File: bpf-inline-asm.c

package info (click to toggle)
llvm-toolchain-16 1%3A16.0.6-15~deb11u2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,634,820 kB
  • sloc: cpp: 6,179,261; ansic: 1,216,205; asm: 741,319; python: 196,614; objc: 75,325; f90: 49,640; lisp: 32,396; pascal: 12,286; sh: 9,394; perl: 7,442; ml: 5,494; awk: 3,523; makefile: 2,723; javascript: 1,206; xml: 886; fortran: 581; cs: 573
file content (31 lines) | stat: -rw-r--r-- 974 bytes parent folder | download | duplicates (12) 
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
29
30
31
 
// REQUIRES: bpf-registered-target
// RUN: %clang_cc1 -triple bpf -emit-llvm -target-feature +alu32 %s -o - | FileCheck %s
// RUN: %clang_cc1 -triple bpf -emit-llvm -target-cpu v3 %s -o - | FileCheck %s

void test_generic_constraints(int var32, long var64) {
  asm("%0 = %1"
      : "=r"(var32)
      : "0"(var32));
  // CHECK: [[R32_ARG:%[a-zA-Z0-9]+]] = load i32, ptr
  // CHECK: call i32 asm "$0 = $1", "=r,0"(i32 [[R32_ARG]])

  asm("%0 = %1"
      : "=r"(var64)
      : "0"(var64));
  // CHECK: [[R64_ARG:%[a-zA-Z0-9]+]] = load i64, ptr
  // CHECK: call i64 asm "$0 = $1", "=r,0"(i64 [[R64_ARG]])

  asm("%0 = %1"
      : "=r"(var64)
      : "r"(var64));
  // CHECK: [[R64_ARG:%[a-zA-Z0-9]+]] = load i64, ptr
  // CHECK: call i64 asm "$0 = $1", "=r,r"(i64 [[R64_ARG]])
}

void test_constraint_w(int a) {
  asm("%0 = %1"
      : "=w"(a)
      : "w"(a));
  // CHECK: [[R32_ARG:%[a-zA-Z0-9]+]] = load i32, ptr
  // CHECK: call i32 asm "$0 = $1", "=w,w"(i32 [[R32_ARG]])
}