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Re: [PATCH] convert MIN_EXPR operands to the same type (PR 87059)
On Sat, Aug 25, 2018 at 9:14 PM Jeff Law <firstname.lastname@example.org> wrote:
> On 08/24/2018 01:06 PM, Martin Sebor wrote:
> > PR 87059 points out an ICE in the recently enhanced VRP code
> > that was traced back to a MIN_EXPR built out of operands of
> > types with different sign by expand_builtin_strncmp().
> > The attached patch adjusts the function to make sure both
> > operands have the same type, and to make these mismatches
> > easier to detect, also adds an assertion to fold_binary_loc()
> > for these expressions.
> > Bootstrapped on x86_64-linux.
> > Martin
> > PS Aldy, I have not tested this on powerpc64le.
> > gcc-87059.diff
> > PR tree-optimization/87059 - internal compiler error: in set_value_range
> > gcc/ChangeLog:
> > PR tree-optimization/87059
> > * builtins.c (expand_builtin_strncmp): Convert MIN_EXPR operand
> > to the same type as the other.
> > * fold-const.c (fold_binary_loc): Assert expectation.
> I bootstrapped (but did not regression test) this on ppc64le and also
> built the linux kernel (which is where my tester tripped over this problem).
> Approved and installed on the trunk.
Please remove the assertion in fold_binary_loc again, we do not do this kind
of assertions there.