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Re-apply r286384, "X86: Introduce the "relocImm" ComplexPattern, which represents a relocatable immediate.", with a fix for 32-bit x86.

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Teach X86InstrInfo::analyzeCompare() not to crash on CMP and SUB instructions
that take a global address operand.

llvm-svn: 286420
This commit is contained in:
Peter Collingbourne 2016-11-09 23:53:43 +00:00
parent 391ac08575
commit 53c709eaaf
9 changed files with 73 additions and 60 deletions
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4
include/llvm/Target/TargetSelectionDAG.td
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@ -1165,10 +1165,12 @@ class Pat<dag pattern, dag result> : Pattern<pattern, [result]>;
// e.g. X86 addressing mode - def addr : ComplexPattern<4, "SelectAddr", [add]>;
//
class ComplexPattern<ValueType ty, int numops, string fn,
list<SDNode> roots = [], list<SDNodeProperty> props = []> {
list<SDNode> roots = [], list<SDNodeProperty> props = [],
int complexity = -1> {
ValueType Ty = ty;
int NumOperands = numops;
string SelectFunc = fn;
list<SDNode> RootNodes = roots;
list<SDNodeProperty> Properties = props;
int Complexity = complexity;
}

22
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -228,6 +228,7 @@ namespace {
SDValue &Index, SDValue &Disp,
SDValue &Segment,
SDValue &NodeWithChain);
bool selectRelocImm(SDValue N, SDValue &Op);
bool tryFoldLoad(SDNode *P, SDValue N,
SDValue &Base, SDValue &Scale,
@ -1704,6 +1705,27 @@ bool X86DAGToDAGISel::selectTLSADDRAddr(SDValue N, SDValue &Base,
return true;
}
bool X86DAGToDAGISel::selectRelocImm(SDValue N, SDValue &Op) {
if (auto *CN = dyn_cast<ConstantSDNode>(N)) {
Op = CurDAG->getTargetConstant(CN->getAPIntValue(), SDLoc(CN),
N.getValueType());
return true;
}
if (N.getOpcode() != X86ISD::Wrapper)
return false;
unsigned Opc = N.getOperand(0)->getOpcode();
if (Opc == ISD::TargetConstantPool || Opc == ISD::TargetJumpTable ||
Opc == ISD::TargetExternalSymbol || Opc == ISD::TargetGlobalAddress ||
Opc == ISD::TargetGlobalTLSAddress || Opc == ISD::MCSymbol ||
Opc == ISD::TargetBlockAddress) {
Op = N.getOperand(0);
return true;
}
return false;
}
bool X86DAGToDAGISel::tryFoldLoad(SDNode *P, SDValue N,
SDValue &Base, SDValue &Scale,

