fallback: translate: call llvm.experimental.constrained.atan.f32

Run:explore-bc8218b282-20261015-075519
Kind:fallback
Category:translate: call llvm.experimental.constrained.atan.f32
Occurrences:12 in 6 configs, 1 test files
Snippet from:float-intrinsics-strict.ll @atan_f32 via llvm-extract
Config:-mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f
Local check:reproduces at bc8218b282
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define float @atan_f32(float %a) #0 {
  %1 = call float @llvm.experimental.constrained.atan.f32(float %a, metadata !"round.dynamic", metadata !"fpexcept.strict") #2
  ret float %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare float @llvm.experimental.constrained.atan.f32(float, metadata, metadata) #1

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

Reproduce:

llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: call llvm.experimental.constrained.atan.f32: '  %1 = call float @llvm.experimental.constrained.atan.f32(float %a, metadata !"round.dynamic", metadata !"fpexcept.strict") #2' (in function: atan_f32)
warning: Instruction selection used fallback path for atan_f32

Occurrences (12):

InputFunctionConfig
float-intrinsics-strict.llatan_f32-mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f
float-intrinsics-strict.llatan_f32-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32
float-intrinsics-strict.llatan_f32-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation
float-intrinsics-strict.llatan_f32-mtriple=riscv64 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64f
float-intrinsics-strict.llatan_f32-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64
float-intrinsics-strict.llatan_f32-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation
float-intrinsics-strict.2940d6b2ca.ll (mutant of float-intrinsics-strict.ll)atan_f32-mtriple=riscv64 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64f
float-intrinsics-strict.3499b586f2.ll (mutant of float-intrinsics-strict.ll)atan_f32-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32
float-intrinsics-strict.45c8119cc8.ll (mutant of float-intrinsics-strict.ll)atan_f32-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64
float-intrinsics-strict.911c27a2a3.ll (mutant of float-intrinsics-strict.ll)atan_f32-mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f
float-intrinsics-strict.aec171c6d4.ll (mutant of float-intrinsics-strict.ll)atan_f32-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation
float-intrinsics-strict.d252be037c.ll (mutant of float-intrinsics-strict.ll)atan_f32-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation

Generated 2026-10-15 08:05 UTC.