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Do not add cse-ed instructions into the visited map because we dont want to consider them as a candidate for replacement of instructions to be visited.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184966 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-06-26 16:54:53 +00:00
parent c19bd32136
commit 29acf7e03a
2 changed files with 93 additions and 5 deletions
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14
lib/Transforms/Vectorize/SLPVectorizer.cpp
View File

@ -1258,6 +1258,8 @@ Value *FuncSLP::vectorizeArith(ArrayRef<Value *> Operands) {
for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
Value *S = Builder.CreateExtractElement(Vec, Builder.getInt32(i));
Operands[i]->replaceAllUsesWith(S);
Instruction *I = cast<Instruction>(Operands[i]);
I->eraseFromParent();
}
return Vec;
@ -1280,7 +1282,7 @@ void FuncSLP::optimizeGatherSequence() {
// Check if it has a preheader.
BasicBlock *PreHeader = L->getLoopPreheader();
if (!PreHeader)
return;
continue;
// If the vector or the element that we insert into it are
// instructions that are defined in this basic block then we can't
@ -1310,17 +1312,19 @@ void FuncSLP::optimizeGatherSequence() {
if (!Insert || !GatherSeq.count(Insert))
continue;
// Check if we can replace this instruction with any of the
// visited instructions.
// Check if we can replace this instruction with any of the
// visited instructions.
for (SmallPtrSet<Instruction*, 16>::iterator v = Visited.begin(),
ve = Visited.end(); v != ve; ++v) {
if (Insert->isIdenticalTo(*v) &&
DT->dominates((*v)->getParent(), Insert->getParent())) {
DT->dominates((*v)->getParent(), Insert->getParent())) {
Insert->replaceAllUsesWith(*v);
Insert = 0;
break;
}
}
Visited.insert(Insert);
if (Insert)
Visited.insert(Insert);
}
}
}

84
test/Transforms/SLPVectorizer/X86/cse.ll
View File

@ -134,3 +134,87 @@ define i32 @test2(double* nocapture %G, i32 %k) {
ret i32 undef
}
;int foo(double *A, int n) {
; A[0] = A[0] * 7.9 * n + 6.0;
; A[1] = A[1] * 7.9 * n + 6.0;
; A[2] = A[2] * 7.9 * n + 6.0;
; A[3] = A[3] * 7.9 * n + 6.0;
;}
;CHECK: @foo4
;CHECK: insertelement <2 x double>
;CHECK: insertelement <2 x double>
;CHECK-NOT: insertelement <2 x double>
;CHECK: ret
define i32 @foo4(double* nocapture %A, i32 %n) {
entry:
%0 = load double* %A, align 8
%mul = fmul double %0, 7.900000e+00
%conv = sitofp i32 %n to double
%mul1 = fmul double %conv, %mul
%add = fadd double %mul1, 6.000000e+00
store double %add, double* %A, align 8
%arrayidx3 = getelementptr inbounds double* %A, i64 1
%1 = load double* %arrayidx3, align 8
%mul4 = fmul double %1, 7.900000e+00
%mul6 = fmul double %conv, %mul4
%add7 = fadd double %mul6, 6.000000e+00
store double %add7, double* %arrayidx3, align 8
%arrayidx9 = getelementptr inbounds double* %A, i64 2
%2 = load double* %arrayidx9, align 8
%mul10 = fmul double %2, 7.900000e+00
%mul12 = fmul double %conv, %mul10
%add13 = fadd double %mul12, 6.000000e+00
store double %add13, double* %arrayidx9, align 8
%arrayidx15 = getelementptr inbounds double* %A, i64 3
%3 = load double* %arrayidx15, align 8
%mul16 = fmul double %3, 7.900000e+00
%mul18 = fmul double %conv, %mul16
%add19 = fadd double %mul18, 6.000000e+00
store double %add19, double* %arrayidx15, align 8
ret i32 undef
}
;int partial_mrg(double *A, int n) {
; A[0] = A[0] * n;
; A[1] = A[1] * n;
; if (n < 4) return 0;
; A[2] = A[2] * n;
; A[3] = A[3] * (n+4);
;}
;CHECK: @partial_mrg
;CHECK: insertelement <2 x double>
;CHECK: insertelement <2 x double>
;CHECK: insertelement <2 x double>
;CHECK-NOT: insertelement <2 x double>
;CHECK: ret
define i32 @partial_mrg(double* nocapture %A, i32 %n) {
entry:
%0 = load double* %A, align 8
%conv = sitofp i32 %n to double
%mul = fmul double %conv, %0
store double %mul, double* %A, align 8
%arrayidx2 = getelementptr inbounds double* %A, i64 1
%1 = load double* %arrayidx2, align 8
%mul4 = fmul double %conv, %1
store double %mul4, double* %arrayidx2, align 8
%cmp = icmp slt i32 %n, 4
br i1 %cmp, label %return, label %if.end
if.end: ; preds = %entry
%arrayidx7 = getelementptr inbounds double* %A, i64 2
%2 = load double* %arrayidx7, align 8
%mul9 = fmul double %conv, %2
store double %mul9, double* %arrayidx7, align 8
%arrayidx11 = getelementptr inbounds double* %A, i64 3
%3 = load double* %arrayidx11, align 8
%add = add nsw i32 %n, 4
%conv12 = sitofp i32 %add to double
%mul13 = fmul double %conv12, %3
store double %mul13, double* %arrayidx11, align 8
br label %return
return: ; preds = %entry, %if.end
ret i32 0
}