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From: "ondra.hosek at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/26534] New: libm.so 2.32 SIGILL in pow() due to FMA4
 instruction on non-FMA4 system
Date: Tue, 25 Aug 2020 14:55:18 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26534

            Bug ID: 26534
           Summary: libm.so 2.32 SIGILL in pow() due to FMA4 instruction
                    on non-FMA4 system
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: ondra.hosek at gmail dot com
  Target Milestone: ---

Programs calling libm's pow() exit with SIGILL because it executes the FMA4
instruction

    vfmaddsd %xmm4,0x8(%rdx),%xmm6,%xmm0

on a system that does not support FMA4.

This is apparently due to a regression in commit
107e6a3c2212ba7a3a4ec7cae8d82d73f7c95d0b file
sysdeps/x86_64/fpu/multiarch/ifunc-fma4.h where the ifunc checks for "FMA"
instead of "FMA4".

Originally reported to Arch Linux: https://bugs.archlinux.org/task/67715

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