fallback: legalize: G

fallback: legalize: G_FEXP s16

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_FEXP s16
Occurrences:	28 in 18 configs, 1 test files
Snippet from:	half-intrinsics.ll @exp_f16 via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define half @exp_f16(half %a) #0 {
  %1 = call half @llvm.exp.f16(half %a)
  ret half %1
}

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

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

Reproduce:

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

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %1:_(s16) = G_FEXP %0:_ (in function: exp_f16)
warning: Instruction selection used fallback path for exp_f16

Occurrences (28):

Input	Function	Config
half-intrinsics.ll	exp_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	exp_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	exp_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	exp_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	exp_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.ll	exp_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	exp_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	exp_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	exp_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	exp_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.03dcaf184b.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.0cb049a83b.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-intrinsics.22e4c28956.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.42b5f4a831.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.4589c071bd.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.7a2ac24f61.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.8b295a7eff.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d`
half-intrinsics.93873a3bdd.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.a089616e2f.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.aabf7b5d38.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.c143c797a3.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.c214ccb865.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.c564a3f85e.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.cbf15ec5c8.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.e6109b95c5.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.efaa3c5f9f.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.f76d826a47.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.f99f8c4b81.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`

Generated 2026-10-15 08:05 UTC.