fallback: legalize: G_EXTRACT_VECTOR_ELT s8,<8 x s8>,s32
| Run: | explore-04ca53e65f-20261014-114124 |
| Kind: | fallback |
| Category: | legalize: G_EXTRACT_VECTOR_ELT s8,<8 x s8>,s32 NEW |
| Occurrences: | 3 in 3 configs, 1 test files |
| Snippet from: | rv32zba.9118559cf3.ll (mutant of rv32zba.ll) @srli_4_sh3add via llvm-extract |
| Config: | -mtriple=riscv32 -mattr=+m,+xandesperf -verify-machineinstrs |
| Local check: | reproduces at 04ca53e65f |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
define i64 @srli_4_sh3add(ptr %0, i32 %1) {
%3 = lshr i32 %1, 4
%E = extractelement <8 x i8> splat (i8 1), i32 %1
%4 = getelementptr inbounds i64, ptr %0, i32 %3
%5 = load i64, ptr %4, align 8
store i8 %E, ptr %4, align 1
ret i64 %5
}
Reproduce:
llc -mtriple=riscv32 -mattr=+m,+xandesperf -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+m,+xandesperf -verify-machineinstrs -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %4:_(s8) = G_EXTRACT_VECTOR_ELT %5:_(<8 x s8>), %1:_(s32) (in function: srli_4_sh3add)
warning: Instruction selection used fallback path for srli_4_sh3add
Occurrences (3):
| Input | Function | Config |
|---|
| rv32zba.9118559cf3.ll (mutant of rv32zba.ll) | srli_4_sh3add | -mtriple=riscv32 -mattr=+m,+xandesperf -verify-machineinstrs |
| rv32zba.96a24002c5.ll (mutant of rv32zba.ll) | srli_4_sh3add | -mtriple=riscv32 -mattr=+m -verify-machineinstrs |
| rv32zba.ec0f2a9601.ll (mutant of rv32zba.ll) | srli_4_sh3add | -mtriple=riscv32 -mattr=+m,+zba -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.