dragonegg self-host build. I reverted 96640 in order to revert
96556 (96640 goes on top of 96556), but it also looks like with
both of them applied the breakage happens even earlier. The
symptom of the 96556 miscompile is the following crash:
llvm[3]: Compiling AlphaISelLowering.cpp for Release build
cc1plus: /home/duncan/tmp/tmp/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:4982: void llvm::SelectionDAG::ReplaceAllUsesWith(llvm::SDNode*, llvm::SDNode*, llvm::SelectionDAG::DAGUpdateListener*): Assertion `(!From->hasAnyUseOfValue(i) || From->getValueType(i) == To->getValueType(i)) && "Cannot use this version of ReplaceAllUsesWith!"' failed.
Stack dump:
0. Running pass 'X86 DAG->DAG Instruction Selection' on function '@_ZN4llvm19AlphaTargetLowering14LowerOperationENS_7SDValueERNS_12SelectionDAGE'
g++: Internal error: Aborted (program cc1plus)
This occurs when building LLVM using LLVM built by LLVM (via
dragonegg). Probably LLVM has miscompiled itself, though it
may have miscompiled GCC and/or dragonegg itself: at this point
of the self-host build, all of GCC, LLVM and dragonegg were built
using LLVM. Unfortunately this kind of thing is extremely hard
to debug, and while I did rummage around a bit I didn't find any
smoking guns, aka obviously miscompiled code.
Found by bisection.
r96556 | evancheng | 2010-02-18 03:13:50 +0100 (Thu, 18 Feb 2010) | 5 lines
Some dag combiner goodness:
Transform br (xor (x, y)) -> br (x != y)
Transform br (xor (xor (x,y), 1)) -> br (x == y)
Also normalize (and (X, 1) == / != 1 -> (and (X, 1)) != / == 0 to match to "test on x86" and "tst on arm"
r96640 | evancheng | 2010-02-19 01:34:39 +0100 (Fri, 19 Feb 2010) | 16 lines
Transform (xor (setcc), (setcc)) == / != 1 to
(xor (setcc), (setcc)) != / == 1.
e.g. On x86_64
%0 = icmp eq i32 %x, 0
%1 = icmp eq i32 %y, 0
%2 = xor i1 %1, %0
br i1 %2, label %bb, label %return
=>
testl %edi, %edi
sete %al
testl %esi, %esi
sete %cl
cmpb %al, %cl
je LBB1_2
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96672
91177308-0d34-0410-b5e6-
96231b3b80d8
DAG.DeleteNode(Trunc);
}
// Replace the uses of SRL with SETCC
- WorkListRemover DeadNodes(*this);
- DAG.ReplaceAllUsesOfValueWith(N1, SetCC, &DeadNodes);
+ DAG.ReplaceAllUsesOfValueWith(N1, SetCC);
removeFromWorkList(N1.getNode());
DAG.DeleteNode(N1.getNode());
return SDValue(N, 0); // Return N so it doesn't get rechecked!
}
}
}
-
- // Transform br(xor(x, y)) -> br(x != y)
- // Transform br(xor(xor(x,y), 1)) -> br (x == y)
- if (N1.hasOneUse() && N1.getOpcode() == ISD::XOR) {
- SDNode *TheXor = N1.getNode();
- SDValue Op0 = TheXor->getOperand(0);
- SDValue Op1 = TheXor->getOperand(1);
- if (Op0.getOpcode() == Op1.getOpcode()) {
- // Avoid missing important xor optimizations.
