fallback: legalize: G_SMULH s8
| Run: | explore-bc8218b282-20261015-075519 |
| Kind: | fallback |
| Category: | legalize: G_SMULH s8 |
| Occurrences: | 6 in 4 configs, 3 test files |
| Snippet from: | div.ll @sdiv8_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 i8 @sdiv8_constant(i8 %a) #0 {
%1 = sdiv i8 %a, 5
ret i8 %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:_(s8) = G_SMULH %0:_, %5:_ (in function: sdiv8_constant)
warning: Instruction selection used fallback path for sdiv8_constant
Occurrences (6):
| Input | Function | Config |
|---|
| div.ll | sdiv8_constant | -mtriple=riscv32 -verify-machineinstrs |
| div.ll | sdiv8_constant | -mtriple=riscv64 -verify-machineinstrs |
| div.16b6c83239.ll (mutant of div.ll) | sdiv8_constant | -mtriple=riscv32 -verify-machineinstrs |
| div.eba9ddca6f.ll (mutant of div.ll) | sdiv8_constant | -mtriple=riscv64 -verify-machineinstrs |
| freeze-load-zext-copytoreg.7bae108bdd.ll (mutant of freeze-load-zext-copytoreg.ll) | freeze_i8_load_loop | -mtriple=riscv64 |
| pr65025.40ff2e1046.ll (mutant of pr65025.ll) | cmpxchg_masked_and_branch1 | -mtriple=riscv64 -mattr=+a |
Generated 2026-10-15 08:05 UTC.