[X86][AMX] Report error when shapes are not pre-defined.

Instead of report fatal error, this patch emit error message and exit
when shapes are not pre-defined. This would cause the compiling fail but
not crash.

Differential Revision: https://reviews.llvm.org/D124342

llvm/lib/Target/X86/X86PreTileConfig.cpp

@@ -31,6 +31,7 @@
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineLoopInfo.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/TargetInstrInfo.h"
@@ -40,10 +41,15 @@
 using namespace llvm;
 
 #define DEBUG_TYPE "tile-pre-config"
-#define REPORT_CONFIG_FAIL                                                     \
-  report_fatal_error(                                                          \
-      MF.getName() +                                                           \
-      ": Failed to config tile register, please define the shape earlier");
+
+static void emitErrorMsg(MachineFunction &MF) {
+  SmallString<32> Str;
+  Twine ErrorMsg =
+      MF.getName() +
+      ": Failed to config tile register, please define the shape earlier";
+  LLVMContext &Context = MF.getMMI().getModule()->getContext();
+  Context.emitError(ErrorMsg);
+}
 
 namespace {
 
@@ -302,12 +308,19 @@ bool X86PreTileConfig::runOnMachineFunction(MachineFunction &MF) {
   SmallVector<MachineBasicBlock *, 8> WorkList;
   for (auto &I : ShapeBBs) {
     // TODO: We can hoist shapes across BBs here.
-    if (BBVisitedInfo[I.first].HasAMXRegLiveIn)
-      REPORT_CONFIG_FAIL
+    if (BBVisitedInfo[I.first].HasAMXRegLiveIn) {
+      // We are not able to config tile registers since the shape to config
+      // is not defined yet. Emit error message and continue. The function
+      // would not config tile registers.
+      emitErrorMsg(MF);
+      return false;
+    }
     if (BBVisitedInfo[I.first].FirstAMX &&
         BBVisitedInfo[I.first].FirstAMX < I.second.back() &&
-        !hoistShapesInBB(I.first, I.second))
-      REPORT_CONFIG_FAIL
+        !hoistShapesInBB(I.first, I.second)) {
+      emitErrorMsg(MF);
+      return false;
+    }
     WorkList.push_back(I.first);
   }
   while (!WorkList.empty()) {

llvm/lib/Target/X86/X86TileConfig.cpp

@@ -98,6 +98,9 @@ bool X86TileConfig::runOnMachineFunction(MachineFunction &MF) {
     if (SS != INT_MAX)
       break;
   }
+  // Didn't find LDTILECFG, just return false;
+  if (SS == INT_MAX)
+    return false;
 
   // Try to find a point to insert MIs for constant shapes.
   // Here we are leveraging the palette id inserted in PreRA pass.

llvm/test/CodeGen/X86/AMX/amx-error.ll

@@ -0,0 +1,16 @@
+; RUN: not llc < %s -mtriple=x86_64-unknown-unknown -mattr=+amx-tile -o /dev/null 2>&1 | FileCheck %s
+
+@row = dso_local global i16 8, align 2
+@col = dso_local global i16 8, align 2
+
+define dso_local void @add() {
+entry:
+  ; CHECK: Failed to config tile register
+  %t0 = load i16, ptr @row, align 2
+  %t1 = call x86_amx @llvm.x86.tilezero.internal(i16 %t0, i16 64)
+  %t2 = load i16, ptr @col, align 2
+  %t3 = call x86_amx @llvm.x86.tilezero.internal(i16 16, i16 %t2)
+  ret void
+}
+
+declare x86_amx @llvm.x86.tilezero.internal(i16, i16)