fallback: legalize: G_UDIV <4 x s32>
| Run: | main-bc8218b282-20261015-074651 |
| Kind: | fallback |
| Category: | legalize: G_UDIV <4 x s32> NEW |
| Occurrences: | 5 in 4 configs, 3 test files |
| Snippet from: | rv64zbb.5345276861.ll (mutant of rv64zbb.ll) @sub_if_uge_i16 via llvm-extract + llvm-reduce |
| Config: | -mtriple=riscv64 -verify-machineinstrs |
| Local check: | reproduces at bc8218b282 |
| Compiler Explorer: | https://godbolt.org/z/5P7fqPers (llc-assertions-trunk, checked 2026-10-14 11:04 UTC): G reproduces |
Snippet:
define <4 x i32> @sub_if_uge_i16() {
%B = udiv <4 x i32> splat (i32 1), zeroinitializer
ret <4 x i32> %B
}
Compiler Explorer panes:
| Pane | Options | Exit | Insts | stderr |
|---|
| GlobalISel | -mtriple=riscv64 -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* | 0 | 1 | remark: <unknown>:0:0: unable to legalize instruction: %5:_(<4 x s32>) = G_UDIV %1:_, %3:_ (in function: sub_if_uge_i16)
warning: Instruction selection used fallback path for sub_if_uge_i16 |
| SelectionDAG (control) | -mtriple=riscv64 -verify-machineinstrs -global-isel=0 | 0 | 1 | - |
Reproduce:
llc -mtriple=riscv64 -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -verify-machineinstrs -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %5:_(<4 x s32>) = G_UDIV %1:_, %3:_ (in function: sub_if_uge_i16)
warning: Instruction selection used fallback path for sub_if_uge_i16
Occurrences (5):
| Input | Function | Config |
|---|
| local-stack-slot-allocation.1dd5da1f74.ll (mutant of local-stack-slot-allocation.ll) | frame_pointer | -mtriple=riscv64 -verify-machineinstrs |
| local-stack-slot-allocation.8444f036e6.ll (mutant of local-stack-slot-allocation.ll) | frame_pointer | -mtriple=riscv32 -verify-machineinstrs |
| pr63365.b42c41a051.ll (mutant of pr63365.ll) | f | -mtriple=riscv32 |
| rv64zbb.5345276861.ll (mutant of rv64zbb.ll) | sub_if_uge_i16 | -mtriple=riscv64 -verify-machineinstrs |
| rv64zbb.c104f736be.ll (mutant of rv64zbb.ll) | sub_if_uge_i16 | -mtriple=riscv64 -mattr=+zbb -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.