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From: "luoxhu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103802] [12 regression] recip-3.c fails after
 r12-6087 on Power m32
Date: Wed, 29 Dec 2021 02:29:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103802

--- Comment #4 from luoxhu at gcc dot gnu.org ---
Or restore the previous recip count check by comment out the if condition to
avoid bb in loop turns cold?

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/recip-3.c
b/gcc/testsuite/gcc.dg/tree-ssa/recip-3.c
index 641c91e719e..d3c3053486d 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/recip-3.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/recip-3.c
@@ -14,7 +14,13 @@ float h ()
        E =3D 1. - d;

        for( i=3D0; i < 2; i++ )
-               if( d > 0.01 )
+               // if( d > 0.01 )
+               /* The if condition will make followed bb cold (profile cou=
nt
+                  less then the loop preheader), while r12-6087 is a
+                  optimization that avoids move COLD invariant expression =
out
+                  of loop, since this test case is to test recip expression
+                  could be CSE and eliminated, so comment the condition to
keep
+                  the test point.  */
                {
                        P =3D ( W < E ) ? (W - E)/d : (E - W)/d;
                        F[i] +=3D P;
@@ -23,4 +29,4 @@ float h ()
        F[0] +=3D E / d;
 }

-/* { dg-final { scan-tree-dump-times " / " 5 "recip" } } */
+/* { dg-final { scan-tree-dump-times " / " 1 "recip" } } */=