https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112512
Bug ID: 112512
Summary: GCC: 14: internal compiler error: in
lra_split_hard_reg_for, at lra-assigns.cc:1861
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: 141242068 at smail dot nju.edu.cn
Target Milestone: ---
Compiler Explorer: https://gcc.godbolt.org/z/jG4PfK845
When compiling this program with `gcc-14 -Og`, gcc ICEs:
```
extern int f();
int f1(char *s) {
return f();
}
int f2(char *s) {
return (f1(s) / f1(s)) && f1(s);
}
register int v asm("%rax"); // both rax and eax are able to trigger the crash
char *f3(char *s) {}
```
The output of crash log:
```
<source>:11:14: warning: call-clobbered register used for global register
variable
11 | register int v asm("%rax");
| ^
<source>: In function 'f2':
<source>:9:1: error: unable to find a register to spill
9 | }
| ^
<source>:9:1: error: this is the insn:
(insn 14 40 37 2 (parallel [
(set (reg:SI 107 [orig:98 _1 ] [98])
(div:SI (reg:SI 107 [orig:98 _1 ] [98])
(reg:SI 0 ax)))
(set (reg:SI 103)
(mod:SI (reg:SI 107 [orig:98 _1 ] [98])
(reg:SI 0 ax)))
(clobber (reg:CC 17 flags))
]) "<source>":8:17 discrim 2 539 {*divmodsi4}
(expr_list:REG_UNUSED (reg:SI 103)
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil))))
during RTL pass: reload
<source>:9:1: internal compiler error: in lra_split_hard_reg_for, at
lra-assigns.cc:1861
0x238b06e internal_error(char const*, ...)
???:0
0xa1125c fancy_abort(char const*, int, char const*)
???:0
0x827c80 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
???:0
0xf202e5 lra_split_hard_reg_for()
???:0
0xf1a459 lra(_IO_FILE*)
???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
```
