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

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_STORE <8 x s1>,p0 NEW
Occurrences:	358 in 217 configs, 109 test files
Snippet from:	rvp-bitcast-const-fold.4f260f0c9a.ll (mutant of rvp-bitcast-const-fold.ll) @pnot_v8i8 via llvm-extract + llvm-reduce
Config:	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	https://godbolt.org/z/bTaa47fMY (llc-assertions-trunk, checked 2026-10-15 08:04 UTC): G reproduces

Snippet:

define i64 @pnot_v8i8() {
  store <8 x i1> zeroinitializer, ptr null, align 1
  ret i64 0
}

Compiler Explorer panes:

Pane	Options	Exit	Insts	stderr
GlobalISel	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*`	0	3	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: pnot_v8i8) warning: Instruction selection used fallback path for pnot_v8i8
SelectionDAG (control)	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel=0`	0	3	-

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: pnot_v8i8)
warning: Instruction selection used fallback path for pnot_v8i8

Occurrences (358) (first 50):

Input	Function	Config
abdu-neg.01216760b5.ll (mutant of abdu-neg.ll)	abd_minmax_i32	`-mtriple=riscv32`
abdu-neg.a9b9cf0d02.ll (mutant of abdu-neg.ll)	abd_minmax_i32	`-mtriple=riscv32 -mattr=+zbb`
abdu-neg.c883361c8b.ll (mutant of abdu-neg.ll)	abd_minmax_i32	`-mtriple=riscv64`
abdu-neg.cf221fc1e3.ll (mutant of abdu-neg.ll)	abd_minmax_i32	`-mtriple=riscv64 -mattr=+zbb`
alloca.bf937d2849.ll (mutant of alloca.ll)	alloca_callframe	`-mtriple=riscv32 -verify-machineinstrs`
alu16.2c5d2191e6.ll (mutant of alu16.ll)	slt	`-mtriple=riscv32 -verify-machineinstrs`
alu16.6816a86a7c.ll (mutant of alu16.ll)	slt	`-mtriple=riscv64 -verify-machineinstrs`
alu8.1bcbaf5071.ll (mutant of alu8.ll)	slt	`-mtriple=riscv32 -verify-machineinstrs`
alu8.4acdc92f42.ll (mutant of alu8.ll)	slt	`-mtriple=riscv64 -verify-machineinstrs`
atomic-cmpxchg-branch-on-result.9b73ec6708.ll (mutant of atomic-cmpxchg-branch-on-result.ll)	cmpxchg_and_branch2	`-mtriple=riscv64 -mattr=+a,+zacas -verify-machineinstrs`
atomic-cmpxchg-branch-on-result.9c74adde09.ll (mutant of atomic-cmpxchg-branch-on-result.ll)	cmpxchg_and_branch2	`-mtriple=riscv32 -mattr=+a,+zacas -verify-machineinstrs`
atomic-cmpxchg-branch-on-result.c5d32721f7.ll (mutant of atomic-cmpxchg-branch-on-result.ll)	cmpxchg_and_branch2	`-mtriple=riscv64 -mattr=+a -verify-machineinstrs`
atomic-cmpxchg-branch-on-result.eace0e2382.ll (mutant of atomic-cmpxchg-branch-on-result.ll)	cmpxchg_and_branch2	`-mtriple=riscv64 -mattr=+a,+zacas,+zabha -verify-machineinstrs`
atomic-cmpxchg-branch-on-result.fb8163ee4c.ll (mutant of atomic-cmpxchg-branch-on-result.ll)	cmpxchg_and_branch2	`-mtriple=riscv32 -mattr=+a -verify-machineinstrs`
atomic-fence.144acfcce7.ll (mutant of atomic-fence.ll)	fence_singlethread_seq_cst	`-mtriple=riscv64 -verify-machineinstrs`
atomic-fence.222b4e2bcd.ll (mutant of atomic-fence.ll)	fence_singlethread_seq_cst	`-mtriple=riscv64 -mattr=+zalrsc -verify-machineinstrs`
atomic-fence.33ebc0ad62.ll (mutant of atomic-fence.ll)	fence_singlethread_seq_cst	`-mtriple=riscv64 -mattr=+a,+ztso -verify-machineinstrs`
atomic-fence.5e716049cc.ll (mutant of atomic-fence.ll)	fence_singlethread_seq_cst	`-mtriple=riscv32 -verify-machineinstrs`
atomic-fence.a74af0f66e.ll (mutant of atomic-fence.ll)	fence_singlethread_seq_cst	`-mtriple=riscv64 -mattr=+a -verify-machineinstrs`
atomic-fence.bdc8799b28.ll (mutant of atomic-fence.ll)	fence_singlethread_seq_cst	`-mtriple=riscv32 -mattr=+a,+ztso -verify-machineinstrs`
atomic-fence.bf00ddb822.ll (mutant of atomic-fence.ll)	fence_singlethread_seq_cst	`-mtriple=riscv32 -mattr=+zalrsc -verify-machineinstrs`
atomic-fence.de527df626.ll (mutant of atomic-fence.ll)	fence_singlethread_seq_cst	`-mtriple=riscv32 -mattr=+a -verify-machineinstrs`
atomic-signext.771ff7613c.ll (mutant of atomic-signext.ll)	atomicrmw_sub_i32_monotonic	`-mtriple=riscv32 -mattr=+a -verify-machineinstrs`
