fallback: legalize: G_RESET

fallback: legalize: G_RESET_FPMODE

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_RESET_FPMODE
Occurrences:	18 in 6 configs, 1 test files
Snippet from:	fpenv-xlen.ll @func_reset_fpmode via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define void @func_reset_fpmode() {
entry:
  call void @llvm.reset.fpmode()
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite)
declare void @llvm.reset.fpmode() #0

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite) }

Reproduce:

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

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: G_RESET_FPMODE (in function: func_reset_fpmode)
warning: Instruction selection used fallback path for func_reset_fpmode

Occurrences (18):

Input	Function	Config
fpenv-xlen.ll	func_reset_fpmode	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs`
fpenv-xlen.ll	func_reset_fpmode	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.ll	func_reset_fpmode	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.ll	func_reset_fpmode	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`
fpenv-xlen.ll	func_reset_fpmode	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.ll	func_reset_fpmode	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.0d596724a2.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.2dacc3b78e.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`
fpenv-xlen.314df836af.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.544e288230.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs`
fpenv-xlen.6102b94db7.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs`
fpenv-xlen.615598dcea.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.62acf4dc83.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.73e91f94c7.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.84b0f62817.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.e075f4cc2b.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.e58a9e04ff.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.f645565e15.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.