fallback: legalize: G_FCANONICALIZE s16

Run:	main-bc8218b282-20261015-074651
Kind:	fallback
Category:	legalize: G_FCANONICALIZE s16
Occurrences:	9 in 9 configs, 1 test files
Snippet from:	fp-fcanonicalize.ll @fcanonicalize_f16 via llvm-extract
Config:	`--mtriple=riscv32`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define half @fcanonicalize_f16(half %x) {
  %z = call nnan half @llvm.canonicalize.f16(half %x)
  ret half %z
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare half @llvm.canonicalize.f16(half) #0

attributes #0 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }

Reproduce:

llc --mtriple=riscv32 -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc --mtriple=riscv32 -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(s16) = nnan G_FCANONICALIZE %0:_ (in function: fcanonicalize_f16)
warning: Instruction selection used fallback path for fcanonicalize_f16

Occurrences (9):

Input	Function	Config
fp-fcanonicalize.ll	fcanonicalize_f16	`--mtriple=riscv32`
fp-fcanonicalize.ll	fcanonicalize_f16	`--mtriple=riscv32 --mattr=+d,-zfh`
fp-fcanonicalize.ll	fcanonicalize_f16	`--mtriple=riscv64`
fp-fcanonicalize.ll	fcanonicalize_f16	`--mtriple=riscv64 --mattr=+d,-zfh`
fp-fcanonicalize.ll	fcanonicalize_f16	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f16	`-mtriple=riscv32 -mattr=+zhinx -target-abi=ilp32 -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f16	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f16	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.