fallback: legalize: G_UREM <4 x s16>

Run:explore-bc8218b282-20261015-075519
Kind:fallback
Category:legalize: G_UREM <4 x s16>
Occurrences:13 in 5 configs, 2 test files
Snippet from:rvp-simd-64.ll @test_purem_h via llvm-extract
Config:-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs
Local check:reproduces at bc8218b282
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

define <4 x i16> @test_purem_h(<4 x i16> %a, <4 x i16> %b) {
  %res = urem <4 x i16> %a, %b
  ret <4 x i16> %res
}

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: %2:_(<4 x s16>) = G_UREM %0:_, %1:_ (in function: test_purem_h)
warning: Instruction selection used fallback path for test_purem_h

Occurrences (13):

InputFunctionConfig
rvp-simd-64.lltest_purem_h-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs
urem-vector-lkk.lldont_fold_urem_i16_smax-mtriple=riscv32 -mattr=+m -verify-machineinstrs
urem-vector-lkk.lldont_fold_urem_i16_smax-mtriple=riscv32 -verify-machineinstrs
urem-vector-lkk.lldont_fold_urem_i16_smax-mtriple=riscv64 -mattr=+m -verify-machineinstrs
urem-vector-lkk.lldont_fold_urem_i16_smax-mtriple=riscv64 -verify-machineinstrs
urem-vector-lkk.1cbd95fbce.ll (mutant of urem-vector-lkk.ll)dont_fold_urem_i16_smax-mtriple=riscv64 -verify-machineinstrs
urem-vector-lkk.20b317ae69.ll (mutant of urem-vector-lkk.ll)dont_fold_urem_i16_smax-mtriple=riscv32 -verify-machineinstrs
urem-vector-lkk.38b0518b83.ll (mutant of urem-vector-lkk.ll)dont_fold_urem_i16_smax-mtriple=riscv32 -mattr=+m -verify-machineinstrs
urem-vector-lkk.4c170cb920.ll (mutant of urem-vector-lkk.ll)dont_fold_urem_i16_smax-mtriple=riscv64 -verify-machineinstrs
urem-vector-lkk.8c140ec3a1.ll (mutant of urem-vector-lkk.ll)dont_fold_urem_i16_smax-mtriple=riscv32 -mattr=+m -verify-machineinstrs
urem-vector-lkk.91cf3126c4.ll (mutant of urem-vector-lkk.ll)dont_fold_urem_i16_smax-mtriple=riscv64 -mattr=+m -verify-machineinstrs
urem-vector-lkk.d45977884a.ll (mutant of urem-vector-lkk.ll)dont_fold_urem_i16_smax-mtriple=riscv64 -mattr=+m -verify-machineinstrs
urem-vector-lkk.f72d6f8a59.ll (mutant of urem-vector-lkk.ll)dont_fold_urem_i16_smax-mtriple=riscv32 -verify-machineinstrs

Generated 2026-10-15 08:05 UTC.