fallback: legalize: G_STORE <8 x s1>,p0

Run:explore-04ca53e65f-20261014-114124
Kind:fallback
Category:legalize: G_STORE <8 x s1>,p0 NEW
Occurrences:119 in 74 configs, 33 test files
Snippet from:rvp-bitcast-paired.01e5ad9501.ll (mutant of rvp-bitcast-paired.ll) @bitcast_roundtrip_v8i8 via llvm-extract + llvm-reduce
Config:-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs
Local check:reproduces at 04ca53e65f
Compiler Explorer:https://godbolt.org/z/szTeTxP13 (llc-assertions-trunk, checked 2026-10-14 11:49 UTC): G reproduces

Snippet:

define i64 @bitcast_roundtrip_v8i8() {
  store <8 x i1> zeroinitializer, ptr null, align 1
  ret i64 0
}

Compiler Explorer panes:

PaneOptionsExitInstsstderr
GlobalISel-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*03remark: <unknown>:0:0: unable to legalize instruction: G_STORE %0:_(<8 x s1>), %2:_(p0) :: (store (<8 x s1>) into `ptr null`) (in function: bitcast_roundtrip_v8i8)
warning: Instruction selection used fallback path for bitcast_roundtrip_v8i8
SelectionDAG (control)-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel=003-

Reproduce:

llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: G_STORE %0:_(<8 x s1>), %2:_(p0) :: (store (<8 x s1>) into `ptr null`) (in function: bitcast_roundtrip_v8i8)
warning: Instruction selection used fallback path for bitcast_roundtrip_v8i8

Occurrences (119) (first 50):

InputFunctionConfig
abds-neg.609ea8695e.ll (mutant of abds-neg.ll)abd_ext_i64-mtriple=riscv32
abds-neg.7d9d885c8d.ll (mutant of abds-neg.ll)abd_ext_i64-mtriple=riscv64
abds-neg.c00384c4e6.ll (mutant of abds-neg.ll)abd_ext_i64-mtriple=riscv32 -mattr=+zbb
abds-neg.d912f8c2cf.ll (mutant of abds-neg.ll)abd_ext_i64-mtriple=riscv64 -mattr=+zbb
add-imm.6e72877f95.ll (mutant of add-imm.ll)add_negative_low_bound_reject-mtriple=riscv64 -verify-machineinstrs
add-imm.bb69b5c338.ll (mutant of add-imm.ll)add_negative_low_bound_reject-mtriple=riscv32 -verify-machineinstrs
alu64.4a89ac940b.ll (mutant of alu64.ll)add-mtriple=riscv32 -verify-machineinstrs
alu64.622dd78eb0.ll (mutant of alu64.ll)add-mtriple=riscv64 -verify-machineinstrs
atomic-load-store.02a9ab7ad3.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv64 -mattr=+a,+ztso,+no-trailing-seq-cst-fence -verify-machineinstrs
atomic-load-store.050b57f762.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv64 -mattr=+a,+no-trailing-seq-cst-fence -verify-machineinstrs
atomic-load-store.1e7a43bed6.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv32 -mattr=+a,+no-trailing-seq-cst-fence -verify-machineinstrs
atomic-load-store.1fafa43522.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv64 -mattr=+a -verify-machineinstrs
atomic-load-store.4061acc33c.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv64 -mattr=+zalrsc -verify-machineinstrs
atomic-load-store.4e061ee334.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv32 -mattr=+a,+zalasr -verify-machineinstrs
atomic-load-store.544c4b0674.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv32 -mattr=+a,+zalasr,+ztso -verify-machineinstrs
atomic-load-store.9c2b697d1c.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv64 -mattr=+a,+ztso -verify-machineinstrs
atomic-load-store.a321135f82.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv64 -mattr=+a,+zalasr,+ztso -verify-machineinstrs
atomic-load-store.b25c996cc1.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv32 -mattr=+a -verify-machineinstrs
atomic-load-store.bbd45376aa.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv32 -mattr=+a,+ztso -verify-machineinstrs
atomic-load-store.c95568b015.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv32 -verify-machineinstrs
atomic-load-store.ce10c78349.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv64 -verify-machineinstrs
atomic-load-store.d049d91f67.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv64 -mattr=+a,+zalasr -verify-machineinstrs
atomic-load-store.e82ffc828b.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv32 -mattr=+a,+ztso,+no-trailing-seq-cst-fence -verify-machineinstrs
atomic-load-store.efd659f271.ll (mutant of atomic-load-store.ll)atomic_load_i32_monotonic-mtriple=riscv32 -mattr=+zalrsc -verify-machineinstrs
atomic-rmw.00a75a521c.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -verify-machineinstrs
atomic-rmw.07beb808e2.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+a -verify-machineinstrs
atomic-rmw.137126f563.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -verify-machineinstrs
atomic-rmw.2e83a4de4b.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+a,+ztso,+zacas -verify-machineinstrs
atomic-rmw.30dbff0d01.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+a,+ztso -verify-machineinstrs
atomic-rmw.3f4c54aeb3.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+a,+ztso,+zabha,+zacas -verify-machineinstrs
atomic-rmw.5fbba7b711.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+zalrsc -verify-machineinstrs
atomic-rmw.633cb1b246.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+a,+zabha,+zacas -verify-machineinstrs
atomic-rmw.66a277a7c9.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+a,+ztso,+zabha,+zacas -verify-machineinstrs
atomic-rmw.677bec08c7.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+a -verify-machineinstrs
atomic-rmw.787d1ebf88.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+a,+ztso -verify-machineinstrs
atomic-rmw.864c618fe2.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+a,+ztso,+zabha -verify-machineinstrs
atomic-rmw.98fc65e972.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+a,+ztso,+zacas -verify-machineinstrs
atomic-rmw.9f29f666f7.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+a,+ztso,+zabha -verify-machineinstrs
atomic-rmw.a64a90fbad.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+a,+zacas -verify-machineinstrs
atomic-rmw.c41aa29eb7.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+zalrsc -verify-machineinstrs
atomic-rmw.cf9047226d.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+a,+zabha -verify-machineinstrs
atomic-rmw.db7c3e4320.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv64 -mattr=+a,+zabha -verify-machineinstrs
atomic-rmw.dc1845ed86.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+a,+zabha,+zacas -verify-machineinstrs
atomic-rmw.e1f15f0ced.ll (mutant of atomic-rmw.ll)atomicrmw_or_i8_acq_rel-mtriple=riscv32 -mattr=+a,+zacas -verify-machineinstrs
combine-storetomstore.37bf375318.ll (mutant of combine-storetomstore.ll)test_masked_store_success_v8i16-mtriple=riscv64-- -mattr=+m,+v,+f
div.140da5d07d.ll (mutant of div.ll)udiv8_pow2-mtriple=riscv64 -verify-machineinstrs
div.79d8b5dd76.ll (mutant of div.ll)udiv8_pow2-mtriple=riscv64 -mattr=+m -verify-machineinstrs
div.8719cc0347.ll (mutant of div.ll)udiv8_pow2-mtriple=riscv32 -verify-machineinstrs
div.a1ec4fbe56.ll (mutant of div.ll)udiv8_pow2-mtriple=riscv32 -mattr=+m -verify-machineinstrs
double-select-fcmp.0903e8ae04.ll (mutant of double-select-fcmp.ll)select_fcmp_ord-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d

Generated 2026-10-15 08:05 UTC.