fallback: translate: call llvm.experimental.constrained.sitofp.f16.i128

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	translate: call llvm.experimental.constrained.sitofp.f16.i128
Occurrences:	12 in 3 configs, 1 test files
Snippet from:	rv64-half-convert-strict.ll @sitofp_i128_to_f16 via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define half @sitofp_i128_to_f16(i128 %a) #0 {
  %1 = call half @llvm.experimental.constrained.sitofp.f16.i128(i128 %a, metadata !"round.dynamic", metadata !"fpexcept.strict")
  ret half %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare half @llvm.experimental.constrained.sitofp.f16.i128(i128, metadata, metadata) #1

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

Reproduce:

llc -mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: call llvm.experimental.constrained.sitofp.f16.i128: '  %1 = call half @llvm.experimental.constrained.sitofp.f16.i128(i128 %a, metadata !"round.dynamic", metadata !"fpexcept.strict")' (in function: sitofp_i128_to_f16)
warning: Instruction selection used fallback path for sitofp_i128_to_f16

Occurrences (12):

Input	Function	Config
rv64-half-convert-strict.ll	sitofp_i128_to_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
rv64-half-convert-strict.ll	sitofp_i128_to_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
rv64-half-convert-strict.ll	sitofp_i128_to_f16	`-mtriple=riscv64 -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
rv64-half-convert-strict.02d1fe2eee.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
rv64-half-convert-strict.270fc8ce32.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
rv64-half-convert-strict.59840bd0df.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
rv64-half-convert-strict.6848841674.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
rv64-half-convert-strict.7e32b1d500.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
rv64-half-convert-strict.7f4b8e5fdc.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
rv64-half-convert-strict.b0e20ea11a.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
rv64-half-convert-strict.b60a856d12.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
rv64-half-convert-strict.d1339208d6.ll (mutant of rv64-half-convert-strict.ll)	sitofp_i128_to_f16	`-mtriple=riscv64 -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`

Generated 2026-10-15 08:05 UTC.