From 4b91c3ac96fd93c7e9794d427787c29c68c25f68 Mon Sep 17 00:00:00 2001 From: Owen Anderson Date: Thu, 16 Sep 2010 17:42:36 +0000 Subject: Fix PR8161, in which an unreachable loop causes recursive instruction simplification to try to replace an instruction with itself. Add a predicate to the simplifier to prevent this case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114097 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/Transforms/CorrelatedValuePropagation/crash.ll | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 test/Transforms/CorrelatedValuePropagation/crash.ll (limited to 'test/Transforms') diff --git a/test/Transforms/CorrelatedValuePropagation/crash.ll b/test/Transforms/CorrelatedValuePropagation/crash.ll new file mode 100644 index 0000000..8636788 --- /dev/null +++ b/test/Transforms/CorrelatedValuePropagation/crash.ll @@ -0,0 +1,20 @@ +; RUN: opt < %s -correlated-propagation + +; PR8161 +define void @test1() nounwind ssp { +entry: + br label %for.end + +for.cond.us.us: ; preds = %for.cond.us.us + %cmp6.i.us.us = icmp sgt i32 1, 0 + %lor.ext.i.us.us = zext i1 %cmp6.i.us.us to i32 + %lor.ext.add.i.us.us = select i1 %cmp6.i.us.us, i32 %lor.ext.i.us.us, i32 undef + %conv.i.us.us = trunc i32 %lor.ext.add.i.us.us to i16 + %sext.us.us = shl i16 %conv.i.us.us, 8 + %conv6.us.us = ashr i16 %sext.us.us, 8 + %and.us.us = and i16 %conv6.us.us, %and.us.us + br i1 false, label %for.end, label %for.cond.us.us + +for.end: ; preds = %for.cond.us, %for.cond.us.us, %entry + ret void +} -- cgit v1.1