fallback: translate: call llvm.experimental.constrained.uitofp.f32.i8

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	translate: call llvm.experimental.constrained.uitofp.f32.i8
Occurrences:	12 in 6 configs, 1 test files
Snippet from:	float-convert-strict.ll @fcvt_s_wu_i8 via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define float @fcvt_s_wu_i8(i8 zeroext %a) #0 {
  %1 = call float @llvm.experimental.constrained.uitofp.f32.i8(i8 %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.uitofp.f32.i8(i8, metadata, metadata) #1

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

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.uitofp.f32.i8: '  %1 = call float @llvm.experimental.constrained.uitofp.f32.i8(i8 %a, metadata !"round.dynamic", metadata !"fpexcept.strict")' (in function: fcvt_s_wu_i8)
warning: Instruction selection used fallback path for fcvt_s_wu_i8

Occurrences (12):

Input	Function	Config
float-convert-strict.ll	fcvt_s_wu_i8	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f`
float-convert-strict.ll	fcvt_s_wu_i8	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
float-convert-strict.ll	fcvt_s_wu_i8	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
float-convert-strict.ll	fcvt_s_wu_i8	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64f`
float-convert-strict.ll	fcvt_s_wu_i8	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
float-convert-strict.ll	fcvt_s_wu_i8	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
float-convert-strict.5beb37d31e.ll (mutant of float-convert-strict.ll)	fcvt_s_wu_i8	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
float-convert-strict.5f1ea2957d.ll (mutant of float-convert-strict.ll)	fcvt_s_wu_i8	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
float-convert-strict.6bd27c22ee.ll (mutant of float-convert-strict.ll)	fcvt_s_wu_i8	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
float-convert-strict.b7e08a4b6d.ll (mutant of float-convert-strict.ll)	fcvt_s_wu_i8	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f`
float-convert-strict.da0f7be7c8.ll (mutant of float-convert-strict.ll)	fcvt_s_wu_i8	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
float-convert-strict.eac793d6cf.ll (mutant of float-convert-strict.ll)	fcvt_s_wu_i8	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64f`

Generated 2026-10-15 08:05 UTC.