fallback: legalize: G_RESET

fallback: legalize: G_RESET_FPMODE

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_RESET_FPMODE
Occurrences:	12 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 04ca53e65f
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 (12):

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.0c5db01714.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs`
fpenv-xlen.435934ffd6.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.8803ad32e5.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.e7b486cde1.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.fa7d895832.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`
fpenv-xlen.fc2028787d.ll (mutant of fpenv-xlen.ll)	func_reset_fpmode	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -O0`

Generated 2026-10-15 08:05 UTC.