fallback: legalize: G_INTRINSIC s64

Snippet:

; Function Attrs: nounwind
define i64 @aes64es(i64 %a, i64 %b) #0 {
  %val = call i64 @llvm.riscv.aes64es(i64 %a, i64 %b)
  ret i64 %val
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.riscv.aes64es(i64, i64) #1

attributes #0 = { nounwind }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

Reproduce:

llc -mtriple=riscv64 -mattr=+zkne -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+zkne -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(s64) = G_INTRINSIC intrinsic(@llvm.riscv.aes64es), %0:_(s64), %1:_(s64) (in function: aes64es)
warning: Instruction selection used fallback path for aes64es

Occurrences (87) (first 50):

Generated 2026-10-15 08:05 UTC.