- SDValue Tmp = visitXOR(TheXor);
- if (Tmp.getNode()) {
- DEBUG(dbgs() << "\nReplacing.8 ";
- TheXor->dump(&DAG);
- dbgs() << "\nWith: ";
- Tmp.getNode()->dump(&DAG);
- dbgs() << '\n');
- WorkListRemover DeadNodes(*this);
- DAG.ReplaceAllUsesOfValueWith(N1, Tmp, &DeadNodes);
- removeFromWorkList(TheXor);
- DAG.DeleteNode(TheXor);
- return DAG.getNode(ISD::BRCOND, N->getDebugLoc(),
- MVT::Other, Chain, Tmp, N2);
- }
- }
-
- if (Op0.getOpcode() != ISD::SETCC && Op1.getOpcode() != ISD::SETCC) {
- bool Equal = false;
- if (ConstantSDNode *RHSCI = dyn_cast<ConstantSDNode>(Op0))
- if (RHSCI->getAPIntValue() == 1 && Op0.hasOneUse() &&
- Op0.getOpcode() == ISD::XOR) {
- TheXor = Op0.getNode();
- Equal = true;
- }
-
- SDValue SetCC = DAG.getSetCC(TheXor->getDebugLoc(),
- TLI.getSetCCResultType(N1.getValueType()),
- Op0, Op1,
- Equal ? ISD::SETEQ : ISD::SETNE);
- // Replace the uses of XOR with SETCC
- WorkListRemover DeadNodes(*this);
- DAG.ReplaceAllUsesOfValueWith(N1, SetCC, &DeadNodes);
- removeFromWorkList(N1.getNode());
- DAG.DeleteNode(N1.getNode());
- return DAG.getNode(ISD::BRCOND, N->getDebugLoc(),
- MVT::Other, Chain, SetCC, N2);
- }
- }
return SDValue();
}
assert(N->getValueType(2) == MVT::Other && "Malformed indexed loads?");
if (N->hasNUsesOfValue(0, 0) && N->hasNUsesOfValue(0, 1)) {
SDValue Undef = DAG.getUNDEF(N->getValueType(0));
- DEBUG(dbgs() << "\nReplacing.7 ";
+ DEBUG(dbgs() << "\nReplacing.6 ";
N->dump(&DAG);
dbgs() << "\nWith: ";
Undef.getNode()->dump(&DAG);
break; // todo, be more careful with signed comparisons
}
} else if (N0.getOpcode() == ISD::SIGN_EXTEND_INREG &&
- (Cond == ISD::SETEQ || Cond == ISD::SETNE)) {
+ (Cond == ISD::SETEQ || Cond == ISD::SETNE)) {
EVT ExtSrcTy = cast<VTSDNode>(N0.getOperand(1))->getVT();
unsigned ExtSrcTyBits = ExtSrcTy.getSizeInBits();
EVT ExtDstTy = N0.getValueType();
Cond);
} else if ((N1C->isNullValue() || N1C->getAPIntValue() == 1) &&
(Cond == ISD::SETEQ || Cond == ISD::SETNE)) {
+
// SETCC (SETCC), [0|1], [EQ|NE] -> SETCC
if (N0.getOpcode() == ISD::SETCC) {
bool TrueWhenTrue = (Cond == ISD::SETEQ) ^ (N1C->getAPIntValue() != 1);
N0.getOperand(0).getValueType().isInteger());
return DAG.getSetCC(dl, VT, N0.getOperand(0), N0.getOperand(1), CC);
}
-
+
if ((N0.getOpcode() == ISD::XOR ||
- (N0.getOpcode() == ISD::AND &&
+ (N0.getOpcode() == ISD::AND &&
N0.getOperand(0).getOpcode() == ISD::XOR &&
N0.getOperand(1) == N0.getOperand(0).getOperand(1))) &&
isa<ConstantSDNode>(N0.getOperand(1)) &&
N0.getOperand(0).getOperand(0),
N0.getOperand(1));
}
-
return DAG.getSetCC(dl, VT, Val, N1,
Cond == ISD::SETEQ ? ISD::SETNE : ISD::SETEQ);
}
- } else if (N1C->getAPIntValue() == 1) {
- // If this is (X&1) == / != 1, normalize it to (X&1) != / == 0.
