File: xadd_legal.ll

package info (click to toggle)
swiftlang 6.1.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,604 kB
  • sloc: cpp: 9,901,740; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (26 lines) | stat: -rw-r--r-- 1,051 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
 
; 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(ptr nocapture %ptr, i64 %a) {
entry:
  %conv = trunc i64 %a to i32
  %0 = atomicrmw add ptr %ptr, i32 %conv seq_cst
; CHECK-64: lock *(u32 *)(r1 + 0) += r2
; CHECK-32: lock *(u32 *)(r1 + 0) += w2
  %1 = load i32, ptr %ptr, align 4
  ret i32 %1
}