fallback: legalize: G_SHUFFLE_VECTOR <8 x s8>,<4 x s8>
| Run: | explore-bc8218b282-20261015-075519 |
| Kind: | fallback |
| Category: | legalize: G_SHUFFLE_VECTOR <8 x s8>,<4 x s8> |
| Occurrences: | 1 in 1 configs, 1 test files |
| Snippet from: | rvp-zip.ll @test_pzip_v8i8 via llvm-extract |
| Config: | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| Local check: | reproduces at bc8218b282 |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
define <8 x i8> @test_pzip_v8i8(<4 x i8> %a, <4 x i8> %b) {
%r = shufflevector <4 x i8> %a, <4 x i8> %b, <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>
ret <8 x i8> %r
}
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: %6:_(<8 x s8>) = G_SHUFFLE_VECTOR %0:_(<4 x s8>), %1:_, shufflemask(0, 4, 1, 5, 2, 6, 3, 7) (in function: test_pzip_v8i8)
warning: Instruction selection used fallback path for test_pzip_v8i8
Occurrences (1):
| Input | Function | Config |
|---|
| rvp-zip.ll | test_pzip_v8i8 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.