[llvm] [MacroFusion] Support commutable instructions (PR #82751)

Wang Pengcheng via llvm-commits llvm-commits at lists.llvm.org
Tue Mar 5 03:56:19 PST 2024


https://github.com/wangpc-pp updated https://github.com/llvm/llvm-project/pull/82751

>From ac501156aad70f44b1155c0ea4094c5bc0d5142d Mon Sep 17 00:00:00 2001
From: Wang Pengcheng <wangpengcheng.pp at bytedance.com>
Date: Fri, 23 Feb 2024 18:54:07 +0800
Subject: [PATCH] [MacroFusion] Support commutable instructions

If the second instruction is commutable, we should be able to check
its commutable operands.

A simple RISCV fusion is contained in this PR to show the functionality
is correct, I may remove it when landing.

Fixes #82738
---
 llvm/include/llvm/Target/TargetSchedule.td    | 17 ++++++---
 llvm/lib/Target/RISCV/RISCVMacroFusion.td     | 21 +++++++++++
 llvm/test/CodeGen/RISCV/macro-fusions.mir     | 30 ++++++++++++++-
 llvm/test/TableGen/MacroFusion.td             | 26 ++++++++-----
 .../TableGen/MacroFusionPredicatorEmitter.cpp | 37 ++++++++++++++++++-
 5 files changed, 114 insertions(+), 17 deletions(-)

diff --git a/llvm/include/llvm/Target/TargetSchedule.td b/llvm/include/llvm/Target/TargetSchedule.td
index 069eb2900bfe68..a872cc30a9b50c 100644
--- a/llvm/include/llvm/Target/TargetSchedule.td
+++ b/llvm/include/llvm/Target/TargetSchedule.td
@@ -622,11 +622,22 @@ class BothFusionPredicateWithMCInstPredicate<MCInstPredicate pred>
 // Tie firstOpIdx and secondOpIdx. The operand of `FirstMI` at position
 // `firstOpIdx` should be the same as the operand of `SecondMI` at position
 // `secondOpIdx`.
+// If the operand at `secondOpIdx` has commutable operand, then the commutable
+// operand will be checked too.
 class TieReg<int firstOpIdx, int secondOpIdx> : BothFusionPredicate {
   int FirstOpIdx = firstOpIdx;
   int SecondOpIdx = secondOpIdx;
 }
 
+// The operand of `SecondMI` at position `firstOpIdx` should be the same as the
+// operand at position `secondOpIdx`.
+// If the operand at `secondOpIdx` has commutable operand, then the commutable
+// operand will be checked too.
+class SameReg<int firstOpIdx, int secondOpIdx> : SecondFusionPredicate {
+  int FirstOpIdx = firstOpIdx;
+  int SecondOpIdx = secondOpIdx;
+}
+
 // A predicate for wildcard. The generated code will be like:
 // ```
 // if (!FirstMI)
@@ -688,11 +699,7 @@ class SimpleFusion<string name, string fieldName, string desc,
                 SecondFusionPredicateWithMCInstPredicate<secondPred>,
                 WildcardTrue,
                 FirstFusionPredicateWithMCInstPredicate<firstPred>,
-                SecondFusionPredicateWithMCInstPredicate<
-                  CheckAny<[
-                    CheckIsVRegOperand<0>,
-                    CheckSameRegOperand<0, 1>
-                  ]>>,
+                SameReg<0, 1>,
                 OneUse,
                 TieReg<0, 1>,
               ],
diff --git a/llvm/lib/Target/RISCV/RISCVMacroFusion.td b/llvm/lib/Target/RISCV/RISCVMacroFusion.td
index 875a93d09a2c64..14e8962f8ce110 100644
--- a/llvm/lib/Target/RISCV/RISCVMacroFusion.td
+++ b/llvm/lib/Target/RISCV/RISCVMacroFusion.td
@@ -91,3 +91,24 @@ def TuneLDADDFusion
                    CheckIsImmOperand<2>,
                    CheckImmOperand<2, 0>
                  ]>>;
+
+// These should be covered by Zba extension.
+// * shift left by one and add:
+//   slli r1, r0, 1
+//   add r1, r1, r2
+// * shift left by two and add:
+//   slli r1, r0, 2
+//   add r1, r1, r2
+// * shift left by three and add:
+//   slli r1, r0, 3
+//   add r1, r1, r2
+def ShiftNAddFusion
+  : SimpleFusion<"shift-n-add-fusion", "HasShiftNAddFusion",
+                 "Enable SLLI+ADD to be fused to shift left by 1/2/3 and add",
+                 CheckAll<[
+                   CheckOpcode<[SLLI]>,
+                   CheckAny<[CheckImmOperand<2, 1>,
+                             CheckImmOperand<2, 2>,
+                             CheckImmOperand<2, 3>]>
+                 ]>,
+                 CheckOpcode<[ADD]>>;
diff --git a/llvm/test/CodeGen/RISCV/macro-fusions.mir b/llvm/test/CodeGen/RISCV/macro-fusions.mir
index 13464141ce27e6..11bb456e0ca050 100644
--- a/llvm/test/CodeGen/RISCV/macro-fusions.mir
+++ b/llvm/test/CodeGen/RISCV/macro-fusions.mir
@@ -1,7 +1,7 @@
 # REQUIRES: asserts
 # RUN: llc -mtriple=riscv64-linux-gnu -x=mir < %s \
 # RUN:   -debug-only=machine-scheduler -start-before=machine-scheduler 2>&1 \
-# RUN:   -mattr=+lui-addi-fusion,+auipc-addi-fusion,+zexth-fusion,+zextw-fusion,+shifted-zextw-fusion,+ld-add-fusion \
+# RUN:   -mattr=+lui-addi-fusion,+auipc-addi-fusion,+zexth-fusion,+zextw-fusion,+shifted-zextw-fusion,+ld-add-fusion,+shift-n-add-fusion \
 # RUN:   | FileCheck %s
 
