fallback: legalize: G_FPTOSI_SAT s128,s64

Snippet:

; Function Attrs: nounwind
define i128 @fptosi_sat_f64_to_i128(double %a) #0 {
  %1 = tail call i128 @llvm.fptosi.sat.i128.f64(double %a)
  ret i128 %1
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare i128 @llvm.fptosi.sat.i128.f64(double) #1

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

Reproduce:

llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %1:_(s128) = G_FPTOSI_SAT %0:_(s64) (in function: fptosi_sat_f64_to_i128)
warning: Instruction selection used fallback path for fptosi_sat_f64_to_i128

Occurrences (3):

Generated 2026-10-15 08:05 UTC.