fallback: legalize: G_UMULH s16
| Run: | explore-bc8218b282-20261015-075519 |
| Kind: | fallback |
| Category: | legalize: G_UMULH s16 |
| Occurrences: | 4 in 4 configs, 2 test files |
| Snippet from: | div.ll @udiv16_constant via llvm-extract |
| Config: | -mtriple=riscv32 -verify-machineinstrs |
| Local check: | reproduces at bc8218b282 |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
; Function Attrs: nounwind
define i16 @udiv16_constant(i16 %a) #0 {
%1 = udiv i16 %a, 5
ret i16 %1
}
attributes #0 = { nounwind }
Reproduce:
llc -mtriple=riscv32 -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -verify-machineinstrs -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %9:_(s16) = G_UMULH %0:_, %6:_ (in function: udiv16_constant)
warning: Instruction selection used fallback path for udiv16_constant
Occurrences (4):
| Input | Function | Config |
|---|
| div.ll | udiv16_constant | -mtriple=riscv32 -verify-machineinstrs |
| div.ll | udiv16_constant | -mtriple=riscv64 -verify-machineinstrs |
| umulh.ll | umulh_i16 | -mtriple=riscv32 |
| umulh.ll | umulh_i16 | -mtriple=riscv64 |
Generated 2026-10-15 08:05 UTC.