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

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	translate: call llvm.experimental.constrained.fpext.f64.f32
Occurrences:	12 in 6 configs, 1 test files
Snippet from:	double-convert-strict.ll @fcvt_d_s via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

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

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare double @llvm.experimental.constrained.fpext.f64.f32(float, 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.fpext.f64.f32: '  %1 = call double @llvm.experimental.constrained.fpext.f64.f32(float %a, metadata !"fpexcept.strict")' (in function: fcvt_d_s)
warning: Instruction selection used fallback path for fcvt_d_s

Occurrences (12):

Input	Function	Config
double-convert-strict.ll	fcvt_d_s	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
double-convert-strict.ll	fcvt_d_s	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-convert-strict.ll	fcvt_d_s	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-convert-strict.ll	fcvt_d_s	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`
double-convert-strict.ll	fcvt_d_s	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-convert-strict.ll	fcvt_d_s	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
double-convert-strict.3c7b62f9b6.ll (mutant of double-convert-strict.ll)	fcvt_d_s	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-convert-strict.3fc71af9fb.ll (mutant of double-convert-strict.ll)	fcvt_d_s	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-convert-strict.ab5b168141.ll (mutant of double-convert-strict.ll)	fcvt_d_s	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`
double-convert-strict.c748783071.ll (mutant of double-convert-strict.ll)	fcvt_d_s	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-convert-strict.cfd3e74e91.ll (mutant of double-convert-strict.ll)	fcvt_d_s	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
double-convert-strict.dbd1073ee4.ll (mutant of double-convert-strict.ll)	fcvt_d_s	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`

Generated 2026-10-15 08:05 UTC.