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| author | Dan Gohman <gohman@apple.com> | 2010-11-18 17:05:13 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-11-18 17:05:13 +0000 |
| commit | ce562622118c40d5a24a07960c15cd4912db0cbf (patch) | |
| tree | 8a02382febb13bb780009a59d72f39f97f7d73a2 /test/Transforms/GVN/phi-translate.ll | |
| parent | d528be6636539567194981a8c0f8b90220bec0a5 (diff) | |
| download | external_llvm-ce562622118c40d5a24a07960c15cd4912db0cbf.zip external_llvm-ce562622118c40d5a24a07960c15cd4912db0cbf.tar.gz external_llvm-ce562622118c40d5a24a07960c15cd4912db0cbf.tar.bz2 | |
Add support for PHI-translating sext, zext, and trunc instructions,
enabling more PRE. PR8586.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119704 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/GVN/phi-translate.ll')
| -rw-r--r-- | test/Transforms/GVN/phi-translate.ll | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/test/Transforms/GVN/phi-translate.ll b/test/Transforms/GVN/phi-translate.ll new file mode 100644 index 0000000..f10537e --- /dev/null +++ b/test/Transforms/GVN/phi-translate.ll @@ -0,0 +1,31 @@ +; RUN: opt -basicaa -gvn -S < %s | FileCheck %s + +target datalayout = "e-p:64:64:64" + +; CHECK: @foo +; CHECK: entry.end_crit_edge: +; CHECK: %n.pre = load i32* %q.phi.trans.insert +; CHECK: then: +; CHECK: store i32 %z +; CHECK: end: +; CHECK: %n = phi i32 [ %n.pre, %entry.end_crit_edge ], [ %z, %then ] +; CHECK: ret i32 %n + +@G = external global [100 x i32] +define i32 @foo(i32 %x, i32 %z) { +entry: + %tobool = icmp eq i32 %x, 0 + br i1 %tobool, label %end, label %then + +then: + %i = sext i32 %x to i64 + %p = getelementptr [100 x i32]* @G, i64 0, i64 %i + store i32 %z, i32* %p + br label %end + +end: + %j = sext i32 %x to i64 + %q = getelementptr [100 x i32]* @G, i64 0, i64 %j + %n = load i32* %q + ret i32 %n +} |