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XCore target: fix bug in XCoreLowerThreadLocal.cpp
When a ConstantExpr which uses a thread local is part of a PHI node instruction, the insruction that replaces the ConstantExpr must be inserted in the predecessor block, in front of the terminator instruction. If the predecessor block has multiple successors, the edge is first split. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192432 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -24,6 +24,7 @@
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/NoFolder.h"
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#include "llvm/Support/ValueHandle.h"
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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#define DEBUG_TYPE "xcore-lower-thread-local"
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@ -124,32 +125,42 @@ createReplacementInstr(ConstantExpr *CE, Instruction *Instr) {
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}
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}
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static bool replaceConstantExprOp(ConstantExpr *CE) {
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static bool replaceConstantExprOp(ConstantExpr *CE, Pass *P) {
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do {
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SmallVector<WeakVH,8> WUsers;
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for (Value::use_iterator I = CE->use_begin(), E = CE->use_end();
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I != E; ++I)
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WUsers.push_back(WeakVH(*I));
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std::sort(WUsers.begin(), WUsers.end());
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WUsers.erase(std::unique(WUsers.begin(), WUsers.end()), WUsers.end());
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while (!WUsers.empty())
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if (WeakVH WU = WUsers.pop_back_val()) {
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if (Instruction *Instr = dyn_cast<Instruction>(WU)) {
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if (PHINode *PN = dyn_cast<PHINode>(WU)) {
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for (int I = 0, E = PN->getNumIncomingValues(); I < E; ++I)
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if (PN->getIncomingValue(I) == CE) {
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BasicBlock *PredBB = PN->getIncomingBlock(I);
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if (PredBB->getTerminator()->getNumSuccessors() > 1)
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PredBB = SplitEdge(PredBB, PN->getParent(), P);
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Instruction *InsertPos = PredBB->getTerminator();
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Instruction *NewInst = createReplacementInstr(CE, InsertPos);
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PN->setOperand(I, NewInst);
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}
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} else if (Instruction *Instr = dyn_cast<Instruction>(WU)) {
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Instruction *NewInst = createReplacementInstr(CE, Instr);
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assert(NewInst && "Must build an instruction\n");
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// If NewInst uses a CE being handled in an earlier recursion the
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// earlier recursion's do-while-hasNUsesOrMore(1) will run again.
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Instr->replaceUsesOfWith(CE, NewInst);
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} else {
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ConstantExpr *CExpr = dyn_cast<ConstantExpr>(WU);
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if (!CExpr || !replaceConstantExprOp(CExpr))
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if (!CExpr || !replaceConstantExprOp(CExpr, P))
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return false;
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}
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}
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} while (CE->hasNUsesOrMore(1)); // Does a recursion's NewInst use CE?
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} while (CE->hasNUsesOrMore(1)); // We need to check becasue a recursive
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// sibbling may have used 'CE' when createReplacementInstr was called.
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CE->destroyConstant();
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return true;
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}
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static bool rewriteNonInstructionUses(GlobalVariable *GV) {
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static bool rewriteNonInstructionUses(GlobalVariable *GV, Pass *P) {
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SmallVector<WeakVH,8> WUsers;
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for (Value::use_iterator I = GV->use_begin(), E = GV->use_end(); I != E; ++I)
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if (!isa<Instruction>(*I))
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@ -157,7 +168,7 @@ static bool rewriteNonInstructionUses(GlobalVariable *GV) {
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while (!WUsers.empty())
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if (WeakVH WU = WUsers.pop_back_val()) {
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ConstantExpr *CE = dyn_cast<ConstantExpr>(WU);
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if (!CE || !replaceConstantExprOp(CE))
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if (!CE || !replaceConstantExprOp(CE, P))
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return false;
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}
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return true;
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@ -175,7 +186,7 @@ bool XCoreLowerThreadLocal::lowerGlobal(GlobalVariable *GV) {
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return false;
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// Skip globals that we can't lower and leave it for the backend to error.
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if (!rewriteNonInstructionUses(GV) ||
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if (!rewriteNonInstructionUses(GV, this) ||
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!GV->getType()->isSized() || isZeroLengthArray(GV->getType()))
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return false;
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@ -1,4 +1,5 @@
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; RUN: llc -march=xcore < %s | FileCheck %s
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; RUN: llc -march=xcore -O=0 < %s | FileCheck %s -check-prefix=PHINODE
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declare i8 addrspace(1)* @llvm.xcore.getst.p1i8.p1i8(i8 addrspace(1)* %r)
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declare void @llvm.xcore.msync.p1i8(i8 addrspace(1)* %r)
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@ -102,5 +103,43 @@ define i32 @f_tlExpr () {
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i32 ptrtoint( i32* getelementptr inbounds ([2 x i32]* @tle, i32 0, i32 0) to i32))
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}
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define void @phiNode1() {
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; N.B. lowering of duplicate constexpr in a PHI node requires -O=0
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; PHINODE-LABEL: phiNode1:
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; PHINODE: get r11, id
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; PHINODE-LABEL: .LBB11_1:
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; PHINODE: get r11, id
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; PHINODE: bu .LBB11_1
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entry:
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br label %ConstantExpPhiNode
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ConstantExpPhiNode:
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%ptr = phi i32* [ getelementptr inbounds ([3 x i32]* @tl, i32 0, i32 0), %entry ],
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[ getelementptr inbounds ([3 x i32]* @tl, i32 0, i32 0), %ConstantExpPhiNode ]
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br label %ConstantExpPhiNode
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exit:
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ret void
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}
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define void @phiNode2( i1 %bool) {
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; N.B. check an extra 'Node_crit_edge' (LBB12_1) is inserted
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; PHINODE-LABEL: phiNode2:
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; PHINODE: bf {{r[0-9]}}, .LBB12_3
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; PHINODE: bu .LBB12_1
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; PHINODE-LABEL: .LBB12_1:
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; PHINODE: get r11, id
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; PHINODE-LABEL: .LBB12_2:
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; PHINODE: get r11, id
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; PHINODE: bu .LBB12_2
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; PHINODE-LABEL: .LBB12_3:
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entry:
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br i1 %bool, label %ConstantExpPhiNode, label %exit
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ConstantExpPhiNode:
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%ptr = phi i32* [ getelementptr inbounds ([3 x i32]* @tl, i32 0, i32 0), %entry ],
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[ getelementptr inbounds ([3 x i32]* @tl, i32 0, i32 0), %ConstantExpPhiNode ]
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br label %ConstantExpPhiNode
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exit:
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ret void
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}
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; CHECK-LABEL: tl:
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; CHECK: .space 96
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