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-rw-r--r--lib/Target/X86/X86ISelLowering.cpp94
1 files changed, 42 insertions, 52 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index f871b5a..99ada98 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -28,6 +28,7 @@
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/LLVMContext.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
@@ -11729,38 +11730,8 @@ bool X86TargetLowering::IsDesirableToPromoteOp(SDValue Op, EVT &PVT) const {
// 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->getNumArgOperands() != 1 ||
- CI->getType() != CI->getArgOperand(0)->getType() ||
- !CI->getType()->isIntegerTy())
- 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->getArgOperand(0);
- 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());
- InlineAsm::ConstraintInfoVector Constraints = IA->ParseConstraints();
std::string AsmStr = IA->getAsmString();
@@ -11775,6 +11746,10 @@ bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
AsmPieces.clear();
SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
+ // 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.
// bswap $0
if (AsmPieces.size() == 2 &&
(AsmPieces[0] == "bswap" ||
@@ -11784,7 +11759,10 @@ bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
AsmPieces[1] == "${0:q}")) {
// No need to check constraints, nothing other than the equivalent of
// "=r,0" would be valid here.
- return LowerToBSwap(CI);
+ const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
+ if (!Ty || Ty->getBitWidth() % 16 != 0)
+ return false;
+ return IntrinsicLowering::LowerToByteSwap(CI);
}
// rorw $$8, ${0:w} --> llvm.bswap.i16
if (CI->getType()->isIntegerTy(16) &&
@@ -11794,15 +11772,18 @@ bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
AsmPieces[2] == "${0:w}" &&
IA->getConstraintString().compare(0, 5, "=r,0,") == 0) {
AsmPieces.clear();
- const std::string &Constraints = IA->getConstraintString();
- SplitString(StringRef(Constraints).substr(5), AsmPieces, ",");
+ const std::string &ConstraintsStr = IA->getConstraintString();
+ SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
std::sort(AsmPieces.begin(), AsmPieces.end());
if (AsmPieces.size() == 4 &&
AsmPieces[0] == "~{cc}" &&
AsmPieces[1] == "~{dirflag}" &&
AsmPieces[2] == "~{flags}" &&
AsmPieces[3] == "~{fpsr}") {
- return LowerToBSwap(CI);
+ const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
+ if (!Ty || Ty->getBitWidth() % 16 != 0)
+ return false;
+ return IntrinsicLowering::LowerToByteSwap(CI);
}
}
break;
@@ -11822,36 +11803,45 @@ bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
if (Words.size() == 3 && Words[0] == "rorw" && Words[1] == "$$8" &&
Words[2] == "${0:w}") {
AsmPieces.clear();
- const std::string &Constraints = IA->getConstraintString();
- SplitString(StringRef(Constraints).substr(5), AsmPieces, ",");
+ const std::string &ConstraintsStr = IA->getConstraintString();
+ SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
std::sort(AsmPieces.begin(), AsmPieces.end());
if (AsmPieces.size() == 4 &&
AsmPieces[0] == "~{cc}" &&
AsmPieces[1] == "~{dirflag}" &&
AsmPieces[2] == "~{flags}" &&
AsmPieces[3] == "~{fpsr}") {
- return LowerToBSwap(CI);
+ const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
+ if (!Ty || Ty->getBitWidth() % 16 != 0)
+ return false;
+ return IntrinsicLowering::LowerToByteSwap(CI);
}
}
}
}
}
- if (CI->getType()->isIntegerTy(64) &&
- 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
- SmallVector<StringRef, 4> 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") {
+
+ if (CI->getType()->isIntegerTy(64)) {
+ InlineAsm::ConstraintInfoVector Constraints = IA->ParseConstraints();
+ if (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
+ SmallVector<StringRef, 4> Words;
+ SplitString(AsmPieces[0], Words, " \t");
+ if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
Words.clear();
- SplitString(AsmPieces[2], Words, " \t,");
- if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
- Words[2] == "%edx") {
- return LowerToBSwap(CI);
+ 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") {
+ const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
+ if (!Ty || Ty->getBitWidth() % 16 != 0)
+ return false;
+ return IntrinsicLowering::LowerToByteSwap(CI);
+ }
}
}
}
generated by cgit v1.1 at 2025-05-18 03:21:54 +0000