fallback: legalize: G_FFREXP s16,s32

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_FFREXP s16,s32
Occurrences:	64 in 22 configs, 2 test files
Snippet from:	half-intrinsics.ll @frexp_half via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define { half, i32 } @frexp_half(half %x) #0 {
  %a = call { half, i32 } @llvm.frexp.f16.i32(half %x)
  ret { half, i32 } %a
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare { half, i32 } @llvm.frexp.f16.i32(half) #1

attributes #0 = { nounwind }
attributes #1 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }

Reproduce:

llc -mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %1:_(s16), %2:_(s32) = G_FFREXP %0:_ (in function: frexp_half)
warning: Instruction selection used fallback path for frexp_half

Occurrences (64) (first 50):

Input	Function	Config
half-intrinsics.ll	frexp_half	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	frexp_half	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	frexp_half	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	frexp_half	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	frexp_half	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.ll	frexp_half	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	frexp_half	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	frexp_half	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	frexp_half	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	frexp_half	`-mtriple=riscv64 -verify-machineinstrs`
llvm.frexp.ll	test_frexp_f16_i32	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
llvm.frexp.ll	test_frexp_f16_i32_only_use_fract	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
llvm.frexp.ll	test_frexp_f16_i32_only_use_exp	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
llvm.frexp.ll	test_frexp_f16_i32	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32`
llvm.frexp.ll	test_frexp_f16_i32_only_use_fract	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32`
llvm.frexp.ll	test_frexp_f16_i32_only_use_exp	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32`
llvm.frexp.ll	test_frexp_f16_i32	`-mtriple=riscv32 -verify-machineinstrs`
llvm.frexp.ll	test_frexp_f16_i32_only_use_fract	`-mtriple=riscv32 -verify-machineinstrs`
llvm.frexp.ll	test_frexp_f16_i32_only_use_exp	`-mtriple=riscv32 -verify-machineinstrs`
llvm.frexp.ll	test_frexp_f16_i32	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
llvm.frexp.ll	test_frexp_f16_i32_only_use_fract	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
llvm.frexp.ll	test_frexp_f16_i32_only_use_exp	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
llvm.frexp.ll	test_frexp_f16_i32	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64`
llvm.frexp.ll	test_frexp_f16_i32_only_use_fract	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64`
llvm.frexp.ll	test_frexp_f16_i32_only_use_exp	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64`
llvm.frexp.ll	test_frexp_f16_i32	`-mtriple=riscv64 -verify-machineinstrs`
llvm.frexp.ll	test_frexp_f16_i32_only_use_fract	`-mtriple=riscv64 -verify-machineinstrs`
llvm.frexp.ll	test_frexp_f16_i32_only_use_exp	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.0241c42d6f.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.035778b016.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.0bf99633c3.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.1cd92fd7ef.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.21410fa30d.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.2340a4b878.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.51ee09054d.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.5328cb6896.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.54b9476495.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d`
half-intrinsics.623bf284e7.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.90cf749217.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.bac843ed52.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.c3258c0446.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.c36aca5a80.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-intrinsics.c909bf7022.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.df6fd75e40.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.f071c39a93.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ff2410cf50.ll (mutant of half-intrinsics.ll)	frexp_half	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
llvm.frexp.0988e84a78.ll (mutant of llvm.frexp.ll)	test_frexp_f16_i32_only_use_fract	`-mtriple=riscv32 -verify-machineinstrs`
llvm.frexp.0988e84a78.ll (mutant of llvm.frexp.ll)	test_frexp_f16_i32_only_use_exp	`-mtriple=riscv32 -verify-machineinstrs`
llvm.frexp.192757b37d.ll (mutant of llvm.frexp.ll)	test_frexp_f16_i32_only_use_fract	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
llvm.frexp.192757b37d.ll (mutant of llvm.frexp.ll)	test_frexp_f16_i32_only_use_exp	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`

Generated 2026-10-15 08:05 UTC.