fallback: legalize: G

fallback: legalize: G_AND <4 x s32>

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_AND <4 x s32> NEW
Occurrences:	53 in 37 configs, 14 test files
Snippet from:	half-zfa-fli.0528b815ca.ll (mutant of half-zfa-fli.ll) @loadfpimm9 via llvm-extract + llvm-reduce
Config:	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin`
Local check:	reproduces at bc8218b282
Compiler Explorer:	https://godbolt.org/z/1KG7haKrE (llc-assertions-trunk, checked 2026-10-15 08:05 UTC): G reproduces

Snippet:

define <4 x i32> @loadfpimm9(<4 x i32> %LGV) {
  %B = and <4 x i32> %LGV, splat (i32 1)
  ret <4 x i32> %B
}

Compiler Explorer panes:

Pane	Options	Exit	Insts	stderr
GlobalISel	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*`	0	13	remark: <unknown>:0:0: unable to legalize instruction: %5:_(<4 x s32>) = G_AND %0:_, %3:_ (in function: loadfpimm9) warning: Instruction selection used fallback path for loadfpimm9
SelectionDAG (control)	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin -global-isel=0`	0	13	-

Reproduce:

llc -mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %5:_(<4 x s32>) = G_AND %0:_, %3:_ (in function: loadfpimm9)
warning: Instruction selection used fallback path for loadfpimm9

Occurrences (53) (first 50):

