fallback: select: G_JUMP_TABLE p0

Snippet:

; Function Attrs: nounwind
define void @jt(i32 signext %in, ptr %out) #0 {
entry:
  switch i32 %in, label %exit [
    i32 1, label %bb1
    i32 2, label %bb2
    i32 3, label %bb3
    i32 4, label %bb4
    i32 5, label %bb5
    i32 6, label %bb6
  ]

bb1:                                              ; preds = %entry
  store i32 4, ptr %out, align 4
  br label %exit

bb2:                                              ; preds = %entry
  store i32 3, ptr %out, align 4
  br label %exit

bb3:                                              ; preds = %entry
  store i32 2, ptr %out, align 4
  br label %exit

bb4:                                              ; preds = %entry
  store i32 1, ptr %out, align 4
  br label %exit

bb5:                                              ; preds = %entry
  store i32 100, ptr %out, align 4
  br label %exit

bb6:                                              ; preds = %entry
  store i32 200, ptr %out, align 4
  br label %exit

exit:                                             ; preds = %bb6, %bb5, %bb4, %bb3, %bb2, %bb1, %entry
  ret void
}

attributes #0 = { nounwind }

Reproduce:

llc -mtriple=riscv64 -code-model=large -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -code-model=large -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: cannot select: %10:gprb(p0) = G_JUMP_TABLE %jump-table.0 (in function: jt)
warning: Instruction selection used fallback path for jt

Occurrences (11):

Generated 2026-10-15 08:05 UTC.