[Bug target/69038] compilation error: unable to find a register to spill in class 'FP_REGS'

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69038

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
(insn 1237 1236 1238 9 (set (reg:DF 32 %f0)
        (float:DF (reg:SI 2027 [ MEM[base: in_140, index: _139, offset: 0B]+-3
]))) pr69038.C:647 155 {floatsidf2}
     (expr_list:REG_DEAD (reg:SI 2027 [ MEM[base: in_140, index: _139, offset:
0B]+-3 ])
        (nil)))

Spilling for insn 1237.
reload failure for reload 0

Reloads for insn # 1237
Reload 0: reload_in (SI) = (reg:SI 2027 [ MEM[base: in_140, index: _139,
offset: 0B]+-3 ])
        FP_REGS, RELOAD_FOR_INPUT (opnum = 1)
        reload_in_reg: (reg:SI 2027 [ MEM[base: in_140, index: _139, offset:
0B]+-3 ])

But AFAICS %f0 could be used as reload register here thanks to the REG_DEAD
note...  It's probably too late to implement this in reload though.