fallback: legalize: G

fallback: legalize: G_FTAN s16

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_FTAN s16
Occurrences:	28 in 18 configs, 1 test files
Snippet from:	half-intrinsics.ll @tan_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 @tan_f16(half %a) #0 {
  %1 = call half @llvm.tan.f16(half %a)
  ret half %1
}

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

attributes #0 = { nounwind }
attributes #1 = { nocallback 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_FTAN %0:_ (in function: tan_f16)
warning: Instruction selection used fallback path for tan_f16

Occurrences (28):

Input	Function	Config
half-intrinsics.ll	tan_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	tan_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.ll	tan_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	tan_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.ll	tan_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.ll	tan_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	tan_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.ll	tan_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	tan_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-intrinsics.ll	tan_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.151ca6758c.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.1a6682d239.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -verify-machineinstrs`
half-intrinsics.5a9fa08130.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -verify-machineinstrs`
half-intrinsics.6ac2eb161a.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.6e1e240219.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.6e326afd3d.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.7f62cf0501.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi ilp32d`
half-intrinsics.822713be3f.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.856b73fb77.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-intrinsics.93919396b2.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-intrinsics.9dd45a608b.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfhmin -verify-machineinstrs -target-abi lp64d`
half-intrinsics.9f935932fa.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -mattr=+zdinx -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.a441a118b4.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -mattr=+d -mattr=+zfh -verify-machineinstrs -target-abi lp64d`
half-intrinsics.b74b81c1b8.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-intrinsics.d160fd5e47.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -mattr=+zdinx -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-intrinsics.d2c8394538.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-intrinsics.dc83a46f11.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f`
half-intrinsics.f0947699ca.ll (mutant of half-intrinsics.ll)	tan_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`

Generated 2026-10-15 08:05 UTC.