fallback: legalize: G

fallback: legalize: G_XOR <4 x s32>

Run:	main-04ca53e65f-20261014-113325
Kind:	fallback
Category:	legalize: G_XOR <4 x s32> NEW
Occurrences:	12 in 12 configs, 4 test files
Snippet from:	half-zfa-fli.59183654e9.ll (mutant of half-zfa-fli.ll) @loadfpimm15 via llvm-extract + llvm-reduce
Config:	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	https://godbolt.org/z/zj5Ghh338 (llc-assertions-trunk, checked 2026-10-14 11:04 UTC): G reproduces

Snippet:

define <4 x i32> @loadfpimm15(<4 x i32> %LGV1) {
  %B = xor <4 x i32> zeroinitializer, %LGV1
  ret <4 x i32> %B
}

Compiler Explorer panes:

Pane	Options	Exit	Insts	stderr
GlobalISel	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*`	0	9	remark: <unknown>:0:0: unable to legalize instruction: %5:_(<4 x s32>) = G_XOR %3:_, %0:_ (in function: loadfpimm15) warning: Instruction selection used fallback path for loadfpimm15
SelectionDAG (control)	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh -global-isel=0`	0	9	-

Reproduce:

llc -mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %5:_(<4 x s32>) = G_XOR %3:_, %0:_ (in function: loadfpimm15)
warning: Instruction selection used fallback path for loadfpimm15

Occurrences (12):

Input	Function	Config
half-zfa-fli.59183654e9.ll (mutant of half-zfa-fli.ll)	loadfpimm15	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh`
half-zfa-fli.7d9ef8fa29.ll (mutant of half-zfa-fli.ll)	loadfpimm15	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfhmin`
half-zfa-fli.8134695766.ll (mutant of half-zfa-fli.ll)	loadfpimm15	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh`
half-zfa-fli.8bd0927d2c.ll (mutant of half-zfa-fli.ll)	loadfpimm15	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin`
mem.ec64db8904.ll (mutant of mem.ll)	lw_really_far_local	`-mtriple=riscv32 -verify-machineinstrs`
mem64.cd683778c3.ll (mutant of mem64.ll)	st_far_local	`-mtriple=riscv64 -verify-machineinstrs`
nontemporal.36fffb5e0b.ll (mutant of nontemporal.ll)	test_nontemporal_ALL_store_i64	`-mtriple=riscv32 -mattr=+zihintntl,+f,+d,+zfh,+c`
nontemporal.5a59105fcf.ll (mutant of nontemporal.ll)	test_nontemporal_ALL_store_i64	`-mtriple=riscv64 -mattr=+zihintntl,+f,+d,+zfh,+c`
nontemporal.86ff13ff91.ll (mutant of nontemporal.ll)	test_nontemporal_ALL_store_i64	`-mtriple=riscv64 -mattr=+zihintntl,+f,+d,+zfh`
nontemporal.9d5907877a.ll (mutant of nontemporal.ll)	test_nontemporal_ALL_store_i64	`-mtriple=riscv64 -mattr=+zihintntl,+f,+d,+zfh,+v`
nontemporal.b161d32ed5.ll (mutant of nontemporal.ll)	test_nontemporal_ALL_store_i64	`-mtriple=riscv32 -mattr=+zihintntl,+f,+d,+zfh,+v`
nontemporal.f6d640b3a7.ll (mutant of nontemporal.ll)	test_nontemporal_ALL_store_i64	`-mtriple=riscv32 -mattr=+zihintntl,+f,+d,+zfh`

Generated 2026-10-15 08:05 UTC.