[llvm] [RISCV] Use QC_E_ADDI while eliminating the frameindex (PR #139515)

[Sudharsan Veeravalli via llvm-commits]

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@@ -288,6 +288,17 @@ void RISCVRegisterInfo::adjustReg(MachineBasicBlock &MBB,
     return;
   }
 
+  // Use the QC_E_ADDI instruction from the Xqcilia extension that can take a
+  // signed 26-bit immediate. Avoid anything which can be done with a single lui
+  // as it might be compressible.
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svs-quic wrote:

Yeah you're right. Brain fade. I've tried to address this by not using the QC_E_ADDI instruction when both lui and add are compressible.

https://github.com/llvm/llvm-project/pull/139515