fallback: legalize: G

fallback: legalize: G_AND <2 x s64>

Run:	main-04ca53e65f-20261014-105623
Kind:	fallback
Category:	legalize: G_AND <2 x s64> NEW
Occurrences:	42 in 27 configs, 13 test files
Snippet from:	unaligned-load-store.56b23882de.ll (mutant of unaligned-load-store.ll) @store_i16 via llvm-extract + llvm-reduce
Config:	`-mtriple=riscv32 -mattr=+unaligned-scalar-mem -verify-machineinstrs`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	https://godbolt.org/z/cWs9Mh6fa (llc-assertions-trunk, checked 2026-10-14 11:04 UTC): G reproduces

Snippet:

define <2 x i64> @store_i16(<2 x i64> %LGV) {
  %B = and <2 x i64> zeroinitializer, %LGV
  ret <2 x i64> %B
}

Compiler Explorer panes:

Pane	Options	Exit	Insts	stderr
GlobalISel	`-mtriple=riscv32 -mattr=+unaligned-scalar-mem -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*`	0	5	remark: <unknown>:0:0: unable to legalize instruction: %5:_(<2 x s64>) = G_AND %3:_, %0:_ (in function: store_i16) warning: Instruction selection used fallback path for store_i16
SelectionDAG (control)	`-mtriple=riscv32 -mattr=+unaligned-scalar-mem -verify-machineinstrs -global-isel=0`	0	5	-

Reproduce:

llc -mtriple=riscv32 -mattr=+unaligned-scalar-mem -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+unaligned-scalar-mem -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %5:_(<2 x s64>) = G_AND %3:_, %0:_ (in function: store_i16)
warning: Instruction selection used fallback path for store_i16

Occurrences (42):

