https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84564
Bug ID: 84564
Summary: error: unable to find a register to spill with
-mforce-indirect-call
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: ak at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-unknown-linux-gnu
Target: i586-linux-gnu
Starting from r254560, we ICE on:
$ cat ./subsumption.i
int a, b;
int h (void);
static int c (int d, int f, int g)
{
while (a)
h () && c (d, f, g);
}
int x;
int i (void) { int e = c (x, b, e); }
$ gcc ./subsumption.i -O2 -mforce-indirect-call -c -m32
./subsumption.i: In function ‘i’:
./subsumption.i:9:1: error: unable to find a register to spill
int i (void) { int e = c (x, b, e); }
^~~
./subsumption.i:9:1: error: this is the insn:
(call_insn/j 9 18 10 2 (set (reg:SI 0 ax)
(call (mem:QI (reg/f:SI 92 [91]) [0 c S1 A8])
(const_int 0 [0]))) "./subsumption.i":9 693 {*sibcall_value}
(expr_list:REG_DEAD (reg/f:SI 92 [91])
(expr_list:REG_DEAD (reg:SI 2 cx)
(expr_list:REG_DEAD (reg:SI 1 dx)
(expr_list:REG_CALL_DECL (symbol_ref:SI ("c") [flags 0x3]
<function_decl 0x7ffff6922f00 c>)
(expr_list:REG_EH_REGION (const_int 0 [0])
(nil))))))
(expr_list:SI (use (reg:SI 0 ax))
(expr_list:SI (use (reg:SI 1 dx))
(expr_list:SI (use (reg:SI 2 cx))
(nil)))))
during RTL pass: reload
./subsumption.i:9:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1470
0x5b93a6 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../gcc/rtl-error.c:108
0xa48099 assign_by_spills
../../gcc/lra-assigns.c:1470
0xa48aa6 lra_assign()
../../gcc/lra-assigns.c:1664
0xa44134 lra(_IO_FILE*)
../../gcc/lra.c:2475
0x9f8561 do_reload
../../gcc/ira.c:5465
0x9f8561 execute
../../gcc/ira.c:5649
