fallback: legalize: G_SELECT <64 x s8>,<64 x s1>

Run:	main-04ca53e65f-20261014-113325
Kind:	fallback
Category:	legalize: G_SELECT <64 x s8>,<64 x s1>
Occurrences:	1 in 1 configs, 1 test files
Snippet from:	combine-storetomstore.ll @test_masked_store_success_v64i8 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_v64i8(<64 x i8> %x, ptr %ptr, <64 x i1> %mask) {
  %load = load <64 x i8>, ptr %ptr, align 32
  %sel = select <64 x i1> %mask, <64 x i8> %x, <64 x i8> %load
  store <64 x i8> %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:_(<64 x s8>) = G_SELECT %2:_(<64 x s1>), %0:_, %5:_ (in function: test_masked_store_success_v64i8)
warning: Instruction selection used fallback path for test_masked_store_success_v64i8

Occurrences (1):

Input	Function	Config
combine-storetomstore.ll	test_masked_store_success_v64i8	`-mtriple=riscv64-- -mattr=+m,+v,+f`

Generated 2026-10-15 08:05 UTC.