120 lines
1.9 KiB
C
120 lines
1.9 KiB
C
/* { dg-do compile } */
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/* { dg-options "-O2 -fdump-tree-vrp1-stats -fdump-tree-dom1-stats" } */
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void foo();
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void bla();
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void bar();
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/* In the following two cases, we should be able to thread edge through
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the loop header. */
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void thread_entry_through_header (void)
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{
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int i;
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for (i = 0; i < 170; i++)
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bla ();
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}
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void thread_latch_through_header (void)
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{
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int i = 0;
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int first = 1;
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do
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{
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if (first)
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foo ();
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first = 0;
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bla ();
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} while (i++ < 100);
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}
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/* This is a TODO -- it is correct to thread both entry and latch edge through
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the header, but we do not handle this case yet. */
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void dont_thread_1 (void)
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{
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int i = 0;
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int first = 1;
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do
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{
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if (first)
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foo ();
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else
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bar ();
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first = 0;
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bla ();
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} while (i++ < 100);
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}
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/* Avoid threading in the following two cases, to prevent creating subloops. */
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void dont_thread_2 (int first)
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{
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int i = 0;
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do
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{
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if (first)
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foo ();
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else
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bar ();
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first = 0;
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bla ();
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} while (i++ < 100);
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}
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void dont_thread_3 (int nfirst)
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{
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int i = 0;
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int first = 0;
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do
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{
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if (first)
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foo ();
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else
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bar ();
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first = nfirst;
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bla ();
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} while (i++ < 100);
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}
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/* Avoid threading in this case, in order to avoid creating loop with
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multiple entries. */
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void dont_thread_4 (int a, int nfirst)
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{
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int i = 0;
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int first;
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if (a)
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first = 0;
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else
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first = 1;
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do
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{
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if (first)
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foo ();
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else
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bar ();
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first = nfirst;
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bla ();
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} while (i++ < 100);
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}
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/* { dg-final { scan-tree-dump-times "Jumps threaded: 1" 1 "vrp1"} } */
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/* { dg-final { scan-tree-dump-times "Jumps threaded: 2" 0 "vrp1"} } */
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/* { dg-final { scan-tree-dump-times "Jumps threaded: 1" 0 "dom1"} } */
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/* { dg-final { scan-tree-dump-times "Jumps threaded: 2" 1 "dom1"} } */
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/* { dg-final { cleanup-tree-dump "dom1" } } */
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/* { dg-final { cleanup-tree-dump "vrp1" } } */
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