fallback: legalize: G_SELECT <4 x s16>,s64

Run:explore-bc8218b282-20261015-075519
Kind:fallback
Category:legalize: G_SELECT <4 x s16>,s64
Occurrences:1 in 1 configs, 1 test files
Snippet from:rvp-simd-64.ll @test_select_v4i16 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_select_v4i16(i1 %cond, <4 x i16> %a, <4 x i16> %b) {
  %res = select i1 %cond, <4 x i16> %a, <4 x i16> %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: %4:_(<4 x s16>) = G_SELECT %5:_(s64), %1:_, %2:_ (in function: test_select_v4i16)
warning: Instruction selection used fallback path for test_select_v4i16

Occurrences (1):

InputFunctionConfig
rvp-simd-64.lltest_select_v4i16-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs

Generated 2026-10-15 08:05 UTC.