47
lib/Target/X86/X86InstrCompiler.td
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@ -1025,53 +1025,6 @@ def : Pat<(store (i32 -1), addr:$dst), (OR32mi8 addr:$dst, -1)>;
def : Pat<(store (i64 -1), addr:$dst), (OR64mi8 addr:$dst, -1)>;
}
// ConstantPool GlobalAddress, ExternalSymbol, and JumpTable
def : Pat<(i32 (X86Wrapper tconstpool :$dst)), (MOV32ri tconstpool :$dst)>;
def : Pat<(i32 (X86Wrapper tjumptable :$dst)), (MOV32ri tjumptable :$dst)>;
def : Pat<(i32 (X86Wrapper tglobaltlsaddr:$dst)),(MOV32ri tglobaltlsaddr:$dst)>;
def : Pat<(i32 (X86Wrapper tglobaladdr :$dst)), (MOV32ri tglobaladdr :$dst)>;
def : Pat<(i32 (X86Wrapper texternalsym:$dst)), (MOV32ri texternalsym:$dst)>;
def : Pat<(i32 (X86Wrapper mcsym:$dst)), (MOV32ri mcsym:$dst)>;
def : Pat<(i32 (X86Wrapper tblockaddress:$dst)), (MOV32ri tblockaddress:$dst)>;
def : Pat<(add GR32:$src1, (X86Wrapper tconstpool:$src2)),
(ADD32ri GR32:$src1, tconstpool:$src2)>;
def : Pat<(add GR32:$src1, (X86Wrapper tjumptable:$src2)),
(ADD32ri GR32:$src1, tjumptable:$src2)>;
def : Pat<(add GR32:$src1, (X86Wrapper tglobaladdr :$src2)),
(ADD32ri GR32:$src1, tglobaladdr:$src2)>;
def : Pat<(add GR32:$src1, (X86Wrapper texternalsym:$src2)),
(ADD32ri GR32:$src1, texternalsym:$src2)>;
def : Pat<(add GR32:$src1, (X86Wrapper mcsym:$src2)),
(ADD32ri GR32:$src1, mcsym:$src2)>;
def : Pat<(add GR32:$src1, (X86Wrapper tblockaddress:$src2)),
(ADD32ri GR32:$src1, tblockaddress:$src2)>;
def : Pat<(store (i32 (X86Wrapper tglobaladdr:$src)), addr:$dst),
(MOV32mi addr:$dst, tglobaladdr:$src)>;
def : Pat<(store (i32 (X86Wrapper texternalsym:$src)), addr:$dst),
(MOV32mi addr:$dst, texternalsym:$src)>;
def : Pat<(store (i32 (X86Wrapper mcsym:$src)), addr:$dst),
(MOV32mi addr:$dst, mcsym:$src)>;
def : Pat<(store (i32 (X86Wrapper tblockaddress:$src)), addr:$dst),
(MOV32mi addr:$dst, tblockaddress:$src)>;
// ConstantPool GlobalAddress, ExternalSymbol, and JumpTable when not in small
// code model mode, should use 'movabs'. FIXME: This is really a hack, the
// 'movabs' predicate should handle this sort of thing.
def : Pat<(i64 (X86Wrapper tconstpool :$dst)),
(MOV64ri tconstpool :$dst)>, Requires<[FarData]>;
def : Pat<(i64 (X86Wrapper tjumptable :$dst)),
(MOV64ri tjumptable :$dst)>, Requires<[FarData]>;
def : Pat<(i64 (X86Wrapper tglobaladdr :$dst)),
(MOV64ri tglobaladdr :$dst)>, Requires<[FarData]>;
def : Pat<(i64 (X86Wrapper texternalsym:$dst)),
(MOV64ri texternalsym:$dst)>, Requires<[FarData]>;
def : Pat<(i64 (X86Wrapper mcsym:$dst)),
(MOV64ri mcsym:$dst)>, Requires<[FarData]>;
def : Pat<(i64 (X86Wrapper tblockaddress:$dst)),
(MOV64ri tblockaddress:$dst)>, Requires<[FarData]>;
// In kernel code model, we can get the address of a label
// into a register with 'movq'. FIXME: This is a hack, the 'imm' predicate of
// the MOV64ri32 should accept these.

4
lib/Target/X86/X86InstrInfo.cpp
View File

@ -5303,6 +5303,8 @@ bool X86InstrInfo::analyzeCompare(const MachineInstr &MI, unsigned &SrcReg,
case X86::CMP16ri:
case X86::CMP16ri8:
case X86::CMP8ri:
if (!MI.getOperand(1).isImm())
return false;
SrcReg = MI.getOperand(0).getReg();
SrcReg2 = 0;
CmpMask = ~0;
@ -5334,6 +5336,8 @@ bool X86InstrInfo::analyzeCompare(const MachineInstr &MI, unsigned &SrcReg,
case X86::SUB16ri:
case X86::SUB16ri8:
case X86::SUB8ri:
if (!MI.getOperand(2).isImm())
return false;
SrcReg = MI.getOperand(1).getReg();
SrcReg2 = 0;
CmpMask = ~0;

