fallback: legalize: G_INSERT_SUBVECTOR <8 x s8>,<4 x s8>
| Run: | main-04ca53e65f-20261014-105623 |
| Kind: | fallback |
| Category: | legalize: G_INSERT_SUBVECTOR <8 x s8>,<4 x s8> |
| Occurrences: | 2 in 1 configs, 1 test files |
| Snippet from: | rvp-insert-subvector.ll @insert_zero_v4i8 via llvm-extract |
| Config: | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| Local check: | reproduces at 04ca53e65f |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
define <8 x i8> @insert_zero_v4i8(<4 x i8> %v) {
%r = call <8 x i8> @llvm.vector.insert.v8i8.v4i8(<8 x i8> zeroinitializer, <4 x i8> %v, i64 0)
ret <8 x i8> %r
}
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <8 x i8> @llvm.vector.insert.v8i8.v4i8(<8 x i8>, <4 x i8>, i64 immarg) #0
attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
Reproduce:
llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %3:_(<8 x s8>) = G_INSERT_SUBVECTOR %4:_, %0:_(<4 x s8>), 0 (in function: insert_zero_v4i8)
warning: Instruction selection used fallback path for insert_zero_v4i8
Occurrences (2):
| Input | Function | Config |
|---|
| rvp-insert-subvector.ll | insert_zero_v4i8 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-insert-subvector.c8f62ce529.ll (mutant of rvp-insert-subvector.ll) | insert_zero_v4i8 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.