fallback: legalize: G_VECREDUCE_ADD s32,<4 x s32>
| Run: | main-04ca53e65f-20261014-113325 |
| Kind: | fallback |
| Category: | legalize: G_VECREDUCE_ADD s32,<4 x s32> |
| Occurrences: | 6 in 3 configs, 2 test files |
| Snippet from: | double_reduct.ll @add_i32 via llvm-extract |
| Config: | -mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs |
| Local check: | reproduces at 04ca53e65f |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
define i32 @add_i32(<4 x i32> %a, <4 x i32> %b) {
%r1 = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %a)
%r2 = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %b)
%r = add i32 %r1, %r2
ret i32 %r
}
; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #0
attributes #0 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }
Reproduce:
llc -mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %5:_(s32) = G_VECREDUCE_ADD %1:_(<4 x s32>) (in function: add_i32)
warning: Instruction selection used fallback path for add_i32
Occurrences (6):
| Input | Function | Config |
|---|
| double_reduct.ll | add_i32 | -mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs |
| double_reduct.ll | add_i32 | -mtriple=riscv64 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=lp64d -verify-machineinstrs |
| zero-call-used-regs-v.ll | used | -verify-machineinstrs -mtriple=riscv64 -mattr=+v |
| zero-call-used-regs-v.25853f4b28.ll (mutant of zero-call-used-regs-v.ll) | used | -verify-machineinstrs -mtriple=riscv64 -mattr=+v |
| zero-call-used-regs-v.311049b538.ll (mutant of zero-call-used-regs-v.ll) | used | -verify-machineinstrs -mtriple=riscv64 -mattr=+v |
| zero-call-used-regs-v.4c55899875.ll (mutant of zero-call-used-regs-v.ll) | used | -verify-machineinstrs -mtriple=riscv64 -mattr=+v |
Generated 2026-10-15 08:05 UTC.