[clang] [llvm] [RISCV][MC] Add support for Q extension (PR #139369)

[Pengcheng Wang via llvm-commits]

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@@ -0,0 +1,153 @@
+//===-- RISCVInstrInfoQ.td - RISC-V 'Q' instructions -------*- tablegen -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes the RISC-V instructions from the standard 'Q',
+// Quad-Precision Floating-Point instruction set extension.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Operand and SDNode transformation definitions.
+//===----------------------------------------------------------------------===//
+
+def QExt : ExtInfo<"", "", [HasStdExtQ], f128, FPR128, FPR32, FPR64, ?, FPR128>;
+
+defvar QExts = [QExt];
+defvar QExtsRV64 = [QExt];
+
+//===----------------------------------------------------------------------===//
+// Instructions
+//===----------------------------------------------------------------------===//
+
+let Predicates = [HasStdExtQ] in {
+  // def FLQ : FPLoad_r<0b100, "flq", FPR128, WriteFLD128>;
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wangpc-pp wrote:

Don't comment out these defs, please remove them.

https://github.com/llvm/llvm-project/pull/139369