fallback: legalize: G_ADD <16 x s8>

Run:explore-04ca53e65f-20261014-114124
Kind:fallback
Category:legalize: G_ADD <16 x s8>
Occurrences:1 in 1 configs, 1 test files
Snippet from:calling-conv-p-ext-vector.ll @test_cc_v16i8 via llvm-extract
Config:-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs
Local check:reproduces at 04ca53e65f
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

define <16 x i8> @test_cc_v16i8(<16 x i8> %a, <16 x i8> %b) {
  %res = add <16 x i8> %a, %b
  ret <16 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: %6:_(<16 x s8>) = G_ADD %0:_, %1:_ (in function: test_cc_v16i8)
warning: Instruction selection used fallback path for test_cc_v16i8

Occurrences (1):

InputFunctionConfig
calling-conv-p-ext-vector.lltest_cc_v16i8-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs

Generated 2026-10-15 08:05 UTC.