[clang] [llvm] [RISCV] Add Qualcomm uC Xqcicsr (CSR) extension (PR #117169)
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Thu Nov 21 06:48:59 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
Author: Sudharsan Veeravalli (svs-quic)
<details>
<summary>Changes</summary>
The Qualcomm uC Xqcicsr extension adds 2 instructions that can read and write CSRs.
The current spec can be found at:
https://github.com/quic/riscv-unified-db/releases/latest
This patch adds assembler only support.
---
Full diff: https://github.com/llvm/llvm-project/pull/117169.diff
12 Files Affected:
- (modified) clang/test/Driver/print-supported-extensions-riscv.c (+1)
- (modified) llvm/docs/RISCVUsage.rst (+3)
- (modified) llvm/docs/ReleaseNotes.md (+2-1)
- (modified) llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp (+2)
- (modified) llvm/lib/Target/RISCV/RISCVFeatures.td (+10)
- (modified) llvm/lib/Target/RISCV/RISCVInstrInfo.td (+1)
- (added) llvm/lib/Target/RISCV/RISCVInstrInfoXqci.td (+44)
- (modified) llvm/lib/TargetParser/RISCVISAInfo.cpp (+4)
- (modified) llvm/test/CodeGen/RISCV/attributes.ll (+2)
- (added) llvm/test/MC/RISCV/xqcicsr-invalid.s (+27)
- (added) llvm/test/MC/RISCV/xqcicsr-valid.s (+19)
- (modified) llvm/unittests/TargetParser/RISCVISAInfoTest.cpp (+1)
``````````diff
diff --git a/clang/test/Driver/print-supported-extensions-riscv.c b/clang/test/Driver/print-supported-extensions-riscv.c
index 774dc3a4e1e756..a0b93621d2fcdc 100644
--- a/clang/test/Driver/print-supported-extensions-riscv.c
+++ b/clang/test/Driver/print-supported-extensions-riscv.c
@@ -187,6 +187,7 @@
// CHECK-NEXT: zvkgs 0.7 'Zvkgs' (Vector-Scalar GCM instructions for Cryptography)
// CHECK-NEXT: smctr 1.0 'Smctr' (Control Transfer Records Machine Level)
// CHECK-NEXT: ssctr 1.0 'Ssctr' (Control Transfer Records Supervisor Level)
+// CHECK-NEXT: xqcicsr 0.2 'Xqcicsr' (Qualcomm uC CSR Extension)
// CHECK-EMPTY:
// CHECK-NEXT: Supported Profiles
// CHECK-NEXT: rva20s64
diff --git a/llvm/docs/RISCVUsage.rst b/llvm/docs/RISCVUsage.rst
index 1317221448ea5b..a656ccd00ed482 100644
--- a/llvm/docs/RISCVUsage.rst
+++ b/llvm/docs/RISCVUsage.rst
@@ -329,6 +329,9 @@ The primary goal of experimental support is to assist in the process of ratifica
``experimental-smctr``, ``experimental-ssctr``
LLVM implements the `1.0-rc3 specification <https://github.com/riscv/riscv-control-transfer-records/releases/tag/v1.0_rc3>`__.
+``experimental-xqcicsr``
+ LLVM implements the `0.2 extension specification <https://github.com/quic/riscv-unified-db/releases/latest>`__.
+
To use an experimental extension from `clang`, you must add `-menable-experimental-extensions` to the command line, and specify the exact version of the experimental extension you are using. To use an experimental extension with LLVM's internal developer tools (e.g. `llc`, `llvm-objdump`, `llvm-mc`), you must prefix the extension name with `experimental-`. Note that you don't need to specify the version with internal tools, and shouldn't include the `experimental-` prefix with `clang`.
Vendor Extensions
diff --git a/llvm/docs/ReleaseNotes.md b/llvm/docs/ReleaseNotes.md
index 1ba3672baeed88..89e7c048592f34 100644
--- a/llvm/docs/ReleaseNotes.md
+++ b/llvm/docs/ReleaseNotes.md
@@ -211,7 +211,8 @@ Changes to the RISC-V Backend
* `f` and `cf` inline assembly constraints, when using F-/D-/H-in-X extensions,
will use the relevant GPR rather than FPR. This makes inline assembly portable
between e.g. F and Zfinx code.
-
+* Adds experimental assembler support for the Qualcomm uC 'Xqcicsr` (CSR)
+ extension.
