http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58048
--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
Looking a bit into this problem:
A reload reg is inserted before "fscale" asm, but the chosen alternative can
move an immediate to memory directly.
Inserting insn reload before:
227: r184:SI=0x20
alt=0,overall=13,losers=2,rld_nregs=1
alt=1,overall=9,losers=1,rld_nregs=0
alt=4,overall=19,losers=2 -- reject
alt=10,overall=19,losers=2 -- reject
Choosing alt 1 in insn 227: (0) m (1) re {*movsi_internal}
Creating newreg=185 from oldreg=184, assigning class NO_REGS to r185
227: r185:SI=0x20
Inserting insn reload after:
The alternative does not need a register, so class NO_REGS is correct. However,
it looks that follow-up code is not prepared for this and trips into a loop,
trying to assign another reload reg.
