diff options
Diffstat (limited to 'llvm/test/Transforms/TailCallElim')
| -rw-r--r-- | llvm/test/Transforms/TailCallElim/dont_reorder_load.ll | 20 | ||||
| -rw-r--r-- | llvm/test/Transforms/TailCallElim/reorder_load.ll | 23 |
2 files changed, 42 insertions, 1 deletions
diff --git a/llvm/test/Transforms/TailCallElim/dont_reorder_load.ll b/llvm/test/Transforms/TailCallElim/dont_reorder_load.ll index ac399a1bf5a..f8542799cc6 100644 --- a/llvm/test/Transforms/TailCallElim/dont_reorder_load.ll +++ b/llvm/test/Transforms/TailCallElim/dont_reorder_load.ll @@ -1,4 +1,4 @@ -; RUN: opt < %s -tailcallelim -S | grep call | count 3 +; RUN: opt < %s -tailcallelim -S | grep call | count 4 ; PR4323 ; Several cases where tail call elimination should not move the load above the @@ -62,3 +62,21 @@ else: ; preds = %entry %tmp10 = add i32 %tmp9, %tmp8 ; <i32> [#uses=1] ret i32 %tmp10 } + +; This load can NOT be moved above the call because the a_arg is not +; sufficiently dereferenceable. +define fastcc i32 @no_tailrecelim_4(i32* dereferenceable(2) %a_arg, i32 %a_len_arg, i32 %start_arg) readonly { +entry: + %tmp2 = icmp sge i32 %start_arg, %a_len_arg ; <i1> [#uses=1] + br i1 %tmp2, label %if, label %else + +if: ; preds = %entry + ret i32 0 + +else: ; preds = %entry + %tmp7 = add i32 %start_arg, 1 ; <i32> [#uses=1] + %tmp8 = call fastcc i32 @no_tailrecelim_4(i32* %a_arg, i32 %a_len_arg, i32 %tmp7) ; <i32> [#uses=1] + %tmp9 = load i32, i32* %a_arg ; <i32> [#uses=1] + %tmp10 = add i32 %tmp9, %tmp8 ; <i32> [#uses=1] + ret i32 %tmp10 +} diff --git a/llvm/test/Transforms/TailCallElim/reorder_load.ll b/llvm/test/Transforms/TailCallElim/reorder_load.ll index b989bbf9547..2f9b692d099 100644 --- a/llvm/test/Transforms/TailCallElim/reorder_load.ll +++ b/llvm/test/Transforms/TailCallElim/reorder_load.ll @@ -122,3 +122,26 @@ recurse: ; preds = %else %tmp10 = add i32 %second, %tmp8 ; <i32> [#uses=1] ret i32 %tmp10 } + +; This load can be moved above the call because the function won't write to it +; and the a_arg is dereferenceable. +define fastcc i32 @raise_load_5(i32* dereferenceable(4) %a_arg, i32 %a_len_arg, i32 %start_arg) readonly { +; CHECK-LABEL: @raise_load_5( +; CHECK-NOT: call +; CHECK: load i32, i32* +; CHECK-NOT: call +; CHECK: } +entry: + %tmp2 = icmp sge i32 %start_arg, %a_len_arg ; <i1> [#uses=1] + br i1 %tmp2, label %if, label %else + +if: ; preds = %entry + ret i32 0 + +else: ; preds = %entry + %tmp7 = add i32 %start_arg, 1 ; <i32> [#uses=1] + %tmp8 = call fastcc i32 @raise_load_5(i32* %a_arg, i32 %a_len_arg, i32 %tmp7) ; <i32> [#uses=1] + %tmp9 = load i32, i32* %a_arg ; <i32> [#uses=1] + %tmp10 = add i32 %tmp9, %tmp8 ; <i32> [#uses=1] + ret i32 %tmp10 +} |