 # CHECK: lui_addi:%bb.0
@@ -174,3 +174,31 @@ body:             |
     $x11 = COPY %5
     PseudoRET
 ...
+
+# CHECK: shift_n_add:%bb.0
+# CHECK: Macro fuse: {{.*}}SLLI - ADD
+---
+name: shift_n_add
+tracksRegLiveness: true
+body:             |
+  bb.0.entry:
+    liveins: $x10, $x11
+    $x10 = SLLI $x10, 1
+    $x12 = XORI $x11, 3
+    $x10 = ADD $x10, $x11
+    PseudoRET
+...
+
+# CHECK: shift_n_add_commutable:%bb.0
+# CHECK: Macro fuse: {{.*}}SLLI - ADD
+---
+name: shift_n_add_commutable
+tracksRegLiveness: true
+body:             |
+  bb.0.entry:
+    liveins: $x10, $x11
+    $x10 = SLLI $x10, 1
+    $x12 = XORI $x11, 3
+    $x10 = ADD $x11, $x10
+    PseudoRET
+...
diff --git a/llvm/test/TableGen/MacroFusion.td b/llvm/test/TableGen/MacroFusion.td
index ce76e7f0f7fa64..c1cdd0fee78ccd 100644
--- a/llvm/test/TableGen/MacroFusion.td
+++ b/llvm/test/TableGen/MacroFusion.td
@@ -99,13 +99,15 @@ def TestFusion: SimpleFusion<"test-fusion", "HasTestFusion", "Test Fusion",
 // CHECK-PREDICATOR-NEXT:      if (( MI->getOpcode() != Test::Inst0 ))
 // CHECK-PREDICATOR-NEXT:        return false;
 // CHECK-PREDICATOR-NEXT:    }
-// CHECK-PREDICATOR-NEXT:    {
-// CHECK-PREDICATOR-NEXT:      const MachineInstr *MI = &SecondMI;
-// CHECK-PREDICATOR-NEXT:      if (!(
-// CHECK-PREDICATOR-NEXT:          MI->getOperand(0).getReg().isVirtual()
-// CHECK-PREDICATOR-NEXT:          || MI->getOperand(0).getReg() == MI->getOperand(1).getReg()
-// CHECK-PREDICATOR-NEXT:        ))
-// CHECK-PREDICATOR-NEXT:        return false;
+// CHECK-PREDICATOR-NEXT:    if (!SecondMI.getOperand(0).getReg().isVirtual()) {                                                                                                                                                                                      
+// CHECK-PREDICATOR-NEXT:      if (SecondMI.getOperand(0).getReg() != SecondMI.getOperand(1).getReg()) {                                                                                                                                                              
+// CHECK-PREDICATOR-NEXT:        if (!SecondMI.getDesc().isCommutable())                                                                                                                                                                                              
+// CHECK-PREDICATOR-NEXT:          return false;
+// CHECK-PREDICATOR-NEXT:        unsigned SrcOpIdx1 = 1, SrcOpIdx2 = TargetInstrInfo::CommuteAnyOperandIndex;
+// CHECK-PREDICATOR-NEXT:        if (TII.findCommutedOpIndices(SecondMI, SrcOpIdx1, SrcOpIdx2))
+// CHECK-PREDICATOR-NEXT:          if (SecondMI.getOperand(0).getReg() != SecondMI.getOperand(SrcOpIdx2).getReg())
+// CHECK-PREDICATOR-NEXT:            return false;
+// CHECK-PREDICATOR-NEXT:      }
 // CHECK-PREDICATOR-NEXT:    }
 // CHECK-PREDICATOR-NEXT:    {
 // CHECK-PREDICATOR-NEXT:      Register FirstDest = FirstMI->getOperand(0).getReg();
@@ -114,8 +116,14 @@ def TestFusion: SimpleFusion<"test-fusion", "HasTestFusion", "Test Fusion",
 // CHECK-PREDICATOR-NEXT:    }
 // CHECK-PREDICATOR-NEXT:    if (!(FirstMI->getOperand(0).isReg() &&
 // CHECK-PREDICATOR-NEXT:          SecondMI.getOperand(1).isReg() &&
-// CHECK-PREDICATOR-NEXT:          FirstMI->getOperand(0).getReg() == SecondMI.getOperand(1).getReg()))
-// CHECK-PREDICATOR-NEXT:      return false;
+// CHECK-PREDICATOR-NEXT:          FirstMI->getOperand(0).getReg() == SecondMI.getOperand(1).getReg())) {
