# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=i386-- -run-pass=instruction-select -verify-machineinstrs -global-isel %s -o - | FileCheck %s

--- |
  define void @read_flags() { ret void }
...

---
# Check that we select a the x86.flags.read.u32 intrinsic into a RDFLAGS
# instruction. Also check that we constrain the register class of the COPY to
# gr32.
name:            read_flags
legalized:       true
regBankSelected: true

registers:
  - { id: 0, class: gpr }

body:             |
  bb.0:
    ; CHECK-LABEL: name: read_flags
    ; CHECK: [[RDFLAGS32_:%[0-9]+]]:gr32 = RDFLAGS32 implicit-def %esp, implicit %esp
    ; CHECK: [[SUBREG_TO_REG:%[0-9]+]]:gr64 = SUBREG_TO_REG 0, [[RDFLAGS32_]], %subreg.sub_32bit
    ; CHECK: %rax = COPY [[SUBREG_TO_REG]]
    %0(s32) = G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.x86.flags.read.u32)
    %rax = COPY %0(s32)
...