diff options
Diffstat (limited to 'llvm/test/Transforms/LoopStrengthReduce/share_code_in_preheader.ll')
| -rw-r--r-- | llvm/test/Transforms/LoopStrengthReduce/share_code_in_preheader.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopStrengthReduce/share_code_in_preheader.ll b/llvm/test/Transforms/LoopStrengthReduce/share_code_in_preheader.ll new file mode 100644 index 00000000000..1035ce19ff1 --- /dev/null +++ b/llvm/test/Transforms/LoopStrengthReduce/share_code_in_preheader.ll @@ -0,0 +1,27 @@ +; RUN: opt < %s -loop-reduce -S | grep mul | count 1 +; LSR should not make two copies of the Q*L expression in the preheader! + +define i8 @test(i8* %A, i8* %B, i32 %L, i32 %Q, i32 %N.s) { +entry: + %tmp.6 = mul i32 %Q, %L ; <i32> [#uses=1] + %N = bitcast i32 %N.s to i32 ; <i32> [#uses=1] + br label %no_exit +no_exit: ; preds = %no_exit, %entry + %indvar.ui = phi i32 [ 0, %entry ], [ %indvar.next, %no_exit ] ; <i32> [#uses=2] + %Sum.0.0 = phi i8 [ 0, %entry ], [ %tmp.21, %no_exit ] ; <i8> [#uses=1] + %indvar = bitcast i32 %indvar.ui to i32 ; <i32> [#uses=1] + %N_addr.0.0 = sub i32 %N.s, %indvar ; <i32> [#uses=1] + %tmp.8 = add i32 %N_addr.0.0, %tmp.6 ; <i32> [#uses=2] + %tmp.9 = getelementptr i8, i8* %A, i32 %tmp.8 ; <i8*> [#uses=1] + %tmp.10 = load i8, i8* %tmp.9 ; <i8> [#uses=1] + %tmp.17 = getelementptr i8, i8* %B, i32 %tmp.8 ; <i8*> [#uses=1] + %tmp.18 = load i8, i8* %tmp.17 ; <i8> [#uses=1] + %tmp.19 = sub i8 %tmp.10, %tmp.18 ; <i8> [#uses=1] + %tmp.21 = add i8 %tmp.19, %Sum.0.0 ; <i8> [#uses=2] + %indvar.next = add i32 %indvar.ui, 1 ; <i32> [#uses=2] + %exitcond = icmp eq i32 %indvar.next, %N ; <i1> [#uses=1] + br i1 %exitcond, label %loopexit, label %no_exit +loopexit: ; preds = %no_exit + ret i8 %tmp.21 +} + |
