6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-02 07:32:52 +00:00
Code Issues Projects Releases Wiki Activity

Add a test for TCE return duplication.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124527 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2011-01-29 04:53:35 +00:00
parent c3f507f98a
commit 60f5ad46c2
2 changed files with 25 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/Transforms/Scalar/TailRecursionElimination.cpp
View File

@ -72,6 +72,7 @@
using namespace llvm;
STATISTIC(NumEliminated, "Number of tail calls removed");
STATISTIC(NumRetDuped, "Number of return duplicated");
STATISTIC(NumAccumAdded, "Number of accumulators introduced");
namespace {
@ -606,6 +607,7 @@ bool TailCallElim::FoldReturnAndProcessPred(BasicBlock *BB,
EliminateRecursiveTailCall(CI, FoldReturnIntoUncondBranch(Ret, BB, Pred),
OldEntry, TailCallsAreMarkedTail, ArgumentPHIs,
CannotTailCallElimCallsMarkedTail);
++NumRetDuped;
Change = true;
}
}

23
test/Transforms/TailCallElim/dup_tail.ll Normal file
View File

@ -0,0 +1,23 @@
; Duplicate the return into if.end to enable TCE.
; RUN: opt %s -tailcallelim -stats -disable-output |& grep {Number of return duplicated}
define i32 @fib(i32 %n) nounwind ssp {
entry:
%cmp = icmp slt i32 %n, 2
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
br label %return
if.end: ; preds = %entry
%sub = add nsw i32 %n, -2
%call = call i32 @fib(i32 %sub)
%sub3 = add nsw i32 %n, -1
%call4 = call i32 @fib(i32 %sub3)
%add = add nsw i32 %call, %call4
br label %return
return: ; preds = %if.end, %if.then
%retval.0 = phi i32 [ 1, %if.then ], [ %add, %if.end ]
ret i32 %retval.0
}