fallback: translate: call llvm.experimental.constrained.lround.i64.f16

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	translate: call llvm.experimental.constrained.lround.i64.f16
Occurrences:	16 in 8 configs, 2 test files
Snippet from:	zfh-half-intrinsics-strict.ll @lround_f16 via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define i64 @lround_f16(half %a) #0 {
  %1 = call i64 @llvm.experimental.constrained.lround.i64.f16(half %a, metadata !"fpexcept.strict") #2
  ret i64 %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare i64 @llvm.experimental.constrained.lround.i64.f16(half, metadata) #1

attributes #0 = { nounwind strictfp }
attributes #1 = { nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite) }
attributes #2 = { strictfp }

Reproduce:

llc -mtriple=riscv64 -mattr=+d -mattr=+zfh -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 -mattr=+zfh -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.lround.i64.f16: '  %1 = call i64 @llvm.experimental.constrained.lround.i64.f16(half %a, metadata !"fpexcept.strict") #2' (in function: lround_f16)
warning: Instruction selection used fallback path for lround_f16

Occurrences (16):

Input	Function	Config
zfh-half-intrinsics-strict.ll	lround_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation`
zfh-half-intrinsics-strict.ll	lround_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
zfh-half-intrinsics-strict.ll	lround_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
zfh-half-intrinsics-strict.ll	lround_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
zfhmin-half-intrinsics-strict.ll	lround_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation`
zfhmin-half-intrinsics-strict.ll	lround_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
zfhmin-half-intrinsics-strict.ll	lround_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
zfhmin-half-intrinsics-strict.ll	lround_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
zfh-half-intrinsics-strict.0329fe3687.ll (mutant of zfh-half-intrinsics-strict.ll)	lround_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
zfh-half-intrinsics-strict.248180cc08.ll (mutant of zfh-half-intrinsics-strict.ll)	lround_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
zfh-half-intrinsics-strict.2dc26de988.ll (mutant of zfh-half-intrinsics-strict.ll)	lround_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation`
zfh-half-intrinsics-strict.96d8698465.ll (mutant of zfh-half-intrinsics-strict.ll)	lround_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
zfhmin-half-intrinsics-strict.0cf2931b92.ll (mutant of zfhmin-half-intrinsics-strict.ll)	lround_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f -disable-strictnode-mutation`
zfhmin-half-intrinsics-strict.427f0a7c95.ll (mutant of zfhmin-half-intrinsics-strict.ll)	lround_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d -disable-strictnode-mutation`
zfhmin-half-intrinsics-strict.c4e55729fa.ll (mutant of zfhmin-half-intrinsics-strict.ll)	lround_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64 -disable-strictnode-mutation`
zfhmin-half-intrinsics-strict.ce38f50fae.ll (mutant of zfhmin-half-intrinsics-strict.ll)	lround_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`

Generated 2026-10-15 08:05 UTC.