fallback: translate: call llvm.experimental.constrained.fptrunc.f32.f64

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	translate: call llvm.experimental.constrained.fptrunc.f32.f64
Occurrences:	12 in 6 configs, 1 test files
Snippet from:	double-convert-strict.ll @fcvt_s_d via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define float @fcvt_s_d(double %a) #0 {
  %1 = call float @llvm.experimental.constrained.fptrunc.f32.f64(double %a, metadata !"round.dynamic", metadata !"fpexcept.strict")
  ret float %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare float @llvm.experimental.constrained.fptrunc.f32.f64(double, 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 -disable-strictnode-mutation -target-abi=ilp32d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: call llvm.experimental.constrained.fptrunc.f32.f64: '  %1 = call float @llvm.experimental.constrained.fptrunc.f32.f64(double %a, metadata !"round.dynamic", metadata !"fpexcept.strict")' (in function: fcvt_s_d)
warning: Instruction selection used fallback path for fcvt_s_d

Occurrences (12):

Input	Function	Config
double-convert-strict.ll	fcvt_s_d	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
double-convert-strict.ll	fcvt_s_d	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-convert-strict.ll	fcvt_s_d	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-convert-strict.ll	fcvt_s_d	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`
double-convert-strict.ll	fcvt_s_d	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-convert-strict.ll	fcvt_s_d	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
double-convert-strict.4c00df2813.ll (mutant of double-convert-strict.ll)	fcvt_s_d	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
double-convert-strict.4ee89220cf.ll (mutant of double-convert-strict.ll)	fcvt_s_d	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-convert-strict.512e76b5f7.ll (mutant of double-convert-strict.ll)	fcvt_s_d	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-convert-strict.7ee70dc59e.ll (mutant of double-convert-strict.ll)	fcvt_s_d	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
double-convert-strict.c88aec8138.ll (mutant of double-convert-strict.ll)	fcvt_s_d	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-convert-strict.cb04fc72ac.ll (mutant of double-convert-strict.ll)	fcvt_s_d	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`

Generated 2026-10-15 08:05 UTC.