fallback: legalize: G_SREM <4 x s64>

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_SREM <4 x s64>
Occurrences:	12 in 4 configs, 1 test files
Snippet from:	srem-vector-lkk.ll @dont_fold_srem_i64 via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define <4 x i64> @dont_fold_srem_i64(<4 x i64> %x) #0 {
  %1 = srem <4 x i64> %x, <i64 1, i64 654, i64 23, i64 5423>
  ret <4 x i64> %1
}

attributes #0 = { nounwind }

Reproduce:

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

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %8:_(<4 x s64>) = G_SREM %0:_, %3:_ (in function: dont_fold_srem_i64)
warning: Instruction selection used fallback path for dont_fold_srem_i64

Occurrences (12):

Input	Function	Config
srem-vector-lkk.ll	dont_fold_srem_i64	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
srem-vector-lkk.ll	dont_fold_srem_i64	`-mtriple=riscv32 -verify-machineinstrs`
srem-vector-lkk.ll	dont_fold_srem_i64	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
srem-vector-lkk.ll	dont_fold_srem_i64	`-mtriple=riscv64 -verify-machineinstrs`
srem-vector-lkk.38ef9917cb.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_i64	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
srem-vector-lkk.5481269b0c.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_i64	`-mtriple=riscv32 -verify-machineinstrs`
srem-vector-lkk.628907b942.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_i64	`-mtriple=riscv64 -verify-machineinstrs`
srem-vector-lkk.7f45f5d2cb.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_i64	`-mtriple=riscv32 -verify-machineinstrs`
srem-vector-lkk.8ba1dd6d9d.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_i64	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
srem-vector-lkk.985d95a682.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_i64	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
srem-vector-lkk.a019eea3aa.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_i64	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
srem-vector-lkk.e63f274f57.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_i64	`-mtriple=riscv64 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.