fallback: translate: call llvm.experimental.constrained.sitofp.f64.i128

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	translate: call llvm.experimental.constrained.sitofp.f64.i128
Occurrences:	12 in 3 configs, 1 test files
Snippet from:	rv64-double-convert-strict.ll @sitofp_i128_to_f64 via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -disable-strictnode-mutation`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define double @sitofp_i128_to_f64(i128 %a) #0 {
  %1 = call double @llvm.experimental.constrained.sitofp.f64.i128(i128 %a, metadata !"round.dynamic", metadata !"fpexcept.strict")
  ret double %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare double @llvm.experimental.constrained.sitofp.f64.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=+d -verify-machineinstrs -target-abi=lp64d -disable-strictnode-mutation -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -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.f64.i128: '  %1 = call double @llvm.experimental.constrained.sitofp.f64.i128(i128 %a, metadata !"round.dynamic", metadata !"fpexcept.strict")' (in function: sitofp_i128_to_f64)
warning: Instruction selection used fallback path for sitofp_i128_to_f64

Occurrences (12):

Input	Function	Config
rv64-double-convert-strict.ll	sitofp_i128_to_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -disable-strictnode-mutation`
rv64-double-convert-strict.ll	sitofp_i128_to_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64 -disable-strictnode-mutation`
rv64-double-convert-strict.ll	sitofp_i128_to_f64	`-mtriple=riscv64 -verify-machineinstrs -target-abi=lp64 -disable-strictnode-mutation`
rv64-double-convert-strict.31f23f36c1.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -verify-machineinstrs -target-abi=lp64 -disable-strictnode-mutation`
rv64-double-convert-strict.484063e2df.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -verify-machineinstrs -target-abi=lp64 -disable-strictnode-mutation`
rv64-double-convert-strict.553b1b5785.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -disable-strictnode-mutation`
rv64-double-convert-strict.5f01a278d3.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -verify-machineinstrs -target-abi=lp64 -disable-strictnode-mutation`
rv64-double-convert-strict.708ab81542.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64 -disable-strictnode-mutation`
rv64-double-convert-strict.7f2e595975.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -disable-strictnode-mutation`
rv64-double-convert-strict.bbf043a34c.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64 -disable-strictnode-mutation`
rv64-double-convert-strict.ea129f505c.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -disable-strictnode-mutation`
rv64-double-convert-strict.ec5664ca4b.ll (mutant of rv64-double-convert-strict.ll)	sitofp_i128_to_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64 -disable-strictnode-mutation`

Generated 2026-10-15 08:05 UTC.