derek.holloway
7502bf64a4
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57 lines
1.3 KiB
LLVM
57 lines
1.3 KiB
LLVM
; RUN: llc < %s -mtriple=bpf -verify-machineinstrs | FileCheck %s
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; Source code:
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;struct __sk_buff;
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;unsigned long long
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;load_byte(ptr skb, unsigned long long off) asm("llvm.bpf.load.byte");
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;unsigned long long
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;load_half(ptr skb, unsigned long long off) asm("llvm.bpf.load.half");
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;typedef unsigned char uint8_t;
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;typedef unsigned short uint16_t;
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;
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;int func_b(struct __sk_buff *skb)
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;{
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; uint8_t t = load_byte(skb, 0);
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; return t;
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;}
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;
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;int func_h(struct __sk_buff *skb)
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;{
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; uint16_t t = load_half(skb, 0);
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; return t;
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;}
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;
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;int func_w(struct __sk_buff *skb)
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;{
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; uint32_t t = load_word(skb, 0);
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; return t;
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;}
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%struct.__sk_buff = type opaque
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; Function Attrs: nounwind readonly
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define i32 @func_b(ptr %skb) local_unnamed_addr #0 {
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entry:
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%call = tail call i64 @llvm.bpf.load.byte(ptr %skb, i64 0)
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%conv = trunc i64 %call to i32
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%conv1 = and i32 %conv, 255
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; CHECK-NOT: r0 &= 255
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ret i32 %conv1
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}
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; Function Attrs: nounwind readonly
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declare i64 @llvm.bpf.load.byte(ptr, i64) #1
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; Function Attrs: nounwind readonly
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define i32 @func_h(ptr %skb) local_unnamed_addr #0 {
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entry:
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%call = tail call i64 @llvm.bpf.load.half(ptr %skb, i64 0)
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%conv = trunc i64 %call to i32
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%conv1 = and i32 %conv, 65535
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; CHECK-NOT: r0 &= 65535
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ret i32 %conv1
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}
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; Function Attrs: nounwind readonly
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declare i64 @llvm.bpf.load.half(ptr, i64) #1
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