[Bug c/101953] bug on the default cast operator from double to unsigned short

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101953

--- Comment #14 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
MIPS64 does:
        trunc.w.d $f0,$f0 ; int

        c.le.d  $fcc0,$f1,$f0
        bc1t    $fcc0,.L2
        nop

        trunc.w.d $f0,$f0
        mfc1    $2,$f0
        b       .L3
        nop

.L2:
        sub.d   $f0,$f0,$f1
        li      $3,-2147483648                  # 0xffffffff80000000
        trunc.w.d $f0,$f0
        mfc1    $2,$f0
        or      $2,$2,$3
.L3: ; unsigned

So MIPS64 does a comparison to see if the float is greater than INT_MAX and
then does a subtraction and then conversion and then adds back INT_MAX.