fallback: legalize: G_SUB <2 x s32>
| Run: | explore-04ca53e65f-20261014-114124 |
| Kind: | fallback |
| Category: | legalize: G_SUB <2 x s32> |
| Occurrences: | 10 in 2 configs, 3 test files |
| Snippet from: | rvp-simd-32.ll @test_pwsub_h 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_pwsub_h(<2 x i16> %a, <2 x i16> %b) {
%a_ext = sext <2 x i16> %a to <2 x i32>
%b_ext = sext <2 x i16> %b to <2 x i32>
%res = sub <2 x i32> %a_ext, %b_ext
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: %8:_(<2 x s32>) = G_SUB %6:_, %7:_ (in function: test_pwsub_h)
warning: Instruction selection used fallback path for test_pwsub_h
Occurrences (10):
| Input | Function | Config |
|---|
| rvp-simd-32.ll | test_pwsub_h | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-32.ll | test_pwsubu_h | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-64.ll | test_pdif_w | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-64.ll | test_pdifu_w | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-simd-64.ll | test_psub_w | -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs |
| rvp-widening-sub-acc.ll | test_pwsuba_v2i16 | -mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs |
| rvp-widening-sub-acc.ll | test_pwsubau_v2i16 | -mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs |
| rvp-widening-sub-acc.542cab1fe2.ll (mutant of rvp-widening-sub-acc.ll) | test_pwsubau_v2i16 | -mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs |
| rvp-widening-sub-acc.7defddaf3e.ll (mutant of rvp-widening-sub-acc.ll) | test_pwsuba_v2i16 | -mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs |
| rvp-widening-sub-acc.fcfc451f07.ll (mutant of rvp-widening-sub-acc.ll) | test_pwsuba_v2i16 | -mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.