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vectorizer: Add support for reading and writing from the same memory location. 

llvm-svn: 166255
This commit is contained in:
Nadav Rotem 2012-10-19 01:24:18 +00:00
parent 282c92a708
commit ced93f3a05
2 changed files with 44 additions and 2 deletions
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9
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -715,6 +715,7 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) {
ValueVector Reads;
ValueVector Writes;
SmallPtrSet<Value*, 16> AnalyzedPtrs;
unsigned NumPhis = 0;
for (BasicBlock::iterator it = BB.begin(), e = BB.end(); it != e; ++it) {
Instruction *I = it;
@ -766,7 +767,10 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) {
DEBUG(dbgs() << "LV: Found a non-simple load.\n");
return false;
}
GetUnderlyingObjects(Ld->getPointerOperand(), Reads, DL);
Value* Ptr = Ld->getPointerOperand();
if (AnalyzedPtrs.insert(Ptr))
GetUnderlyingObjects(Ptr, Reads, DL);
}
// Record store pointers. Abort on all other instructions that write to
@ -778,6 +782,9 @@ bool LoopVectorizationLegality::canVectorizeBlock(BasicBlock &BB) {
DEBUG(dbgs() << "LV: Found a non-simple store.\n");
return false;
}
Value* Ptr = St->getPointerOperand();
if (AnalyzedPtrs.insert(Ptr))
GetUnderlyingObjects(St->getPointerOperand(), Writes, DL);
}

35
llvm/test/Transforms/LoopVectorize/increment.ll Normal file
View File

@ -0,0 +1,35 @@
; RUN: opt < %s -loop-vectorize -dce -instcombine -licm -S | 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-macosx10.8.0"
@a = common global [2048 x i32] zeroinitializer, align 16
; This is the loop.
; for (i=0; i<n; i++){
; a[i] += i;
; }
;CHECK: @inc
;CHECK: load <4 x i32>
;CHECK: add <4 x i32>
;CHECK: store <4 x i32>
;CHECK: ret void
define void @inc(i32 %n) nounwind uwtable noinline ssp {
%1 = icmp sgt i32 %n, 0
br i1 %1, label %.lr.ph, label %._crit_edge
.lr.ph: ; preds = %0, %.lr.ph
%indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
%2 = getelementptr inbounds [2048 x i32]* @a, i64 0, i64 %indvars.iv
%3 = load i32* %2, align 4
%4 = trunc i64 %indvars.iv to i32
%5 = add nsw i32 %3, %4
store i32 %5, i32* %2, 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, %n
br i1 %exitcond, label %._crit_edge, label %.lr.ph
._crit_edge: ; preds = %.lr.ph, %0
ret void
}