diff options
Diffstat (limited to 'llvm/test/Transforms/LoopLoadElim/backward.ll')
| -rw-r--r-- | llvm/test/Transforms/LoopLoadElim/backward.ll | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopLoadElim/backward.ll b/llvm/test/Transforms/LoopLoadElim/backward.ll new file mode 100644 index 00000000000..c0cec75bdd3 --- /dev/null +++ b/llvm/test/Transforms/LoopLoadElim/backward.ll @@ -0,0 +1,33 @@ +; RUN: opt -loop-load-elim -S < %s | FileCheck %s +; RUN: opt -passes=loop-load-elim -S < %s | FileCheck %s + +; Simple st->ld forwarding derived from a lexical backward dep. +; +; for (unsigned i = 0; i < 100; i++) +; A[i+1] = A[i] + B[i]; + +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" + +define void @f(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N) { +entry: +; CHECK: %load_initial = load i32, i32* %A + br label %for.body + +for.body: ; preds = %for.body, %entry +; CHECK: %store_forwarded = phi i32 [ %load_initial, %entry ], [ %add, %for.body ] + %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] + %arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv + %load = load i32, i32* %arrayidx, align 4 + %arrayidx2 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv + %load_1 = load i32, i32* %arrayidx2, align 4 +; CHECK: %add = add i32 %load_1, %store_forwarded + %add = add i32 %load_1, %load + %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 + %arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next + store i32 %add, i32* %arrayidx_next, align 4 + %exitcond = icmp eq i64 %indvars.iv.next, %N + br i1 %exitcond, label %for.end, label %for.body + +for.end: ; preds = %for.body + ret void +} |
