fallback: legalize: G_EXTRACT_VECTOR_ELT s32,<4 x s32>
| Run: | main-bc8218b282-20261015-074651 |
| Kind: | fallback |
| Category: | legalize: G_EXTRACT_VECTOR_ELT s32,<4 x s32> |
| Occurrences: | 10 in 2 configs, 2 test files |
| Snippet from: | reduction-formation.ll @reduce_sum_4xi32 via llvm-extract |
| Config: | -mtriple=riscv32 -verify-machineinstrs |
| Local check: | reproduces at bc8218b282 |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
define i32 @reduce_sum_4xi32(<4 x i32> %v) {
%e0 = extractelement <4 x i32> %v, i32 0
%e1 = extractelement <4 x i32> %v, i32 1
%e2 = extractelement <4 x i32> %v, i32 2
%e3 = extractelement <4 x i32> %v, i32 3
%add0 = add i32 %e0, %e1
%add1 = add i32 %add0, %e2
%add2 = add i32 %add1, %e3
ret i32 %add2
}
Reproduce:
llc -mtriple=riscv32 -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -verify-machineinstrs -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %8:_(s32) = G_EXTRACT_VECTOR_ELT %0:_(<4 x s32>), %9:_(s32) (in function: reduce_sum_4xi32)
warning: Instruction selection used fallback path for reduce_sum_4xi32
Occurrences (10):
| Input | Function | Config |
|---|
| double_reduct.ll | fmul_f32 | -mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs |
| double_reduct.ll | mul_i32 | -mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs |
| reduction-formation.ll | reduce_sum_4xi32 | -mtriple=riscv32 -verify-machineinstrs |
| reduction-formation.ll | reduce_xor_4xi32 | -mtriple=riscv32 -verify-machineinstrs |
| reduction-formation.ll | reduce_or_4xi32 | -mtriple=riscv32 -verify-machineinstrs |
| reduction-formation.089696a00a.ll (mutant of reduction-formation.ll) | reduce_or_4xi32 | -mtriple=riscv32 -verify-machineinstrs |
| reduction-formation.2260f0f15a.ll (mutant of reduction-formation.ll) | reduce_xor_4xi32 | -mtriple=riscv32 -verify-machineinstrs |
| reduction-formation.aa7fe9eeca.ll (mutant of reduction-formation.ll) | reduce_or_4xi32 | -mtriple=riscv32 -verify-machineinstrs |
| reduction-formation.e5338b3540.ll (mutant of reduction-formation.ll) | reduce_xor_4xi32 | -mtriple=riscv32 -verify-machineinstrs |
| reduction-formation.e5338b3540.ll (mutant of reduction-formation.ll) | reduce_or_4xi32 | -mtriple=riscv32 -verify-machineinstrs |
Generated 2026-10-15 08:05 UTC.