fallback: translate: call llvm.experimental.constrained.fptrunc.f16.f128

Run:explore-bc8218b282-20261015-075519
Kind:fallback
Category:translate: call llvm.experimental.constrained.fptrunc.f16.f128
Occurrences:34 in 17 configs, 1 test files
Snippet from:half-convert-strict.ll @fcvt_h_q via llvm-extract
Config:-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
Local check:reproduces at bc8218b282
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define half @fcvt_h_q(fp128 %a) #0 {
  %1 = call half @llvm.experimental.constrained.fptrunc.f16.f128(fp128 %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.fptrunc.f16.f128(fp128, metadata, metadata) #1

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

Reproduce:

llc -mtriple=riscv32 -mattr=+d -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 -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: call llvm.experimental.constrained.fptrunc.f16.f128: '  %1 = call half @llvm.experimental.constrained.fptrunc.f16.f128(fp128 %a, metadata !"round.dynamic", metadata !"fpexcept.strict")' (in function: fcvt_h_q)
warning: Instruction selection used fallback path for fcvt_h_q

Occurrences (34):

InputFunctionConfig
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+d,+zfh -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+zdinx,+zhinx -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv64 -mattr=+d,+zfh -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv64 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv64 -mattr=+zdinx,+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv64 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.llfcvt_h_q-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.66cf2d20f6.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.685177db3b.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+zdinx,+zhinx -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.793d7c07ac.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation
half-convert-strict.7c6d7b4de1.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv64 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation
half-convert-strict.7cbe9a5cd7.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.83660d48b0.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.84ec7fe457.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.8eb4ee54b9.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv64 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.925d471d2d.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.981fadeb0e.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.9c00b14d53.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv64 -mattr=+d,+zfh -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation
half-convert-strict.b0abd30ef2.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation
half-convert-strict.cba94ec3db.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation
half-convert-strict.cbdc4c3f7d.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv64 -mattr=+zdinx,+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.ce0ae008be.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.d35d632425.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv32 -mattr=+d,+zfh -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.e97d1e67c6.ll (mutant of half-convert-strict.ll)fcvt_h_q-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation

Generated 2026-10-15 08:05 UTC.