http://llvm.org/bugs/show_bug.cgi?id=17070
Bug ID: 17070
Summary: inline function seems generating wrong code
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11135
--> http://llvm.org/bugs/attachment.cgi?id=11135&action=edit
The preprocessed source & llvm IR source
The generated IR of heapSort is wrong in this line:
the inline function swap
swap(start[endIndex], start[0]);
the llvm code looks like this:
define linkonce_odr hidden void
@_ZN3WTF8heapSortIPNS_6OwnPtrIN7WebCore13MediaQueryExpEEEPFbRKS4_S7_EEEvT_SA_T0_(%"class.WTF::OwnPtr.1"*
%start, %"class.WTF::OwnPtr.1"* %end, i1 (%"class.WTF::OwnPtr.1"*,
%"class.WTF::OwnPtr.1"*)* nocapture %compareLess) #0 {
...
.lr.ph: ; preds =
%_ZN3WTF7heapifyIPNS_6OwnPtrIN7WebCore13MediaQueryExpEEEPFbRKS4_S7_EEEvT_iT0_.exit.preheader
%34 = getelementptr inbounds %"class.WTF::OwnPtr.1"* %start, i32 0, i32 0
br label %35
; <label>:35 ; preds = %.lr.ph,
%_ZN3WTF7heapifyIPNS_6OwnPtrIN7WebCore13MediaQueryExpEEEPFbRKS4_S7_EEEvT_iT0_.exit.backedge
%endIndex.04 = phi i32 [ %endIndex.02.pre-phi, %.lr.ph ], [ %endIndex.0,
%_ZN3WTF7heapifyIPNS_6OwnPtrIN7WebCore13MediaQueryExpEEEPFbRKS4_S7_EEEvT_iT0_.exit.backedge
]
%endIndex.0.in3 = phi i32 [ %4, %.lr.ph ], [ %endIndex.04,
%_ZN3WTF7heapifyIPNS_6OwnPtrIN7WebCore13MediaQueryExpEEEPFbRKS4_S7_EEEvT_iT0_.exit.backedge
]
%36 = getelementptr inbounds %"class.WTF::OwnPtr.1"* %start, i32
%endIndex.04, i32 0
%37 = load %"class.WebCore::MediaQueryExp"** %36, align 4, !tbaa !3
store %"class.WebCore::MediaQueryExp"* %37, %"class.WebCore::MediaQueryExp"**
%34, align 4, !tbaa !3
%38 = add nsw i32 %endIndex.0.in3, -2
%39 = icmp slt i32 %38, 1
br i1 %39, label
%_ZN3WTF7heapifyIPNS_6OwnPtrIN7WebCore13MediaQueryExpEEEPFbRKS4_S7_EEEvT_iT0_.exit.backedge,
label %.lr.ph.i1
As you can see swap function involve two load insts and two store insts,but
just one of them is generated.Please check this bug.
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