ftn: an IF statement guarding STOP in device code: the STOP runs although its condition is false (target loop), or an internal compiler error (directly in a target region)

Legality: not independently confirmed. no independent review yet How this is checked

Same issue as catalog/cce-flang-stop-in-target-crash; this program is another reproducer of it.

Affected variants

Compiler	MI300A gfx942 unified memory (XNACK 1)	MI300A gfx942 copy (XNACK 0)	MI250X gfx90a copy (XNACK 0)	MI300X gfx942 copy (XNACK 0)	MI350X gfx950 copy (XNACK 0)	A100 sm_80 separate memory	A100 sm_80 managed memory
AFAR 24.3.0	correct	correct	correct	correct	correct	n/a	n/a
CCE 19.0.0	behaves incorrectly	behaves incorrectly	behaves incorrectly	unknown not run	unknown not run	n/a	n/a
CCE 20.0.2	behaves incorrectly	behaves incorrectly	behaves incorrectly	unknown not run	unknown not run	n/a	n/a
CCE 21.0.3	behaves incorrectly	behaves incorrectly	behaves incorrectly	unknown not run	unknown not run	n/a	n/a
CCE 21.0.4	behaves incorrectly	behaves incorrectly	behaves incorrectly	unknown not run	unknown not run	n/a	n/a
NVHPC 25.11	n/a	n/a	n/a	n/a	n/a	correct	correct
NVHPC 26.9	n/a	n/a	n/a	n/a	n/a	correct	correct
GCC 16.2.0	correct	correct	correct	correct	correct	correct	n/a

"behaves incorrectly" / "not supported": this issue, confirmed in up to four environments (another build directory, another node, a repeat). "fails another way": a different failure, not counted as this issue. "unknown": not run there, or the runs disagree.

Messages

Result	Compiler and GPU	Message
behaves incorrectly	CCE 19.0.0, MI300A unified CCE 19.0.0, MI300A copy CCE 19.0.0, MI250X	show Warning: Headers and libraries from cray-libsci/25.03.0 will be ignored because depends on PE_MPICH which is unavailable.. Error message :: COND PDG 20 with no stmts. Error detected :: File '/workspace/crayftn/pdgcs/v_fs.c', line 2323 Initiated from :: Line 862 (v_main.c) Optimizer built :: 2025-02-07 (production) File :: cce-if-stop-in-target-ice-one-condition.f90 Function :: p
behaves incorrectly	CCE 20.0.2, MI300A unified CCE 20.0.2, MI300A copy CCE 20.0.2, MI250X	show Warning: Headers and libraries from cray-libsci/25.09.0 will be ignored because depends on PE_MPICH which is unavailable.. Error message :: COND PDG 20 with no stmts. Error detected :: File '/workspace/crayftn/pdgcs/v_fs.c', line 2325 Initiated from :: Line 862 (v_main.c) Optimizer built :: 2025-11-17 (production) File :: cce-if-stop-in-target-ice-one-condition.f90 Function :: p
behaves incorrectly	CCE 21.0.3, MI300A unified CCE 21.0.3, MI300A copy CCE 21.0.3, MI250X	show Warning: Headers and libraries from cray-libsci/26.03.0 will be ignored because depends on PE_MPICH which is unavailable.. Error message :: COND PDG 20 with no stmts. Error detected :: File '/workspace/crayftn/pdgcs/v_fs.c', line 2325 Initiated from :: Line 934 (v_main.c) Optimizer built :: 2026-07-14 (production) File :: cce-if-stop-in-target-ice-one-condition.f90 Function :: p
behaves incorrectly	CCE 21.0.4, MI300A unified CCE 21.0.4, MI300A copy CCE 21.0.4, MI250X	show Warning: Headers and libraries from cray-libsci/26.03.0 will be ignored because depends on PE_MPICH which is unavailable.. Error message :: COND PDG 20 with no stmts. Error detected :: File '/workspace/crayftn/pdgcs/v_fs.c', line 2325 Initiated from :: Line 934 (v_main.c) Optimizer built :: 2026-09-24 (production) File :: cce-if-stop-in-target-ice-one-condition.f90 Function :: p

Reproduce

CCE 19.0.0, MI300A unified

module load cce/19.0.0 craype-accel-amd-gfx942 rocm/6.4.3
module unload cray-mpich
ftn -fopenmp -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

