derek.holloway
7502bf64a4
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36 lines
801 B
LLVM
36 lines
801 B
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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; extern int foo(void) __attribute__((bpf_fastcall));
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;
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; int bar(int a, int b, int c, int d, int e) {
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; foo();
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; return e;
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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 W1-W5.
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define dso_local i32 @bar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
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entry:
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%call = tail call i32 @foo() #0
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ret i32 %e
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}
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; CHECK: # %bb.0:
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; CHECK-NEXT: *(u64 *)(r10 - 8) = r5
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; CHECK-NEXT: call foo
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; CHECK-NEXT: r5 = *(u64 *)(r10 - 8)
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; CHECK-NEXT: w0 = w5
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; CHECK-NEXT: exit
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declare dso_local i32 @foo() #0
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attributes #0 = { "bpf_fastcall" }
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