diff options
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/torture/pr77646.c | 21 | ||||
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 4 |
4 files changed, 36 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index cef1504..7ab0b82 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2016-09-20 Richard Biener <rguenther@suse.de> + + PR tree-optimization/77646 + * tree-ssa-sccvn.c (visit_reference_op_call): Always value-number + a VDEF. + 2016-09-20 Tamar Christina <tamar.christina@arm.com> * config/aarch64/arm_neon.h: Add gnu_inline and artificial diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index ca54995..9588bed 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-09-20 Richard Biener <rguenther@suse.de> + + PR tree-optimization/77646 + * gcc.dg/torture/pr77646.c: New testcase. + 2016-09-19 Bernd Edlinger <bernd.edlinger@hotmail.de> PR c++/77434 diff --git a/gcc/testsuite/gcc.dg/torture/pr77646.c b/gcc/testsuite/gcc.dg/torture/pr77646.c new file mode 100644 index 0000000..1b19900 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr77646.c @@ -0,0 +1,21 @@ +/* { dg-do compile } */ + +struct e { + int (*f)(); + void (*g)(); +} * c; +int a; +void *h(); +typedef struct { struct e j; } k; +int l() { return a; } +const struct e b = {l}; +void m() +{ + k *d = h(); + d->j = b; + c = (struct e *)d; + struct e *i = c; + if (i->f(c)) + while (i->f(c)) + i->g(); +} diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index e120b4f..bf5e97a 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -3470,6 +3470,10 @@ visit_reference_op_call (tree lhs, gcall *stmt) { if (vnresult->result_vdef && vdef) changed |= set_ssa_val_to (vdef, vnresult->result_vdef); + else if (vdef) + /* If the call was discovered to be pure or const reflect + that as far as possible. */ + changed |= set_ssa_val_to (vdef, vuse_ssa_val (gimple_vuse (stmt))); if (!vnresult->result && lhs) vnresult->result = lhs; |