14
lib/Target/X86/X86InstrInfo.td
View File

@ -765,6 +765,12 @@ def tls64baseaddr : ComplexPattern<i64, 5, "selectTLSADDRAddr",
def vectoraddr : ComplexPattern<iPTR, 5, "selectVectorAddr", [],[SDNPWantParent]>;
// A relocatable immediate is either an immediate operand or an operand that can
// be relocated by the linker to an immediate, such as a regular symbol in
// non-PIC code.
def relocImm : ComplexPattern<iAny, 1, "selectRelocImm", [imm, X86Wrapper], [],
0>;
//===----------------------------------------------------------------------===//
// X86 Instruction Predicate Definitions.
def TruePredicate : Predicate<"true">;
@ -877,8 +883,6 @@ def IsNaCl : Predicate<"Subtarget->isTargetNaCl()">;
def NotNaCl : Predicate<"!Subtarget->isTargetNaCl()">;
def SmallCode : Predicate<"TM.getCodeModel() == CodeModel::Small">;
def KernelCode : Predicate<"TM.getCodeModel() == CodeModel::Kernel">;
def FarData : Predicate<"TM.getCodeModel() != CodeModel::Small &&"
"TM.getCodeModel() != CodeModel::Kernel">;
def NearData : Predicate<"TM.getCodeModel() == CodeModel::Small ||"
"TM.getCodeModel() == CodeModel::Kernel">;
def IsNotPIC : Predicate<"!TM.isPositionIndependent()">;
@ -950,7 +954,7 @@ def imm8_su : PatLeaf<(i8 imm), [{
def imm16_su : PatLeaf<(i16 imm), [{
return !shouldAvoidImmediateInstFormsForSize(N);
}]>;
def imm32_su : PatLeaf<(i32 imm), [{
def imm32_su : PatLeaf<(i32 relocImm), [{
return !shouldAvoidImmediateInstFormsForSize(N);
}]>;
def i64immSExt32_su : PatLeaf<(i64immSExt32), [{
@ -1380,7 +1384,7 @@ def MOV16ri : Ii16<0xB8, AddRegFrm, (outs GR16:$dst), (ins i16imm:$src),
[(set GR16:$dst, imm:$src)], IIC_MOV>, OpSize16;
def MOV32ri : Ii32<0xB8, AddRegFrm, (outs GR32:$dst), (ins i32imm:$src),
"mov{l}\t{$src, $dst|$dst, $src}",
[(set GR32:$dst, imm:$src)], IIC_MOV>, OpSize32;
[(set GR32:$dst, relocImm:$src)], IIC_MOV>, OpSize32;
def MOV64ri32 : RIi32S<0xC7, MRM0r, (outs GR64:$dst), (ins i64i32imm:$src),
"mov{q}\t{$src, $dst|$dst, $src}",
[(set GR64:$dst, i64immSExt32:$src)], IIC_MOV>;
@ -1388,7 +1392,7 @@ def MOV64ri32 : RIi32S<0xC7, MRM0r, (outs GR64:$dst), (ins i64i32imm:$src),
let isReMaterializable = 1 in {
def MOV64ri : RIi64<0xB8, AddRegFrm, (outs GR64:$dst), (ins i64imm:$src),
"movabs{q}\t{$src, $dst|$dst, $src}",
[(set GR64:$dst, imm:$src)], IIC_MOV>;
[(set GR64:$dst, relocImm:$src)], IIC_MOV>;
}
// Longer forms that use a ModR/M byte. Needed for disassembler

22
test/CodeGen/X86/compare-global.ll Normal file
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@ -0,0 +1,22 @@
; RUN: llc -o - %s | FileCheck %s
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-msvc18.0.0"
@foo = external global i8
define void @f(i8* %c) {
entry:
; CHECK: subl $_foo, %eax
%cmp = icmp eq i8* %c, @foo
br i1 %cmp, label %if.then, label %if.end
if.then:
tail call void @g()
br label %if.end
if.end:
ret void
}
declare void @g()

7
utils/TableGen/CodeGenDAGPatterns.cpp
View File

@ -805,14 +805,9 @@ static unsigned getPatternSize(const TreePatternNode *P,
if (P->isLeaf() && isa<IntInit>(P->getLeafValue()))
Size += 2;
// FIXME: This is a hack to statically increase the priority of patterns
// which maps a sub-dag to a complex pattern. e.g. favors LEA over ADD.
// Later we can allow complexity / cost for each pattern to be (optionally)
// specified. To get best possible pattern match we'll need to dynamically
// calculate the complexity of all patterns a dag can potentially map to.
const ComplexPattern *AM = P->getComplexPatternInfo(CGP);
if (AM) {
Size += AM->getNumOperands() * 3;
Size += AM->getComplexity();
// We don't want to count any children twice, so return early.
return Size;

10
utils/TableGen/CodeGenTarget.cpp
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@ -393,6 +393,16 @@ ComplexPattern::ComplexPattern(Record *R) {
SelectFunc = R->getValueAsString("SelectFunc");
RootNodes = R->getValueAsListOfDefs("RootNodes");
// FIXME: This is a hack to statically increase the priority of patterns which
// maps a sub-dag to a complex pattern. e.g. favors LEA over ADD. To get best
// possible pattern match we'll need to dynamically calculate the complexity
// of all patterns a dag can potentially map to.
int64_t RawComplexity = R->getValueAsInt("Complexity");
if (RawComplexity == -1)
Complexity = NumOperands * 3;
else
Complexity = RawComplexity;
// Parse the properties.
Properties = 0;
std::vector<Record*> PropList = R->getValueAsListOfDefs("Properties");

3
utils/TableGen/CodeGenTarget.h
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@ -196,8 +196,8 @@ class ComplexPattern {
std::string SelectFunc;
std::vector<Record*> RootNodes;
unsigned Properties; // Node properties
unsigned Complexity;
public:
ComplexPattern() : NumOperands(0) {}
ComplexPattern(Record *R);
MVT::SimpleValueType getValueType() const { return Ty; }
@ -207,6 +207,7 @@ public:
return RootNodes;
}
bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
unsigned getComplexity() const { return Complexity; }
};
} // End llvm namespace