[Bug tree-optimization/78696] [7 Regression] -fprintf-return-value misoptimizes %.Ng where N is greater than 10

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78696

--- Comment #13 from Martin Sebor <msebor at gcc dot gnu.org> ---
Created attachment 40272
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40272&action=edit
Lightly tested patch.

(In reply to Martin Sebor from comment #6)

After some more testing, although the patch I showed happens to fix the problem
in the test case, it's not actually correct.  I found a few other subtle issues
in the function that need to fixed.  I'm testing a more comprehensive patch
that should fix it the right way.