https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97971
Bug ID: 97971
Summary: [9/10/11 Regression] ICE in process_alt_operands, at
lra-constraints.c:3110
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
Started with r9 between 20181104 and 20181111 :
$ cat z1.c
int f ()
{
register _Complex a asm ("rax");
register int b asm ("rdx");
asm ("abc %0 %1" : "=&r" (a), "=r" (b));
return a;
}
$ gcc-11-20201122 -c z1.c
z1.c: In function 'f':
z1.c:7:1: error: unable to generate reloads for impossible constraints:
7 | }
| ^
(insn 5 2 6 2 (parallel [
(set (reg/v:DC 0 ax [ a ])
(asm_operands:DC ("abc %0 %1") ("=&r") 0 []
[]
[] z1.c:5))
(set (reg/v:SI 1 dx [ b ])
(asm_operands:SI ("abc %0 %1") ("=r") 1 []
[]
[] z1.c:5))
(clobber (reg:CC 17 flags))
]) "z1.c":5:3 -1
(expr_list:REG_UNUSED (reg:CC 17 flags)
(expr_list:REG_UNUSED (reg/v:SI 1 dx [ b ])
(expr_list:REG_UNUSED (reg:DI 1 dx)
(nil)))))
during RTL pass: reload
z1.c:7:1: internal compiler error: in process_alt_operands, at
lra-constraints.c:3110
0x5f12f5 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../gcc/rtl-error.c:108
0x9de587 process_alt_operands
../../gcc/lra-constraints.c:3109
0x9e190b curr_insn_transform
../../gcc/lra-constraints.c:4073
0x9e4646 lra_constraints(bool)
../../gcc/lra-constraints.c:5138
0x9d28e2 lra(_IO_FILE*)
../../gcc/lra.c:2331
0x98dde9 do_reload
../../gcc/ira.c:5802
0x98dde9 execute
../../gcc/ira.c:5988
