diff options
Diffstat (limited to 'gcc/testsuite/gcc.c-torture/execute/bitfld-4.c')
-rw-r--r-- | gcc/testsuite/gcc.c-torture/execute/bitfld-4.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/bitfld-4.c b/gcc/testsuite/gcc.c-torture/execute/bitfld-4.c new file mode 100644 index 000000000..6f7d7e25c --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/bitfld-4.c @@ -0,0 +1,21 @@ +/* When comparisons of bit-fields to unsigned constants got shortened, + the shortened signed constant was wrongly marked as overflowing, + leading to a later integer_zerop failure and misoptimization. + + Related to bug tree-optimization/16437 but shows the problem on + 32-bit systems. */ +/* Origin: Joseph Myers <jsm@polyomino.org.uk> */ + +extern void abort (void); + +struct s { int a:12, b:20; }; + +struct s x = { -123, -456 }; + +int +main (void) +{ + if (x.a != -123U || x.b != -456U) + abort (); + return 0; +} |