- SDValue Op0 = N0;
- if (Op0.getOpcode() == ISD::TRUNCATE)
- Op0 = Op0.getOperand(0);
-
- if ((Op0.getOpcode() == ISD::XOR || Op0.getOpcode() == ISD::AND) &&
- Op0.getOperand(0).getOpcode() == ISD::SETCC &&
- Op0.getOperand(1).getOpcode() == ISD::SETCC) {
- // (and (setcc), (setcc)) == / != 1 -> (setcc) == / != (setcc)
- // (xor (setcc), (setcc)) == / != 1 -> (setcc) != / == (setcc)
- if (Op0.getOpcode() == ISD::XOR)
- Cond = (Cond == ISD::SETEQ) ? ISD::SETNE : ISD::SETEQ;
- return DAG.getSetCC(dl, VT, Op0.getOperand(0), Op0.getOperand(1),
- Cond);
- } else if (Op0.getOpcode() == ISD::AND &&
- isa<ConstantSDNode>(Op0.getOperand(1)) &&
- cast<ConstantSDNode>(Op0.getOperand(1))->getAPIntValue() == 1) {
- if (Op0.getValueType() != VT)
- Op0 = DAG.getNode(ISD::AND, dl, VT,
- DAG.getNode(ISD::TRUNCATE, dl, VT, Op0.getOperand(0)),
- DAG.getConstant(1, VT));
- return DAG.getSetCC(dl, VT, Op0,
- DAG.getConstant(0, Op0.getValueType()),
- Cond == ISD::SETEQ ? ISD::SETNE : ISD::SETEQ);
- }
}
}
/// LowerToBT - Result of 'and' is compared against zero. Turn it into a BT node
/// if it's possible.
-static SDValue LowerToBT(SDValue And, ISD::CondCode CC,
+static SDValue LowerToBT(SDValue Op0, ISD::CondCode CC,
DebugLoc dl, SelectionDAG &DAG) {
- SDValue Op0 = And.getOperand(0);
- SDValue Op1 = And.getOperand(1);
- if (Op0.getOpcode() == ISD::TRUNCATE)
- Op0 = Op0.getOperand(0);
- if (Op1.getOpcode() == ISD::TRUNCATE)
- Op1 = Op1.getOperand(0);
-
SDValue LHS, RHS;
- if (Op1.getOpcode() == ISD::SHL) {
- if (ConstantSDNode *And10C = dyn_cast<ConstantSDNode>(Op1.getOperand(0)))
- if (And10C->getZExtValue() == 1) {
- LHS = Op0;
- RHS = Op1.getOperand(1);
+ if (Op0.getOperand(1).getOpcode() == ISD::SHL) {
+ if (ConstantSDNode *Op010C =
+ dyn_cast<ConstantSDNode>(Op0.getOperand(1).getOperand(0)))
+ if (Op010C->getZExtValue() == 1) {
+ LHS = Op0.getOperand(0);
+ RHS = Op0.getOperand(1).getOperand(1);
}
- } else if (Op0.getOpcode() == ISD::SHL) {
- if (ConstantSDNode *And00C = dyn_cast<ConstantSDNode>(Op0.getOperand(0)))
- if (And00C->getZExtValue() == 1) {
- LHS = Op1;
- RHS = Op0.getOperand(1);
+ } else if (Op0.getOperand(0).getOpcode() == ISD::SHL) {
+ if (ConstantSDNode *Op000C =
+ dyn_cast<ConstantSDNode>(Op0.getOperand(0).getOperand(0)))
+ if (Op000C->getZExtValue() == 1) {
+ LHS = Op0.getOperand(1);
+ RHS = Op0.getOperand(0).getOperand(1);
}
- } else if (Op1.getOpcode() == ISD::Constant) {
- ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op1);
- SDValue AndLHS = Op0;
+ } else if (Op0.getOperand(1).getOpcode() == ISD::Constant) {
+ ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op0.getOperand(1));
+ SDValue AndLHS = Op0.getOperand(0);
if (AndRHS->getZExtValue() == 1 && AndLHS.getOpcode() == ISD::SRL) {
LHS = AndLHS.getOperand(0);
RHS = AndLHS.getOperand(1);
return NewSetCC;
}
- // Look for "(setcc) == / != 1" to avoid unncessary setcc.
