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[FIX] Determine insertion point during SCEV expansion

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llvm-svn: 271892
This commit is contained in:
Johannes Doerfert 2016-06-06 13:05:21 +00:00
parent edafb0595e
commit 4db8d80730
2 changed files with 56 additions and 5 deletions
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18
polly/lib/Support/ScopHelper.cpp
View File

@ -280,11 +280,19 @@ private:
return visit(NewE); return visit(NewE);
} }
Instruction *StartIP = R.getEnteringBlock()->getTerminator(); auto *EnteringBB = R.getEnteringBlock();
Instruction *Inst = dyn_cast<Instruction>(E->getValue()); Instruction *Inst = dyn_cast<Instruction>(E->getValue());
Instruction *IP;
if (Inst && !R.contains(Inst))
IP = Inst;
else if (Inst && EnteringBB->getParent() == Inst->getFunction())
IP = EnteringBB->getTerminator();
else
IP = EnteringBB->getParent()->getEntryBlock().getTerminator();
if (!Inst || (Inst->getOpcode() != Instruction::SRem && if (!Inst || (Inst->getOpcode() != Instruction::SRem &&
Inst->getOpcode() != Instruction::SDiv)) Inst->getOpcode() != Instruction::SDiv))
return visitGenericInst(E, Inst, StartIP); return visitGenericInst(E, Inst, IP);
const SCEV *LHSScev = SE.getSCEV(Inst->getOperand(0)); const SCEV *LHSScev = SE.getSCEV(Inst->getOperand(0));
const SCEV *RHSScev = SE.getSCEV(Inst->getOperand(1)); const SCEV *RHSScev = SE.getSCEV(Inst->getOperand(1));
@ -292,11 +300,11 @@ private:
if (!SE.isKnownNonZero(RHSScev)) if (!SE.isKnownNonZero(RHSScev))
RHSScev = SE.getUMaxExpr(RHSScev, SE.getConstant(E->getType(), 1)); RHSScev = SE.getUMaxExpr(RHSScev, SE.getConstant(E->getType(), 1));
Value *LHS = expandCodeFor(LHSScev, E->getType(), StartIP); Value *LHS = expandCodeFor(LHSScev, E->getType(), IP);
Value *RHS = expandCodeFor(RHSScev, E->getType(), StartIP); Value *RHS = expandCodeFor(RHSScev, E->getType(), IP);
Inst = BinaryOperator::Create((Instruction::BinaryOps)Inst->getOpcode(), Inst = BinaryOperator::Create((Instruction::BinaryOps)Inst->getOpcode(),
LHS, RHS, Inst->getName() + Name, StartIP); LHS, RHS, Inst->getName() + Name, IP);
return SE.getSCEV(Inst); return SE.getSCEV(Inst);
} }

43
polly/test/Isl/CodeGen/scop_expander_insert_point.ll Normal file
View File

@ -0,0 +1,43 @@
; RUN: opt %loadPolly -polly-codegen -S < %s | FileCheck %s
;
; CHECK: entry:
; CHECK-NEXT: %outvalue.141.phiops = alloca i64
; CHECK-NEXT: %.preload.s2a = alloca i8
; CHECK-NEXT: %divpolly = sdiv i32 undef, 1
; CHECK-NEXT: %div = sdiv i32 undef, undef
;
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
; Function Attrs: nounwind uwtable
define void @int_downsample() #0 {
entry:
%div = sdiv i32 undef, undef
br label %for.cond10.preheader.lr.ph
for.cond10.preheader.lr.ph: ; preds = %entry
br label %for.body17.lr.ph
for.body17.lr.ph: ; preds = %for.end22, %for.cond10.preheader.lr.ph
%outcol_h.048 = phi i32 [ 0, %for.cond10.preheader.lr.ph ], [ %add31, %for.end22 ]
%0 = load i8*, i8** undef
%idx.ext = zext i32 %outcol_h.048 to i64
%add.ptr = getelementptr inbounds i8, i8* %0, i64 %idx.ext
br label %for.body17
for.body17: ; preds = %for.body17, %for.body17.lr.ph
%outvalue.141 = phi i64 [ undef, %for.body17.lr.ph ], [ %add19, %for.body17 ]
%inptr.040 = phi i8* [ %add.ptr, %for.body17.lr.ph ], [ undef, %for.body17 ]
%1 = load i8, i8* %inptr.040
%add19 = add nsw i64 0, %outvalue.141
br i1 false, label %for.body17, label %for.end22
for.end22: ; preds = %for.body17
%add31 = add i32 %outcol_h.048, %div
br i1 undef, label %for.body17.lr.ph, label %for.end32
for.end32: ; preds = %for.end22
br label %for.end36
for.end36: ; preds = %for.end32
ret void
}