fallback: legalize: G

fallback: legalize: G_FMAXIMUM s16

Run:	main-04ca53e65f-20261014-105623
Kind:	fallback
Category:	legalize: G_FMAXIMUM s16
Occurrences:	26 in 8 configs, 2 test files
Snippet from:	half-maximum-minimum.ll @fmaximum_f16 via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define half @fmaximum_f16(half %a, half %b) #0 {
  %1 = call half @llvm.maximum.f16(half %a, half %b)
  ret half %1
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare half @llvm.maximum.f16(half, half) #1

attributes #0 = { nounwind }
attributes #1 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }

Reproduce:

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

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(s16) = G_FMAXIMUM %0:_, %1:_ (in function: fmaximum_f16)
warning: Instruction selection used fallback path for fmaximum_f16

Occurrences (26):

Input	Function	Config
half-maximum-minimum.ll	fmaximum_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-maximum-minimum.ll	fmaximum_nnan_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-maximum-minimum.ll	fmaximum_nnan_op_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-maximum-minimum.ll	fmaximum_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-maximum-minimum.ll	fmaximum_nnan_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-maximum-minimum.ll	fmaximum_nnan_op_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-maximum-minimum.ll	fmaximum_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-maximum-minimum.ll	fmaximum_nnan_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-maximum-minimum.ll	fmaximum_nnan_op_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-maximum-minimum.ll	fmaximum_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-maximum-minimum.ll	fmaximum_nnan_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-maximum-minimum.ll	fmaximum_nnan_op_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-maximum-minimum.ll	fmaximum_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-maximum-minimum.ll	fmaximum_nnan_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-maximum-minimum.ll	fmaximum_nnan_op_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-maximum-minimum.ll	fmaximum_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-maximum-minimum.ll	fmaximum_nnan_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-maximum-minimum.ll	fmaximum_nnan_op_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-zfa.ll	fmaxm_h	`-mtriple=riscv32 -target-abi ilp32f -mattr=+zfa,+zfhmin`
half-zfa.ll	fmaxm_h	`-mtriple=riscv64 -target-abi lp64f -mattr=+zfa,+zfhmin`
half-maximum-minimum.01ec66bbc6.ll (mutant of half-maximum-minimum.ll)	fmaximum_nnan_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-maximum-minimum.132877cd71.ll (mutant of half-maximum-minimum.ll)	fmaximum_nnan_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-maximum-minimum.69faedb4b8.ll (mutant of half-maximum-minimum.ll)	fmaximum_nnan_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-maximum-minimum.a8d561e308.ll (mutant of half-maximum-minimum.ll)	fmaximum_nnan_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-maximum-minimum.b7ebb6d35e.ll (mutant of half-maximum-minimum.ll)	fmaximum_nnan_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-maximum-minimum.e5c949c5ce.ll (mutant of half-maximum-minimum.ll)	fmaximum_nnan_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`

Generated 2026-10-15 08:05 UTC.