fallback: legalize: G_FMAXIMUMNUM s16

Run:	main-bc8218b282-20261015-074651
Kind:	fallback
Category:	legalize: G_FMAXIMUMNUM s16
Occurrences:	6 in 6 configs, 1 test files
Snippet from:	half-intrinsics.ll @maximumnum_half via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define half @maximumnum_half(half %x, half %y) {
  %z = call half @llvm.maximumnum.f16(half %x, half %y)
  ret half %z
}

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

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

Reproduce:

llc -mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(s16) = G_FMAXIMUMNUM %0:_, %1:_ (in function: maximumnum_half)
warning: Instruction selection used fallback path for maximumnum_half

Occurrences (6):

Input	Function	Config
half-intrinsics.ll	maximumnum_half	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	maximumnum_half	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	maximumnum_half	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.ll	maximumnum_half	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	maximumnum_half	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	maximumnum_half	`-mtriple=riscv64 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.