fallback: translate: fsub bfloat

Run:explore-04ca53e65f-20261014-114124
Kind:fallback
Category:translate: fsub bfloat NEW
Occurrences:33 in 28 configs, 9 test files
Snippet from:short-forward-branch-opt-with-branch-with-immediates_32_uge.2e1c639614.ll (mutant of short-forward-branch-opt-with-branch-with-immediates_32_uge.ll) @branch_with_uimmSFB_mv via llvm-extract + llvm-reduce
Config:-verify-machineinstrs -mtriple=riscv32
Local check:reproduces at 04ca53e65f
Compiler Explorer:https://godbolt.org/z/1K8EWbh9M (llc-assertions-trunk, checked 2026-10-14 11:49 UTC): G reproduces

Snippet:

define bfloat @branch_with_uimmSFB_mv() {
entry:
  %B = fsub bfloat 0.000000e+00, 0.000000e+00
  ret bfloat %B
}

Compiler Explorer panes:

PaneOptionsExitInstsstderr
GlobalISel-verify-machineinstrs -mtriple=riscv32 -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*02remark: <unknown>:0:0: unable to translate instruction: fsub: ' %B = fsub bfloat 0.000000e+00, 0.000000e+00' (in function: branch_with_uimmSFB_mv)
warning: Instruction selection used fallback path for branch_with_uimmSFB_mv
SelectionDAG (control)-verify-machineinstrs -mtriple=riscv32 -global-isel=002-

Reproduce:

llc -verify-machineinstrs -mtriple=riscv32 -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -verify-machineinstrs -mtriple=riscv32 -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: fsub: '  %B = fsub bfloat 0.000000e+00, 0.000000e+00' (in function: branch_with_uimmSFB_mv)
warning: Instruction selection used fallback path for branch_with_uimmSFB_mv

Occurrences (33):

InputFunctionConfig
bfloat-mem.13d73636ff.ll (mutant of bfloat-mem.ll)flh-mtriple=riscv32 -mattr=+zfbfmin -verify-machineinstrs -target-abi ilp32f
bfloat-mem.29c84ffccd.ll (mutant of bfloat-mem.ll)flh-mtriple=riscv64 -mattr=+zfbfmin -verify-machineinstrs -target-abi lp64f
double-convert.12dcf9927e.ll (mutant of double-convert.ll)fcvt_w_d_sat_sext-mtriple=riscv64 -verify-machineinstrs
double-convert.24c8d53d98.ll (mutant of double-convert.ll)fcvt_w_d_sat_sext-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
double-convert.ae941ef2d5.ll (mutant of double-convert.ll)fcvt_w_d_sat_sext-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32
double-convert.f192e4a60e.ll (mutant of double-convert.ll)fcvt_w_d_sat_sext-mtriple=riscv32 -verify-machineinstrs
double-convert.f4f8b8cb31.ll (mutant of double-convert.ll)fcvt_w_d_sat_sext-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d
double-convert.fb47a97595.ll (mutant of double-convert.ll)fcvt_w_d_sat_sext-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64
double-intrinsics-strict.96945ed6df.ll (mutant of double-intrinsics-strict.ll)ldexp_f64-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d
double-intrinsics-strict.96b9b42851.ll (mutant of double-intrinsics-strict.ll)ldexp_f64-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64
double-intrinsics-strict.a6e381d50f.ll (mutant of double-intrinsics-strict.ll)ldexp_f64-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation
double-intrinsics-strict.b2e395c6d6.ll (mutant of double-intrinsics-strict.ll)ldexp_f64-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32
double-intrinsics-strict.ecaabc05af.ll (mutant of double-intrinsics-strict.ll)ldexp_f64-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d
double-intrinsics-strict.eccd202bc0.ll (mutant of double-intrinsics-strict.ll)ldexp_f64-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation
float-intrinsics-strict.10a105c63a.ll (mutant of float-intrinsics-strict.ll)ldexp_f32-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation
float-intrinsics-strict.247c2e4f2b.ll (mutant of float-intrinsics-strict.ll)ldexp_f32-mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f
float-intrinsics-strict.a8910ea7a3.ll (mutant of float-intrinsics-strict.ll)ldexp_f32-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation
float-intrinsics-strict.c26a608044.ll (mutant of float-intrinsics-strict.ll)ldexp_f32-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32
float-intrinsics-strict.d605b61ba7.ll (mutant of float-intrinsics-strict.ll)ldexp_f32-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64
float-intrinsics-strict.e7996184c5.ll (mutant of float-intrinsics-strict.ll)ldexp_f32-mtriple=riscv64 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64f
qc-access-marking.a0bc6cbee0.ll (mutant of qc-access-marking.ll)store_word_self-mtriple=riscv32 -mattr=+xqcili,+relax,+zca,+zcb -code-model=small -verify-machineinstrs
qc-access-marking.b94f30062e.ll (mutant of qc-access-marking.ll)store_word_self-mtriple=riscv32 -mattr=+xqcili,+relax -code-model=small -verify-machineinstrs
rv64zba.0dc63dce85.ll (mutant of rv64zba.ll)sh3add-mtriple=riscv64 -mattr=+m,+zba -verify-machineinstrs
rv64zba.5058607afd.ll (mutant of rv64zba.ll)sh3add-mtriple=riscv64 -mattr=+m -verify-machineinstrs
rv64zba.8f9f47427e.ll (mutant of rv64zba.ll)sh3add-mtriple=riscv64 -mattr=+m,+zba,+zbb,+zbs -verify-machineinstrs
rv64zba.a024a6683d.ll (mutant of rv64zba.ll)sh3add-mtriple=riscv64 -mattr=+m,+zba,+zbb -verify-machineinstrs
rv64zba.de0203a95e.ll (mutant of rv64zba.ll)sh3add-mtriple=riscv64 -mattr=+m,+xandesperf -verify-machineinstrs
rv64zbkb.358c0c58fa.ll (mutant of rv64zbkb.ll)srli_pack-mtriple=riscv64 -mattr=+m -verify-machineinstrs
rv64zbkb.997434018b.ll (mutant of rv64zbkb.ll)srli_pack-mtriple=riscv64 -mattr=+m,+zbkb -verify-machineinstrs
short-forward-branch-opt-with-branch-with-immediates_32_uge.2e1c639614.ll (mutant of short-forward-branch-opt-with-branch-with-immediates_32_uge.ll)branch_with_uimmSFB_mv-verify-machineinstrs -mtriple=riscv32
short-forward-branch-opt-with-branch-with-immediates_32_uge.b3e13f9cbd.ll (mutant of short-forward-branch-opt-with-branch-with-immediates_32_uge.ll)branch_with_uimmSFB_mv-verify-machineinstrs -mtriple=riscv32 -mattr=+xqci,+short-forward-branch-ialu,+short-forward-branch-imul,+short-forward-branch-iload,+m
short-forward-branch-opt-with-branch-with-immediates_32_ult.5dbd1a13c5.ll (mutant of short-forward-branch-opt-with-branch-with-immediates_32_ult.ll)branch_with_uimmSFB_mv-verify-machineinstrs -mtriple=riscv32
short-forward-branch-opt-with-branch-with-immediates_32_ult.ff22d1712d.ll (mutant of short-forward-branch-opt-with-branch-with-immediates_32_ult.ll)branch_with_uimmSFB_mv-verify-machineinstrs -mtriple=riscv32 -mattr=+xqci,+short-forward-branch-ialu,+short-forward-branch-imul,+short-forward-branch-iload,+m

Generated 2026-10-15 08:05 UTC.