fallback: legalize: G_EXTRACT_VECTOR

fallback: legalize: G_EXTRACT_VECTOR_ELT s16,<2 x s16>,s64

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_EXTRACT_VECTOR_ELT s16,<2 x s16>,s64
Occurrences:	13 in 8 configs, 3 test files
Snippet from:	rvp-simd-32.ll @test_extract_vector_16 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 i16 @test_extract_vector_16(<2 x i16> %a) {
  %extracted = extractelement <2 x i16> %a, i32 0
  ret i16 %extracted
}

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:_(s16) = G_EXTRACT_VECTOR_ELT %0:_(<2 x s16>), %4:_(s64) (in function: test_extract_vector_16)
warning: Instruction selection used fallback path for test_extract_vector_16

Occurrences (13):

Input	Function	Config
rvp-simd-32.ll	test_extract_vector_16	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-32.ll	test_extract_vector_16_elem1	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-srl-bitcast-bv.ll	srl_bitcast_buildvector_extract_last	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb`
fp-fcanonicalize.1140760f37.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_v2f16_nnan	`--mtriple=riscv64`
fp-fcanonicalize.51fa42b198.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_v2f16_nnan	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs`
fp-fcanonicalize.9486add67f.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_v2f16_nnan	`--mtriple=riscv64 --mattr=+d,-zfh`
fp-fcanonicalize.9be8d3122b.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_v2f16_nnan	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs`
fp-fcanonicalize.bffc90bbaf.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_v2f16_nnan	`--mtriple=riscv64 --mattr=+d,+zfh`
fp-fcanonicalize.fdd3056ba5.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_v2f16_nnan	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
rvp-srl-bitcast-bv.57e1ea08db.ll (mutant of rvp-srl-bitcast-bv.ll)	srl_bitcast_buildvector_extract_last	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb`
rvp-srl-bitcast-bv.6db360ad75.ll (mutant of rvp-srl-bitcast-bv.ll)	srl_bitcast_buildvector_extract_last	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb`
rvp-srl-bitcast-bv.9d77eb2843.ll (mutant of rvp-srl-bitcast-bv.ll)	srl_bitcast_buildvector_extract_last	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb`
rvp-srl-bitcast-bv.b7239cd3a7.ll (mutant of rvp-srl-bitcast-bv.ll)	srl_bitcast_buildvector_extract_last	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb`

Generated 2026-10-15 08:05 UTC.