[llvm] 3b1de7a - [X86][AMX] Reduce the compiling time for non-amx code.

[via llvm-commits]

Author: Luo, Yuanke
Date: 2022-05-24T18:02:51+08:00
New Revision: 3b1de7ab6097adc92d5057bc9172c48806704e8c

URL: https://github.com/llvm/llvm-project/commit/3b1de7ab6097adc92d5057bc9172c48806704e8c
DIFF: https://github.com/llvm/llvm-project/commit/3b1de7ab6097adc92d5057bc9172c48806704e8c.diff

LOG: [X86][AMX] Reduce the compiling time for non-amx code.

Differential Revision: https://reviews.llvm.org/D126280

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86FastPreTileConfig.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86FastPreTileConfig.cpp b/llvm/lib/Target/X86/X86FastPreTileConfig.cpp
index 08ccfeda5a4ab..da10964d51ecb 100644
--- a/llvm/lib/Target/X86/X86FastPreTileConfig.cpp
+++ b/llvm/lib/Target/X86/X86FastPreTileConfig.cpp
@@ -663,6 +663,18 @@ bool X86FastPreTileConfig::runOnMachineFunction(MachineFunction &MFunc) {
   CfgSS = -1;
 
   unsigned NumVirtRegs = MRI->getNumVirtRegs();
+  // Abandon early if there is no tile register to config.
+  bool HasVirtTileReg = false;
+  for (unsigned I = 0, E = NumVirtRegs; I != E; ++I) {
+    Register VirtReg = Register::index2VirtReg(I);
+    if (MRI->getRegClass(VirtReg)->getID() == X86::TILERegClassID) {
+      HasVirtTileReg = true;
+      break;
+    }
+  }
+  if (!HasVirtTileReg)
+    return false;
+
   StackSlotForVirtReg.resize(NumVirtRegs);
   MayLiveAcrossBlocks.clear();
   // We will create register during config. *3 is to make sure