fallback: translate: call llvm.experimental.constrained.fptosi.i128.f32

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	translate: call llvm.experimental.constrained.fptosi.i128.f32
Occurrences:	12 in 3 configs, 1 test files
Snippet from:	rv64-float-convert-strict.ll @fptosi_f32_to_i128 via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define i128 @fptosi_f32_to_i128(float %a) #0 {
  %1 = call i128 @llvm.experimental.constrained.fptosi.i128.f32(float %a, metadata !"fpexcept.strict")
  ret i128 %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare i128 @llvm.experimental.constrained.fptosi.i128.f32(float, metadata) #1

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

Reproduce:

llc -mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: call llvm.experimental.constrained.fptosi.i128.f32: '  %1 = call i128 @llvm.experimental.constrained.fptosi.i128.f32(float %a, metadata !"fpexcept.strict")' (in function: fptosi_f32_to_i128)
warning: Instruction selection used fallback path for fptosi_f32_to_i128

Occurrences (12):

Input	Function	Config
rv64-float-convert-strict.ll	fptosi_f32_to_i128	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.ll	fptosi_f32_to_i128	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.ll	fptosi_f32_to_i128	`-mtriple=riscv64 -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.22bf5852e0.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.44b6b9e58c.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.4af5fac96e.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.6c2894d2c6.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.96a6d6aa86.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.a7d31ec8e8.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.db87db2ea4.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.e486b59800.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64-float-convert-strict.f0123a19bf.ll (mutant of rv64-float-convert-strict.ll)	fptosi_f32_to_i128	`-mtriple=riscv64 -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`

Generated 2026-10-15 08:05 UTC.