https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108357
--- Comment #13 from rguenther at suse dot de <rguenther at suse dot de> --- On Thu, 13 Apr 2023, chenglulu at loongson dot cn wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108357 > > --- Comment #10 from chenglulu <chenglulu at loongson dot cn> --- > (In reply to Xi Ruoyao from comment #5) > > The test fails on loongarch64-linux-gnu. foo is kept in 114t.threadfull1, > > but removed in 135t.forwprop3. > > > > Does this mean something is wrong for LoongArch, or we should simply check > > the tree dump in a later pass (for e.g. 254t.optimized)? > > If the definition of the macro DEFAULT_SIGNED_CHAR is changed to 0, the test > case can pass the test. I guess it is because the definition of > DEFAULT_SIGNED_CHAR affects the optimization of the ccp pass, resulting in > some > blocks that cannot be removed, resulting in the failure of this test case. Can you check if making b unsigned fixes the test for you? If so that's what we should do.
