[Bug target/79752] incorrect code generation for __divkf3 with -O2 -mcpu=power9

[acsawdey at gcc dot gnu.org]

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.