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| author | Duncan Sands <baldrick@free.fr> | 2012-02-05 18:25:50 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2012-02-05 18:25:50 +0000 |
| commit | 33756f96d75e20d336f404debf701e8d6b4ecfc8 (patch) | |
| tree | 6f264e2b9db41a01fb67ccf7fb894ca4fde8de62 /test/Transforms/GVN/condprop.ll | |
| parent | 68e20223a7260b5978dc85af6fea647be4c6a5f9 (diff) | |
| download | external_llvm-33756f96d75e20d336f404debf701e8d6b4ecfc8.zip external_llvm-33756f96d75e20d336f404debf701e8d6b4ecfc8.tar.gz external_llvm-33756f96d75e20d336f404debf701e8d6b4ecfc8.tar.bz2 | |
Reduce the number of dom queries made by GVN's conditional propagation
logic by half: isOnlyReachableViaThisEdge was trying to be clever and
handle the case of a branch to a basic block which is contained in a
loop. This costs a domtree lookup and is completely useless due to
GVN's position in the pass pipeline: all loops have preheaders at this
point, which means it is enough for isOnlyReachableViaThisEdge to check
that Dst has only one predecessor. (I checked this theoretical argument
by running over the entire nightly testsuite, and indeed it is so!).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149838 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/GVN/condprop.ll')
| -rw-r--r-- | test/Transforms/GVN/condprop.ll | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/test/Transforms/GVN/condprop.ll b/test/Transforms/GVN/condprop.ll index 0b31b01..c17c994 100644 --- a/test/Transforms/GVN/condprop.ll +++ b/test/Transforms/GVN/condprop.ll @@ -55,25 +55,6 @@ return: ; preds = %bb8 } declare void @foo(i1) - -; CHECK: @test2 -define void @test2(i1 %x, i1 %y) { - %z = or i1 %x, %y - br i1 %z, label %true, label %false -true: -; CHECK: true: - %z2 = or i1 %x, %y - call void @foo(i1 %z2) -; CHECK: call void @foo(i1 true) - br label %true -false: -; CHECK: false: - %z3 = or i1 %x, %y - call void @foo(i1 %z3) -; CHECK: call void @foo(i1 false) - br label %false -} - declare void @bar(i32) ; CHECK: @test3 |