LoopVectorize: Fix a bug in the scalarization of instructions.

Before if-conversion we could check if a value is loop invariant
if it was declared inside the basic block. Now that loops have
multiple blocks this check is incorrect.

This fixes External/SPEC/CINT95/099_go/099_go

llvm-svn: 170756

1 files changed, 48 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopVectorize/scalar-store.ll b/llvm/test/Transforms/LoopVectorize/scalar-store.ll
new file mode 100644
index 00000000000..5d207f94454
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/scalar-store.ll
@@ -0,0 +1,48 @@
+; RUN: opt < %s  -loop-vectorize -force-vector-width=4 -dce -instcombine -licm -S -enable-if-conversion | FileCheck %s
+
+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"
+target triple = "x86_64-apple-macosx10.9.0"
+
+; When we scalarize a store, make sure that the addresses are extracted
+; from a vector. We had a bug where the addresses were the old scalar
+; addresses.
+
+; CHECK: @foo
+; CHECK: select
+; CHECK: extractelement
+; CHECK-NEXT: store
+; CHECK: extractelement
+; CHECK-NEXT: store
+; CHECK: extractelement
+; CHECK-NEXT: store
+; CHECK: extractelement
+; CHECK-NEXT: store
+; CHECK: ret
+define i32 @foo(i32* nocapture %a) nounwind uwtable ssp {
+  br label %1
+
+; <label>:1                                       ; preds = %7, %0
+  %indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %7 ]
+  %2 = mul nsw i64 %indvars.iv, 7
+  %3 = getelementptr inbounds i32* %a, i64 %2
+  %4 = load i32* %3, align 4
+  %5 = icmp sgt i32 %4, 3
+  br i1 %5, label %6, label %7
+
+; <label>:6                                       ; preds = %1
+  %tmp = add i32 %4, 4
+  %tmp1 = mul i32 %tmp, %4
+  br label %7
+
+; <label>:7                                       ; preds = %6, %1
+  %x.0 = phi i32 [ %tmp1, %6 ], [ %4, %1 ]
+  %8 = add nsw i32 %x.0, 3
+  store i32 %8, i32* %3, align 4
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, 256
+  br i1 %exitcond, label %9, label %1
+
+; <label>:9                                       ; preds = %7
+  ret i32 0
+}