[llvm-commits] [llvm] r76441 - in /llvm/trunk: include/llvm/Target/TargetLowering.h lib/Target/X86/X86ISelLowering.cpp lib/Target/X86/X86ISelLowering.h
Chris Lattner
sabre at nondot.org
Mon Jul 20 10:51:36 PDT 2009
Author: lattner
Date: Mon Jul 20 12:51:36 2009
New Revision: 76441
URL: http://llvm.org/viewvc/llvm-project?rev=76441&view=rev
Log:
Copy ExpandInlineAsm to TargetLowering from TargetAsmInfo.
Modified:
llvm/trunk/include/llvm/Target/TargetLowering.h
llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
llvm/trunk/lib/Target/X86/X86ISelLowering.h
Modified: llvm/trunk/include/llvm/Target/TargetLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetLowering.h?rev=76441&r1=76440&r2=76441&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetLowering.h (original)
+++ llvm/trunk/include/llvm/Target/TargetLowering.h Mon Jul 20 12:51:36 2009
@@ -1270,6 +1270,15 @@
// Inline Asm Support hooks
//
+ /// ExpandInlineAsm - This hook allows the target to expand an inline asm
+ /// call to be explicit llvm code if it wants to. This is useful for
+ /// turning simple inline asms into LLVM intrinsics, which gives the
+ /// compiler more information about the behavior of the code.
+ // FIXME: Move this to TargetLowering.
+ virtual bool ExpandInlineAsm(CallInst *CI) const {
+ return false;
+ }
+
enum ConstraintType {
C_Register, // Constraint represents specific register(s).
C_RegisterClass, // Constraint represents any of register(s) in class.
Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=76441&r1=76440&r2=76441&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Mon Jul 20 12:51:36 2009
@@ -22,6 +22,7 @@
#include "llvm/GlobalAlias.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Function.h"
+#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/LLVMContext.h"
#include "llvm/ADT/BitVector.h"
@@ -8658,6 +8659,100 @@
// X86 Inline Assembly Support
//===----------------------------------------------------------------------===//
+static bool LowerToBSwap(CallInst *CI) {
+ // FIXME: this should verify that we are targetting a 486 or better. If not,
+ // we will turn this bswap into something that will be lowered to logical ops
+ // instead of emitting the bswap asm. For now, we don't support 486 or lower
+ // so don't worry about this.
+
+ // Verify this is a simple bswap.
+ if (CI->getNumOperands() != 2 ||
+ CI->getType() != CI->getOperand(1)->getType() ||
+ !CI->getType()->isInteger())
+ return false;
+
+ const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
+ if (!Ty || Ty->getBitWidth() % 16 != 0)
+ return false;
+
+ // Okay, we can do this xform, do so now.
+ const Type *Tys[] = { Ty };
+ Module *M = CI->getParent()->getParent()->getParent();
+ Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Tys, 1);
+
+ Value *Op = CI->getOperand(1);
+ Op = CallInst::Create(Int, Op, CI->getName(), CI);
+
+ CI->replaceAllUsesWith(Op);
+ CI->eraseFromParent();
+ return true;
+}
+
+bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
+ InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
+ std::vector<InlineAsm::ConstraintInfo> Constraints = IA->ParseConstraints();
+
+ std::string AsmStr = IA->getAsmString();
+
+ // TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
+ std::vector<std::string> AsmPieces;
+ SplitString(AsmStr, AsmPieces, "\n"); // ; as separator?
+
+ switch (AsmPieces.size()) {
+ default: return false;
+ case 1:
+ AsmStr = AsmPieces[0];
+ AsmPieces.clear();
+ SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
+
+ // bswap $0
+ if (AsmPieces.size() == 2 &&
+ (AsmPieces[0] == "bswap" ||
+ AsmPieces[0] == "bswapq" ||
+ AsmPieces[0] == "bswapl") &&
+ (AsmPieces[1] == "$0" ||
+ AsmPieces[1] == "${0:q}")) {
+ // No need to check constraints, nothing other than the equivalent of
+ // "=r,0" would be valid here.
+ return LowerToBSwap(CI);
+ }
+ // rorw $$8, ${0:w} --> llvm.bswap.i16
+ if (CI->getType() == Type::Int16Ty &&
+ AsmPieces.size() == 3 &&
+ AsmPieces[0] == "rorw" &&
+ AsmPieces[1] == "$$8," &&
+ AsmPieces[2] == "${0:w}" &&
+ IA->getConstraintString() == "=r,0,~{dirflag},~{fpsr},~{flags},~{cc}") {
+ return LowerToBSwap(CI);
+ }
+ break;
+ case 3:
+ if (CI->getType() == Type::Int64Ty && Constraints.size() >= 2 &&
+ Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
+ Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
+ // bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
+ std::vector<std::string> Words;
+ SplitString(AsmPieces[0], Words, " \t");
+ if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
+ Words.clear();
+ SplitString(AsmPieces[1], Words, " \t");
+ if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%edx") {
+ Words.clear();
+ SplitString(AsmPieces[2], Words, " \t,");
+ if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
+ Words[2] == "%edx") {
+ return LowerToBSwap(CI);
+ }
+ }
+ }
+ }
+ break;
+ }
+ return false;
+}
+
+
+
/// getConstraintType - Given a constraint letter, return the type of
/// constraint it is for this target.
X86TargetLowering::ConstraintType
Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.h?rev=76441&r1=76440&r2=76441&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.h (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.h Mon Jul 20 12:51:36 2009
@@ -420,6 +420,8 @@
SDValue getReturnAddressFrameIndex(SelectionDAG &DAG);
+ virtual bool ExpandInlineAsm(CallInst *CI) const;
+
ConstraintType getConstraintType(const std::string &Constraint) const;
std::vector<unsigned>
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