fallback: legalize: G_STRICT_FCMP s1,s16

Snippet:

; Function Attrs: nounwind strictfp
define i32 @fcmp_oeq(half %a, half %b) #0 {
  %1 = call i1 @llvm.experimental.constrained.fcmp.f16(half %a, half %b, metadata !"oeq", metadata !"fpexcept.strict") #2
  %2 = zext i1 %1 to i32
  ret i32 %2
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare i1 @llvm.experimental.constrained.fcmp.f16(half, half, metadata, metadata) #1

attributes #0 = { nounwind strictfp }
attributes #1 = { nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite) }
attributes #2 = { strictfp }

Reproduce:

llc -mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(s1) = G_STRICT_FCMP floatpred(oeq), %0:_(s16), %1:_ (in function: fcmp_oeq)
warning: Instruction selection used fallback path for fcmp_oeq

Occurrences (126) (first 50):

Generated 2026-10-15 08:05 UTC.