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Add IR opcode RotateRightExtended

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to rotate through the carry flag
This commit is contained in:
Tillmann Karras 2016-07-31 19:07:35 +01:00
parent dacaeadb6a
commit 2488926341
4 changed files with 26 additions and 0 deletions
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18
src/backend_x64/emit_x64.cpp
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@ -636,6 +636,24 @@ void EmitX64::EmitRotateRight(IR::Block& block, IR::Inst* inst) {
}
}
void EmitX64::EmitRotateRightExtended(IR::Block& block, IR::Inst* inst) {
auto carry_inst = FindUseWithOpcode(inst, IR::Opcode::GetCarryFromOp);
X64Reg result = reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
X64Reg carry = carry_inst
? reg_alloc.UseDefRegister(inst->GetArg(1), carry_inst, any_gpr)
: reg_alloc.UseRegister(inst->GetArg(1), any_gpr);
code->BT(32, R(carry), Imm8(0));
code->RCR(32, R(result), Imm8(1));
if (carry_inst) {
EraseInstruction(block, carry_inst);
reg_alloc.DecrementRemainingUses(inst);
code->SETcc(CC_C, R(carry));
}
}
static X64Reg DoCarry(RegAlloc& reg_alloc, const IR::Value& carry_in, IR::Inst* carry_out) {
if (carry_in.IsImmediate()) {
return carry_out ? reg_alloc.DefRegister(carry_out, any_gpr) : INVALID_REG;