CCE 20.0.2, MI300A unified

module load cce/20.0.2 craype-accel-amd-gfx942 rocm/6.4.3
module unload cray-mpich
ftn -fopenmp -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

CCE 21.0.3, MI300A unified

module load cce/21.0.3 craype-accel-amd-gfx942 rocm/7.2.0
module unload cray-mpich
ftn -fopenmp -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

CCE 21.0.4, MI300A unified

module load cce/21.0.4 craype-accel-amd-gfx942 rocm/7.2.0
module unload cray-mpich
ftn -fopenmp -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

AFAR 24.3.0, MI300A unified (runs correctly)

$AFAR/bin/amdflang -fopenmp --offload-arch=gfx942 -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

Program (31 lines)

! # Finding (from the data/bench/fresh draft fresh-106): CCE ICE on an IF with one
!   operand that guards a STOP directly in a target region
!
! - the one-operand form of fresh/cce-if-stop-in-target-ice.f90 (see its header for the source):
!   `if (x /= 1) stop 1` directly in a target region; `if (allocated(j)) stop 1`,
!   `if (.not. allocated(j)) stop 1` and `if (allocated(j)) error stop 1` give the same ICE
!   (data/reports/fresh-drafts/d106-e2.f90, d106-e7.f90, d106-e6.f90; CCE 21 rejects the ERROR STOP
!   instead: "Non-localized coarray control/access statements are not allowed in an OpenMP
!   explicit region")
! - compilers: CCE 19.0.0, 20.0.2 and 21.0.3 ftn, -fopenmp -O2 (gfx942 and gfx90a)
! - expected: compiles and prints x 11 (OpenMP 5.2 §4.3 p.76 l.13-21: "A structured block ... may
!   contain STOP or ERROR STOP statements"); x is 1 on entry, so the STOP is not reached
! - actual: INTERNAL COMPILER ERROR "COND PDG 20 with no stmts." (pdgcs/v_fs.c line 2323 in CCE 19,
!   2325 in CCE 20 and 21)
! - control (same compiler): `if (x /= 1) x = -100` (data/reports/fresh-drafts/d106-r1-ctl.f90)
!   compiles and prints x 11
! - other families: AFAR compiles and prints x 11 (MI300A HSA_XNACK 1 and 0; MI250X)
! - related: catalog/cce-flang-stop-in-target-crash.f90
! - legality: legal by reading
! - evidence: results/fresh-drafts/tuo4-r*.jsonl, tioga/<host>.jsonl (d106-r1.f90, identical to the
!   program below), tuo2-q1.jsonl (d106-e3.f90, the same with an unused allocatable) (review)
program p
  implicit none
  integer :: x
  x = 1
  !$omp target map(tofrom: x)
    if (x /= 1) stop 1
    x = 11
  !$omp end target
  print *, 'x', x
end program p

Source in the repository

Something to add? Dispute its legality · Report it fixed in a newer release · Report a mistake on this page

Expected and observed

Observed where it behaves incorrectly

Warning:
 Headers and libraries from cray-libsci/25.03.0 will be ignored because depends on PE_MPICH which is unavailable..
   Error message      ::  COND PDG 20 with no stmts.
   Error detected     ::  File '/workspace/crayftn/pdgcs/v_fs.c', line 2323
   Initiated from     ::  Line 862 (v_main.c)
   Optimizer built    ::  2025-02-07 (production)
   File               ::  cce-if-stop-in-target-ice-one-condition.f90
   Function           ::  p

What the specification requires

The specification text this program relies on and the compiler is expected to support.

OpenMP 5.2 §4.3 p.76 l.13-21

A structured block ... may contain STOP or ERROR STOP statements

Evidence

Same compiler, one change

the IF with an assignment instead of STOP: AFAR 24.3.0: correct; CCE 19.0.0: correct; CCE 20.0.2: correct; CCE 21.0.3: correct; CCE 21.0.4: correct

Control program

program p
  implicit none
  integer :: x
  x = 1
  !$omp target map(tofrom: x)
    if (x /= 1) x = -100
    x = 11
  !$omp end target
  print *, 'x', x
end program p

Other compilers run it correctly

AFAR 24.3.0, NVHPC 25.11, NVHPC 26.9, GCC 16.2.0