File: select-intrinsic-x86-flags-read-u32.mir

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-11
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,418,840 kB
  • sloc: cpp: 5,290,826; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,898; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,913; xml: 953; cs: 573; fortran: 539
file content (28 lines) | stat: -rw-r--r-- 817 bytes parent folder | download | duplicates (22) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
 
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=i386-- -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s

# 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.

--- |
  define void @read_flags() { ret void }
  ; CHECK-LABEL: name: read_flags
  ; CHECK: bb.0:
  ; CHECK:   [[RDFLAGS32_:%[0-9]+]]:gr32 = RDFLAGS32 implicit-def $esp, implicit $esp
  ; CHECK:   $eax = COPY [[RDFLAGS32_]]
...

---
name:            read_flags
legalized:       true
regBankSelected: true

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

body:             |
  bb.0:
    %0(s32) = G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.x86.flags.read.u32)
    $eax = COPY %0(s32)
...