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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
70 lines
1.6 KiB
LLVM
70 lines
1.6 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 gbl;
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; int test(int a, int b) {
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; if (a == 2) {
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; gbl = gbl * gbl * 2;
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; goto out;
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; }
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; if (a != b) {
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; gbl = gbl * 4;
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; }
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; out:
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; return gbl;
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; }
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@gbl = common local_unnamed_addr global i32 0, align 4
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define i32 @test(i32, i32) local_unnamed_addr #0 {
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%3 = icmp eq i32 %0, 2
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br i1 %3, label %4, label %8
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; <label>:4: ; preds = %2
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%5 = load i32, i32* @gbl, align 4
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%6 = shl i32 %5, 1
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%7 = mul i32 %6, %5
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br label %13
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; CHECK: r1 <<= 32
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; CHECK: r1 >>= 32
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; CHECK: if r1 != 2 goto +6 <LBB0_2>
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; <label>:8: ; preds = %2
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%9 = icmp eq i32 %0, %1
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%10 = load i32, i32* @gbl, align 4
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br i1 %9, label %15, label %11
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; CHECK: r1 = 0 ll
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; CHECK: r0 = *(u32 *)(r1 + 0)
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; CHECK: r0 *= r0
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; CHECK: r0 <<= 1
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; CHECK: goto +7 <LBB0_4>
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; <label>:11: ; preds = %8
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%12 = shl nsw i32 %10, 2
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br label %13
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; CHECK-LABEL: LBB0_2:
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; CHECK: r3 = 0 ll
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; CHECK: r0 = *(u32 *)(r3 + 0)
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; CHECK: r2 <<= 32
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; CHECK: r2 >>= 32
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; CHECK: if r1 == r2 goto +4 <LBB0_5>
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; CHECK: r0 <<= 2
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; <label>:13: ; preds = %4, %11
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%14 = phi i32 [ %12, %11 ], [ %7, %4 ]
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store i32 %14, i32* @gbl, align 4
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br label %15
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; CHECK-LABEL: LBB0_4:
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; CHECK: r1 = 0 ll
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; CHECK: *(u32 *)(r1 + 0) = r0
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; <label>:15: ; preds = %8, %13
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%16 = phi i32 [ %14, %13 ], [ %10, %8 ]
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ret i32 %16
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; CHECK-LABEL: LBB0_5:
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; CHECK: exit
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}
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attributes #0 = { norecurse nounwind }
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