- if (Op0.getOpcode() == X86ISD::SETCC &&
- Op1.getOpcode() == ISD::Constant &&
- cast<ConstantSDNode>(Op1)->getZExtValue() == 1 &&
- (CC == ISD::SETEQ || CC == ISD::SETNE)) {
- X86::CondCode CCode = (X86::CondCode)Op0.getConstantOperandVal(0);
- CCode = X86::GetOppositeBranchCondition(CCode);
- return DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
- DAG.getConstant(CCode, MVT::i8), Op0.getOperand(1));
- }
-
bool isFP = Op.getOperand(1).getValueType().isFloatingPoint();
unsigned X86CC = TranslateX86CC(CC, isFP, Op0, Op1, DAG);
if (X86CC == X86::COND_INVALID)
-; RUN: llc < %s -mtriple=i386-apple-darwin -stats -info-output-file - | grep asm-printer | grep 29
+; RUN: llc < %s -mtriple=i386-apple-darwin -tailcallopt=false -stats -info-output-file - | grep asm-printer | grep 31
%CC = type { %Register }
%II = type { %"struct.XX::II::$_74" }
-; RUN: llc < %s -march=x86-64 | grep mov | count 3
+; RUN: llc < %s -march=x86-64 | grep mov | count 5
%struct.COMPOSITE = type { i8, i16, i16 }
%struct.FILE = type { i8*, i32, i32, i16, i16, %struct.__sbuf, i32, i8*, i32 (i8*)*, i32 (i8*, i8*, i32)*, i64 (i8*, i64, i32)*, i32 (i8*, i8*, i32)*, %struct.__sbuf, %struct.__sFILEX*, i32, [3 x i8], [1 x i8], %struct.__sbuf, i32, i64 }
; value and as the operand of a branch.
; RUN: llc < %s -march=x86 | FileCheck %s
-define i1 @test1(i32 %X) zeroext nounwind {
+define i1 @test1(i32 %X) zeroext {
%Y = trunc i32 %X to i1
ret i1 %Y
}
-; CHECK: test1:
; CHECK: andl $1, %eax
-define i1 @test2(i32 %val, i32 %mask) nounwind {
+define i1 @test2(i32 %val, i32 %mask) {
entry:
%shifted = ashr i32 %val, %mask
%anded = and i32 %shifted, 1
ret_false:
ret i1 false
}
-; CHECK: test2:
-; CHECK: btl %eax
+; CHECK: testb $1, %al
-define i32 @test3(i8* %ptr) nounwind {
+define i32 @test3(i8* %ptr) {
%val = load i8* %ptr
%tmp = trunc i8 %val to i1
br i1 %tmp, label %cond_true, label %cond_false
cond_false:
ret i32 42
}
-; CHECK: test3:
-; CHECK: testb $1, (%eax)
+; CHECK: testb $1, %al
-define i32 @test4(i8* %ptr) nounwind {
+define i32 @test4(i8* %ptr) {
%tmp = ptrtoint i8* %ptr to i1
br i1 %tmp, label %cond_true, label %cond_false
cond_true:
cond_false:
ret i32 42
}
-; CHECK: test4:
-; CHECK: testb $1, 4(%esp)
+; CHECK: testb $1, %al
-define i32 @test5(double %d) nounwind {
+define i32 @test6(double %d) {
%tmp = fptosi double %d to i1
br i1 %tmp, label %cond_true, label %cond_false
cond_true:
cond_false:
ret i32 42
}
-; CHECK: test5:
; CHECK: testb $1
; RUN: llc < %s -march=x86 | FileCheck %s -check-prefix=X32
; RUN: llc < %s -march=x86-64 | FileCheck %s -check-prefix=X64
-; rdar://7367229
define i32 @t(i32 %a, i32 %b) nounwind ssp {
entry:
declare i32 @foo(...)
declare i32 @bar(...)
-
-define i32 @t2(i32 %x, i32 %y) nounwind ssp {
-; X32: t2:
-; X32: cmpl
-; X32: sete
-; X32: cmpl
-; X32: sete
-; X32-NOT: xor
-; X32: je
-
-; X64: t2:
-; X64: testl
-; X64: sete
-; X64: testl
-; X64: sete
-; X64-NOT: xor
-; X64: je
-entry:
- %0 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
- %1 = icmp eq i32 %y, 0 ; <i1> [#uses=1]
- %2 = xor i1 %1, %0 ; <i1> [#uses=1]
- br i1 %2, label %bb, label %return
-
-bb: ; preds = %entry
- %3 = tail call i32 (...)* @foo() nounwind ; <i32> [#uses=0]
- ret i32 undef
-
-return: ; preds = %entry
- ret i32 undef
-}
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