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| Rev 298 |
Rev 338 |
/* { dg-do compile } */
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/* { dg-do compile } */
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/* { dg-options "-O2 -fdump-tree-vrp1-details" } */
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/* { dg-options "-O2 -fdump-tree-vrp1-details" } */
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static int blocksize = 4096;
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static int blocksize = 4096;
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int bar (int);
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int bar (int);
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void foo (void)
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void foo (void)
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{
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{
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int toread;
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int toread;
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int bytes;
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int bytes;
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static char eof_reached = 0;
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static char eof_reached = 0;
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toread = blocksize;
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toread = blocksize;
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bytes = 1;
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bytes = 1;
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while (toread != 0)
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while (toread != 0)
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{
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{
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bytes = bar (toread);
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bytes = bar (toread);
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if (bytes <= 0)
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if (bytes <= 0)
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{
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{
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if (bytes < 0)
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if (bytes < 0)
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continue;
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continue;
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break;
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break;
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}
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}
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toread -= bytes;
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toread -= bytes;
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}
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}
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if (bytes == 0)
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if (bytes == 0)
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eof_reached = 1;
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eof_reached = 1;
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}
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}
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/* First, we should simplify the bits < 0 test within the loop. */
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/* First, we should simplify the bits < 0 test within the loop. */
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/* { dg-final { scan-tree-dump-times "Simplified relational" 1 "vrp1" } } */
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/* { dg-final { scan-tree-dump-times "Simplified relational" 1 "vrp1" } } */
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/* Second, we should thread the edge out of the loop via the break
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/* Second, we should thread the edge out of the loop via the break
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statement. We also realize that the final bytes == 0 test is useless,
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statement. We also realize that the final bytes == 0 test is useless,
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and thread over it. */
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and thread over it. */
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/* { dg-final { scan-tree-dump-times "Threaded jump" 3 "vrp1" } } */
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/* { dg-final { scan-tree-dump-times "Threaded jump" 3 "vrp1" } } */
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/* { dg-final { cleanup-tree-dump "vrp1" } } */
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/* { dg-final { cleanup-tree-dump "vrp1" } } */
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