fallback: legalize: G_FMUL <4 x s32>

Run:	main-04ca53e65f-20261014-113325
Kind:	fallback
Category:	legalize: G_FMUL <4 x s32> NEW
Occurrences:	66 in 48 configs, 18 test files
Snippet from:	half-zfa-fli.32d01263d3.ll (mutant of half-zfa-fli.ll) @loadfpimm15 via llvm-extract + llvm-reduce
Config:	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	https://godbolt.org/z/P5cWEh5EE (llc-assertions-trunk, checked 2026-10-14 11:04 UTC): G reproduces

Snippet:

define <4 x float> @loadfpimm15() {
  %B = fmul <4 x float> zeroinitializer, zeroinitializer
  ret <4 x float> %B
}

Compiler Explorer panes:

Pane	Options	Exit	Insts	stderr
GlobalISel	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.*`	0	5	remark: <unknown>:0:0: unable to legalize instruction: %3:_(<4 x s32>) = G_FMUL %1:_, %1:_ (in function: loadfpimm15) warning: Instruction selection used fallback path for loadfpimm15
SelectionDAG (control)	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh -global-isel=0`	0	5	-

Reproduce:

llc -mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %3:_(<4 x s32>) = G_FMUL %1:_, %1:_ (in function: loadfpimm15)
warning: Instruction selection used fallback path for loadfpimm15

Occurrences (66) (first 50):

