On Mon, Aug 6, 2012 at 1:31 AM, Tom de Vries <tom_devr...@mentor.com> wrote: > Richard, > > the code in emit_case_bit_tests currently introduces a MINUS_EXPR in signed > type > (without checking if signed types wrap or not), which could mean introduction > of > undefined overflow. > > This patch fixes this problem by performing the MINUS_EXPR in an unsigned > type. > > Doing so also enables the vrp optimization for the test-case. > > Bootstrapped and reg-tested (ada inclusive) on x86_64. > > OK for trunk?
Ok. Thanks, Richard. > Thanks, > - Tom > > > 2012-08-06 Tom de Vries <t...@codesourcery.com> > > * tree-switch-conversion.c (emit_case_bit_tests): Generate MINUS_EXPR > in > unsigned type. > > * gcc.dg/tree-ssa/vrp78.c: New test.
