fallback: legalize: G

fallback: legalize: G_FABS s16

Run:	main-bc8218b282-20261015-074651
Kind:	fallback
Category:	legalize: G_FABS s16
Occurrences:	47 in 21 configs, 2 test files
Snippet from:	half-bitmanip-dagcombines.ll @fabs via llvm-extract
Config:	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zfhmin -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

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

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

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

Reproduce:

llc -mtriple=riscv32 -target-abi ilp32 -mattr=+zfhmin -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -target-abi ilp32 -mattr=+zfhmin -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

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

Occurrences (47):

Input	Function	Config
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zfhmin -verify-machineinstrs`
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zhinx -verify-machineinstrs`
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zhinxmin -verify-machineinstrs`
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv32 -verify-machineinstrs`
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zfhmin -verify-machineinstrs`
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zhinx -verify-machineinstrs`
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zhinxmin -verify-machineinstrs`
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv64 -target-abi lp64 -verify-machineinstrs`
half-bitmanip-dagcombines.ll	fabs	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.ll	fabs_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	fabs_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	fabs_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.ll	fabs_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	fabs_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	fabs_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-bitmanip-dagcombines.20d0dcb10e.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zfhmin -verify-machineinstrs`
half-bitmanip-dagcombines.2591709625.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv32 -verify-machineinstrs`
half-bitmanip-dagcombines.26bff935f8.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zhinx -verify-machineinstrs`
half-bitmanip-dagcombines.2b23683df8.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zhinx -verify-machineinstrs`
half-bitmanip-dagcombines.2b99fe9dac.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zfhmin -verify-machineinstrs`
half-bitmanip-dagcombines.4d8871fbd1.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zhinx -verify-machineinstrs`
half-bitmanip-dagcombines.60b7873bca.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv32 -verify-machineinstrs`
half-bitmanip-dagcombines.73eb919ae7.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zhinxmin -verify-machineinstrs`
half-bitmanip-dagcombines.7ba30d8ce5.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zfhmin -verify-machineinstrs`
half-bitmanip-dagcombines.89547141de.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zhinxmin -verify-machineinstrs`
half-bitmanip-dagcombines.8e05dab81b.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -verify-machineinstrs`
half-bitmanip-dagcombines.8fd27dba2a.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zhinxmin -verify-machineinstrs`
half-bitmanip-dagcombines.a96ee35498.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -target-abi lp64 -verify-machineinstrs`
half-bitmanip-dagcombines.b017c16cbf.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zhinx -verify-machineinstrs`
half-bitmanip-dagcombines.b7ffc651cf.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv32 -target-abi ilp32 -mattr=+zhinxmin -verify-machineinstrs`
half-bitmanip-dagcombines.d0145eb655.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -verify-machineinstrs`
half-bitmanip-dagcombines.db0d99abc4.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -target-abi lp64 -mattr=+zfhmin -verify-machineinstrs`
half-bitmanip-dagcombines.f3984c5105.ll (mutant of half-bitmanip-dagcombines.ll)	fabs	`-mtriple=riscv64 -target-abi lp64 -verify-machineinstrs`
half-intrinsics.00f1b8f1a4.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.285ee03400.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.2ab925da48.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.3747d621eb.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.4434d42d83.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.48be7a4851.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.a46c2526dc.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.d08d49a6a3.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.d29128346f.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.de8d0c59eb.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.e293447060.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.e8f8af706b.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.f00db8918e.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.ff85a3dda2.ll (mutant of half-intrinsics.ll)	fabs_f16	`-mtriple=riscv32 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.