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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105431] ICE: SIGSEGV in powi_as_mults_1
 (tree-ssa-math-opts.cc:1512) with -Ofast and __builtin_pow()
Date: Fri, 29 Apr 2022 06:45:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105431

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I can't reproduce in my dev tree but I guess the following will fix it?

diff --git a/gcc/tree-ssa-math-opts.cc b/gcc/tree-ssa-math-opts.cc
index 7555793948e..f3efd1ef4b2 100644
--- a/gcc/tree-ssa-math-opts.cc
+++ b/gcc/tree-ssa-math-opts.cc
@@ -1495,7 +1495,7 @@ powi_cost (HOST_WIDE_INT n)

 static tree
 powi_as_mults_1 (gimple_stmt_iterator *gsi, location_t loc, tree type,
-                HOST_WIDE_INT n, tree *cache)
+                unsigned HOST_WIDE_INT n, tree *cache)
 {
   tree op0, op1, ssa_target;
   unsigned HOST_WIDE_INT digit;
@@ -1548,7 +1548,7 @@ powi_as_mults (gimple_stmt_iterator *gsi, location_t =
loc,
   memset (cache, 0, sizeof (cache));
   cache[1] =3D arg0;

-  result =3D powi_as_mults_1 (gsi, loc, type, (n < 0) ? -n : n, cache);
+  result =3D powi_as_mults_1 (gsi, loc, type, absu_hwi (n), cache);
   if (n >=3D 0)
     return result;=