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| author | Nick Lewycky <nicholas@mxc.ca> | 2012-01-23 00:05:17 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2012-01-23 00:05:17 +0000 |
| commit | 37abc488a0527bb682af5aa6c4f376b5b99d67e4 (patch) | |
| tree | 13d1df3a5e17ba9f525ed60688ff0a9c4d9692d4 /test/Transforms | |
| parent | 1906d32e55224b7481cd9e5726bd5e14b55f5cc1 (diff) | |
| download | external_llvm-37abc488a0527bb682af5aa6c4f376b5b99d67e4.zip external_llvm-37abc488a0527bb682af5aa6c4f376b5b99d67e4.tar.gz external_llvm-37abc488a0527bb682af5aa6c4f376b5b99d67e4.tar.bz2 | |
Make Value::isDereferenceablePointer() handle unreachable code blocks. (This
returns false in the event the computation feeding into the pointer is
unreachable, which maybe ought to be true -- but this is at least consistent
with undef->isDereferenceablePointer().) Fixes PR11825!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148671 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/SimplifyCFG/unreachable-blocks.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/unreachable-blocks.ll b/test/Transforms/SimplifyCFG/unreachable-blocks.ll new file mode 100644 index 0000000..1df0eab --- /dev/null +++ b/test/Transforms/SimplifyCFG/unreachable-blocks.ll @@ -0,0 +1,28 @@ +; RUN: opt -simplifycfg < %s -disable-output + +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" +target triple = "x86_64-pc-linux-gnu" + +; PR11825 +define void @test1() { +entry: + br label %return + +while_block: ; preds = %and_if_cont2, %and_if_cont + %newlen = sub i32 %newlen, 1 + %newptr = getelementptr i8* %newptr, i64 1 + %test = icmp sgt i32 %newlen, 0 + br i1 %test, label %and_if1, label %and_if_cont2 + +and_if1: ; preds = %while_block + %char = load i8* %newptr + %test2 = icmp ule i8 %char, 32 + br label %and_if_cont2 + +and_if_cont2: ; preds = %and_if1, %while_block + %a18 = phi i1 [ %test, %while_block ], [ %test2, %and_if1 ] + br i1 %a18, label %while_block, label %return + +return: ; preds = %and_if_cont2, %and_if_cont + ret void +} |