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| author | Chris Lattner <sabre@nondot.org> | 2008-06-25 05:59:28 +0000 |
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| committer | Chris Lattner <sabre@nondot.org> | 2008-06-25 05:59:28 +0000 |
| commit | aa0bf52625447ec3ce29c94393f946c58475aa60 (patch) | |
| tree | 77bb839581c40e0413b2039d3a0b2356a3f19a8c /test | |
| parent | 601ca4b434f5c67503a30575cc36b688b0d959e6 (diff) | |
| download | external_llvm-aa0bf52625447ec3ce29c94393f946c58475aa60.zip external_llvm-aa0bf52625447ec3ce29c94393f946c58475aa60.tar.gz external_llvm-aa0bf52625447ec3ce29c94393f946c58475aa60.tar.bz2 | |
Fix PR2488, a case where we deleted stack restores too aggressively.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52702 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/InstCombine/2008-06-24-StackRestore.ll | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/2008-06-24-StackRestore.ll b/test/Transforms/InstCombine/2008-06-24-StackRestore.ll new file mode 100644 index 0000000..9ed7be3 --- /dev/null +++ b/test/Transforms/InstCombine/2008-06-24-StackRestore.ll @@ -0,0 +1,39 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {call.*llvm.stackrestore} +; PR2488 +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32" +target triple = "i386-pc-linux-gnu" +@p = weak global i8* null ; <i8**> [#uses=2] + +define i32 @main() nounwind { +entry: + %tmp248 = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1] + %tmp2752 = alloca i32 ; <i32*> [#uses=2] + %tmpcast53 = bitcast i32* %tmp2752 to i8* ; <i8*> [#uses=1] + store i32 2, i32* %tmp2752, align 4 + volatile store i8* %tmpcast53, i8** @p, align 4 + br label %bb44 + +bb: ; preds = %bb44 + ret i32 0 + +bb44: ; preds = %bb44, %entry + %indvar = phi i32 [ 0, %entry ], [ %tmp3857, %bb44 ] ; <i32> [#uses=1] + %tmp249 = phi i8* [ %tmp248, %entry ], [ %tmp2, %bb44 ] ; <i8*> [#uses=1] + %tmp3857 = add i32 %indvar, 1 ; <i32> [#uses=3] + call void @llvm.stackrestore( i8* %tmp249 ) + %tmp2 = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1] + %tmp4 = srem i32 %tmp3857, 1000 ; <i32> [#uses=2] + %tmp5 = add i32 %tmp4, 1 ; <i32> [#uses=1] + %tmp27 = alloca i32, i32 %tmp5 ; <i32*> [#uses=3] + %tmpcast = bitcast i32* %tmp27 to i8* ; <i8*> [#uses=1] + store i32 1, i32* %tmp27, align 4 + %tmp34 = getelementptr i32* %tmp27, i32 %tmp4 ; <i32*> [#uses=1] + store i32 2, i32* %tmp34, align 4 + volatile store i8* %tmpcast, i8** @p, align 4 + %exitcond = icmp eq i32 %tmp3857, 999999 ; <i1> [#uses=1] + br i1 %exitcond, label %bb, label %bb44 +} + +declare i8* @llvm.stacksave() nounwind + +declare void @llvm.stackrestore(i8*) nounwind |