https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79752
--- Comment #2 from Michael Meissner <meissner at linux dot vnet.ibm.com> --- On Tue, Feb 28, 2017 at 09:13:42PM +0000, acsawdey at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79752 > > --- Comment #1 from acsawdey at gcc dot gnu.org --- > Meissner spotted the cause. Verified that this fixes it: > > Index: ../trunk/gcc/config/rs6000/rs6000.md > =================================================================== > --- ../trunk/gcc/config/rs6000/rs6000.md (revision 245787) > +++ ../trunk/gcc/config/rs6000/rs6000.md (working copy) > @@ -3161,7 +3161,7 @@ > && ! reg_mentioned_p (operands[3], operands[1]) > && ! reg_mentioned_p (operands[3], operands[2])" > [(set (match_dup 0) > - (div:GPR (match_dup 1) > + (udiv:GPR (match_dup 1) > (match_dup 2))) > (set (match_dup 3) > (mult:GPR (match_dup 0) > > Now to bootstrap/regtest this and post. One minor formatting nit. When you change div -> udiv, you will need to indent the (match_dup 20 on the next line by one space.
