File: xadd_legal.ll

package info (click to toggle)
llvm-toolchain-15 1%3A15.0.6-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,554,644 kB
  • sloc: cpp: 5,922,452; ansic: 1,012,136; asm: 674,362; python: 191,568; objc: 73,855; f90: 42,327; lisp: 31,913; pascal: 11,973; javascript: 10,144; sh: 9,421; perl: 7,447; ml: 5,527; awk: 3,523; makefile: 2,520; xml: 885; cs: 573; fortran: 567
file content (26 lines) | stat: -rw-r--r-- 1,054 bytes parent folder | download | duplicates (16) 
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
 
; RUN: llc -march=bpfel < %s 2>&1 | FileCheck --check-prefix=CHECK-64 %s
; RUN: llc -march=bpfeb < %s 2>&1 | FileCheck --check-prefix=CHECK-64 %s
; RUN: llc -march=bpfel -mattr=+alu32 < %s 2>&1 | FileCheck --check-prefix=CHECK-32 %s
; RUN: llc -march=bpfeb -mattr=+alu32 < %s 2>&1 | FileCheck --check-prefix=CHECK-32 %s

; This file is generated with the source command and source
; $ clang -target bpf -O2 -S -emit-llvm t.c
; $ cat t.c
; int test(int *ptr, unsigned long long a) {
;    __sync_fetch_and_add(ptr, a);
;    return *ptr;
; }
;
; NOTE: passing unsigned long long as the second operand of __sync_fetch_and_add
; could effectively create sub-register reference coming from indexing a full
; register which could then exerceise hasLivingDefs inside BPFMIChecker.cpp.

define dso_local i32 @test(i32* nocapture %ptr, i64 %a) {
entry:
  %conv = trunc i64 %a to i32
  %0 = atomicrmw add i32* %ptr, i32 %conv seq_cst
; CHECK-64: lock *(u32 *)(r1 + 0) += r2
; CHECK-32: lock *(u32 *)(r1 + 0) += w2
  %1 = load i32, i32* %ptr, align 4
  ret i32 %1
}