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From: "fazedo at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96336] Multiple multiplications fails to
 optimize
Date: Mon, 27 Jul 2020 15:20:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96336

--- Comment #1 from Fabio Azevedo <fazedo at gmail dot com> ---
int f(int x) {
  return x*x*x*x*x*x*x*x*x*x*x*x*x*x*x*x; //x**16=20
}=20

int g(int x) {
  return x*x*x*x*x*x*x*x*x*x*x*x*x*x*x*x + x*x; //x**16 + x**2
}


Using gcc -O3, the first function simplifies to 4 integer multiplications w=
hile
the second function requires 13.=