diff options
Diffstat (limited to 'llvm/test/Transforms/LoopVectorize/read-only.ll')
| -rw-r--r-- | llvm/test/Transforms/LoopVectorize/read-only.ll | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopVectorize/read-only.ll b/llvm/test/Transforms/LoopVectorize/read-only.ll index 921e3fcdae1..a749293fb36 100644 --- a/llvm/test/Transforms/LoopVectorize/read-only.ll +++ b/llvm/test/Transforms/LoopVectorize/read-only.ll @@ -29,3 +29,33 @@ define i32 @read_only_func(i32* nocapture %A, i32* nocapture %B, i32 %n) nounwin %sum.0.lcssa = phi i32 [ 0, %0 ], [ %9, %.lr.ph ] ret i32 %sum.0.lcssa } + +; Ensure that volatile loads are not vectorized in a read-only loop. + +;CHECK-LABEL: @read_only_func_volatile( +;CHECK-NOT: load <4 x i32> +;CHECK: ret i32 +define i32 @read_only_func_volatile(i32* nocapture %A, i32* nocapture %B, i32 %n) nounwind uwtable readonly ssp { + %1 = icmp sgt i32 %n, 0 + br i1 %1, label %.lr.ph, label %._crit_edge + +.lr.ph: ; preds = %0, %.lr.ph + %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ] + %sum.02 = phi i32 [ %9, %.lr.ph ], [ 0, %0 ] + %2 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv + %3 = load volatile i32, i32* %2, align 4 + %4 = add nsw i64 %indvars.iv, 13 + %5 = getelementptr inbounds i32, i32* %B, i64 %4 + %6 = load i32, i32* %5, align 4 + %7 = shl i32 %6, 1 + %8 = add i32 %3, %sum.02 + %9 = add i32 %8, %7 + %indvars.iv.next = add i64 %indvars.iv, 1 + %lftr.wideiv = trunc i64 %indvars.iv.next to i32 + %exitcond = icmp eq i32 %lftr.wideiv, %n + br i1 %exitcond, label %._crit_edge, label %.lr.ph + +._crit_edge: ; preds = %.lr.ph, %0 + %sum.0.lcssa = phi i32 [ 0, %0 ], [ %9, %.lr.ph ] + ret i32 %sum.0.lcssa +} |
