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author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr22591.c | |
parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr22591.c')
-rw-r--r-- | gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr22591.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr22591.c b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr22591.c new file mode 100644 index 000000000..f1f5ec849 --- /dev/null +++ b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/pr22591.c @@ -0,0 +1,56 @@ +/* { dg-do run } */ +/* { dg-options "-O2" } */ + +void abort (); + +typedef struct _Node +{ + struct _Node *next, *prev; +} Node; + +void __attribute__ ((noinline)) append (Node * q, Node * p) +{ + p->next = q; + p->prev = q; + q->next = p; + q->prev = p; +} + +inline void +swap (Node ** a, Node ** b) +{ + Node *tmp = *a; + *a = *b; + *b = tmp; +} + +/* Miscompilation seems to happen here. If one removes the if condition + (which should be true) the program works fine. */ +void +ListSwap (Node * x, Node * y) +{ + Node *tmp; + if (x->next) + { + swap (&x->next, &y->next); + swap (&x->prev, &y->prev); + x->next->prev = x->prev->next = x; + y->next->prev = y->prev->next = y; + } +} + +int +main () +{ + Node A, A1, B, B1; + + append (&A, &A1); + append (&B, &B1); + + ListSwap (&A, &B); + + if (&A != A.next->prev) + abort (); + + return 0; +} |