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| author | Manman Ren <mren@apple.com> | 2013-01-04 19:19:47 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2013-01-04 19:19:47 +0000 |
| commit | c55bd47105ef8e362cfb2a2c97ee3e23145aca4d (patch) | |
| tree | dcfd58c47215cc7c814d162ce379239be6b1e587 /test | |
| parent | 63723e5bf8bc1e5b699733cb79992b720b20f0d5 (diff) | |
| download | llvm-c55bd47105ef8e362cfb2a2c97ee3e23145aca4d.tar.gz llvm-c55bd47105ef8e362cfb2a2c97ee3e23145aca4d.tar.bz2 llvm-c55bd47105ef8e362cfb2a2c97ee3e23145aca4d.tar.xz | |
Memory Dependence Analysis: fix a miscompile that uses DT to approxmiate the
reachablity.
We conservatively approximate the reachability analysis by saying it is not
reachable if there is a single path starting from "From" and the path does not
reach "To".
rdar://12801584
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171512 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/GVN/MemdepMiscompile.ll | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/test/Transforms/GVN/MemdepMiscompile.ll b/test/Transforms/GVN/MemdepMiscompile.ll new file mode 100644 index 0000000000..d420169615 --- /dev/null +++ b/test/Transforms/GVN/MemdepMiscompile.ll @@ -0,0 +1,54 @@ +; RUN: opt < %s -basicaa -gvn -S | FileCheck %s +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-apple-macosx10.7.0" + +; rdar://12801584 +; Value of %shouldExit can be changed by RunInMode. +; Make sure we do not replace load %shouldExit in while.cond.backedge +; with a phi node where the value from while.body is 0. +define i32 @test() nounwind ssp { +entry: +; CHECK: test() +; CHECK: while.body: +; CHECK: call void @RunInMode +; CHECK: br i1 %tobool, label %while.cond.backedge, label %if.then +; CHECK: while.cond.backedge: +; CHECK: load i32* %shouldExit +; CHECK: br i1 %cmp, label %while.body + %shouldExit = alloca i32, align 4 + %tasksIdle = alloca i32, align 4 + store i32 0, i32* %shouldExit, align 4 + store i32 0, i32* %tasksIdle, align 4 + call void @CTestInitialize(i32* %tasksIdle) nounwind + %0 = load i32* %shouldExit, align 4 + %cmp1 = icmp eq i32 %0, 0 + br i1 %cmp1, label %while.body.lr.ph, label %while.end + +while.body.lr.ph: + br label %while.body + +while.body: + call void @RunInMode(i32 100) nounwind + %1 = load i32* %tasksIdle, align 4 + %tobool = icmp eq i32 %1, 0 + br i1 %tobool, label %while.cond.backedge, label %if.then + +if.then: + store i32 0, i32* %tasksIdle, align 4 + call void @TimerCreate(i32* %shouldExit) nounwind + br label %while.cond.backedge + +while.cond.backedge: + %2 = load i32* %shouldExit, align 4 + %cmp = icmp eq i32 %2, 0 + br i1 %cmp, label %while.body, label %while.cond.while.end_crit_edge + +while.cond.while.end_crit_edge: + br label %while.end + +while.end: + ret i32 0 +} +declare void @CTestInitialize(i32*) +declare void @RunInMode(i32) +declare void @TimerCreate(i32*) |