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e8b3966318
Currently, it prints the backward branch offset as unsigned value
like below:
7: 7d 34 0b 00 00 00 00 00 if r4 s>= r3 goto 11 <LBB0_3>
8: b7 00 00 00 00 00 00 00 r0 = 0
LBB0_2:
9: 07 00 00 00 01 00 00 00 r0 += 1
......
17: bf 31 00 00 00 00 00 00 r1 = r3
18: 6d 32 f6 ff 00 00 00 00 if r2 s> r3 goto 65526 <LBB0_3+0x7FFB0>
The correct print insn 18 should be:
18: 6d 32 f6 ff 00 00 00 00 if r2 s> r3 goto -10 <LBB0_2>
To provide better clarity and be consistent with kernel verifier output,
the insn 7 output is changed to the following with "+" added to
non-negative branch offset:
7: 7d 34 0b 00 00 00 00 00 if r4 s>= r3 goto +11 <LBB0_3>
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
llvm-svn: 318442
40 lines
1.1 KiB
LLVM
40 lines
1.1 KiB
LLVM
; RUN: llc -march=bpfel -filetype=obj -o - %s | llvm-objdump -d - | FileCheck %s
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; Source Code:
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; int test(int a, int b) {
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; int s = 0;
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; while (a < b) { s++; a += s; b -= s; }
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; return s;
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; }
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define i32 @test(i32, i32) local_unnamed_addr #0 {
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; CHECK-LABEL: test:
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%3 = icmp slt i32 %0, %1
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br i1 %3, label %4, label %13
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; <label>:4: ; preds = %2
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br label %5
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; CHECK: if r4 s>= r3 goto +11 <LBB0_3>
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; CHECK: r0 = 0
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; CHECK-LABEL: LBB0_2:
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; <label>:5: ; preds = %4, %5
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%6 = phi i32 [ %9, %5 ], [ 0, %4 ]
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%7 = phi i32 [ %11, %5 ], [ %1, %4 ]
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%8 = phi i32 [ %10, %5 ], [ %0, %4 ]
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%9 = add nuw nsw i32 %6, 1
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%10 = add nsw i32 %9, %8
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%11 = sub nsw i32 %7, %9
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%12 = icmp slt i32 %10, %11
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br i1 %12, label %5, label %13
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; CHECK: r1 = r3
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; CHECK: if r2 s> r3 goto -10 <LBB0_2>
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; <label>:13: ; preds = %5, %2
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%14 = phi i32 [ 0, %2 ], [ %9, %5 ]
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ret i32 %14
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; CHECK-LABEL: LBB0_3:
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; CHECK: exit
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}
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attributes #0 = { norecurse nounwind readnone }
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