derek.holloway
7502bf64a4
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63 lines
1.6 KiB
LLVM
63 lines
1.6 KiB
LLVM
; RUN: llc -O2 --mtriple=bpfel %s -o - | FileCheck %s
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; Generated from the following C code:
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;
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; #define __bpf_fastcall __attribute__((bpf_fastcall))
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;
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; void quux(void *);
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; void bar(long) __bpf_fastcall;
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; void buz(long i, long j);
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;
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; void foo(long i, long j) {
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; long k;
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; bar(i);
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; bar(i);
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; buz(i, j);
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; quux(&k);
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; }
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;
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; Using the following command:
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;
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; clang --target=bpf -emit-llvm -O2 -S -o - t.c
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;
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; (unnecessary attrs removed maually)
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; Check that function marked with bpf_fastcall does not clobber R1-R5.
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; Check that spills/fills wrapping the call use and reuse lowest stack offsets.
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define dso_local void @foo(i64 noundef %i, i64 noundef %j) {
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entry:
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%k = alloca i64, align 8
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tail call void @bar(i64 noundef %i) #0
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tail call void @bar(i64 noundef %i) #0
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tail call void @buz(i64 noundef %i, i64 noundef %j)
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call void @quux(ptr noundef nonnull %k)
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ret void
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}
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; CHECK: # %bb.0:
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; CHECK-NEXT: r3 = r1
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; CHECK-NEXT: *(u64 *)(r10 - 16) = r2
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; CHECK-NEXT: *(u64 *)(r10 - 24) = r3
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; CHECK-NEXT: call bar
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; CHECK-NEXT: r3 = *(u64 *)(r10 - 24)
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; CHECK-NEXT: r2 = *(u64 *)(r10 - 16)
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; CHECK-NEXT: r1 = r3
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; CHECK-NEXT: *(u64 *)(r10 - 16) = r2
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; CHECK-NEXT: *(u64 *)(r10 - 24) = r3
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; CHECK-NEXT: call bar
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; CHECK-NEXT: r3 = *(u64 *)(r10 - 24)
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; CHECK-NEXT: r2 = *(u64 *)(r10 - 16)
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; CHECK-NEXT: r1 = r3
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; CHECK-NEXT: call buz
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; CHECK-NEXT: r1 = r10
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; CHECK-NEXT: r1 += -8
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; CHECK-NEXT: call quux
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; CHECK-NEXT: exit
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declare dso_local void @bar(i64 noundef) #0
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declare dso_local void @buz(i64 noundef, i64 noundef)
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declare dso_local void @quux(ptr noundef)
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attributes #0 = { "bpf_fastcall" }
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