[llvm] Co-issue packed instructions by unpacking (PR #151704)

[Akash Dutta via llvm-commits]

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@@ -225,6 +247,313 @@ bool GCNPreRAOptimizationsImpl::processReg(Register Reg) {
   return true;
 }
 
+bool GCNPreRAOptimizationsImpl::isUnpackingSupportedInstr(MachineInstr &MI) const {
+  unsigned Opcode = MI.getOpcode();
+  switch (Opcode) {
+    case AMDGPU::V_PK_ADD_F32:
+    case AMDGPU::V_PK_MUL_F32:
+      return true;
+
+    default:
+      return false;
+
+  }
+}
+
+uint16_t GCNPreRAOptimizationsImpl::mapToUnpackedOpcode(MachineInstr &I) {
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akadutta wrote:

I would like some guidance for that. Not opposed to adding new opcodes.

https://github.com/llvm/llvm-project/pull/151704