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Fix PR16797 - Support PHINodes with multiple inputs from the same basic block.

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Do not generate new vector values for the same entries because we know that the incoming values
from the same block must be identical.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188185 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-08-12 17:46:44 +00:00
parent 225396c2b5
commit 353476cbbb
2 changed files with 52 additions and 0 deletions
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11
lib/Transforms/Vectorize/SLPVectorizer.cpp
View File

@ -1187,10 +1187,21 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
PHINode *NewPhi = Builder.CreatePHI(VecTy, PH->getNumIncomingValues());
E->VectorizedValue = NewPhi;
// PHINodes may have multiple entries from the same block. We want to
// visit every block once.
SmallSet<BasicBlock*, 4> VisitedBBs;
for (unsigned i = 0, e = PH->getNumIncomingValues(); i < e; ++i) {
ValueList Operands;
BasicBlock *IBB = PH->getIncomingBlock(i);
if (VisitedBBs.count(IBB)) {
NewPhi->addIncoming(NewPhi->getIncomingValueForBlock(IBB), IBB);
continue;
}
VisitedBBs.insert(IBB);
// Prepare the operand vector.
for (unsigned j = 0; j < E->Scalars.size(); ++j)
Operands.push_back(cast<PHINode>(E->Scalars[j])->

41
test/Transforms/SLPVectorizer/X86/crash_netbsd_decompress.ll Normal file
View File

@ -0,0 +1,41 @@
; RUN: opt < %s -basicaa -slp-vectorizer -dce -S -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7
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"
%struct.DState = type { i32, i32 }
@b = common global %struct.DState zeroinitializer, align 4
@d = common global i32 0, align 4
@c = common global i32 0, align 4
@a = common global i32 0, align 4
@e = common global i32 0, align 4
define i32 @fn1() {
entry:
%0 = load i32* getelementptr inbounds (%struct.DState* @b, i32 0, i32 0), align 4
%1 = load i32* getelementptr inbounds (%struct.DState* @b, i32 0, i32 1), align 4
%2 = load i32* @d, align 4
%cond = icmp eq i32 %2, 0
br i1 %cond, label %sw.bb, label %save_state_and_return
sw.bb: ; preds = %entry
%3 = load i32* @c, align 4
%and = and i32 %3, 7
store i32 %and, i32* @a, align 4
switch i32 %and, label %if.end [
i32 7, label %save_state_and_return
i32 0, label %save_state_and_return
]
if.end: ; preds = %sw.bb
br label %save_state_and_return
save_state_and_return: ; preds = %sw.bb, %sw.bb, %if.end, %entry
%t.0 = phi i32 [ 0, %if.end ], [ %0, %entry ], [ %0, %sw.bb ], [ %0, %sw.bb ]
%f.0 = phi i32 [ 0, %if.end ], [ %1, %entry ], [ 0, %sw.bb ], [ 0, %sw.bb ]
store i32 %t.0, i32* getelementptr inbounds (%struct.DState* @b, i32 0, i32 0), align 4
store i32 %f.0, i32* getelementptr inbounds (%struct.DState* @b, i32 0, i32 1), align 4
ret i32 undef
}