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Add simplified LogicalShiftRight64 IR opcode

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Tillmann Karras
2016-08-07 14:23:33 +01:00
committed by MerryMage
parent ccb2aa96a5
commit 5d26899ac9
4 changed files with 17 additions and 0 deletions
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11
src/backend_x64/emit_x64.cpp
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@@ -592,6 +592,17 @@ void EmitX64::EmitLogicalShiftRight(IR::Block& block, IR::Inst* inst) {
}
}
void EmitX64::EmitLogicalShiftRight64(IR::Block& block, IR::Inst* inst) {
X64Reg result = reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
auto shift_arg = inst->GetArg(1);
ASSERT_MSG(shift_arg.IsImmediate(), "variable 64 bit shifts are not implemented");
u8 shift = shift_arg.GetU8();
ASSERT_MSG(shift < 64, "shift width clamping is not implemented");
code->SHR(64, R(result), Imm8(shift));
}
void EmitX64::EmitArithmeticShiftRight(IR::Block& block, IR::Inst* inst) {
auto carry_inst = FindUseWithOpcode(inst, IR::Opcode::GetCarryFromOp);