derek.holloway
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92 lines
2.9 KiB
LLVM
92 lines
2.9 KiB
LLVM
; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t1
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; RUN: llc %t1 -mcpu=v1 -o - | FileCheck -check-prefixes=CHECK %s
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; RUN: opt -O2 -mtriple=bpf-pc-linux -bpf-disable-serialize-icmp %s | llvm-dis > %t1
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; RUN: llc %t1 -mcpu=v1 -o - | FileCheck -check-prefixes=CHECK-DISABLE %s
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;
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; Source:
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; int foo();
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; int bar(int);
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; int test() {
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; int ret = foo();
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; if (ret <= 0)
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; return 0;
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; if (ret > 7)
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; return 0;
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; return bar(ret);
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; }
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; Compilation flag:
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; clang -target bpf -O2 -S -emit-llvm -Xclang -disable-llvm-passes test.c
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; Function Attrs: nounwind
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define dso_local i32 @test() {
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entry:
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%retval = alloca i32, align 4
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%ret = alloca i32, align 4
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%cleanup.dest.slot = alloca i32, align 4
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call void @llvm.lifetime.start.p0(i64 4, ptr %ret)
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%call = call i32 @foo()
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store i32 %call, ptr %ret, align 4, !tbaa !2
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%0 = load i32, ptr %ret, align 4, !tbaa !2
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%cmp = icmp sle i32 %0, 0
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br i1 %cmp, label %if.then, label %if.end
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; CHECK: [[REG1:r[0-9]+]] <<= 32
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; CHECK: [[REG1]] s>>= 32
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; CHECK: [[REG2:r[0-9]+]] = 1
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; CHECK: if [[REG2]] s> [[REG1]] goto
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; CHECK: if [[REG1]] s> 7 goto
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; CHECK-DISABLE: [[REG1:r[0-9]+]] += -8
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; CHECK-DISABLE: [[REG1]] <<= 32
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; CHECK-DISABLE: [[REG1]] >>= 32
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; CHECK-DISABLE: [[REG2:r[0-9]+]] = 4294967289
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; CHECK-DISABLE: if [[REG2]] > [[REG1]] goto
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if.then: ; preds = %entry
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store i32 0, ptr %retval, align 4
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store i32 1, ptr %cleanup.dest.slot, align 4
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br label %cleanup
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if.end: ; preds = %entry
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%1 = load i32, ptr %ret, align 4, !tbaa !2
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%cmp1 = icmp sgt i32 %1, 7
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br i1 %cmp1, label %if.then2, label %if.end3
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if.then2: ; preds = %if.end
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store i32 0, ptr %retval, align 4
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store i32 1, ptr %cleanup.dest.slot, align 4
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br label %cleanup
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if.end3: ; preds = %if.end
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%2 = load i32, ptr %ret, align 4, !tbaa !2
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%call4 = call i32 @bar(i32 %2)
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store i32 %call4, ptr %retval, align 4
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store i32 1, ptr %cleanup.dest.slot, align 4
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br label %cleanup
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cleanup: ; preds = %if.end3, %if.then2, %if.then
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call void @llvm.lifetime.end.p0(i64 4, ptr %ret)
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%3 = load i32, ptr %retval, align 4
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ret i32 %3
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}
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)
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declare dso_local i32 @foo(...)
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declare dso_local i32 @bar(i32)
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)
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!llvm.module.flags = !{!0}
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!llvm.ident = !{!1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git ca9c5433a6c31e372092fcd8bfd0e4fddd7e8784)"}
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!2 = !{!3, !3, i64 0}
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!3 = !{!"int", !4, i64 0}
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!4 = !{!"omnipotent char", !5, i64 0}
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!5 = !{!"Simple C/C++ TBAA"}
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