fallback: legalize: G_MUL <8 x s8>

Run:main-bc8218b282-20261015-074651
Kind:fallback
Category:legalize: G_MUL <8 x s8>
Occurrences:16 in 15 configs, 3 test files
Snippet from:rvp-simd-64.ll @test_pmul_b 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 <8 x i8> @test_pmul_b(<8 x i8> %a, <8 x i8> %b) {
  %res = mul <8 x i8> %a, %b
  ret <8 x i8> %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:_(<8 x s8>) = G_MUL %0:_, %1:_ (in function: test_pmul_b)
warning: Instruction selection used fallback path for test_pmul_b

Occurrences (16):

InputFunctionConfig
rvp-simd-64.lltest_pmul_b-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs
atomic-cmpxchg.0cbdf21fee.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv64 -mattr=+a -verify-machineinstrs
atomic-cmpxchg.0fe8d8fb8a.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv32 -mattr=+a,+ztso,+zacas -verify-machineinstrs
atomic-cmpxchg.125439f300.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv64 -mattr=+a,+zacas,+zabha -verify-machineinstrs
atomic-cmpxchg.1a046975e2.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv32 -verify-machineinstrs
atomic-cmpxchg.1a4a74b515.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv32 -mattr=+a,+ztso -verify-machineinstrs
atomic-cmpxchg.1e2ba5fe94.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv64 -verify-machineinstrs
atomic-cmpxchg.652b25f0d3.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv32 -mattr=+a,+zacas -verify-machineinstrs
atomic-cmpxchg.737beaaf6f.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv64 -mattr=+a,+zacas -verify-machineinstrs
atomic-cmpxchg.7f68f4e12a.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv64 -mattr=+a,+ztso,+zacas,+zabha -verify-machineinstrs
atomic-cmpxchg.a3a23c30de.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv64 -mattr=+a,+ztso,+zacas -verify-machineinstrs
atomic-cmpxchg.ac47bc6a16.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv64 -mattr=+a,+ztso -verify-machineinstrs
atomic-cmpxchg.bedc3e3c9b.ll (mutant of atomic-cmpxchg.ll)cmpxchg_i16_acquire_acquire-mtriple=riscv32 -mattr=+a -verify-machineinstrs
rv64xtheadbb.04581f84fa.ll (mutant of rv64xtheadbb.ll)sexti1_i32_2-mtriple=riscv64 -mattr=+xtheadbb -verify-machineinstrs
rv64xtheadbb.2ca36bd29a.ll (mutant of rv64xtheadbb.ll)sexti1_i32_2-mtriple=riscv64 -verify-machineinstrs
rv64xtheadbb.59878c03ad.ll (mutant of rv64xtheadbb.ll)sexti1_i32_2-mtriple=riscv64 -mattr=+xtheadbb,+b -verify-machineinstrs

Generated 2026-10-15 08:05 UTC.