diff options
Diffstat (limited to 'gcc/testsuite/gcc.dg/tree-ssa/forwprop-6.c')
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/forwprop-6.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/forwprop-6.c b/gcc/testsuite/gcc.dg/tree-ssa/forwprop-6.c new file mode 100644 index 000000000..54e51097e --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/forwprop-6.c @@ -0,0 +1,27 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-forwprop1 -W -Wall" } */ +#if (__SIZEOF_INT__ == __SIZEOF_FLOAT__) +typedef int intflt; +#elif (__SIZEOF_LONG__ == __SIZEOF_FLOAT__) +typedef long intflt; +#else +#error Add target support here for type that will union float size +#endif + +intflt b; +void f(void) +{ + float a; + a = 1; + b = *(intflt*)&a; /* { dg-warning "aliasing" } */ +} + +/* We should be able to convert the cast to a VCE in forwprop1, + even if there is an aliasing violation. + ??? While this would be useful and nice to our users in this + particular situation before doing this transformation we have to + assure that a is killed by a dominating store via type float for + it to be valid. Then we might as well handle the situation by + value-numbering, removing the load alltogether. */ +/* { dg-final { scan-tree-dump-times "VIEW_CONVERT_EXPR" 1 "forwprop1" { xfail *-*-* } } } */ +/* { dg-final { cleanup-tree-dump "forwprop1" } } */ |