fallback: legalize: G_SELECT <4 x s16>,<4 x s1>

Run:	main-bc8218b282-20261015-074651
Kind:	fallback
Category:	legalize: G_SELECT <4 x s16>,<4 x s1>
Occurrences:	16 in 2 configs, 2 test files
Snippet from:	combine-storetomstore.ll @test_masked_store_success_v4i16 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_v4i16(<4 x i16> %x, ptr %ptr, <4 x i1> %mask) {
  %load = load <4 x i16>, ptr %ptr, align 32
  %sel = select <4 x i1> %mask, <4 x i16> %x, <4 x i16> %load
  store <4 x i16> %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:_(<4 x s16>) = G_SELECT %2:_(<4 x s1>), %0:_, %5:_ (in function: test_masked_store_success_v4i16)
warning: Instruction selection used fallback path for test_masked_store_success_v4i16

Occurrences (16):

Input	Function	Config
combine-storetomstore.ll	test_masked_store_success_v4i16	`-mtriple=riscv64-- -mattr=+m,+v,+f`
combine-storetomstore.ll	test_masked_store_success_v4f16	`-mtriple=riscv64-- -mattr=+m,+v,+f`
rvp-simd-64.ll	test_psadd_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_psaddu_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_pssub_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_pssubu_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_pssh1sadd_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_pssh1sadd_h_addself	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_psslai_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_pssla_hs	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_pssla_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_smin_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_umin_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_smax_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_umax_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_vselect_v4i16	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.