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Add missing test for the "Don't delete empty preheaders" added in r265397

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Author: Tom Jablin (tjablin)
llvm-svn: 265402
This commit is contained in:
Chuang-Yu Cheng 2016-04-05 14:21:32 +00:00
parent 30e71849e1
commit 27fda4cfaf
1 changed files with 39 additions and 0 deletions
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39
test/CodeGen/Generic/dont-remove-empty-preheader.ll Normal file
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; RUN: opt -codegenprepare -S < %s | FileCheck %s
; CHECK: for.body.preheader
@N = common global i32 0, align 4
@E = common global i8** null, align 8
@B = common global i8** null, align 8
; Function Attrs: nounwind
define i32 @foo() {
entry:
%0 = load i32, i32* @N, align 4
%1 = load i8**, i8*** @E, align 8
%2 = load i8**, i8*** @B, align 8
%cmp7 = icmp eq i8** %2, %1
br i1 %cmp7, label %for.cond.cleanup, label %for.body.preheader
for.body.preheader: ; preds = %entry
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.body
%add.lcssa = phi i32 [ %add, %for.body ]
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
%n.0.lcssa = phi i32 [ %0, %entry ], [ %add.lcssa, %for.cond.cleanup.loopexit ]
ret i32 %n.0.lcssa
for.body: ; preds = %for.body.preheader, %for.body
%I.09 = phi i8** [ %incdec.ptr, %for.body ], [ %2, %for.body.preheader ]
%n.08 = phi i32 [ %add, %for.body ], [ %0, %for.body.preheader ]
%3 = load i8*, i8** %I.09, align 8
%call = tail call i32 @map(i8* %3)
%add = add nsw i32 %call, %n.08
%incdec.ptr = getelementptr inbounds i8*, i8** %I.09, i64 1
%cmp = icmp eq i8** %incdec.ptr, %1
br i1 %cmp, label %for.cond.cleanup.loopexit, label %for.body
}
declare i32 @map(i8*)