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Diffstat (limited to 'test/Transforms/LICM/extra-copies.ll')
| -rw-r--r-- | test/Transforms/LICM/extra-copies.ll | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/test/Transforms/LICM/extra-copies.ll b/test/Transforms/LICM/extra-copies.ll new file mode 100644 index 0000000..ef52f9f --- /dev/null +++ b/test/Transforms/LICM/extra-copies.ll @@ -0,0 +1,29 @@ +; RUN: opt < %s -licm -S | FileCheck %s +; PR19835 +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +define i32 @f(i32 %x) { +entry: + br label %for.body + +for.body: ; preds = %entry, %for.body + %storemerge4 = phi i32 [ 0, %entry ], [ %inc, %for.body ] + %mul = mul nsw i32 %x, %x + %add2 = add nsw i32 %mul, %x + %mul3 = add nsw i32 %add2, %mul + %inc = add nsw i32 %storemerge4, 1 + %cmp = icmp slt i32 %inc, 100 + br i1 %cmp, label %for.body, label %for.end + +for.end: ; preds = %for.body + %a9.0.lcssa = phi i32 [ %mul3, %for.body ] + ret i32 %a9.0.lcssa +} + +; Test that there is exactly one copy of mul nsw i32 %x, %x in the exit block. +; CHECK: define i32 @f(i32 [[X:%.*]]) +; CHECK: for.end: +; CHECK-NOT: mul nsw i32 [[X]], [[X]] +; CHECK: mul nsw i32 [[X]], [[X]] +; CHECK-NOT: mul nsw i32 [[X]], [[X]] |