From 967948b4e25cae3de68f38fddaa75d838e676dec Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Wed, 23 Jul 2008 05:06:28 +0000 Subject: "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 --- .../LICM/2008-07-22-LoadGlobalConstant.ll | 23 ++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 test/Transforms/LICM/2008-07-22-LoadGlobalConstant.ll (limited to 'test/Transforms/LICM') 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 +} -- cgit v1.1