fallback: translate: call llvm.experimental.constrained.fptosi.i32.f32

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	translate: call llvm.experimental.constrained.fptosi.i32.f32
Occurrences:	24 in 9 configs, 3 test files
Snippet from:	float-convert-strict.ll @fcvt_w_s 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 i32 @fcvt_w_s(float %a) #0 {
  %1 = call i32 @llvm.experimental.constrained.fptosi.i32.f32(float %a, metadata !"fpexcept.strict")
  ret i32 %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare i32 @llvm.experimental.constrained.fptosi.i32.f32(float, 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.fptosi.i32.f32: '  %1 = call i32 @llvm.experimental.constrained.fptosi.i32.f32(float %a, metadata !"fpexcept.strict")' (in function: fcvt_w_s)
warning: Instruction selection used fallback path for fcvt_w_s

Occurrences (24):

Input	Function	Config
float-convert-strict.ll	fcvt_w_s	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f`
float-convert-strict.ll	fcvt_w_s	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
float-convert-strict.ll	fcvt_w_s	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
float-convert-strict.ll	fcvt_w_s	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64f`
float-convert-strict.ll	fcvt_w_s	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
float-convert-strict.ll	fcvt_w_s	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.ll	aext_fptosi	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.ll	sext_fptosi	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.ll	zext_fptosi	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.ll	aext_fptosi	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.ll	sext_fptosi	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.ll	zext_fptosi	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64i-single-softfloat.ll	strict_fp32_to_si32	`-mtriple=riscv64 -verify-machineinstrs`
rv64f-float-convert-strict.9289b3a1d8.ll (mutant of rv64f-float-convert-strict.ll)	zext_fptosi	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.b9da8d4a51.ll (mutant of rv64f-float-convert-strict.ll)	zext_fptosi	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.ba6524f7c8.ll (mutant of rv64f-float-convert-strict.ll)	sext_fptosi	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.ba6524f7c8.ll (mutant of rv64f-float-convert-strict.ll)	zext_fptosi	`-mtriple=riscv64 -mattr=+f -target-abi=lp64f -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.e2ee9be0c9.ll (mutant of rv64f-float-convert-strict.ll)	sext_fptosi	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64f-float-convert-strict.e2ee9be0c9.ll (mutant of rv64f-float-convert-strict.ll)	zext_fptosi	`-mtriple=riscv64 -mattr=+zfinx -target-abi=lp64 -verify-machineinstrs -disable-strictnode-mutation`
rv64i-single-softfloat.368a4caf29.ll (mutant of rv64i-single-softfloat.ll)	strict_fp32_to_si32	`-mtriple=riscv64 -verify-machineinstrs`
rv64i-single-softfloat.5399fa0e16.ll (mutant of rv64i-single-softfloat.ll)	strict_fp32_to_si32	`-mtriple=riscv64 -verify-machineinstrs`
rv64i-single-softfloat.5b8b40e6d9.ll (mutant of rv64i-single-softfloat.ll)	strict_fp32_to_si32	`-mtriple=riscv64 -verify-machineinstrs`
rv64i-single-softfloat.a92af1a591.ll (mutant of rv64i-single-softfloat.ll)	strict_fp32_to_si32	`-mtriple=riscv64 -verify-machineinstrs`
rv64i-single-softfloat.bcd721441e.ll (mutant of rv64i-single-softfloat.ll)	strict_fp32_to_si32	`-mtriple=riscv64 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.