Input	Function	Config
atomic-rmw-discard.36199c8aac.ll (mutant of atomic-rmw-discard.ll)	amoor_d_discard	`-O3 -mtriple=riscv64 -mattr=+a -verify-machineinstrs`
atomic-rmw-discard.67b1352c0f.ll (mutant of atomic-rmw-discard.ll)	amoor_d_discard	`-O3 -mtriple=riscv32 -mattr=+a -verify-machineinstrs`
clmul.1b3531a208.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zbc -verify-machineinstrs`
clmul.1bfdb490a5.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
clmul.29604ed1cf.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv32 -mattr=+m,+zbc -verify-machineinstrs`
clmul.47cd8d0ddb.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv32 -mattr=+m,+zbs -verify-machineinstrs`
clmul.64584303c3.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
clmul.adf8c75b84.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv32 -mattr=+m,+zvbc -verify-machineinstrs`
clmul.cc372104c7.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zbs -verify-machineinstrs`
clmul.cfd8abb954.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv32 -verify-machineinstrs`
clmul.ef1a224d30.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zvbc -verify-machineinstrs`
clmul.ff7690c01e.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -verify-machineinstrs`
div-pow2.1cddbd3792.ll (mutant of div-pow2.ll)	sdiv32_pow2_negative_65536	`-mtriple=riscv64 -verify-machineinstrs`
div-pow2.38c18ecbaa.ll (mutant of div-pow2.ll)	sdiv32_pow2_negative_65536	`-mtriple=riscv32 -verify-machineinstrs`
ghccc-without-f-reg.009f628c9f.ll (mutant of ghccc-without-f-reg.ll)	caller_float	`-mtriple=riscv64 -mattr=+zfinx,+zdinx`
half-zfa.2f24215484.ll (mutant of half-zfa.ll)	fround_h_6	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin`
half-zfa.5205b712e8.ll (mutant of half-zfa.ll)	fround_h_6	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh`
half-zfa.ab81e96667.ll (mutant of half-zfa.ll)	fround_h_6	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfhmin`
half-zfa.c293562a2c.ll (mutant of half-zfa.ll)	fround_h_6	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh`
orc-b-patterns.4d5fdf031f.ll (mutant of orc-b-patterns.ll)	orc_b_i32_sub_shl8x_x_b5	`-mtriple=riscv64 -verify-machineinstrs`
orc-b-patterns.5e8f0b788f.ll (mutant of orc-b-patterns.ll)	orc_b_i32_sub_shl8x_x_b5	`-mtriple=riscv32 -mattr=+zbb -verify-machineinstrs`
orc-b-patterns.6924822b81.ll (mutant of orc-b-patterns.ll)	orc_b_i32_sub_shl8x_x_b5	`-mtriple=riscv32 -verify-machineinstrs`
orc-b-patterns.78a2d74b4a.ll (mutant of orc-b-patterns.ll)	orc_b_i32_sub_shl8x_x_b5	`-mtriple=riscv64 -mattr=+zbb -verify-machineinstrs`
rem.1c24b9850c.ll (mutant of rem.ll)	urem64_constant_lhs	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
rem.42777ca7a8.ll (mutant of rem.ll)	urem64_constant_lhs	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
rem.517625cd89.ll (mutant of rem.ll)	urem64_constant_lhs	`-mtriple=riscv32 -verify-machineinstrs`
rem.de9c7ef9fe.ll (mutant of rem.ll)	urem64_constant_lhs	`-mtriple=riscv64 -verify-machineinstrs`
rvp-zip.8603ff7778.ll (mutant of rvp-zip.ll)	test_unzip8hp_v8i8	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
shifts.40023a0201.ll (mutant of shifts.ll)	ashr128	`-mtriple=riscv64 -verify-machineinstrs`
shifts.bf7b27707f.ll (mutant of shifts.ll)	ashr128	`-mtriple=riscv32 -verify-machineinstrs`
shlimm-addimm.a0fa46eb9b.ll (mutant of shlimm-addimm.ll)	shl5_add47968_b	`-mtriple=riscv64 -verify-machineinstrs`
shlimm-addimm.b5911d4944.ll (mutant of shlimm-addimm.ll)	shl5_add47968_b	`-mtriple=riscv32 -verify-machineinstrs`
unaligned-load-store.56b23882de.ll (mutant of unaligned-load-store.ll)	store_i16	`-mtriple=riscv32 -mattr=+unaligned-scalar-mem -verify-machineinstrs`
unaligned-load-store.a648648d7e.ll (mutant of unaligned-load-store.ll)	store_i16	`-mtriple=riscv64 -mattr=+zbkb -verify-machineinstrs`
unaligned-load-store.c44fc51b42.ll (mutant of unaligned-load-store.ll)	store_i16	`-mtriple=riscv64 -verify-machineinstrs`
unaligned-load-store.df7414bd2d.ll (mutant of unaligned-load-store.ll)	store_i16	`-mtriple=riscv64 -mattr=+unaligned-scalar-mem -verify-machineinstrs`
unaligned-load-store.f01b07be87.ll (mutant of unaligned-load-store.ll)	store_i16	`-mtriple=riscv32 -mattr=+zbkb -verify-machineinstrs`
unaligned-load-store.f26d100fe2.ll (mutant of unaligned-load-store.ll)	store_i16	`-mtriple=riscv32 -verify-machineinstrs`
xcvmac.620c450843.ll (mutant of xcvmac.ll)	test.mulhhuRN	`-mtriple=riscv32 -mattr=+m -mattr=+xcvmac -verify-machineinstrs`
xqcibm-insert.4a50daad42.ll (mutant of xqcibm-insert.ll)	test2	`-mtriple=riscv32 -verify-machineinstrs`
xqcibm-insert.be24c218cb.ll (mutant of xqcibm-insert.ll)	test2	`-mtriple=riscv32 -mattr=+xqcibm -verify-machineinstrs`
xqcibm-insert.cfa9f48dad.ll (mutant of xqcibm-insert.ll)	test2	`-mtriple=riscv32 -mattr=+xqcibm,+zbs -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.