fallback: legalize: G_SELECT <16 x s32>,<16 x s1>

Run:	main-bc8218b282-20261015-074651
Kind:	fallback
Category:	legalize: G_SELECT <16 x s32>,<16 x s1>
Occurrences:	2 in 1 configs, 1 test files
Snippet from:	combine-storetomstore.ll @test_masked_store_success_v16i32 via llvm-extract
Config:	`-mtriple=riscv64-- -mattr=+m,+v,+f`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define void @test_masked_store_success_v16i32(<16 x i32> %x, ptr %ptr, <16 x i1> %mask) {
  %load = load <16 x i32>, ptr %ptr, align 32
  %sel = select <16 x i1> %mask, <16 x i32> %x, <16 x i32> %load
  store <16 x i32> %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:_(<16 x s32>) = G_SELECT %2:_(<16 x s1>), %0:_, %5:_ (in function: test_masked_store_success_v16i32)
warning: Instruction selection used fallback path for test_masked_store_success_v16i32

Occurrences (2):

Input	Function	Config
combine-storetomstore.ll	test_masked_store_success_v16i32	`-mtriple=riscv64-- -mattr=+m,+v,+f`
combine-storetomstore.ll	test_masked_store_success_invert_mask_v16i32	`-mtriple=riscv64-- -mattr=+m,+v,+f`

Generated 2026-10-15 08:05 UTC.