+// CHECK-PREDICATOR-NEXT:      if (!SecondMI.getDesc().isCommutable())
+// CHECK-PREDICATOR-NEXT:        return false;
+// CHECK-PREDICATOR-NEXT:      unsigned SrcOpIdx1 = 1, SrcOpIdx2 = TargetInstrInfo::CommuteAnyOperandIndex;
+// CHECK-PREDICATOR-NEXT:      if (TII.findCommutedOpIndices(SecondMI, SrcOpIdx1, SrcOpIdx2))
+// CHECK-PREDICATOR-NEXT:        if (FirstMI->getOperand(0).getReg() != SecondMI.getOperand(SrcOpIdx2).getReg())
+// CHECK-PREDICATOR-NEXT:          return false;
+// CHECK-PREDICATOR-NEXT:    }
 // CHECK-PREDICATOR-NEXT:    return true;
 // CHECK-PREDICATOR-NEXT:  }
 // CHECK-PREDICATOR-NEXT:  } // end namespace llvm
diff --git a/llvm/utils/TableGen/MacroFusionPredicatorEmitter.cpp b/llvm/utils/TableGen/MacroFusionPredicatorEmitter.cpp
index 7f494e532b1f44..1042dd9c2dbccf 100644
--- a/llvm/utils/TableGen/MacroFusionPredicatorEmitter.cpp
+++ b/llvm/utils/TableGen/MacroFusionPredicatorEmitter.cpp
@@ -182,6 +182,28 @@ void MacroFusionPredicatorEmitter::emitSecondPredicate(Record *Predicate,
     OS << ")\n";
     OS.indent(4) << "  return false;\n";
     OS.indent(2) << "}\n";
+  } else if (Predicate->isSubClassOf("SameReg")) {
+    int FirstOpIdx = Predicate->getValueAsInt("FirstOpIdx");
+    int SecondOpIdx = Predicate->getValueAsInt("SecondOpIdx");
+
+    OS.indent(2) << "if (!SecondMI.getOperand(" << FirstOpIdx
+                 << ").getReg().isVirtual()) {\n";
+    OS.indent(4) << "if (SecondMI.getOperand(" << FirstOpIdx
+                 << ").getReg() != SecondMI.getOperand(" << SecondOpIdx
+                 << ").getReg()) {\n";
+
+    OS.indent(6) << "if (!SecondMI.getDesc().isCommutable())\n";
+    OS.indent(6) << "  return false;\n";
+
+    OS.indent(6) << "unsigned SrcOpIdx1 = " << SecondOpIdx
+                 << ", SrcOpIdx2 = TargetInstrInfo::CommuteAnyOperandIndex;\n";
+    OS.indent(6)
+        << "if (TII.findCommutedOpIndices(SecondMI, SrcOpIdx1, SrcOpIdx2))\n";
+    OS.indent(6) << "  if (SecondMI.getOperand(" << FirstOpIdx
+                 << ").getReg() != SecondMI.getOperand(SrcOpIdx2).getReg())\n";
+    OS.indent(6) << "    return false;\n";
+    OS.indent(4) << "}\n";
+    OS.indent(2) << "}\n";
   } else {
     PrintFatalError(Predicate->getLoc(),
                     "Unsupported predicate for second instruction: " +
@@ -206,8 +228,19 @@ void MacroFusionPredicatorEmitter::emitBothPredicate(Record *Predicate,
                  << ").isReg() &&\n";
     OS.indent(2) << "      FirstMI->getOperand(" << FirstOpIdx
                  << ").getReg() == SecondMI.getOperand(" << SecondOpIdx
-                 << ").getReg()))\n";
-    OS.indent(2) << "  return false;\n";
+                 << ").getReg())) {\n";
+
+    OS.indent(4) << "if (!SecondMI.getDesc().isCommutable())\n";
+    OS.indent(4) << "  return false;\n";
+
+    OS.indent(4) << "unsigned SrcOpIdx1 = " << SecondOpIdx
+                 << ", SrcOpIdx2 = TargetInstrInfo::CommuteAnyOperandIndex;\n";
+    OS.indent(4)
+        << "if (TII.findCommutedOpIndices(SecondMI, SrcOpIdx1, SrcOpIdx2))\n";
+    OS.indent(4) << "  if (FirstMI->getOperand(" << FirstOpIdx
+                 << ").getReg() != SecondMI.getOperand(SrcOpIdx2).getReg())\n";
+    OS.indent(4) << "    return false;\n";
+    OS.indent(2) << "}\n";
   } else
     PrintFatalError(Predicate->getLoc(),
                     "Unsupported predicate for both instruction: " +



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