... which is confused about a useful testcase not using uninitialized variables.
Testcase committed. Richard. 2012-01-19 Richard Guenther <rguent...@suse.de> PR tree-optimization/37997 * gcc.dg/tree-ssa/ssa-pre-28.c: New testcase. Index: gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-28.c =================================================================== --- gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-28.c (revision 0) +++ gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-28.c (revision 0) @@ -0,0 +1,21 @@ +/* PR37997 */ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-pre-details" } */ + +int foo (int i, int b, int result) +{ + int mask; + if (b) + mask = -1; + else + mask = 0; + result = i + 1; + result = result & mask; + return result; +} + +/* We should insert i + 1 into the if (b) path as well as the simplified + i + 1 & -1 expression. And do replacement with two PHI temps. */ + +/* { dg-final { scan-tree-dump-times "with prephitmp" 2 "pre" } } */ +/* { dg-final { cleanup-tree-dump "pre" } } */