fallback: legalize: G_SHL <4 x s8>
| Run: | explore-04ca53e65f-20261014-114124 |
| Kind: | fallback |
| Category: | legalize: G_SHL <4 x s8> |
| Occurrences: | 3 in 2 configs, 1 test files |
| Snippet from: | rvp-simd-32.ll @test_psll_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_psll_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 = shl <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_SHL %0:_, %8:_(<4 x s8>) (in function: test_psll_bs)
warning: Instruction selection used fallback path for test_psll_bs
Occurrences (3):
| Input | Function | Config |
|---|
| rvp-simd-32.ll | test_psll_bs | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-32.ll | test_psll_bs_mask | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-32.211a00a3e4.ll (mutant of rvp-simd-32.ll) | test_psll_bs_vec_shamt | -mtriple=riscv32 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.