Changes to the WebAssembly Backend
----------------------------------
diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index cf8e337810d83b..e4f7ee323cf20b 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -682,6 +682,8 @@ DecodeStatus RISCVDisassembler::getInstruction32(MCInst &MI, uint64_t &Size,
"CORE-V SIMD extensions custom opcode table");
TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXCVbi, DecoderTableXCVbi32,
"CORE-V Immediate Branching custom opcode table");
+ TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXqcicsr, DecoderTableXqcicsr32,
+ "Qualcomm uC CSR custom opcode table");
TRY_TO_DECODE(true, DecoderTable32, "RISCV32 table");
return MCDisassembler::Fail;
diff --git a/llvm/lib/Target/RISCV/RISCVFeatures.td b/llvm/lib/Target/RISCV/RISCVFeatures.td
index 3977816ebdd49c..ed87c9604f38b1 100644
--- a/llvm/lib/Target/RISCV/RISCVFeatures.td
+++ b/llvm/lib/Target/RISCV/RISCVFeatures.td
@@ -1338,6 +1338,16 @@ def HasVendorXwchc
AssemblerPredicate<(all_of FeatureVendorXwchc),
"'Xwchc' (WCH/QingKe additional compressed opcodes)">;
+// Qualcomm Extension(s)
+
+def FeatureVendorXqcicsr
+ : RISCVExperimentalExtension<"xqcicsr", 0, 2,
+ "'Xqcicsr' (Qualcomm uC CSR Extension)">;
+def HasVendorXqcicsr
+ : Predicate<"Subtarget->hasVendorXqcicsr()">,
+ AssemblerPredicate<(all_of FeatureVendorXqcicsr),
+ "'Xqcicsr' (Qualcomm uC CSR Extension)">;
+
//===----------------------------------------------------------------------===//
// LLVM specific features and extensions
//===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.td b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
index 5747f05ffafd47..cad9f5e3790be1 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
@@ -2064,6 +2064,7 @@ include "RISCVInstrInfoXSf.td"
include "RISCVInstrInfoSFB.td"
include "RISCVInstrInfoXCV.td"
include "RISCVInstrInfoXwch.td"
+include "RISCVInstrInfoXqci.td"
//===----------------------------------------------------------------------===//
// Global ISel
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoXqci.td b/llvm/lib/Target/RISCV/RISCVInstrInfoXqci.td
new file mode 100644
index 00000000000000..562cd3182c0b42
--- /dev/null
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoXqci.td
@@ -0,0 +1,44 @@
+//===---------------- RISCVInstrInfoXQci.td ----------------*- 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 vendor extensions defined by QUALCOMM.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Operand and SDNode transformation definitions.
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Instruction Formats
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Instruction Class Templates
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Instructions
+//===----------------------------------------------------------------------===//
+
+let Predicates = [HasVendorXqcicsr, IsRV32], DecoderNamespace = "Xqcicsr" in {
+let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in {
+ def QC_CSRRWR : RVInstR<0b1000110, 0b000, OPC_SYSTEM, (outs GPR:$rd),
+ (ins GPR:$rs1, GPRNoX0:$rs2), "qc.csrrwr",
+ "$rd, $rs1, $rs2">;
+
+ def QC_CSRRWRI : RVInstRBase<0b000, OPC_SYSTEM, (outs GPR:$rd),
+ (ins uimm5:$imm5, GPRNoX0:$rs2),
+ "qc.csrrwri", "$rd, $imm5, $rs2"> {
+ bits<5> imm5;
+
+ let Inst{31-25} = {0b1000111};
+ let Inst{19-15} = imm5;
+ }
+} // hasSideEffects = 0, mayLoad = 0, mayStore = 0
+} // Predicates = [HasVendorXqcicsr, IsRV32], DecoderNamespace = "Xqcicsr"
diff --git a/llvm/lib/TargetParser/RISCVISAInfo.cpp b/llvm/lib/TargetParser/RISCVISAInfo.cpp
index c1bc441fc3f63d..63f75cc605f67d 100644
--- a/llvm/lib/TargetParser/RISCVISAInfo.cpp
+++ b/llvm/lib/TargetParser/RISCVISAInfo.cpp
@@ -771,6 +771,10 @@ Error RISCVISAInfo::checkDependency() {
return getIncompatibleError("xwchc", "zcb");
}
+ if (Exts.count("xqcicsr") != 0 && (XLen != 32)) {
+ return getError("'xqcicsr' is only supported in 'rv32'");
+ }
+
return Error::success();
}
diff --git a/llvm/test/CodeGen/RISCV/attributes.ll b/llvm/test/CodeGen/RISCV/attributes.ll
index 1c8c459d1b316e..e4c3a6051f3884 100644
--- a/llvm/test/CodeGen/RISCV/attributes.ll
+++ b/llvm/test/CodeGen/RISCV/attributes.ll
