fallback: legalize: G_UNMERGE_VALUES <2 x s16>,<4 x s16>
| Run: | main-04ca53e65f-20261014-105623 |
| Kind: | fallback |
| Category: | legalize: G_UNMERGE_VALUES <2 x s16>,<4 x s16> |
| Occurrences: | 4 in 1 configs, 2 test files |
| Snippet from: | rvp-widening-convert.ll @test_pwcvt_v2i16 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 <2 x i32> @test_pwcvt_v2i16(<2 x i16> %a) {
%res = sext <2 x i16> %a to <2 x i32>
ret <2 x i32> %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:_(<2 x s16>), %2:_(<2 x s16>) = G_UNMERGE_VALUES %1:_(<4 x s16>) (in function: test_pwcvt_v2i16)
warning: Instruction selection used fallback path for test_pwcvt_v2i16
Occurrences (4):
| Input | Function | Config |
|---|
| rvp-simd-64.ll | test_zext_v2i16_to_v2i32 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-64.ll | test_sext_v2i16_to_v2i32 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-widening-convert.ll | test_pwcvt_v2i16 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-widening-convert.ll | test_pwcvtu_v2i16 | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.