| # 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_]], 4 |
| ; CHECK: %rax = COPY [[SUBREG_TO_REG]] |
| %0(s32) = G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.x86.flags.read.u32) |
| %rax = COPY %0(s32) |
| ... |