fallback: legalize: G_UNMERGE_VALUES <4 x s8>,<8 x s8>
| Run: | explore-bc8218b282-20261015-075519 |
| Kind: | fallback |
| Category: | legalize: G_UNMERGE_VALUES <4 x s8>,<8 x s8> |
| Occurrences: | 5 in 1 configs, 2 test files |
| Snippet from: | rvp-widening-convert.ll @test_pwcvt_v4i8 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 i16> @test_pwcvt_v4i8(<4 x i8> %a) {
%res = sext <4 x i8> %a to <4 x i16>
ret <4 x i16> %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: %0:_(<4 x s8>), %2:_(<4 x s8>) = G_UNMERGE_VALUES %1:_(<8 x s8>) (in function: test_pwcvt_v4i8)
warning: Instruction selection used fallback path for test_pwcvt_v4i8
Occurrences (5):
| Input | Function | Config |
|---|
| rvp-simd-64.ll | test_zext_v4i8_to_v4i16 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-64.ll | test_sext_v4i8_to_v4i16 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-widening-convert.ll | test_pwcvt_v4i8 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-widening-convert.ll | test_pwcvtu_v4i8 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-64.226bb4c2f7.ll (mutant of rvp-simd-64.ll) | test_zext_v4i8_to_v4i16 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.