fallback: legalize: G_FFREXP s16,s32

Run:explore-04ca53e65f-20261014-114124
Kind:fallback
Category:legalize: G_FFREXP s16,s32
Occurrences:40 in 14 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 04ca53e65f
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 (40):

InputFunctionConfig
half-intrinsics.llfrexp_half-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d
half-intrinsics.llfrexp_half-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d
half-intrinsics.llfrexp_half-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f
half-intrinsics.llfrexp_half-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f
half-intrinsics.llfrexp_half-mtriple=riscv32 -verify-machineinstrs
half-intrinsics.llfrexp_half-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d
half-intrinsics.llfrexp_half-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d
half-intrinsics.llfrexp_half-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f
half-intrinsics.llfrexp_half-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f
half-intrinsics.llfrexp_half-mtriple=riscv64 -verify-machineinstrs
llvm.frexp.lltest_frexp_f16_i32-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d
llvm.frexp.lltest_frexp_f16_i32_only_use_fract-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d
llvm.frexp.lltest_frexp_f16_i32_only_use_exp-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d
llvm.frexp.lltest_frexp_f16_i32-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32
llvm.frexp.lltest_frexp_f16_i32_only_use_fract-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32
llvm.frexp.lltest_frexp_f16_i32_only_use_exp-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32
llvm.frexp.lltest_frexp_f16_i32-mtriple=riscv32 -verify-machineinstrs
llvm.frexp.lltest_frexp_f16_i32_only_use_fract-mtriple=riscv32 -verify-machineinstrs
llvm.frexp.lltest_frexp_f16_i32_only_use_exp-mtriple=riscv32 -verify-machineinstrs
llvm.frexp.lltest_frexp_f16_i32-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
llvm.frexp.lltest_frexp_f16_i32_only_use_fract-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
llvm.frexp.lltest_frexp_f16_i32_only_use_exp-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
llvm.frexp.lltest_frexp_f16_i32-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64
llvm.frexp.lltest_frexp_f16_i32_only_use_fract-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64
llvm.frexp.lltest_frexp_f16_i32_only_use_exp-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64
llvm.frexp.lltest_frexp_f16_i32-mtriple=riscv64 -verify-machineinstrs
llvm.frexp.lltest_frexp_f16_i32_only_use_fract-mtriple=riscv64 -verify-machineinstrs
llvm.frexp.lltest_frexp_f16_i32_only_use_exp-mtriple=riscv64 -verify-machineinstrs
llvm.frexp.1db2bb4251.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32_only_use_fract-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64
llvm.frexp.32a3782db6.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32_only_use_fract-mtriple=riscv64 -verify-machineinstrs
llvm.frexp.360a6cf6d3.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32_only_use_fract-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
llvm.frexp.522145a860.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32_only_use_fract-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32
llvm.frexp.6f7f1d7443.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
llvm.frexp.78fee646c1.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d
llvm.frexp.8ba90e7dac.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32_only_use_fract-mtriple=riscv32 -verify-machineinstrs
llvm.frexp.9f8bd5a3e7.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32-mtriple=riscv64 -verify-machineinstrs
llvm.frexp.ba0353f78c.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32_only_use_fract-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d
llvm.frexp.dc7e3584af.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32-mtriple=riscv32 -verify-machineinstrs
llvm.frexp.de4dcb5618.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32
llvm.frexp.eb513e2e83.ll (mutant of llvm.frexp.ll)test_frexp_f16_i32-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64

Generated 2026-10-15 08:05 UTC.