[polly] r265795 - [ScopInfo] Fix check for element size mismatch.
Michael Kruse via llvm-commits
llvm-commits at lists.llvm.org
Fri Apr 8 09:20:08 PDT 2016
Author: meinersbur
Date: Fri Apr 8 11:20:08 2016
New Revision: 265795
URL: http://llvm.org/viewvc/llvm-project?rev=265795&view=rev
Log:
[ScopInfo] Fix check for element size mismatch.
The way to get the elements size with getPrimitiveSizeInBits() is not
the same as used in other parts of Polly which should use
DataLayout::getTypeAllocSize(). Its use only queries the size of the
pointer and getPrimitiveSizeInBits returns 0 for types that require a
DataLayout object such as pointers.
Together with r265379, this should fix PR27195.
Added:
polly/trunk/test/ScopInfo/multidim_gep_pointercast.ll
Modified:
polly/trunk/lib/Analysis/ScopInfo.cpp
Modified: polly/trunk/lib/Analysis/ScopInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/lib/Analysis/ScopInfo.cpp?rev=265795&r1=265794&r2=265795&view=diff
==============================================================================
--- polly/trunk/lib/Analysis/ScopInfo.cpp (original)
+++ polly/trunk/lib/Analysis/ScopInfo.cpp Fri Apr 8 11:20:08 2016
@@ -3992,7 +3992,9 @@ bool ScopInfo::buildAccessMultiDimFixed(
auto *Src = BitCast->getOperand(0);
auto *SrcTy = Src->getType();
auto *DstTy = BitCast->getType();
- if (SrcTy->getPrimitiveSizeInBits() == DstTy->getPrimitiveSizeInBits())
+ if (SrcTy->isPointerTy() && DstTy->isPointerTy() &&
+ DL->getTypeAllocSize(SrcTy->getPointerElementType()) ==
+ DL->getTypeAllocSize(DstTy->getPointerElementType()))
Address = Src;
}
Added: polly/trunk/test/ScopInfo/multidim_gep_pointercast.ll
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/test/ScopInfo/multidim_gep_pointercast.ll?rev=265795&view=auto
==============================================================================
--- polly/trunk/test/ScopInfo/multidim_gep_pointercast.ll (added)
+++ polly/trunk/test/ScopInfo/multidim_gep_pointercast.ll Fri Apr 8 11:20:08 2016
@@ -0,0 +1,56 @@
+; RUN: opt %loadPolly -polly-scops -analyze < %s | FileCheck %s
+;
+; The load access to A has a pointer-bitcast to another elements size before the
+; GetElementPtr. Verify that we do not the GEP delinearization because it
+; mismatches with the size of the loaded element type.
+;
+; void f(short A[][4], int N, int P) {
+; short(*B)[4] = &A[P][0];
+; for (int i = 0; i < N; i++)
+; *((<4 x short> *)&A[7 * i][0]) = *((<4 x short>)&B[7 * i][0]);
+; }
+;
+define void @f([4 x i16]* %A, i32 %N, i32 %P) {
+entry:
+ %arrayidx1 = getelementptr inbounds [4 x i16], [4 x i16]* %A, i32 %P, i64 0
+ %tmp = bitcast i16* %arrayidx1 to [4 x i16]*
+ br label %for.cond
+
+for.cond:
+ %indvars.iv = phi i32 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
+ %cmp = icmp slt i32 %indvars.iv, %N
+ br i1 %cmp, label %for.body, label %for.end
+
+for.body:
+ %mul = mul nsw i32 %indvars.iv, 7
+ %arrayidx4 = getelementptr inbounds [4 x i16], [4 x i16]* %tmp, i32 %mul, i64 0
+ %bc4 = bitcast i16* %arrayidx4 to <4 x i16>*
+ %tmp3 = load <4 x i16>, <4 x i16>* %bc4
+ %arrayidx8 = getelementptr inbounds [4 x i16], [4 x i16]* %A, i32 %mul, i64 0
+ %bc8 = bitcast i16* %arrayidx8 to <4 x i16>*
+ store <4 x i16> %tmp3, <4 x i16>* %bc8
+ br label %for.inc
+
+for.inc:
+ %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
+ br label %for.cond
+
+for.end:
+ ret void
+}
+
+
+; CHECK: Arrays {
+; CHECK-NEXT: <4 x i16> MemRef_A[*]; // Element size 8
+; CHECK-NEXT: }
+; CHECK: Statements {
+; CHECK-NEXT: Stmt_for_body
+; CHECK-NEXT: Domain :=
+; CHECK-NEXT: [N, P] -> { Stmt_for_body[i0] : 0 <= i0 < N };
+; CHECK-NEXT: Schedule :=
+; CHECK-NEXT: [N, P] -> { Stmt_for_body[i0] -> [i0] };
+; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
+; CHECK-NEXT: [N, P] -> { Stmt_for_body[i0] -> MemRef_A[P + 7i0] };
+; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
+; CHECK-NEXT: [N, P] -> { Stmt_for_body[i0] -> MemRef_A[7i0] };
+; CHECK-NEXT: }
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