@@ -80,6 +80,7 @@
; RUN: llc -mtriple=riscv32 -mattr=+xtheadmempair %s -o - | FileCheck --check-prefix=RV32XTHEADMEMPAIR %s
; RUN: llc -mtriple=riscv32 -mattr=+xtheadsync %s -o - | FileCheck --check-prefix=RV32XTHEADSYNC %s
; RUN: llc -mtriple=riscv32 -mattr=+xwchc %s -o - | FileCheck --check-prefix=RV32XWCHC %s
+; RUN: llc -mtriple=riscv32 -mattr=+experimental-xqcicsr %s -o - | FileCheck --check-prefix=RV32XQCICSR %s
; RUN: llc -mtriple=riscv32 -mattr=+zaamo %s -o - | FileCheck --check-prefix=RV32ZAAMO %s
; RUN: llc -mtriple=riscv32 -mattr=+zalrsc %s -o - | FileCheck --check-prefix=RV32ZALRSC %s
; RUN: llc -mtriple=riscv32 -mattr=+zca %s -o - | FileCheck --check-prefixes=CHECK,RV32ZCA %s
@@ -382,6 +383,7 @@
; RV32XTHEADMEMPAIR: .attribute 5, "rv32i2p1_xtheadmempair1p0"
; RV32XTHEADSYNC: .attribute 5, "rv32i2p1_xtheadsync1p0"
; RV32XWCHC: .attribute 5, "rv32i2p1_xwchc2p2"
+; RV32XQCICSR: .attribute 5, "rv32i2p1_xqcicsr0p2"
; RV32ZAAMO: .attribute 5, "rv32i2p1_zaamo1p0"
; RV32ZALRSC: .attribute 5, "rv32i2p1_zalrsc1p0"
; RV32ZCA: .attribute 5, "rv32i2p1_zca1p0"
diff --git a/llvm/test/MC/RISCV/xqcicsr-invalid.s b/llvm/test/MC/RISCV/xqcicsr-invalid.s
new file mode 100644
index 00000000000000..26fa26f7ff95f1
--- /dev/null
+++ b/llvm/test/MC/RISCV/xqcicsr-invalid.s
@@ -0,0 +1,27 @@
+# Xqcicsr - Qualcomm uC CSR Extension
+# RUN: not llvm-mc -triple riscv32 -mattr=+experimental-xqcicsr < %s 2>&1 \
+# RUN: | FileCheck -check-prefixes=CHECK,CHECK-PLUS %s
+# RUN: not llvm-mc -triple riscv32 -mattr=-experimental-xqcicsr < %s 2>&1 \
+# RUN: | FileCheck -check-prefixes=CHECK,CHECK-MINUS %s
+
+# CHECK: :[[@LINE+1]]:20: error: invalid operand for instruction
+qc.csrrwr x10, x5, x0
+
+# CHECK: :[[@LINE+1]]:1: error: too few operands for instruction
+qc.csrrwr x10, x5
+
+# CHECK-MINUS: :[[@LINE+1]]:1: error: instruction requires the following: 'Xqcicsr' (Qualcomm uC CSR Extension)
+qc.csrrwr x10, x5, x20
+
+
+# CHECK: :[[@LINE+1]]:21: error: invalid operand for instruction
+qc.csrrwri x20, 31, x0
+
+# CHECK-PLUS: :[[@LINE+1]]:17: error: immediate must be an integer in the range [0, 31]
+qc.csrrwri x20, 45, x12
+
+# CHECK: :[[@LINE+1]]:1: error: too few operands for instruction
+qc.csrrwri x20, 23
+
+# CHECK-MINUS: :[[@LINE+1]]:1: error: instruction requires the following: 'Xqcicsr' (Qualcomm uC CSR Extension)
+qc.csrrwri x30, 31, x12
diff --git a/llvm/test/MC/RISCV/xqcicsr-valid.s b/llvm/test/MC/RISCV/xqcicsr-valid.s
new file mode 100644
index 00000000000000..f5cbf46e8bbded
--- /dev/null
+++ b/llvm/test/MC/RISCV/xqcicsr-valid.s
@@ -0,0 +1,19 @@
+# Xqcicsr - Qualcomm uC CSR Extension
+# RUN: llvm-mc %s -triple=riscv32 -mattr=+experimental-xqcicsr -riscv-no-aliases -show-encoding \
+# RUN: | FileCheck -check-prefixes=CHECK-ENC,CHECK-INST %s
+# RUN: llvm-mc -filetype=obj -triple riscv32 -mattr=+experimental-xqcicsr < %s \
+# RUN: | llvm-objdump --mattr=+experimental-xqcicsr -M no-aliases --no-print-imm-hex -d - \
+# RUN: | FileCheck -check-prefix=CHECK-INST %s
+# RUN: llvm-mc %s -triple=riscv32 -mattr=+experimental-xqcicsr -show-encoding \
+# RUN: | FileCheck -check-prefixes=CHECK-ENC,CHECK-INST %s
+# RUN: llvm-mc -filetype=obj -triple riscv32 -mattr=+experimental-xqcicsr < %s \
+# RUN: | llvm-objdump --mattr=+experimental-xqcicsr --no-print-imm-hex -d - \
+# RUN: | FileCheck -check-prefix=CHECK-INST %s
+
+# CHECK-INST: qc.csrrwr a0, t0, s4
+# CHECK-ENC: encoding: [0x73,0x85,0x42,0x8d]
+qc.csrrwr x10, x5, x20
+
+# CHECK-INST: qc.csrrwri s4, 31, a2
+# CHECK-ENC: encoding: [0x73,0x8a,0xcf,0x8e]
+qc.csrrwri x20, 31, x12
\ No newline at end of file
diff --git a/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp b/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
index 08944659d78f46..a59976d2b303d7 100644
--- a/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
+++ b/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
@@ -1084,6 +1084,7 @@ Experimental extensions
zvkgs 0.7
smctr 1.0
ssctr 1.0
+ xqcicsr 0.2
Supported Profiles
rva20s64
``````````
</details>
https://github.com/llvm/llvm-project/pull/117169
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