fallback: legalize: G_ASHR <4 x s8>
| Run: | main-04ca53e65f-20261014-113325 |
| Kind: | fallback |
| Category: | legalize: G_ASHR <4 x s8> |
| Occurrences: | 2 in 1 configs, 1 test files |
| Snippet from: | rvp-simd-32.ll @test_psra_bs 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 <4 x i8> @test_psra_bs(<4 x i8> %a, i8 %shamt) {
%insert = insertelement <4 x i8> poison, i8 %shamt, i32 0
%b = shufflevector <4 x i8> %insert, <4 x i8> poison, <4 x i32> zeroinitializer
%res = ashr <4 x i8> %a, %b
ret <4 x i8> %res
}
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: %9:_(<4 x s8>) = G_ASHR %0:_, %8:_(<4 x s8>) (in function: test_psra_bs)
warning: Instruction selection used fallback path for test_psra_bs
Occurrences (2):
| Input | Function | Config |
|---|
| rvp-simd-32.ll | test_psra_bs | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-32.ll | test_psra_bs_mask | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.