fallback: legalize: G_SELECT <8 x s64>,<8 x s1>

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_SELECT <8 x s64>,<8 x s1>
Occurrences:	4 in 1 configs, 1 test files
Snippet from:	combine-storetomstore.ll @test_masked_store_success_v8i64 via llvm-extract
Config:	`-mtriple=riscv64-- -mattr=+m,+v,+f`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define void @test_masked_store_success_v8i64(<8 x i64> %x, ptr %ptr, <8 x i1> %mask) {
  %load = load <8 x i64>, ptr %ptr, align 32
  %sel = select <8 x i1> %mask, <8 x i64> %x, <8 x i64> %load
  store <8 x i64> %sel, ptr %ptr, align 32
  ret void
}

Reproduce:

llc -mtriple=riscv64-- -mattr=+m,+v,+f -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64-- -mattr=+m,+v,+f -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %6:_(<8 x s64>) = G_SELECT %2:_(<8 x s1>), %0:_, %5:_ (in function: test_masked_store_success_v8i64)
warning: Instruction selection used fallback path for test_masked_store_success_v8i64

Occurrences (4):

Input	Function	Config
combine-storetomstore.ll	test_masked_store_success_v8i64	`-mtriple=riscv64-- -mattr=+m,+v,+f`
combine-storetomstore.ll	test_masked_store_success_v8f64	`-mtriple=riscv64-- -mattr=+m,+v,+f`
combine-storetomstore.ll	test_masked_store_multiple_v8i64	`-mtriple=riscv64-- -mattr=+m,+v,+f`
combine-storetomstore.ll	test_masked_store_unaligned_v8i64	`-mtriple=riscv64-- -mattr=+m,+v,+f`

Generated 2026-10-15 08:05 UTC.