fallback: legalize: G_SMULH s16
| Run: | explore-bc8218b282-20261015-075519 |
| Kind: | fallback |
| Category: | legalize: G_SMULH s16 |
| Occurrences: | 8 in 5 configs, 5 test files |
| Snippet from: | div.ll @sdiv16_constant via llvm-extract |
| Config: | -mtriple=riscv64 -verify-machineinstrs |
| Local check: | reproduces at bc8218b282 |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
; Function Attrs: nounwind
define i16 @sdiv16_constant(i16 %a) #0 {
%1 = sdiv i16 %a, 5
ret i16 %1
}
attributes #0 = { nounwind }
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: %9:_(s16) = G_SMULH %0:_, %5:_ (in function: sdiv16_constant)
warning: Instruction selection used fallback path for sdiv16_constant
Occurrences (8):
| Input | Function | Config |
|---|
| div.ll | sdiv16_constant | -mtriple=riscv64 -verify-machineinstrs |
| smulh.ll | smulh_i16 | -mtriple=riscv32 |
| smulh.ll | smulh_i16 | -mtriple=riscv64 |
| branch_zero.36feb089f6.ll (mutant of branch_zero.ll) | bar | -mtriple=riscv64 -verify-machineinstrs |
| bswap-shift.25df4fcac9.ll (mutant of bswap-shift.ll) | test_bswap_shli_7_bswap_i16 | -mtriple=riscv64 -mattr=+zbkb -verify-machineinstrs |
| bswap-shift.40d2b4cd41.ll (mutant of bswap-shift.ll) | test_bswap_shli_7_bswap_i16 | -mtriple=riscv64 -mattr=+zbb -verify-machineinstrs |
| div.eba9ddca6f.ll (mutant of div.ll) | sdiv16_constant | -mtriple=riscv64 -verify-machineinstrs |
| load-setcc-combine.fbce033f05.ll (mutant of load-setcc-combine.ll) | zext_nonneg_load_i16 | -mtriple=riscv64 |
Generated 2026-10-15 08:05 UTC.