fallback: legalize: G

fallback: legalize: G_OR <2 x s64>

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_OR <2 x s64> NEW
Occurrences:	538 in 493 configs, 69 test files
Snippet from:	xqcilia-addimm-mulimm-loop.22a3a035f8.ll (mutant of xqcilia-addimm-mulimm-loop.ll) @mul_add_simm26 via llvm-extract + llvm-reduce
Config:	`-mtriple=riscv32 -mattr=+xqcilia -verify-machineinstrs`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	https://godbolt.org/z/4dnh8GP51 (llc-assertions-trunk, checked 2026-10-14 11:49 UTC): G reproduces

Snippet:

define <2 x i64> @mul_add_simm26(<2 x i64> %LGV) {
  %B = or <2 x i64> %LGV, splat (i64 1)
  ret <2 x i64> %B
}

Compiler Explorer panes:

Pane	Options	Exit	Insts	stderr
GlobalISel	`-mtriple=riscv32 -mattr=+xqcilia -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*`	0	11	remark: <unknown>:0:0: unable to legalize instruction: %5:_(<2 x s64>) = G_OR %0:_, %3:_ (in function: mul_add_simm26) warning: Instruction selection used fallback path for mul_add_simm26
SelectionDAG (control)	`-mtriple=riscv32 -mattr=+xqcilia -verify-machineinstrs -global-isel=0`	0	11	-

Reproduce:

llc -mtriple=riscv32 -mattr=+xqcilia -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+xqcilia -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %5:_(<2 x s64>) = G_OR %0:_, %3:_ (in function: mul_add_simm26)
warning: Instruction selection used fallback path for mul_add_simm26

Occurrences (538) (first 50):

Input	Function	Config
addc-adde-sube-subc.855d1b03a0.ll (mutant of addc-adde-sube-subc.ll)	subc_sube	`-mtriple=riscv32 -verify-machineinstrs`
allow-check.18d43f4a0f.ll (mutant of allow-check.ll)	test_ubsan	`-mtriple=riscv64 -fast-isel=0`
allow-check.b57ba2dcb1.ll (mutant of allow-check.ll)	test_ubsan	`-mtriple=riscv32 -fast-isel=0`
attributes.01432981d1.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+ssctr`
attributes.014c7e9afc.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zicntr`
attributes.021b1b1220.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zicsr`
attributes.032a8d8082.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+m,+zmmul`
attributes.0344a8eb96.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+shvstvala`
attributes.03b81abc97.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+experimental-zvfbfa`
attributes.049a146eb4.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+experimental-rvm23u32`
attributes.0596847bd5.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zcd`
attributes.066b7bb40f.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zcb`
attributes.06b9a3b424.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+smaia`
attributes.072d8e4fe5.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zvfbfwma`
attributes.083bdf0463.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+ssccfg`
attributes.0954fe797b.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zve32x -mattr=+experimental-zvzip`
attributes.097fed76e4.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zicbom`
attributes.099cf0c586.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+sdext`
attributes.09d30c3c76.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zve32x -mattr=+experimental-zvqwdota8i`
attributes.0a942bd95a.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+q`
attributes.0c736b6788.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+f`
attributes.0d40b90d57.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+experimental-ssip`
attributes.0d4f998805.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zvfbfwma`
attributes.0d53fb9b26.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+xwchc`
attributes.0db924465f.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+experimental-sscsps`
attributes.0e443fd711.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zclsd`
attributes.0ef59eb9c0.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zknd`
attributes.0f38d1af18.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+experimental-ssnip`
attributes.0f52739ba2.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zalrsc`
attributes.0f6ce0f13d.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+ziccid`
attributes.0fc0723af2.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zbkb,+zbkc,+zbkx,+zkne,+zknd,+zknh`
attributes.100a52d497.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+experimental-zicfilp`
attributes.1169b5b136.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zihintntl`
attributes.12f8541ae6.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zcmp`
attributes.13fd2bb43d.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+smrnmi`
attributes.15063f98bb.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zbkb`
attributes.15a581d591.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+za128rs`
attributes.160ecab81e.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+experimental-smnip`
attributes.162f84e3e1.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+a --riscv-abi-attributes`
attributes.16415fb451.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zcmop`
attributes.16caf043d7.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+experimental-smpmpmt`
attributes.18047d8298.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+experimental-p`
attributes.18653fd271.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+svinval`
attributes.18f093bbb5.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zkt`
attributes.18fe273c45.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+smnpm`
attributes.195d277727.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+experimental-zibi`
attributes.1a8ffd1a53.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zaamo,+zalrsc`
attributes.1a90a9880b.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+q`
attributes.1b6ed69cad.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv64 -mattr=+zkt`
attributes.1de6662874.ll (mutant of attributes.ll)	atomic_load_i8_seq_cst	`-mtriple=riscv32 -mattr=+zksed`

Generated 2026-10-15 08:05 UTC.