcl(r1, r1p1, r2, r2p1);
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result1 = result_from_regs(regs);
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/* Check unused bits */
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if ((regs.r1p1 >> 24) != 0)
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printf("FAIL: r1[0:39] modified (unused bits 0)\n");
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if ((regs.r2p1 >> 32) != 0)
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printf("FAIL: r2[0:31] modified (unused bits 0)\n");
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/* Check pad value */
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if (result1.pad != pad)
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printf("FAIL: pad byte modified (unused bits 0)\n");
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/* Build up register contents setting unused bits to 1 */
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r1p1 |= 0xFFFFFFFFFFull << 24;
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r2p1 |= ((uint64_t)0xFFFFFFFF) << 32;
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/* Run clcl again */
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regs = do_clcl(r1, r1p1, r2, r2p1);
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result2 = result_from_regs(regs);
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/* Check unused bits */
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if ((regs.r1p1 >> 24) != 0xFFFFFFFFFFull)
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printf("FAIL: r1[0:39] modified (unused bits 1)\n");
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if ((regs.r2p1 >> 32) != 0xFFFFFFFFu)
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printf("FAIL: r2[0:31] modified (unused bits 1)\n");
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/* Check pad value */
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if (result2.pad != pad)
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printf("FAIL: pad byte modified (unused bits 1)\n");
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/* Compare results */
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if (result1.addr1 != result2.addr1)
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printf("FAIL: addr1 result is different\n");
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if (result1.addr2 != result2.addr2)
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printf("FAIL: addr2 result is different\n");
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if (result1.len1 != result2.len1)
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printf("FAIL: len1 result is different\n");
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if (result1.len2 != result2.len2)
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printf("FAIL: len2 result is different\n");
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if (result1.pad != result2.pad)
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printf("FAIL: pad result is different\n");
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if (result1.cc != result2.cc)
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printf("FAIL: cc result is different\n");
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return result1;
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}
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void
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run_test(void *addr1, uint32_t len1, void *addr2, uint32_t len2, uint32_t pad)
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{
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clcl_t result;
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result = clcl(addr1, len1, addr2, len2, pad);
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printf("cc: %"PRIu32", len1: %"PRIu32", len2: %"PRIu32
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", addr1 diff: %"PRId64", addr2 diff: %"PRId64"\n", result.cc,
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result.len1, result.len2, (int64_t)result.addr1 - (int64_t)addr1,
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(int64_t)result.addr2 - (int64_t)addr2);
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}
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int main()
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{
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uint8_t byte, byte1, byte2;
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/* Test 1: both lengths are 0; nothing loaded from memory */
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printf("--- test 1 ---\n");
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run_test(NULL, 0, NULL, 0, 0x00);
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run_test(NULL, 0, NULL, 0, 0xff);
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/* Test 2: Compare two single bytes */
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printf("--- test 2 ---\n");
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byte1 = 10;
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byte2 = 20;
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run_test(&byte1, 1, &byte2, 1, 0x00); // first operand low
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run_test(&byte1, 1, &byte1, 1, 0x00); // equal
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run_test(&byte2, 1, &byte1, 1, 0x00); // first operand high
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run_test(&byte1, 1, &byte2, 1, 0xFF); // first operand low
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run_test(&byte1, 1, &byte1, 1, 0xFF); // equal
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run_test(&byte2, 1, &byte1, 1, 0xFF); // first operand high
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/* Test 3: Compare a single byte against the pad byte */
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printf("--- test 3 ---\n");
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byte = 10;
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run_test(NULL, 0, &byte, 1, 10); // equal
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run_test(NULL, 0, &byte, 1, 9); // first operand low
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run_test(NULL, 0, &byte, 1, 11); // first operand high
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/* Swap operands */
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run_test(&byte, 1, NULL, 0, 10); // equal
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run_test(&byte, 1, NULL, 0, 9); // first operand high
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run_test(&byte, 1, NULL, 0, 11); // first operand low
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/* Test 4: Make sure pad byte is interpreted as unsigned value */
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printf("--- test 4 ---\n");
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byte = 10;
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run_test(&byte, 1, NULL, 0, 0xFF); // first operand low
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byte = 0xFF;
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run_test(&byte, 1, NULL, 0, 0xFF); // equal
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/* Test 5: Compare a buffer against the pad byte */
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printf("--- test 5 ---\n");
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uint8_t buf1[4] = "yyyy";
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run_test(buf1, 4, NULL, 0, 'y'); // equal
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run_test(buf1, 4, NULL, 0, 'x'); // greater
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run_test(buf1, 4, NULL, 0, 'z'); // less
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/* Test 6: Compare two buffers of same size (difference in 1st byte) */
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{
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printf("--- test 6 ---\n");
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uint8_t x[5] = "pqrst";
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uint8_t y[5] = "abcde";
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uint8_t z[5] = "abcde";
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run_test(x, 5, y, 5, 'a'); // first operand low
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run_test(y, 5, x, 5, 'a'); // first operand high
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run_test(y, 5, z, 5, 'q'); // equal
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}
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/* Test 7: Compare two buffers of same size (difference in last byte) */
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{
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printf("--- test 7 ---\n");
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uint8_t x[5] = "abcdd";
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uint8_t y[5] = "abcde";
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uint8_t z[5] = "abcdf";
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run_test(x, 5, y, 5, 'a'); // first operand low
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run_test(z, 5, z, 5, 'a'); // first operand high
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}
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/* Test 8: Compare two buffers of different size. The difference
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is past the end of the shorter string. */
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{
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printf("--- test 8 ---\n");
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uint8_t x[5] = "abcde";
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uint8_t y[7] = "abcdeff";
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run_test(x, 5, y, 7, 0); // first operand low
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run_test(y, 7, x, 5, 0); // first operand high
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run_test(x, 5, y, 7, 'f'); // equal
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run_test(y, 7, x, 5, 'f'); // equal
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}
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/* Test 9: Compare two buffers of different size. The difference
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is before the end of the shorter string. */
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{
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printf("--- test 9 ---\n");
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uint8_t x[5] = "abcab";
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uint8_t y[7] = "abcdeff";
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run_test(x, 5, y, 7, 0); // first operand low
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run_test(y, 7, x, 5, 0); // first operand high
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run_test(x, 5, y, 7, 'f'); // first operand low
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run_test(y, 7, x, 5, 'f'); // first operand high
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}
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return 0;
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}
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