File: xadd_legal.ll

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llvm-toolchain-19 1%3A19.1.7-3
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; 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
}