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Diffstat (limited to 'test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll')
-rw-r--r-- | test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll b/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll new file mode 100644 index 0000000..6b1943f --- /dev/null +++ b/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll @@ -0,0 +1,27 @@ +; RUN: opt -S -unroll-runtime -loop-unroll < %s | FileCheck %s + +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" + +;; Check that we don't emit expensive instructions to compute trip +;; counts when unrolling loops. + +define i32 @test(i64 %v12, i8* %array, i64* %loc) { +; CHECK-LABEL: @test( +; CHECK-NOT: udiv +entry: + %step = load i64, i64* %loc, !range !0 + br label %loop + +loop: ; preds = %entry, %loop + %k.015 = phi i64 [ %v15, %loop ], [ %v12, %entry ] + %v14 = getelementptr inbounds i8, i8* %array, i64 %k.015 + store i8 0, i8* %v14 + %v15 = add nuw nsw i64 %k.015, %step + %v16 = icmp slt i64 %v15, 8193 + br i1 %v16, label %loop, label %loopexit + +loopexit: ; preds = %loop + ret i32 0 +} + +!0 = !{i64 1, i64 100} |