Input	Function	Config
and-negpow2-cmp.700f2a075a.ll (mutant of and-negpow2-cmp.ll)	PR221593	`-mtriple=riscv64`
and-negpow2-cmp.cd360cc52c.ll (mutant of and-negpow2-cmp.ll)	PR221593	`-mtriple=riscv32`
and.308a8333d2.ll (mutant of and.ll)	and64_0x00000000fffffff8	`-mtriple=riscv32 -verify-machineinstrs`
and.646823013f.ll (mutant of and.ll)	and64_0x00000000fffffff8	`-mtriple=riscv64 -verify-machineinstrs`
fold-mem-offset.21feb1ecdd.ll (mutant of fold-mem-offset.ll)	pr228053_frameindex_crash	`-mtriple=riscv32`
fold-mem-offset.31abbff133.ll (mutant of fold-mem-offset.ll)	pr228053_frameindex_crash	`-mtriple=riscv64 -mattr=+zba`
fold-mem-offset.83e88b513c.ll (mutant of fold-mem-offset.ll)	pr228053_frameindex_crash	`-mtriple=riscv32 -mattr=+zba`
fold-mem-offset.d8143e209e.ll (mutant of fold-mem-offset.ll)	pr228053_frameindex_crash	`-mtriple=riscv64`
ghccc-without-f-reg.40f62611eb.ll (mutant of ghccc-without-f-reg.ll)	caller_float	`-mtriple=riscv64 -mattr=+zfinx,+zdinx`
half-zfa-fli.32d01263d3.ll (mutant of half-zfa-fli.ll)	loadfpimm15	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfh`
half-zfa-fli.bcf1b05193.ll (mutant of half-zfa-fli.ll)	loadfpimm15	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfh`
half-zfa-fli.ecf544944a.ll (mutant of half-zfa-fli.ll)	loadfpimm15	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin`
half-zfa-fli.f5f2821706.ll (mutant of half-zfa-fli.ll)	loadfpimm15	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfhmin`
neg-abs.262b77a4e1.ll (mutant of neg-abs.ll)	expanded_neg_inv_abs64_unsigned	`-mtriple=riscv32 -verify-machineinstrs`
neg-abs.30bc6b166a.ll (mutant of neg-abs.ll)	expanded_neg_inv_abs64_unsigned	`-mtriple=riscv32 -mattr=+zbb -verify-machineinstrs`
neg-abs.4073111123.ll (mutant of neg-abs.ll)	expanded_neg_inv_abs64_unsigned	`-mtriple=riscv64 -mattr=+zbb -verify-machineinstrs`
neg-abs.ba1df49813.ll (mutant of neg-abs.ll)	expanded_neg_inv_abs64_unsigned	`-mtriple=riscv64 -verify-machineinstrs`
select-binop-identity.0de7e16f8f.ll (mutant of select-binop-identity.ll)	sub_select_all_zeros_i64	`-mtriple=riscv32 -verify-machineinstrs`
select-binop-identity.159f2a2790.ll (mutant of select-binop-identity.ll)	sub_select_all_zeros_i64	`-mtriple=riscv64 -mattr=+zicond -verify-machineinstrs`
select-binop-identity.45f6859701.ll (mutant of select-binop-identity.ll)	sub_select_all_zeros_i64	`-mtriple=riscv64 -mattr=+c,+conditional-cmv-fusion -verify-machineinstrs`
select-binop-identity.b7aa3d4791.ll (mutant of select-binop-identity.ll)	sub_select_all_zeros_i64	`-mtriple=riscv32 -mattr=+zicond -verify-machineinstrs`
select-binop-identity.ca5f76f45a.ll (mutant of select-binop-identity.ll)	sub_select_all_zeros_i64	`-mtriple=riscv64 -verify-machineinstrs`
select-binop-identity.eb83aa89f4.ll (mutant of select-binop-identity.ll)	sub_select_all_zeros_i64	`-mtriple=riscv64 -mcpu=sifive-u74 -verify-machineinstrs`
select-constant-xor.46f1106f01.ll (mutant of select-constant-xor.ll)	selecti32i64	`-mtriple=riscv32`
select-constant-xor.8ca1404173.ll (mutant of select-constant-xor.ll)	selecti32i64	`-mtriple=riscv64`
selectcc-to-shiftand.40d3132467.ll (mutant of selectcc-to-shiftand.ll)	sraiw_andi	`-mtriple=riscv64 -mattr=+zbb`
selectcc-to-shiftand.497818f312.ll (mutant of selectcc-to-shiftand.ll)	sraiw_andi	`-mtriple=riscv64`
selectcc-to-shiftand.4db744f223.ll (mutant of selectcc-to-shiftand.ll)	sraiw_andi	`-mtriple=riscv32`
selectcc-to-shiftand.aeb2395fe2.ll (mutant of selectcc-to-shiftand.ll)	sraiw_andi	`-mtriple=riscv32 -mattr=+zbb`
sfb-merge-base-offset.0f21a06e1b.ll (mutant of sfb-merge-base-offset.ll)	load_cond_ga_word	`-mtriple=riscv32 -verify-machineinstrs -mattr=+xqci,+short-forward-branch-iload`
sfb-merge-base-offset.34373c1bd4.ll (mutant of sfb-merge-base-offset.ll)	load_cond_ga_word	`-mtriple=riscv32 -verify-machineinstrs -mattr=+short-forward-branch-iload`
sfb-merge-base-offset.37132f5482.ll (mutant of sfb-merge-base-offset.ll)	load_cond_ga_word	`-mtriple=riscv64 -verify-machineinstrs -mattr=+short-forward-branch-iload`
shadowcallstack.0259ef00cc.ll (mutant of shadowcallstack.ll)	f5_both	`-mtriple=riscv32 -verify-machineinstrs`
shadowcallstack.0989e4bf35.ll (mutant of shadowcallstack.ll)	f5_both	`-mtriple=riscv64 -mattr=+zimop,+zcmop -M no-aliases -verify-machineinstrs`
shadowcallstack.226e78fe21.ll (mutant of shadowcallstack.ll)	f5_both	`-mtriple=riscv32 -verify-machineinstrs -mattr=+zcmp,+zimop`
shadowcallstack.4a6b3af0ee.ll (mutant of shadowcallstack.ll)	f5_both	`-mtriple=riscv32 -mattr=+zimop -verify-machineinstrs`
shadowcallstack.5950681a93.ll (mutant of shadowcallstack.ll)	f5_both	`-mtriple=riscv64 -verify-machineinstrs -mattr=+zcmp,+zimop,+zcmop`
shadowcallstack.5ff099dcd2.ll (mutant of shadowcallstack.ll)	f5_both	`-mtriple=riscv64 -verify-machineinstrs`
shadowcallstack.d048b8f1f6.ll (mutant of shadowcallstack.ll)	f5_both	`-mtriple=riscv32 -mattr=+zimop,+zcmop -M no-aliases -verify-machineinstrs`
shadowcallstack.d07864abc6.ll (mutant of shadowcallstack.ll)	f5_both	`-mtriple=riscv64 -mattr=+zimop -verify-machineinstrs`
stack-clash-prologue.6a28103beb.ll (mutant of stack-clash-prologue.ll)	f3	`-mtriple=riscv64 -mattr=+m -O2`
stack-clash-prologue.bc15e761f9.ll (mutant of stack-clash-prologue.ll)	f3	`-mtriple=riscv32 -mattr=+m -O2`
vararg-ilp32e.9389e0f093.ll (mutant of vararg-ilp32e.ll)	va_double	`-mtriple=riscv32 -target-abi ilp32e -frame-pointer=all -verify-machineinstrs`
vararg-ilp32e.eda8a49f26.ll (mutant of vararg-ilp32e.ll)	va_double	`-mtriple=riscv32 -target-abi ilp32e -verify-machineinstrs`
vararg.116ee3332f.ll (mutant of vararg.ll)	va_large_stack	`-mtriple=riscv32 -mattr=+d -target-abi ilp32d -verify-machineinstrs`
vararg.225ff0b189.ll (mutant of vararg.ll)	va_large_stack	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.2cc837e593.ll (mutant of vararg.ll)	va_large_stack	`-mtriple=riscv64 -verify-machineinstrs`
vararg.2fcd68b5d2.ll (mutant of vararg.ll)	va_large_stack	`-mtriple=riscv32 -verify-machineinstrs`
vararg.337df7a640.ll (mutant of vararg.ll)	va_large_stack	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.3d9c31c9bb.ll (mutant of vararg.ll)	va_large_stack	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`

Generated 2026-10-15 08:05 UTC.