| ; RUN: llc -O2 --mtriple=bpfel %s -o - | FileCheck %s |
| |
| ; Generated from the following C code: |
| ; |
| ; extern int foo(void) __attribute__((bpf_fastcall)); |
| ; |
| ; int bar(int a) { |
| ; foo(); |
| ; return a; |
| ; } |
| ; |
| ; Using the following command: |
| ; |
| ; clang --target=bpf -emit-llvm -O2 -S -o - t.c |
| ; |
| ; (unnecessary attrs removed maually) |
| |
| ; Check that function marked with bpf_fastcall does not clobber W1-W5. |
| |
| define dso_local i32 @bar(i32 %a) { |
| entry: |
| %call = tail call i32 @foo() #0 |
| ret i32 %a |
| } |
| |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: *(u64 *)(r10 - 8) = r1 |
| ; CHECK-NEXT: call foo |
| ; CHECK-NEXT: r1 = *(u64 *)(r10 - 8) |
| ; CHECK-NEXT: w0 = w1 |
| ; CHECK-NEXT: exit |
| |
| declare dso_local i32 @foo() #0 |
| |
| attributes #0 = { "bpf_fastcall" } |
