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[DebugInfo][GVNSink] Fix #77415: GVNSink fails to optimize LLVM IR with debug info #77602

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Merged
merged 5 commits into from
May 20, 2024
Merged

[DebugInfo][GVNSink] Fix #77415: GVNSink fails to optimize LLVM IR with debug info #77602

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114218d
[GVNSink] Fix #77415: GVNSink fails to optimize LLVM IR with debug info
Apochens Jan 10, 2024
78e8257
[GVNSink] Fix #77415: Remove redundant metadata
Apochens Jan 10, 2024
0ea7153
[GVNSink] Fix #77415: Fix metadata
Apochens Jan 10, 2024
39e5902
refine checks in the test
Apochens May 16, 2024
131405f
test nit
Apochens May 17, 2024
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8 changes: 5 additions & 3 deletions llvm/test/Transforms/GVNSink/sink-ignore-dbg-intrinsics.ll
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
; RUN: opt < %s -passes=gvn-sink -S | FileCheck %s

; Test that GVNSink correctly performs the sink optimization in the presence of debug information

; Function Attrs: noinline nounwind uwtable
define dso_local i32 @fun(i32 noundef %a, i32 noundef %b) #0 !dbg !10 {
entry:
Expand All @@ -25,9 +27,9 @@ if.else: ; preds = %entry
br label %if.end

; CHECK-LABEL: if.end:
; CHECK: [[SINK:%.*.sink]] = phi i32 [ %a, %if.then ], [ %b, %if.else ]
; CHECK: %add = add nsw i32 [[SINK]], 1
; CHECK: %xor = xor i32 %add, 1
; CHECK: [[SINK:%.*sink]] = phi i32 [ {{.*}} ], [ {{.*}} ]
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nit: we should have a fixed order here.
maybe swap the PHI operands and see if that passed the check.

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or better use the llvm-project/llvm/utils/update_test_checks.py to update the test

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Thanks! Now the incoming blocks has a fixed order.

; CHECK: [[ADD:%.*]] = add nsw i32 [[SINK]], 1
; CHECK: [[XOR:%.*]] = xor i32 [[ADD]], 1
if.end: ; preds = %if.else, %if.then
%ret.0 = phi i32 [ %xor, %if.then ], [ %xor2, %if.else ], !dbg !35
tail call void @llvm.dbg.value(metadata i32 %ret.0, metadata !27, metadata !DIExpression()), !dbg !16
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