forked from OSchip/llvm-project
56 lines
1.4 KiB
LLVM
56 lines
1.4 KiB
LLVM
; RUN: llc < %s -march=bpf -mattr=+alu32 -verify-machineinstrs | FileCheck %s
|
|
;
|
|
; Source:
|
|
; struct __sk_buff {
|
|
; unsigned data;
|
|
; unsigned data_end;
|
|
; };
|
|
;
|
|
; void * test(int flag, struct __sk_buff *skb)
|
|
; {
|
|
; void *p;
|
|
;
|
|
; if (flag) {
|
|
; p = (void *)(long)skb->data;
|
|
; __asm__ __volatile__("": : :"memory");
|
|
; } else {
|
|
; p = (void *)(long)skb->data_end;
|
|
; __asm__ __volatile__("": : :"memory");
|
|
; }
|
|
;
|
|
; return p;
|
|
; }
|
|
; Compilation flag:
|
|
; clang -target bpf -O2 -S -emit-llvm t.c
|
|
|
|
%struct.__sk_buff = type { i32, i32 }
|
|
|
|
define dso_local i8* @test(i32 %flag, %struct.__sk_buff* nocapture readonly %skb) local_unnamed_addr {
|
|
entry:
|
|
%tobool = icmp eq i32 %flag, 0
|
|
br i1 %tobool, label %if.else, label %if.then
|
|
|
|
if.then:
|
|
%data = getelementptr inbounds %struct.__sk_buff, %struct.__sk_buff* %skb, i64 0, i32 0
|
|
%0 = load i32, i32* %data, align 4
|
|
tail call void asm sideeffect "", "~{memory}"()
|
|
br label %if.end
|
|
|
|
if.else:
|
|
%data_end = getelementptr inbounds %struct.__sk_buff, %struct.__sk_buff* %skb, i64 0, i32 1
|
|
%1 = load i32, i32* %data_end, align 4
|
|
tail call void asm sideeffect "", "~{memory}"()
|
|
br label %if.end
|
|
|
|
if.end:
|
|
%p.0.in.in = phi i32 [ %0, %if.then ], [ %1, %if.else ]
|
|
%p.0.in = zext i32 %p.0.in.in to i64
|
|
%p.0 = inttoptr i64 %p.0.in to i8*
|
|
ret i8* %p.0
|
|
}
|
|
|
|
; CHECK: w0 = *(u32 *)(r2 + 0)
|
|
; CHECK: w0 = *(u32 *)(r2 + 4)
|
|
; CHECK-NOT: r[[#]] = w[[#]]
|
|
; CHECK: exit
|