fallback: legalize: G_SMULH s32
| Run: | main-04ca53e65f-20261014-105623 |
| Kind: | fallback |
| Category: | legalize: G_SMULH s32 |
| Occurrences: | 1 in 1 configs, 1 test files |
| Snippet from: | smulh.ll @smulh_i32 via llvm-extract |
| Config: | -mtriple=riscv64 |
| Local check: | reproduces at 04ca53e65f |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
; Function Attrs: nounwind
define i32 @smulh_i32(i32 %x, i32 %y) #0 {
%r = call i32 @llvm.smulh.i32(i32 %x, i32 %y)
ret i32 %r
}
; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smulh.i32(i32, i32) #1
attributes #0 = { nounwind }
attributes #1 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }
Reproduce:
llc -mtriple=riscv64 -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %4:_(s32) = G_SMULH %0:_, %1:_ (in function: smulh_i32)
warning: Instruction selection used fallback path for smulh_i32
Occurrences (1):
| Input | Function | Config |
|---|
| smulh.ll | smulh_i32 | -mtriple=riscv64 |
Generated 2026-10-15 08:05 UTC.