diff options
Diffstat (limited to 'llvm/test/Transforms/TailCallElim/accum_recursion.ll')
| -rw-r--r-- | llvm/test/Transforms/TailCallElim/accum_recursion.ll | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/llvm/test/Transforms/TailCallElim/accum_recursion.ll b/llvm/test/Transforms/TailCallElim/accum_recursion.ll index b2a9ed2813d..66928a30324 100644 --- a/llvm/test/Transforms/TailCallElim/accum_recursion.ll +++ b/llvm/test/Transforms/TailCallElim/accum_recursion.ll @@ -1,15 +1,40 @@ -; RUN: opt < %s -tailcallelim -S | not grep call +; RUN: opt < %s -tailcallelim -S | FileCheck %s -define i32 @factorial(i32 %x) { +define i32 @test1_factorial(i32 %x) { entry: %tmp.1 = icmp sgt i32 %x, 0 ; <i1> [#uses=1] br i1 %tmp.1, label %then, label %else then: ; preds = %entry %tmp.6 = add i32 %x, -1 ; <i32> [#uses=1] - %tmp.4 = call i32 @factorial( i32 %tmp.6 ) ; <i32> [#uses=1] + %tmp.4 = call i32 @test1_factorial( i32 %tmp.6 ) ; <i32> [#uses=1] %tmp.7 = mul i32 %tmp.4, %x ; <i32> [#uses=1] ret i32 %tmp.7 else: ; preds = %entry ret i32 1 } +; CHECK: define i32 @test1_factorial +; CHECK: phi i32 +; CHECK-NOT: call i32 +; CHECK: else: + +; This is a more aggressive form of accumulator recursion insertion, which +; requires noticing that X doesn't change as we perform the tailcall. + +define i32 @test2_mul(i32 %x, i32 %y) { +entry: + %tmp.1 = icmp eq i32 %y, 0 ; <i1> [#uses=1] + br i1 %tmp.1, label %return, label %endif +endif: ; preds = %entry + %tmp.8 = add i32 %y, -1 ; <i32> [#uses=1] + %tmp.5 = call i32 @test2_mul( i32 %x, i32 %tmp.8 ) ; <i32> [#uses=1] + %tmp.9 = add i32 %tmp.5, %x ; <i32> [#uses=1] + ret i32 %tmp.9 +return: ; preds = %entry + ret i32 %x +} + +; CHECK: define i32 @test2_mul +; CHECK: phi i32 +; CHECK-NOT: call i32 +; CHECK: return:
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