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From: "zack+gcc at buhman dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113193] New: [SH] ICE in gen_reg_rtx, at
 emit-rtl.cc:1177 with -mfcsa -funsafe-math-operations
Date: Tue, 02 Jan 2024 01:52:51 +0000
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X-Bugzilla-Product: gcc
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X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: ice-on-valid-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113193

            Bug ID: 113193
           Summary: [SH] ICE in gen_reg_rtx, at emit-rtl.cc:1177 with
                    -mfcsa -funsafe-math-operations
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zack+gcc at buhman dot org
  Target Milestone: ---
            Target: sh*-*-*

Created attachment 56971
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D56971&action=3Dedit
-freport-bug

On the sh*-*-* target it is possible to generate an ICE at all optimization
levels above -O0 with -mfcsa -funsafe-math-optimizations , for certain
sequences of valid code that contain __builtin_cosf and/or __builtin_sinf.

The attached -freport-bug output is one (500-line) example that only appear=
s to
trigger this ICE at -O3, but other (perhaps more convoluted) examples are
possible.

This affects all GCC versions between at least 9.5.0 and the current 14.0
master, inclusive. I did not test GCC versions older than 9.5.0.=