[llvm-bugs] [Bug 46291] New: fatal error: error in backend: Cannot select: t3: i32 = fp_to_sint nofpexcept t2

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https://bugs.llvm.org/show_bug.cgi?id=46291

            Bug ID: 46291
           Summary: fatal error: error in backend: Cannot select: t3: i32
                    = fp_to_sint nofpexcept t2
           Product: libraries
           Version: 10.0
          Hardware: Other
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: pkubaj at anongoth.pl
                CC: llvm-bugs at lists.llvm.org

FreeBSD head, powerpc64 elfv2 or powerpc or powerpcspe, LLVM 10.0.1-rc1

Reproduction:
pkubaj at talos:$/usr/home/pkubaj/libretro-fbneo$ /usr/bin/cc -cc1 -triple
powerpc64-unknown-freebsd13.0 -emit-obj -frounding-math ym2612-5de3af.c
ym2612-5de3af.c:1:1: warning: type specifier missing, defaults to 'int'
a;
^
ym2612-5de3af.c:3:1: warning: type specifier missing, defaults to 'int'
c() { a = b; }
^
ym2612-5de3af.c:3:14: warning: non-void function does not return a value
c() { a = b; }
             ^
fatal error: error in backend: Cannot select: t3: i32 = fp_to_sint nofpexcept
t2
  t2: f64,ch = CopyFromReg t0, Register:f64 %5
    t1: f64 = Register %5
In function: c

Test case:
a;
double b;
c() { a = b; }

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