fallback: legalize: G_STRICT_FLDEXP s16,s32

Snippet:

; Function Attrs: nounwind strictfp
define half @ldexp_f16(half %x, i32 signext %y) #0 {
  %z = call half @llvm.experimental.constrained.ldexp.f16.i32(half %x, i32 %y, metadata !"round.dynamic", metadata !"fpexcept.strict") #2
  ret half %z
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare half @llvm.experimental.constrained.ldexp.f16.i32(half, i32, 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=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(s16) = G_STRICT_FLDEXP %0:_, %1:_(s32) (in function: ldexp_f16)
warning: Instruction selection used fallback path for ldexp_f16

Occurrences (32):

Generated 2026-10-15 08:05 UTC.