fallback: legalize: G_ADD <4 x s8>
| Run: | explore-bc8218b282-20261015-075519 |
| Kind: | fallback |
| Category: | legalize: G_ADD <4 x s8> |
| Occurrences: | 4 in 2 configs, 2 test files |
| Snippet from: | rvp-simd-32.ll @test_padd_bs_splat_lhs 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 <4 x i8> @test_padd_bs_splat_lhs(<4 x i8> %a, i8 %b) {
%insert = insertelement <4 x i8> poison, i8 %b, i32 0
%splat = shufflevector <4 x i8> %insert, <4 x i8> poison, <4 x i32> zeroinitializer
%res = add <4 x i8> %splat, %a
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_ADD %8:_, %0:_ (in function: test_padd_bs_splat_lhs)
warning: Instruction selection used fallback path for test_padd_bs_splat_lhs
Occurrences (4):
| Input | Function | Config |
|---|
| rvp-simd-32.ll | test_padd_bs_splat_lhs | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-32.ll | test_padd_bs_splat_rhs | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-32.8040ecd92f.ll (mutant of rvp-simd-32.ll) | test_padd_b | -mtriple=riscv32 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-widening-convert.2955de546e.ll (mutant of rvp-widening-convert.ll) | test_pwcvtu_v4i8 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.