aboutsummaryrefslogtreecommitdiffstats
path: root/test/Analysis
diff options
context:
space:
mode:
authorAndrew Trick <atrick@apple.com>2012-05-30 03:35:20 +0000
committerAndrew Trick <atrick@apple.com>2012-05-30 03:35:20 +0000
commitfe3516f9a5f238ecf6872b5315706c7c7942a496 (patch)
tree5a671bdb757ae2a22b56e0a563c2b21a8bab94e8 /test/Analysis
parent97178aedb5f337ad9a6ac86fa052e777c7ad50d0 (diff)
downloadexternal_llvm-fe3516f9a5f238ecf6872b5315706c7c7942a496.zip
external_llvm-fe3516f9a5f238ecf6872b5315706c7c7942a496.tar.gz
external_llvm-fe3516f9a5f238ecf6872b5315706c7c7942a496.tar.bz2
SCEV: Handle a corner case reducing AddRecExpr * AddRecExpr
If integer overflow causes one of the terms to reach zero, that can force the entire expression to zero. Fixes PR12929: cast<Ty>() argument of incompatible type git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157673 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Analysis')
-rw-r--r--test/Analysis/ScalarEvolution/2012-05-29-MulAddRec.ll45
1 files changed, 45 insertions, 0 deletions
diff --git a/test/Analysis/ScalarEvolution/2012-05-29-MulAddRec.ll b/test/Analysis/ScalarEvolution/2012-05-29-MulAddRec.ll
new file mode 100644
index 0000000..eee4ec4
--- /dev/null
+++ b/test/Analysis/ScalarEvolution/2012-05-29-MulAddRec.ll
@@ -0,0 +1,45 @@
+; RUN: opt < %s -S -indvars -loop-unroll | FileCheck %s
+;
+; loop-unroll fully unrolls the inner loop, creating an interesting
+; chain of multiplication. indvars forces SCEV to run again on the
+; outer loop. While reducing the recurrence at %mul3, unsigned integer overflow
+; causes one of the terms to reach zero. This forces all multiples in
+; the recurrence to be zero, reducing the whole thing to a constant expression.
+;
+; PR12929: cast<Ty>() argument of incompatible type
+
+; CHECK: @func
+; CHECK: for.cond:
+; CHECK: %inc1 = phi i8 [ 0, %entry ], [ %0, %for.body ]
+; CHECK: br label %for.body
+
+; CHECK: for.body:
+; CHECK: %inc.9 = add i8 %inc.8, 1
+; CHECK: %0 = add i8 %inc1, 10
+; CHEKC: br label %for.cond
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+define void @func() noreturn nounwind uwtable ssp {
+entry:
+ br label %for.cond
+
+for.cond.loopexit: ; preds = %for.body
+ %mul.lcssa = phi i8 [ %mul, %for.body ]
+ %0 = add i8 %inc1, 10
+ %indvars.iv.next = add i8 %indvars.iv, 10
+ br label %for.cond
+
+for.cond: ; preds = %for.cond.loopexit, %entry
+ %indvars.iv = phi i8 [ %indvars.iv.next, %for.cond.loopexit ], [ 10, %entry ]
+ %mul3 = phi i8 [ undef, %entry ], [ %mul.lcssa, %for.cond.loopexit ]
+ %inc1 = phi i8 [ 0, %entry ], [ %0, %for.cond.loopexit ]
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.cond
+ %inc26 = phi i8 [ %inc1, %for.cond ], [ %inc, %for.body ]
+ %mul45 = phi i8 [ %mul3, %for.cond ], [ %mul, %for.body ]
+ %inc = add i8 %inc26, 1
+ %mul = mul i8 %inc26, %mul45
+ %exitcond = icmp ne i8 %inc, %indvars.iv
+ br i1 %exitcond, label %for.body, label %for.cond.loopexit
+}