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

Run:explore-04ca53e65f-20261014-114124
Kind:fallback
Category:translate: call llvm.experimental.constrained.fpext.f128.f16
Occurrences:34 in 17 configs, 1 test files
Snippet from:half-convert-strict.ll @fcvt_q_h via llvm-extract
Config:-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
Local check:reproduces at 04ca53e65f
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define fp128 @fcvt_q_h(half %a) #0 {
  %1 = call fp128 @llvm.experimental.constrained.fpext.f128.f16(half %a, metadata !"fpexcept.strict")
  ret fp128 %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare fp128 @llvm.experimental.constrained.fpext.f128.f16(half, 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.fpext.f128.f16: '  %1 = call fp128 @llvm.experimental.constrained.fpext.f128.f16(half %a, metadata !"fpexcept.strict")' (in function: fcvt_q_h)
warning: Instruction selection used fallback path for fcvt_q_h

Occurrences (34):

InputFunctionConfig
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+d,+zfh -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+zdinx,+zhinx -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv64 -mattr=+d,+zfh -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv64 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv64 -mattr=+zdinx,+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv64 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.llfcvt_q_h-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.10142f09c8.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.28c86ca8d1.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv64 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.31b847cc32.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation
half-convert-strict.57d3e71bdc.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.5ec8a067bd.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation
half-convert-strict.7c8f625d2a.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.7d183d035b.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv64 -mattr=+d,+zfh -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation
half-convert-strict.7f55605ad7.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.84e32a733c.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+d,+zfh -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.8b7bb5402a.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d -disable-strictnode-mutation
half-convert-strict.8ba247b6c0.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv64 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation
half-convert-strict.97b3854092.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.ad8ee5e4f2.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+zdinx,+zhinx -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.be022f1db6.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv64 -mattr=+zdinx,+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation
half-convert-strict.cb8aaeb2a0.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32 -disable-strictnode-mutation
half-convert-strict.eb2411ef6f.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation
half-convert-strict.f6ce2c6e72.ll (mutant of half-convert-strict.ll)fcvt_q_h-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f -disable-strictnode-mutation

Generated 2026-10-15 08:05 UTC.