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