fallback: legalize: G_STORE <32 x s1>,p0

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_STORE <32 x s1>,p0 NEW
Occurrences:	11 in 9 configs, 3 test files
Snippet from:	fastcc-without-f-reg.1946ee5744.ll (mutant of fastcc-without-f-reg.ll) @callee_float_32 via llvm-extract + llvm-reduce
Config:	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	https://godbolt.org/z/K9bzaoe1v (llc-assertions-trunk, checked 2026-10-14 11:49 UTC): G reproduces

Snippet:

define fastcc float @callee_float_32() {
  store <32 x i1> zeroinitializer, ptr null, align 4
  ret float 0.000000e+00
}

Compiler Explorer panes:

Pane	Options	Exit	Insts	stderr
GlobalISel	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*`	0	6	remark: <unknown>:0:0: unable to legalize instruction: G_STORE %0:_(<32 x s1>), %2:_(p0) :: (store (<32 x s1>) into `ptr null`) (in function: callee_float_32) warning: Instruction selection used fallback path for callee_float_32
SelectionDAG (control)	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -global-isel=0`	0	6	-

Reproduce:

llc -mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: G_STORE %0:_(<32 x s1>), %2:_(p0) :: (store (<32 x s1>) into `ptr null`) (in function: callee_float_32)
warning: Instruction selection used fallback path for callee_float_32

Occurrences (11):

Input	Function	Config
combine-storetomstore.a4a532a88e.ll (mutant of combine-storetomstore.ll)	test_masked_store_success_v32i16	`-mtriple=riscv64-- -mattr=+m,+v,+f`
double_reduct.3844ced8ae.ll (mutant of double_reduct.ll)	add_ext_v32i16	`-mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs`
double_reduct.5fd21faeb6.ll (mutant of double_reduct.ll)	add_ext_v32i16	`-mtriple=riscv64 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=lp64d -verify-machineinstrs`
double_reduct.799e3b7e5f.ll (mutant of double_reduct.ll)	add_ext_v32i16	`-mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs`
double_reduct.d6d255ac6c.ll (mutant of double_reduct.ll)	add_ext_v32i16	`-mtriple=riscv64 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=lp64d -verify-machineinstrs`
fastcc-without-f-reg.1946ee5744.ll (mutant of fastcc-without-f-reg.ll)	callee_float_32	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs`
fastcc-without-f-reg.1a8586865f.ll (mutant of fastcc-without-f-reg.ll)	callee_float_32	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs`
fastcc-without-f-reg.3ae3d55e73.ll (mutant of fastcc-without-f-reg.ll)	callee_float_32	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs`
fastcc-without-f-reg.50437c72e2.ll (mutant of fastcc-without-f-reg.ll)	callee_float_32	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs`
fastcc-without-f-reg.cd513577e5.ll (mutant of fastcc-without-f-reg.ll)	callee_float_32	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`
fastcc-without-f-reg.d2f3727de3.ll (mutant of fastcc-without-f-reg.ll)	callee_float_32	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.