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| author | Chris Lattner <sabre@nondot.org> | 2008-07-23 05:06:28 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-07-23 05:06:28 +0000 |
| commit | 967948b4e25cae3de68f38fddaa75d838e676dec (patch) | |
| tree | d4a991f40c7367570d36eb6fbd90abaea879d68a /test/Transforms/LICM | |
| parent | a9173801caf73613d3fa07b1094b5539d9223953 (diff) | |
| download | external_llvm-967948b4e25cae3de68f38fddaa75d838e676dec.zip external_llvm-967948b4e25cae3de68f38fddaa75d838e676dec.tar.gz external_llvm-967948b4e25cae3de68f38fddaa75d838e676dec.tar.bz2 | |
"Allow LICM to sink or lift loads from constant memory. Also add a test
case for this.
This allows instructions like loads from global variables declared to
be constant to be moved out of loops."
Patch by Stefanus Du Toit!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53945 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/LICM')
| -rw-r--r-- | test/Transforms/LICM/2008-07-22-LoadGlobalConstant.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/test/Transforms/LICM/2008-07-22-LoadGlobalConstant.ll b/test/Transforms/LICM/2008-07-22-LoadGlobalConstant.ll new file mode 100644 index 0000000..c3af29b --- /dev/null +++ b/test/Transforms/LICM/2008-07-22-LoadGlobalConstant.ll @@ -0,0 +1,23 @@ +; RUN: llvm-as < %s | opt -licm | llvm-dis | grep -A 1 entry | grep load.*@a +@a = external constant float* + +define void @test(i32 %count) { +entry: + br label %forcond + +forcond: + %i.0 = phi i32 [ 0, %entry ], [ %inc, %forbody ] + %cmp = icmp ult i32 %i.0, %count + br i1 %cmp, label %forbody, label %afterfor + +forbody: + %tmp3 = load float** @a + %arrayidx = getelementptr float* %tmp3, i32 %i.0 + %tmp7 = uitofp i32 %i.0 to float + store float %tmp7, float* %arrayidx + %inc = add i32 %i.0, 1 + br label %forcond + +afterfor: + ret void +} |