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Diffstat (limited to 'test/Transforms/LoopUnroll/nsw-tripcount.ll')
-rw-r--r-- | test/Transforms/LoopUnroll/nsw-tripcount.ll | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/test/Transforms/LoopUnroll/nsw-tripcount.ll b/test/Transforms/LoopUnroll/nsw-tripcount.ll new file mode 100644 index 0000000..98cab32 --- /dev/null +++ b/test/Transforms/LoopUnroll/nsw-tripcount.ll @@ -0,0 +1,32 @@ +; RUN: opt -loop-unroll -S %s | FileCheck %s + +; extern void f(int); +; void test1(int v) { +; for (int i=v; i<=v+1; ++i) +; f(i); +; } +; +; We can use the nsw information to see that the tripcount will be 2, so the +; loop should be unrolled as this is always beneficial + +declare void @f(i32) + +; CHECK-LABEL: @test1 +define void @test1(i32 %v) { +entry: + %add = add nsw i32 %v, 1 + br label %for.body + +for.body: + %i.04 = phi i32 [ %v, %entry ], [ %inc, %for.body ] + tail call void @f(i32 %i.04) + %inc = add nsw i32 %i.04, 1 + %cmp = icmp slt i32 %i.04, %add + br i1 %cmp, label %for.body, label %for.end + +; CHECK: call void @f +; CHECK-NOT: br i1 +; CHECK: call void @f +for.end: + ret void +} |