File: readcyclecounter.ll

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-6~deb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,418,812 kB
  • sloc: cpp: 5,290,827; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,900; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,892; xml: 953; cs: 573; fortran: 539
file content (24 lines) | stat: -rw-r--r-- 924 bytes parent folder | download | duplicates (20) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
; RUN: llc -mtriple=armv7-none-linux-gnueabi < %s | FileCheck %s
; RUN: llc -mtriple=thumbv7-none-linux-gnueabi < %s | FileCheck %s
; RUN: llc -mtriple=armv7-none-linux-gnueabi -mattr=-perfmon < %s | FileCheck %s --check-prefix=CHECK-NO-PERFMON
; RUN: llc -mtriple=armv6-none-linux-gnueabi < %s | FileCheck %s --check-prefix=CHECK-NO-PERFMON

; The performance monitor we're looking for is an ARMv7 extension. It should be
; possible to disable it, but realistically present on at least every v7-A
; processor (but not on v6, at least by default).

declare i64 @llvm.readcyclecounter()

define i64 @get_count() {
  %val = call i64 @llvm.readcyclecounter()
  ret i64 %val

  ; As usual, exact registers only sort of matter but the cycle-count had better
  ; end up in r0 in the end.

; CHECK: mrc p15, #0, r0, c9, c13, #0
; CHECK: {{movs?}} r1, #0

; CHECK-NO-PERFMON: {{movs?}} r0, #0
; CHECK-NO-PERFMON: {{movs?}} r1, #0
}