fallback: legalize: G

fallback: legalize: G_FMINNUM s16

Run:	main-bc8218b282-20261015-074651
Kind:	fallback
Category:	legalize: G_FMINNUM s16
Occurrences:	24 in 14 configs, 2 test files
Snippet from:	half-arith.ll @fmin_h via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

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

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

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

Reproduce:

llc -mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+zfhmin -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_FMINNUM %0:_, %1:_ (in function: fmin_h)
warning: Instruction selection used fallback path for fmin_h

Occurrences (24):

Input	Function	Config
half-arith.ll	fmin_h	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-arith.ll	fmin_h	`-mtriple=riscv32 -verify-machineinstrs`
half-arith.ll	fmin_h	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-arith.ll	fmin_h	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.ll	minnum_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	minnum_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	minnum_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.ll	minnum_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	minnum_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	minnum_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.12fe82b8e6.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.297fe69322.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.49bf86fdbf.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.579512088f.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.5d03dac0e0.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.5de7bfb660.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.8341831a0c.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.8af70e97ab.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.946c970a34.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.bf500ebd2f.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.c05081fd4a.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.c7e6afb5e4.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.d89a748b70.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.f3aaf54395.ll (mutant of half-intrinsics.ll)	minnum_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`

Generated 2026-10-15 08:05 UTC.