fallback: legalize: G

fallback: legalize: G_FEXP s16

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_FEXP s16
Occurrences:	46 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 bc8218b282
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 (46):

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.020679fcb4.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.0241c42d6f.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.035778b016.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.043aae514f.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-intrinsics.0bf99633c3.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.1cd92fd7ef.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.1ec9072e2e.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.21410fa30d.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.2340a4b878.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.36220f8c66.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.3ec84cf1ba.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.4527eb1954.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.493f4e0b24.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.51ee09054d.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.5328cb6896.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.54b9476495.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d`
half-intrinsics.623bf284e7.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.64d398840e.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.65c2f89ef5.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.7c258dd42a.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.8c5d000296.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.90cf749217.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.afb1361608.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.b4204f01ff.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.bac843ed52.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.c2eb3643b2.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.c3258c0446.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.c36aca5a80.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-intrinsics.c909bf7022.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.d0ebb6b476.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d`
half-intrinsics.d35b230278.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.df6fd75e40.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.e4861610fa.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.e8dead9988.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.f071c39a93.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ff2410cf50.ll (mutant of half-intrinsics.ll)	exp_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`

Generated 2026-10-15 08:05 UTC.