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For PR950:

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This patch converts the old SHR instruction into two instructions,
AShr (Arithmetic) and LShr (Logical). The Shr instructions now are not
dependent on the sign of their operands.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31542 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2006-11-08 06:47:33 +00:00
parent 73fb07566b
commit 3822ff5c71
30 changed files with 4514 additions and 3342 deletions
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12
include/llvm/Instructions.h
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@ -604,7 +604,8 @@ class ShiftInst : public Instruction {
Ops[1].init(SI.Ops[1], this);
}
void init(OtherOps Opcode, Value *S, Value *SA) {
assert((Opcode == Shl || Opcode == Shr) && "ShiftInst Opcode invalid!");
assert((Opcode == Shl || Opcode == LShr || Opcode == AShr) &&
"ShiftInst Opcode invalid!");
Ops[0].init(S, this);
Ops[1].init(SA, this);
}
@ -638,7 +639,11 @@ public:
/// isLogicalShift - Return true if this is a logical shift left or a logical
/// shift right.
bool isLogicalShift() const;
bool isLogicalShift() const {
unsigned opcode = getOpcode();
return opcode == Instruction::Shl || opcode == Instruction::LShr;
}
/// isArithmeticShift - Return true if this is a sign-extending shift right
/// operation.
@ -652,7 +657,8 @@ public:
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ShiftInst *) { return true; }
static inline bool classof(const Instruction *I) {
return (I->getOpcode() == Instruction::Shr) |
return (I->getOpcode() == Instruction::LShr) |
(I->getOpcode() == Instruction::AShr) |
(I->getOpcode() == Instruction::Shl);
}
static inline bool classof(const Value *V) {