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

package info (click to toggle)
llvm-toolchain-21 1%3A21.1.6-3
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,245,028 kB
  • sloc: cpp: 7,619,726; ansic: 1,434,018; asm: 1,058,748; python: 252,740; f90: 94,671; objc: 70,685; lisp: 42,813; pascal: 18,401; sh: 8,601; ml: 5,111; perl: 4,720; makefile: 3,675; awk: 3,523; javascript: 2,409; xml: 892; fortran: 770
file content (28 lines) | stat: -rw-r--r-- 822 bytes parent folder | download | duplicates (5) 
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 dead $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)
...