[Bug inline-asm/99015] New: ICE: Max. number of generated reload insns per insn is achieved (90)

[Bug inline-asm/99015] New: ICE: Max. number of generated reload insns per insn is achieved (90)

[zhan3299 at purdue dot edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

            Bug ID: 99015
           Summary: ICE: Max. number of generated reload insns per insn is
                    achieved (90)
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhan3299 at purdue dot edu
  Target Milestone: ---

Another inline-asm issue causes an ICE.

--- poc.c starts ---
int main() {
    asm("" : : "fq"(.100));
}
--- poc.c ends ---

The version of GCC is 10.2.0 x86-64, and running 'gcc -O1 poc.c ' can trigger
the ICE.

--- error trace starts ---
$ gcc -O1 poc.c
during RTL pass: reload
test.c: In function ‘main’:
test.c:3:1: internal compiler error: maximum number of generated reload insns
per insn achieved (90)
    3 | }
      | ^
0x9fb0c0 lra_constraints(bool)
        ../../gcc/gcc/lra-constraints.c:4952
0x9e9314 lra(_IO_FILE*)
        ../../gcc/gcc/lra.c:2440
0x9a7201 do_reload
        ../../gcc/gcc/ira.c:5523
0x9a7201 execute
        ../../gcc/gcc/ira.c:5709
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
--- error trace ends ---


This issue only occurs when compiling with -O1 and higher, but does not with
-O0.

I also test other versions of GCC. It seems to affect GCC version 8.1 and
higher, but not version 7.5 and lower.


This issue may be similar with
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98991. However, as #98991
additionally affects GCC version 7.5 and lower, I suspect they are different.

[Bug inline-asm/99015] ICE: Max. number of generated reload insns per insn is achieved (90)

[zhan3299 at purdue dot edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

--- Comment #1 from zhan3299 at purdue dot edu ---
It seems clang at any optimization level can compile this. GCC at -O0 can also
compile it.

[Bug rtl-optimization/99015] [9/10/11/12 Regression] ICE: Max. number of generated reload insns per insn is achieved (90)

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ICE: Max. number of         |[9/10/11/12 Regression]
                   |generated reload insns per  |ICE: Max. number of
                   |insn is achieved (90)       |generated reload insns per
                   |                            |insn is achieved (90)
      Known to work|                            |7.1.0, 7.5.0
   Target Milestone|---                         |9.5
          Component|inline-asm                  |rtl-optimization
      Known to fail|                            |12.0, 8.1.0
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|                            |2021-09-14

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

[Bug rtl-optimization/99015] [9/10/11/12 Regression] ICE: Max. number of generated reload insns per insn is achieved (90)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
   Last reconfirmed|2021-09-14 00:00:00         |2022-1-21

[Bug rtl-optimization/99015] [10/11/12/13 Regression] ICE: Max. number of generated reload insns per insn is achieved (90)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.5                         |10.4

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9 branch is being closed

[Bug rtl-optimization/99015] [10/11/12/13 Regression] ICE: Max. number of generated reload insns per insn is achieved (90)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.4                        |10.5

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 10.4 is being released, retargeting bugs to GCC 10.5.

[Bug rtl-optimization/99015] [11/12/13/14 Regression] ICE: Max. number of generated reload insns per insn is achieved (90)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.5                        |11.5

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10 branch is being closed.

[Bug rtl-optimization/99015] [11/12/13 Regression] ICE: Max. number of generated reload insns per insn is achieved (90)

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

Jeffrey A. Law <law at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[11/12/13/14 Regression]    |[11/12/13 Regression] ICE:
                   |ICE: Max. number of         |Max. number of generated
                   |generated reload insns per  |reload insns per insn is
                   |insn is achieved (90)       |achieved (90)
                 CC|                            |law at gcc dot gnu.org

--- Comment #6 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Works on the trunk, gcc-13 still fails.  Removing gcc-14 regression marker.

[Bug rtl-optimization/99015] [11/12/13 Regression] ICE: Max. number of generated reload insns per insn is achieved (90)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99015

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2022-01-21 00:00:00         |2024-5-8
           Keywords|                            |needs-bisection

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
What fixed it?