[AArch64][GlobalISel] Fix constraining LDXPX intrinsic selection.

aemerson · aemerson · commit a11d9a1f480f · 2021-07-27T12:13:56.000-07:00
Causes a fallback because of lack of regclasses on vregs, unless its without
asserts, where we end up crashing later in codegen.
diff --git a/llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp b/llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
@@ -5042,6 +5042,7 @@ bool AArch64InstructionSelector::selectIntrinsicWithSideEffects(
         {I.getOperand(0).getReg(), I.getOperand(1).getReg()},
         {I.getOperand(3)});
     NewI.cloneMemRefs(I);
+    constrainSelectedInstRegOperands(*NewI, TII, TRI, RBI);
     break;
   }
   case Intrinsic::trap:

Original file line number	Diff line number	Diff line change
`@@ -5042,6 +5042,7 @@ bool AArch64InstructionSelector::selectIntrinsicWithSideEffects(`
`5042`	`5042`	`{I.getOperand(0).getReg(), I.getOperand(1).getReg()},`
`5043`	`5043`	`{I.getOperand(3)});`
`5044`	`5044`	`NewI.cloneMemRefs(I);`
	`5045`	`+ constrainSelectedInstRegOperands(*NewI, TII, TRI, RBI);`
`5045`	`5046`	`break;`
`5046`	`5047`	`}`
`5047`	`5048`	`case Intrinsic::trap:`