diff options
Diffstat (limited to 'gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-5.c')
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-5.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-5.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-5.c new file mode 100644 index 000000000..537a5e57b --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-5.c @@ -0,0 +1,33 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +int x; + +int +f1 (int i, int j, int k) +{ + int *p = k ? &i : &j; + i = 3; + *p = 5; + x = j; +} + +/* The assignment "i = 3" is partialy dead. Our DSE pass doesn't handle + detection of partially dead assignments. + + There's two outputs which would indicate that the optimization was + performed. + + If we used block copying to detect and eliminate the partially dead + store, then we should see an assignment "i = 5" somewhere in the + dump file. + + Another approach would be to redirect the path from the true arm + of the first conditional so that it reaches the statement *p = 5 + rather than i = 3. */ + +/* { dg-final { scan-tree-dump-times "i = 5" 1 "optimized" { xfail *-*-* }} } */ +/* { dg-final { scan-tree-dump-times "<L.*>:;\[\n\t \]*\\*p = 5" 1 "optimized" { xfail *-*-*}} } */ + +/* { dg-final { cleanup-tree-dump "optimized" } } */ + |