fallback: legalize: G_CLMUL s48
| Run: | main-04ca53e65f-20261014-105623 |
| Kind: | fallback |
| Category: | legalize: G_CLMUL s48 |
| Occurrences: | 10 in 10 configs, 1 test files |
| Snippet from: | clmul.ll @clmul_i48 via llvm-extract |
| Config: | -mtriple=riscv32 -mattr=+m -verify-machineinstrs |
| Local check: | reproduces at 04ca53e65f |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
; Function Attrs: nounwind
define i48 @clmul_i48(i48 %a, i48 %b) #0 {
%res = call i48 @llvm.clmul.i48(i48 %a, i48 %b)
ret i48 %res
}
; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare i48 @llvm.clmul.i48(i48, i48) #1
attributes #0 = { nounwind }
attributes #1 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }
Reproduce:
llc -mtriple=riscv32 -mattr=+m -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+m -verify-machineinstrs -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %8:_(s48) = G_CLMUL %0:_, %1:_ (in function: clmul_i48)
warning: Instruction selection used fallback path for clmul_i48
Occurrences (10):
| Input | Function | Config |
|---|
| clmul.ll | clmul_i48 | -mtriple=riscv32 -mattr=+m -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv32 -mattr=+m,+zbc -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv32 -mattr=+m,+zbs -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv32 -mattr=+m,+zvbc -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv32 -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv64 -mattr=+m -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv64 -mattr=+m,+zbc -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv64 -mattr=+m,+zbs -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv64 -mattr=+m,+zvbc -verify-machineinstrs |
| clmul.ll | clmul_i48 | -mtriple=riscv64 -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.