atomic-signext.8ebd40b068.ll (mutant of atomic-signext.ll)	atomicrmw_sub_i32_monotonic	`-mtriple=riscv64 -mattr=+a -verify-machineinstrs`
atomic-signext.8f2f6824e4.ll (mutant of atomic-signext.ll)	atomicrmw_sub_i32_monotonic	`-mtriple=riscv64 -mattr=+a,+zacas -verify-machineinstrs`
atomic-signext.b576705fe7.ll (mutant of atomic-signext.ll)	atomicrmw_sub_i32_monotonic	`-mtriple=riscv64 -verify-machineinstrs`
atomic-signext.bf1bedc2eb.ll (mutant of atomic-signext.ll)	atomicrmw_sub_i32_monotonic	`-mtriple=riscv32 -mattr=+a,+zacas -verify-machineinstrs`
atomic-signext.eb19c3d2f5.ll (mutant of atomic-signext.ll)	atomicrmw_sub_i32_monotonic	`-mtriple=riscv32 -verify-machineinstrs`
atomic-signext.f0e952fe98.ll (mutant of atomic-signext.ll)	atomicrmw_sub_i32_monotonic	`-mtriple=riscv64 -mattr=+zalrsc -verify-machineinstrs`
atomic-signext.f517636143.ll (mutant of atomic-signext.ll)	atomicrmw_sub_i32_monotonic	`-mtriple=riscv32 -mattr=+zalrsc -verify-machineinstrs`
bigendian-double-bitmanip.b2e2a64b5d.ll (mutant of bigendian-double-bitmanip.ll)	fcopysign	`-mtriple=riscv32 -target-abi=ilp32 -mattr=+d -verify-machineinstrs`
bitint-fp-conv-200.3555b31673.ll (mutant of bitint-fp-conv-200.ll)	test_float_to_bitint_200	`-mtriple=riscv32 -verify-machineinstrs`
bitint-fp-conv-200.e5ea6fc3c1.ll (mutant of bitint-fp-conv-200.ll)	test_float_to_bitint_200	`-mtriple=riscv64 -verify-machineinstrs`
byval.eabb6e7114.ll (mutant of byval.ll)	callee	`-mtriple=riscv32 -verify-machineinstrs`
callee-saved-fpr32s.180b2bec7e.ll (mutant of callee-saved-fpr32s.ll)	callee	`-mtriple=riscv32 -mattr=+f -target-abi ilp32f -verify-machineinstrs`
callee-saved-fpr32s.29ed9cbd76.ll (mutant of callee-saved-fpr32s.ll)	callee	`-mtriple=riscv32 -mattr=+d -target-abi ilp32d -verify-machineinstrs`
callee-saved-fpr32s.556521cac5.ll (mutant of callee-saved-fpr32s.ll)	callee	`-mtriple=riscv32 -mattr=+f -target-abi ilp32e -verify-machineinstrs`
callee-saved-fpr32s.771c45f097.ll (mutant of callee-saved-fpr32s.ll)	callee	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
callee-saved-fpr32s.be0e178e1d.ll (mutant of callee-saved-fpr32s.ll)	callee	`-mtriple=riscv32 -mattr=+f -target-abi ilp32 -verify-machineinstrs`
callee-saved-fpr32s.c444fd1223.ll (mutant of callee-saved-fpr32s.ll)	callee	`-mtriple=riscv64 -mattr=+f -target-abi lp64e -verify-machineinstrs`
callee-saved-fpr32s.ecb56e7880.ll (mutant of callee-saved-fpr32s.ll)	callee	`-mtriple=riscv64 -mattr=+f -target-abi lp64 -verify-machineinstrs`
callee-saved-fpr32s.fbfa252cf9.ll (mutant of callee-saved-fpr32s.ll)	callee	`-mtriple=riscv64 -mattr=+f -target-abi lp64f -verify-machineinstrs`
callee-saved-fpr64s.319e5c53b2.ll (mutant of callee-saved-fpr64s.ll)	callee	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
callee-saved-fpr64s.e10e8199dc.ll (mutant of callee-saved-fpr64s.ll)	callee	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs`
callee-saved-fpr64s.efbac46b9b.ll (mutant of callee-saved-fpr64s.ll)	callee	`-mtriple=riscv32 -mattr=+d -target-abi ilp32d -verify-machineinstrs`
calling-conv-half.05c73b6bae.ll (mutant of calling-conv-half.ll)	caller_half_ret	`-mtriple=riscv64 -mattr=+f,+zfhmin -target-abi=lp64f -verify-machineinstrs`
calling-conv-half.31eecf6760.ll (mutant of calling-conv-half.ll)	caller_half_ret	`-mtriple=riscv64 -mattr=+f -target-abi=lp64 -verify-machineinstrs`
calling-conv-half.612c2d5253.ll (mutant of calling-conv-half.ll)	caller_half_ret	`-mtriple=riscv32 -mattr=+f,+zfhmin -target-abi=ilp32f -verify-machineinstrs`
calling-conv-half.65d2a76af9.ll (mutant of calling-conv-half.ll)	caller_half_ret	`-mtriple=riscv32 -mattr=+f -mattr=+zfh -verify-machineinstrs -target-abi ilp32f -O1`
calling-conv-half.a81d2acd78.ll (mutant of calling-conv-half.ll)	caller_half_ret	`-mtriple=riscv64 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.