/* PR tree-optimization/21001 VRP did not insert ASSERT_EXPRs when the variable tested in a COND_EXPR is a single-use variable. By propagating the definition of the single-use variable into the COND_EXPR, we can get useful range information out of the conditional. */ /* { dg-do compile } */ /* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-vrp1-details" } */ int foo (int a) { int b = a != 0; if (b) if (a != 0) return 1; return 0; } /* { dg-final { scan-tree-dump-times "Folding predicate" 1 "vrp1"} } */ /* { dg-final { cleanup-tree-dump "vrp1" } } */