Input	Function	Config
branch.8053842e5c.ll (mutant of branch.ll)	foo	`-mtriple=riscv32 -verify-machineinstrs`
branch.e2bd151b89.ll (mutant of branch.ll)	foo	`-mtriple=riscv32 -verify-machineinstrs -block-placement-predecessor-limit=10`
bswap-bitreverse.00008ea979.ll (mutant of bswap-bitreverse.ll)	test_bswap_bitreverse_i16	`-mtriple=riscv64 -mattr=+zbb -verify-machineinstrs`
bswap-bitreverse.1a44b013a5.ll (mutant of bswap-bitreverse.ll)	test_bswap_bitreverse_i16	`-mtriple=riscv32 -verify-machineinstrs`
bswap-bitreverse.24ef41cc12.ll (mutant of bswap-bitreverse.ll)	test_bswap_bitreverse_i16	`-mtriple=riscv32 -mattr=+zbb -verify-machineinstrs`
bswap-bitreverse.348b19ad34.ll (mutant of bswap-bitreverse.ll)	test_bswap_bitreverse_i16	`-mtriple=riscv64 -mattr=+zbkb -verify-machineinstrs`
bswap-bitreverse.85104f6f73.ll (mutant of bswap-bitreverse.ll)	test_bswap_bitreverse_i16	`-mtriple=riscv32 -mattr=+zbb,+experimental-p -verify-machineinstrs`
bswap-bitreverse.8ad58d6b8e.ll (mutant of bswap-bitreverse.ll)	test_bswap_bitreverse_i16	`-mtriple=riscv64 -verify-machineinstrs`
bswap-bitreverse.c584bd46bd.ll (mutant of bswap-bitreverse.ll)	test_bswap_bitreverse_i16	`-mtriple=riscv32 -mattr=+zbkb -verify-machineinstrs`
bswap-bitreverse.dedbcaa294.ll (mutant of bswap-bitreverse.ll)	test_bswap_bitreverse_i16	`-mtriple=riscv64 -mattr=+zbb,+experimental-p -verify-machineinstrs`
double_reduct.e04650ceb8.ll (mutant of double_reduct.ll)	and_i32	`-mtriple=riscv64 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=lp64d -verify-machineinstrs`
double_reduct.fcfec5b501.ll (mutant of double_reduct.ll)	and_i32	`-mtriple=riscv32 -mattr=+d,+zfh,+zvfh,+v,+m -target-abi=ilp32d -verify-machineinstrs`
fold-mem-offset.7a13abbce6.ll (mutant of fold-mem-offset.ll)	test_scaled_index_addi	`-mtriple=riscv32`
fold-mem-offset.82afced764.ll (mutant of fold-mem-offset.ll)	test_scaled_index_addi	`-mtriple=riscv64 -mattr=+zba`
fold-mem-offset.91db9c95db.ll (mutant of fold-mem-offset.ll)	test_scaled_index_addi	`-mtriple=riscv64`
fold-mem-offset.f23dbc76c0.ll (mutant of fold-mem-offset.ll)	test_scaled_index_addi	`-mtriple=riscv32 -mattr=+zba`
half-zfa-fli.0528b815ca.ll (mutant of half-zfa-fli.ll)	loadfpimm9	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin`
half-zfa-fli.6e93461393.ll (mutant of half-zfa-fli.ll)	loadfpimm9	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh`
half-zfa-fli.794abffcfe.ll (mutant of half-zfa-fli.ll)	loadfpimm9	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfhmin`
half-zfa-fli.bd91628c65.ll (mutant of half-zfa-fli.ll)	loadfpimm9	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh`
libcall-tail-calls.040ea67891.ll (mutant of libcall-tail-calls.ll)	sin_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
libcall-tail-calls.5e6d487c5d.ll (mutant of libcall-tail-calls.ll)	sin_f64	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32`
libcall-tail-calls.6371224da6.ll (mutant of libcall-tail-calls.ll)	sin_f64	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
libcall-tail-calls.878f92d1f6.ll (mutant of libcall-tail-calls.ll)	sin_f64	`-mtriple=riscv32 -verify-machineinstrs`
libcall-tail-calls.9dd57dd5f0.ll (mutant of libcall-tail-calls.ll)	sin_f64	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -target-abi=ilp32f`
libcall-tail-calls.af86f750e2.ll (mutant of libcall-tail-calls.ll)	sin_f64	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -target-abi=lp64f`
libcall-tail-calls.b76f64bd07.ll (mutant of libcall-tail-calls.ll)	sin_f64	`-mtriple=riscv64 -verify-machineinstrs`
libcall-tail-calls.e410674e57.ll (mutant of libcall-tail-calls.ll)	sin_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64`
llvm.frexp.037bbd5392.ll (mutant of llvm.frexp.ll)	test_frexp_v4f32_v4i32_only_use_exp	`-mtriple=riscv64 -verify-machineinstrs`
llvm.frexp.8b6e7fd0e0.ll (mutant of llvm.frexp.ll)	test_frexp_v4f32_v4i32_only_use_exp	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
llvm.frexp.d536056939.ll (mutant of llvm.frexp.ll)	test_frexp_v4f32_v4i32_only_use_exp	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
llvm.frexp.dc1a807f1c.ll (mutant of llvm.frexp.ll)	test_frexp_v4f32_v4i32_only_use_exp	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64`
llvm.frexp.ed2a330917.ll (mutant of llvm.frexp.ll)	test_frexp_v4f32_v4i32_only_use_exp	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32`
llvm.frexp.f953c928c0.ll (mutant of llvm.frexp.ll)	test_frexp_v4f32_v4i32_only_use_exp	`-mtriple=riscv32 -verify-machineinstrs`
narrow-shl-cst.317e8a5625.ll (mutant of narrow-shl-cst.ll)	test9	`-mtriple=riscv64`
narrow-shl-cst.a1baf77916.ll (mutant of narrow-shl-cst.ll)	test9	`-mtriple=riscv32`
reduction-formation.9bc39f9be2.ll (mutant of reduction-formation.ll)	reduce_xor_4xi32	`-mtriple=riscv32 -verify-machineinstrs`
reduction-formation.ccc638ada3.ll (mutant of reduction-formation.ll)	reduce_xor_4xi32	`-mtriple=riscv64 -verify-machineinstrs`
rv64m-exhaustive-w-insts.6aaae34c02.ll (mutant of rv64m-exhaustive-w-insts.ll)	sext_divw_sext_sext	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
shadowcallstack.001a1d0330.ll (mutant of shadowcallstack.ll)	f4_hw	`-mtriple=riscv32 -verify-machineinstrs -mattr=+zcmp,+zimop`
shadowcallstack.2ec8303781.ll (mutant of shadowcallstack.ll)	f4_hw	`-mtriple=riscv64 -verify-machineinstrs -mattr=+zcmp,+zimop,+zcmop`
shadowcallstack.4ccc375a9c.ll (mutant of shadowcallstack.ll)	f4_hw	`-mtriple=riscv32 -verify-machineinstrs`
shadowcallstack.6887060a3a.ll (mutant of shadowcallstack.ll)	f4_hw	`-mtriple=riscv32 -mattr=+zimop -verify-machineinstrs`
shadowcallstack.7b62c193dd.ll (mutant of shadowcallstack.ll)	f4_hw	`-mtriple=riscv32 -mattr=+zimop,+zcmop -M no-aliases -verify-machineinstrs`
shadowcallstack.7d5a3b089c.ll (mutant of shadowcallstack.ll)	f4_hw	`-mtriple=riscv64 -verify-machineinstrs`
shadowcallstack.b83c8f9ad5.ll (mutant of shadowcallstack.ll)	f4_hw	`-mtriple=riscv64 -mattr=+zimop,+zcmop -M no-aliases -verify-machineinstrs`
shadowcallstack.e8d4ee50f0.ll (mutant of shadowcallstack.ll)	f4_hw	`-mtriple=riscv64 -mattr=+zimop -verify-machineinstrs`
signbit-test.4e467576a4.ll (mutant of signbit-test.ll)	test_clear_mask_i32_i8	`-mtriple=riscv64 -verify-machineinstrs`
signbit-test.5759982807.ll (mutant of signbit-test.ll)	test_clear_mask_i32_i8	`-mtriple=riscv32 -verify-machineinstrs`
xqcibi.0a67ab30c3.ll (mutant of xqcibi.ll)	bltimm16	`-mtriple=riscv32 -mattr=+xqcibi -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.