fallback: legalize: G_LSHR <4 x s16>

Run:	main-bc8218b282-20261015-074651
Kind:	fallback
Category:	legalize: G_LSHR <4 x s16>
Occurrences:	5 in 1 configs, 2 test files
Snippet from:	rvp-simd-64.ll @test_psrli_h via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define <4 x i16> @test_psrli_h(<4 x i16> %a) {
  %res = lshr <4 x i16> %a, splat (i16 2)
  ret <4 x i16> %res
}

Reproduce:

llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %3:_(<4 x s16>) = G_LSHR %0:_, %1:_(<4 x s16>) (in function: test_psrli_h)
warning: Instruction selection used fallback path for test_psrli_h

Occurrences (5):

Input	Function	Config
rvp-simd-64.ll	test_psrli_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_psrl_hs	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_psrl_hs_mask	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_pudiv_mulhu_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-narrowing-zip.b45bd3c36a.ll (mutant of rvp-narrowing-zip.ll)	test_pnziph_v4i16	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.