From 6ff645bf0fcfc0c62e9d9126e1243ec8bf10abbc Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Mon, 19 Jan 2009 23:03:13 +0000 Subject: Fix a problem exposed by PR3354: simplifycfg was making a potentially trapping instruction be executed unconditionally. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62541 91177308-0d34-0410-b5e6-96231b3b80d8 --- .../2009-01-19-UnconditionalTrappingConstantExpr.ll | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 test/Transforms/SimplifyCFG/2009-01-19-UnconditionalTrappingConstantExpr.ll (limited to 'test/Transforms/SimplifyCFG') diff --git a/test/Transforms/SimplifyCFG/2009-01-19-UnconditionalTrappingConstantExpr.ll b/test/Transforms/SimplifyCFG/2009-01-19-UnconditionalTrappingConstantExpr.ll new file mode 100644 index 0000000000..0bc6bdb895 --- /dev/null +++ b/test/Transforms/SimplifyCFG/2009-01-19-UnconditionalTrappingConstantExpr.ll @@ -0,0 +1,20 @@ +; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | grep {br i1 } | count 2 +; PR3354 +; Do not merge bb1 into the entry block, it might trap. + +@G = extern_weak global i32 + +define i32 @test(i32 %tmp21, i32 %tmp24) { + %tmp25 = icmp sle i32 %tmp21, %tmp24 + br i1 %tmp25, label %bb2, label %bb1 + +bb1: ; preds = %bb + %tmp26 = icmp sgt i32 sdiv (i32 -32768, i32 ptrtoint (i32* @G to i32)), 0 + br i1 %tmp26, label %bb6, label %bb2 +bb2: + ret i32 42 + +bb6: + unwind +} + -- cgit v1.2.3