Re: [patch] Fix PR tree-optimization/92131

2019-10-23 Thread Richard Biener
On Wed, Oct 23, 2019 at 10:33 AM Eric Botcazou wrote: > > This is a regression present on mainline, 9 and 8 branches, but the underlying > issue is probably latent on the 7 branch. compare_values in tree-vrp.c can > rely on undefined overflow to compare symbolic expressions with constants so > we

[patch] Fix PR tree-optimization/92131

2019-10-23 Thread Eric Botcazou
This is a regression present on mainline, 9 and 8 branches, but the underlying issue is probably latent on the 7 branch. compare_values in tree-vrp.c can rely on undefined overflow to compare symbolic expressions with constants so we must make sure not to introduce such an overflow when combini