fallback: legalize: G_GET

fallback: legalize: G_GET_FPENV s64

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_GET_FPENV s64
Occurrences:	12 in 3 configs, 1 test files
Snippet from:	fpenv-xlen.ll @func_get_fpenv via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define i64 @func_get_fpenv() {
entry:
  %fpenv = call i64 @llvm.get.fpenv.i64()
  ret i64 %fpenv
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite)
declare i64 @llvm.get.fpenv.i64() #0

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

Reproduce:

llc -mtriple=riscv64 -mattr=+f -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+f -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %0:_(s64) = G_GET_FPENV (in function: func_get_fpenv)
warning: Instruction selection used fallback path for func_get_fpenv

Occurrences (12):

Input	Function	Config
fpenv-xlen.ll	func_get_fpenv	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`
fpenv-xlen.ll	func_get_fpenv	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.ll	func_get_fpenv	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.435934ffd6.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.575414d849.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`
fpenv-xlen.906fbff5ac.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.9b1404fba3.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.bfcb7d5eb6.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.c2cec2d567.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`
fpenv-xlen.e7b486cde1.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fpenv-xlen.eda9803f93.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -O0`
fpenv-xlen.fa7d895832.ll (mutant of fpenv-xlen.ll)	func_get_fpenv	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.